KKWGDL • KKWGDLS KAGDL KKWG

Duplex Worms Duplex Worm Wheels Ground Worm Shafts

Reduction Ratio 20~60

Gears
Spur
m 1.5~4 Page 516 m 1.5~4 Page 516 m 0.5~6 Page 522

Worm Gear Pair

Helical
Gears
KAG KAGF KSWG
Worm Wheels Worm Wheels Ground Worms

Reduction Ratio 10~60 Reduction Ratio 10~60 Series

Internal
Gears
m 0.5~1.5 Page 522 m 2~6 Page 526 m 1~6 Page 532

Racks
KAG KSW KBG
Worm Wheels Steel Worms Bronze Worm Wheels

Reduction Ratio 10~60 Series Reduction Ratio 10~60

Catalog Number of Stock Gears

CP Racks
& Pinions
The Catalog Number for KHK stock gears is based on the simple
formula listed below. Please order KHK gears by specifying the
m 1~6 Page 532 m 0.5~6 Page 540 m 0.5~6 Page 540 Catalog Numbers.
(Example) Worm Gear Pair
Worms

Gears
Miter
KCG KSUW KDG
Gray Iron Worm Wheels
Reduction Ratio
10~120
Stainless Steel Worms

Series
Plastic Worm Wheels

Reduction Ratio 10~60

K K W G DL 2 - R1
Hand thread & Number of

Gears
Bevel
Starts (Right hand, Single thread)
Module (2)

m 1~6 Page 542 m 0.5~3 Page 556 m 0.5, 0.8 Page 556 Type (Duplex Worm)
Others (Ground Gear)

Screw
Gears
Type ( Worm)
KPG
Plastic Worm Wheels Material (SCM440)
Reduction Ratio
Material Type
10~50
K SCM440 W Worms

Products Gearboxes Gear Pair

Worm
S S45C DL Duplex Worms
SU SUS303 Other Information
G Ground Gears
m 1~3 Page 558 S Worm Shafts
Worm Wheels
K A G 1.5 - 20 R2
Bevel

Hand thread & Number of starts

(Right hand, Double thread)
Other

Number of teeth (20)

 Feature Icons
Module (1.5)
RoHS Compliant
Stainless Product
Product Type (Worm Wheel)
Re-machinable Material (CAC702)
Resin Product
Product
Material Type
Finished Product Copper Alloy Product A CAC702(*AℓBC2) G Worm Wheels
B CAC502(*PBC2) GDL Duplex Worm Wheels
Injection Molded
Heat Treated Product C FC200
Product
D Polyacetal * ( ) indicates old JIS designation
Black Oxide coated
Ground Gear P MC901
Products
507
 Worm Gear Pair

Characteristics
The simplest way to obtain a large speed reduction with high torque in a compact space is with worm gear drives. KHK stock worms and
worm wheels are available in modules 0.5 to 6 and in speed ratios of 1/10 to 1/120, made in a variety of materials and styles. We also offer
stock duplex worms and worm wheels with which you can obtain a very low backlash, high rotational precision system. The following table
lists the main features for easy selection.

No. of threads Heat

Tooth Precision
Type Catalog No. Module Material surface KHK W 001 Features
or reduction ratio ( ) JIS treatment KHK W 002
finish NOTE 2
Duplex Worms & Worm Wheels

Thermal refined,
Single thread High-precision duplex worms with superior strength. A range of
Worm KKWGDL 2~4 SCM440 gear teeth induc- Ground 1 backlash values can be obtained by moving the worm axially.
tion hardened

Single thread Thermal refined, Duplex worms with a shaft, excellent in accuracy and
Worm KKWGDLS 1.5~4 SCM440 gear teeth induc- Ground 1 strength. A range of backlash values can be obtained by
tion hardened moving the worm axially.
Worm CAC702 Duplex worm wheels made of aluminum bronze, excellent in
Wheel
KAGDL 1.5~4 20~60 — Cut 1 wear-resistance. The pitch accuracy is first grade.
(AℓBC2)
Single thread - Thermal refined, Grounded finished worms with a shaft, including tooth
Worm KKWG 0.5~6 SCM440 gear teeth induc- Ground 2 surface quenching treatment. Allows compact design due to
Double thread tion hardened having small reference diameters.
Worm CAC702 Made of aluminum bronze, have excellent wear-resistance.
Wheel
KAG NOTE 1 0.5~1.5 10~60 — Cut 2 Wide selection is available for this item.
(AℓBC2)
Worm CAC702 Made of aluminum bronze, have excellent wear-resistance.
Wheel
KAGF NOTE 1 2~6 10~60 — Cut 2 Allows compact design.
(AℓBC2)
Gear teeth
Single thread - Reasonably priced ground worms. Ready-to-use finished
Worm KSWG 1~6 S45C induction Ground 2 products from the J Series, are also available.
Triple thread
Worms & Worm Wheels

hardened

Worm CAC702 Made of aluminum bronze, have excellent wear-resistance.

Wheel
KAG NOTE 1 1~6 10~60 — Cut 2 Wide selection is available for this item.
(AℓBC2)
Single thread - Cut Economical, commonly used worms that have broad utility.
Worm KSW 0.5~6 S45C — (Thread 4 Ready-to-use finished products from the J Series are also
Double thread rolled) available.
Single thread - Rust-resistant worms made of stainless steel suitable for
Worm KSUW 0.5~3 SUS303 — Cut 4 mating with KDS or KPG worm wheels. Finished products for
Double thread the J Series are also available.
Worm CAC502 Phosphorous bronze worm wheels have excellent wear
Wheel
KBG 0.5~6 10~60 — Cut 4 resistance. Interchangeable with CG Worm Wheels, and
(PBC2) enhances strength.
Worm Economical, commonly used worm wheels that have broad
Wheel
KCG 1~6 10~120 FC200 — Cut 4 utility. Available with a large selection of modules and number
of teeth.
Worm Fine pitch worm wheels made of polyacetal, a stable
Wheel
KDG 0.5~0.8 10~60 Polyacetal — Cut 5 plastic material.

Worm Light weight and strong MC Nylon worm wheels.

Wheel
KPG 1~3 10~50 MC901 — Cut 5 Suitable for use in food machinery, and can be used
without lubricant.
(NOTE 1) The material of cast hubs for KAGF and KAG worm wheels is FC200(Cast Iron). KAG worm wheels mate primarily with KSWG worms. But, for
Modules 0.8 or smaller, KAG worm wheels mate with KKWG worms.
(NOTE 2) KHK stock worms and worm wheels are produced to KHK’s own precision grades. See the “Precision of Worms and Worm Wheels” in the
“Selection Hints” section.

Our precision gear cutting technology enables acceleration and noise reduction
Setting the proper tooth contact and the backlash is essential for using worm gears. Use KHK stock worm gears for safe, reliable use.

508 Worm Grinding Machine by Klingelnberg Worm gear testing machine by Klingelnberg
 KHK Technical Information

1. Efficiency of Worm Gear Pair  Efficiency of KSWG/KAG Worm Gear Pair ( %)

The efficiency of power transmission varies somewhat with (rpm = Rotation of worm)
the conditions of assembly and lubricant, but is generally Worm rpm
100 300 600 900 1200 1800
Catalog No.
30~90% (excludes losses from bearings and churning of lu-
bricants). The efficiency of KHK stock worm gear pair is given KSWG1-R1 34 40 45 48 51 54
below as a reference. To learn more about strength calcula- KSWG1.5-R1 35 42 47 51 53 57
tion, please refer to the technical information contained in the KSWG2-R1 38 45 51 55 56 61
“Surface Durability of Cylindrical Worm Gearing” section on KSWG2.5-R1 40 48 54 57 60 63
Page 96.
KSWG3-R1 41 49 55 58 62 65
 Efficiency of KWGDLS/KAGDL Worm Gear Pair ( %) KSWG4-R1 42 51 56 61 63 67
(rpm = Rotation of worm) KSWG5-R1 46 54 60 64 66 70
Worm rpm KSWG6-R1 48 57 64 66 68 73
Catalog No.
100 300 600 900 1200 1800
KSWG1-R2 51 56 62 64 67 70
KKWGDL1.5-R1 35 42 47 51 53 57
KSWG1.5-R2 52 59 64 67 69 73
KKWGDL2-R1 38 45 51 55 56 61
KSWG2-R2 55 62 67 70 72 75
KKWGDL2.5-R1 40 48 54 57 60 63
KSWG2.5-R2 57 64 69 72 75 77
KKWGDL3-R1 41 49 55 58 62 65
KSWG3-R2 58 66 71 73 76 78
KKWGDL3.5-R1 42 50 56 61 62 65
KSWG4-R2 59 67 72 75 77 80
KKWGDL4-R1 42 51 56 61 63 67
KSWG5-R2 62 70 75 78 79 82
KSWG6-R2 65 72 77 80 81 84
 Efficiency of KWG/AG, AGF Worm Gear Pair ( %)
KSWG3-R3 67 74 78 80 82 84
(rpm = Rotation of worm)
Worm rpm
KSWG4-R3 68 75 79 82 83 86
Catalog No.
100 300 600 900 1200 1800
KKWG0.5-R1 30 34 38 41 43 46
2. Self-Locking Feature of Worm Gear Pair
KKWG0.8-R1 35 40 44 47 49 53
Self-locking is defined as the inability of worm wheels to drive
KKWG1-R1 34 40 45 48 51 54
the worms. Factors affecting the self-locking feature include the
KKWG1.5-R1 35 42 47 51 53 57 materials of the worm and worm wheel, lead angle, precision of
KKWG2-R1 45 51 56 60 62 65 manufacture, types of bearings, lubricant, etc. Thus, it is not de-
KKWG2.5-R1 44 51 57 61 62 67 pendent simply on the lead angle. But, in general, self-locking will
。
KKWG3-R1 44 52 58 61 64 67 occur when the lead angle in a single thread worm is less than 4.
KKWG4-R1 For systems requiring fail-safe prevention of back drive, we rec-
50 58 64 66 70 72
ommend other braking mechanisms or one-way clutches.
KKWG5-R1 51 60 66 69 71 73
KKWG6-R1 53 61 66 70 72 75
KKWG0.5-R2 46 50 54 58 60 63
KKWG0.8-R2 51 56 61 64 66 69
KKWG1-R2 51 56 62 64 67 70
KKWG1.5-R2 52 59 64 67 69 73
KKWG2-R2 61 67 71 74 76 78
KKWG2.5-R2 60 67 72 75 76 80
KKWG3-R2 61 68 73 75 78 80
KKWG4-R2 66 73 77 79 82 84

 Efficiency of KSW, KSUM / KCG, KBG, KPG Worm Gear Pair ( %)

The efficiency is approximately as follows, depending on the
assembly, loading, lubrication and rotational speed.

Catalog No. Thread Efficiency(%)

Single thread 40~50%

KSW/KSUW
Double thread 50~60%
509
 Worm Gear Pair

Selection Hints
Please select the most suitable products by carefully considering the characteristics of items and contents of the product tables. It is
also important to read all applicable “CAUTION” notes shown below before the final selection. Use of catalog numbers when order-
ing will simplify and expedite the processing of your order.
1. Caution in Selecting the Mating Gears  The Helixes of Worms and Worm Wheels
Worms and worm wheels have either right-hand or left-hand helix. The
RH single thread LH single thread
same hand worms and worm wheels comprise sets. However, the
number of threads and whether they use normal module or axial module
system must also be matched. The table below shows available combi-
nations of KHK stock worms and worm wheels.
 Mating Worm Wheels Selection Chart
KKWGDL
Worm KKWGDLS
KKWG KSWG KSW KSUW

Helix/ R1 R1 R2 R1 R2 R3 R1 R2 L1 L2 R1 R2
Mating Worm Wheel NOTE 1 Thread
KAGDL R1 
KAG0.5~1.5 R1 
KAGF R2 
R1 
KAG R2 
R3 
R1  
R2  
KBG
L1 
L2 
R1  
R2  
KCG
L1 
L2 
R1  
KPG
R2  
R1  
KDG
R2  
(NOTE 1) Select the same module for both members.
RH double thread LH double thread

2. Caution in Selecting Gears Based on Gear Strength

The gear strength values shown in the product pages were compute by assuming a certain application environment as shown below. Therefore, they
should be used as reference only. We recommend that each user computes their own values by applying the actual usage conditions.
 Calculation assumptions for Surface Durability  Calculation assumptions for Bending Strength
Catalog No. KKWGDL
KKWGDLS/KAGDL KSW/KBG KSW/KCG KSUW/KPG KSUW/KDG
Item KKWG/KAGF, KSWG/KAG
Formula NOTE 2 Formula of worm gear's strength (JGMA405-01) The Lewis formula
Rotations of worm 600rpm 100rpm Allowable bending stress(kgf/mm2)
Lubricant Lubricant for gears with proper viscosity and with anti-pressure additives
Lubrication Oil bath NOTE 3

Starting condition Starting torque less than 200% of rated torque. Less than 2 starts per hour 1.15 1
Durability 26000 hours (40OC with No (40OC with No
Impact from motor Uniform load Lubrication) Lubrication)
Impact from load Uniform load
Allowable stress factor Sclim 0.67 0.70 0.42
(NOTE 2)The gear strength formula is based on JGMA (Japanese Gear Manufacturer’s Association) specifications and “MC Nylon Technical Data” by
Nippon Polypenco Limited. The units for the rotational speed (rpm) and the stress (kgf/mm2) are adjusted to the units needed in the formula.
(NOTE 3)Allowable bending stress of KDG worm wheel is the value we estimated.

 The Maximum Allowable Sliding Speed Due to Heat

The maximum allowable sliding speed for each series of Catalog No. Max. Sliding Speed (m/s)
worm wheels is given on the right. Select the appropriate
KAGDL * 15
part by calculating the sliding speed.
KAGF * 15
ν
Sliding speed s (m/s) KAG * 15
KBG * 10
d : Worm pitch dia. KCG
dn * 2.5
νs = n : Worm speed (rpm) KPG 1 (no lubrication)
19100 cos γ
510 γ : Worm nominal lead angle * JGMA405-01
 KHK Technical Information

3. Selecting Worms and Worm Wheels by Precision

The precision standards of KHK stock worms and worm
wheels are established by us. The table below indicates the
tolerance ranges for our products.

a Precision of worms (KHK W 001) c Overall Length Tolerance of Worms

KHK established allowable profile and lead errors of worms with  Overall Length Tolerance of Worms
precision grades 1 to 4, by using the JIS Standard as reference.
Lead errors are measured over one full revolution. Series Total length(mm) Tolerance
0
 Precision Grades of Worms (KHK W 001) (Unit: μm) KKWGDL Uniform
-0.10
Module
0
KSWG Less than 100
Grade

Error over over over over over -0.15

m 0.4 m 1up m 1.6 m 2.5 m4 KSW
up to1 to 1.6 up to 2.5 up to 4 up to 6 KSUW Over 100
0
-0.20
Tooth profile error 8 12 16 20 25
1
Lead error 7 9 11 13 16 KKWGDLS
KKWG
Uniform Normal tolerance
Tooth profile error 12 16 20 24 29
2
Lead error 15 18 21 25 28
 Overall Length Tolerance of Worms Wheels
Tooth profile erro 16 23 30 37 50
3
Lead error 20 23 27 33 37
Total length (mm) Tolerance
Tooth profile error 20 30 40 50 70
4
Lead error 30 32 38 46 52 0
below 30
-0.10
b Precision of worm wheels (KHK W 002)
0
We have established standard grades 1 to 5 of worm wheels over 30 up to 100
-0.15
using the JIS Standard as reference. The allowable values
of Single Pitch Error and Runout Error are defined for each 0
over 100
-0.20
module size and pitch diameter.
(CAUTION) KPG Plastic Wheels are excluded.

 Precision Grades of Worm Wheels (KHK W 002) Unit : μm

Over m0.4 up to 1 Over m1 up to 1.6 Over m1.6 up to 2.5 Over m2.5 up to 4 Over m4 up to 6
Pitch diameter (mm)
6 up to 12

12 up to 25

25 up to 50

50 up to 100

100 up to 200

12 up to 25

25 up to 50

50 up to 100

100 up to 200

200 up to 400

12 up to 25

25 up to 50

50 up to 100

100 up to 200

200 up to 400

25 up to 50

50 up to 100

100 up to 200

200 up to 400

400 up to 800

25 up to 50

50 up to 100

100 up to 200

200 up to 400

400 up to 800
Grade

Error

Single pitch error 5 6 7 7 9 6 7 8 9 10 7 7 8 9 11 8 9 10 11 13 9 10 11 13 14

1
Total composite error 21 24 26 30 34 25 28 31 35 41 27 30 33 37 43 33 36 40 46 53 37 40 45 50 57
Single pitch error 8 8 9 10 12 9 10 11 12 14 9 10 12 13 15 11 13 14 16 18 13 14 16 18 20
2
Total composite error 30 33 37 42 48 35 39 44 50 57 38 42 46 52 60 46 51 57 64 74 52 57 63 71 80
Single pitch error 11 12 13 15 17 12 14 16 18 20 13 15 16 19 21 16 18 20 23 26 19 20 22 25 29
3
Total composite error 43 47 53 60 68 50 55 62 71 81 53 59 66 74 85 65 72 81 91 105 74 81 90 100 115
Single pitch error 15 17 19 21 24 18 19 22 25 29 19 21 23 26 30 23 25 28 32 37 26 28 32 35 40
4
Total composite error 60 66 74 83 95 70 77 87 99 115 75 83 92 105 120 91 100 115 130 145 105 115 125 140 160
Single pitch error 21 24 26 30 34 25 28 31 35 41 27 30 33 37 43 33 36 40 46 53 37 40 45 50 57
5
Total composite error 86 94 105 120 135 100 110 125 140 165 105 120 130 150 170 130 145 160 185 210 150 160 180 200 230

511
 Worm Gear Pair

Application Hints 2. Points of Caution in Assembling

a KHK stock worms and worm wheels are designed such that
In order to use KHK stock worms and worm wheels safely, care- when assembled according to the specified Mounting distance with a tol-
fully read the Application Hints before proceeding. If there are erance of H7 to H8, the backlash shown in the product tables is
questions or you require clarifications, please contact our techni- obtained. Do not attempt to eliminate backlash by pushing worms
cal department or your nearest distributor. into worm wheels or operate with the worm shifted in the direc-
tion along the tooth.
QTC METRIC GEARS b The figure below shows the datum clamp face of a worm wheel.
PHONE: (516) 437-6700 FAX: (516) 328-3343 When assembling worm gears, be sure that the worm axis is in
E-mail qtcsupport@qtcgears.com the center of the worm wheel face width.

Datum Clamp Face

1. Caution on Performing Secondary Operations
a If you are reboring, it is important to pay special attention to
A
locating the center in order to avoid runout. (Fig.1) The reference A
datum for gear cutting or grinding is the bore. (For worm shafts, A
it is ground portion of the shaft.) Therefore, use the bore or shaft
for locating the center. If it is too difficult to do for small bores, the
alternative is to use one spot on the bore and the runout of the
side surface. Hub - one side Hub - both sides Ring geometry

c Because of the helix of the gear teeth, worms and worm wheels
Lathe Operation produce axial thrust forces. The directions of thrust depend on the
hand of the helix and the direction of rotation. This is illustrated be-
low in Fig.2. The bearings must be selected properly to be able to
handle these thrust forces. See the “Gear Forces” section in the
technical reference for more details (Page 107).

Direction of rotation and thrust force

R helical

Driver Thrust bearing

Driver

If chucking operation using scroll chucks is to L helical

be done, we recommend the use of new or
rebored jaws for improved precision.
Fig.1

b To open up the bore to its maximum, calculate the bore size

Driver Thrust bearing Driver
so that the tooth strength is weaker than the strength of the
remaining material.
For machining the maximum bore diameter, it should be designed
so that the thickness between hub diameter (or root diameter)
to bore diameter has more strength than the gear strength. As a
guide, the maximum machined bore diameter should be within
60% to 70% of the hub diameter (or root diameter). When the
Fig.2
keyway is processed, it should be 50% to 60%. In the case FC
material is used, it should be lower by 10% or more.
c Since worm wheels are molded products, they may have air d Because large thrust forces act on worms, if they are not se-
bubbles inside the material. In case you find air bubbles inside cured to the shaft firmly, they tend to shift. Use of step shafts, set
when performing secondary operations, and if the bubbles are screws, dowel pins, etc., are recommended. Also, check for loos-
512 found to be troublesome, please contact your KHK distributor. ening of bearings due to thrust forces.
 KHK Technical Information

3. Verifying the orientation of assembly

How well the worms and worm wheels are assembled has large effects on the friction of the unit. The tooth contact at the time of
assembly must be checked for correctness as shown below. See the “Tooth Contact of a Worm Gear Pair” section in the techni-
cal reference for more details (Page 67).
• Verify that the worm axis is perpendicular to the worm • Check that the worm axis is in the center of the worm wheel
wheel axis. face width.

Good Bad Good Bad

Error
Error Error
Error

• Check the Mounting distance (allowable Mounting distance H7~H8). • Confirm that the center of the worm wheel goes through
the midpoint of the worm length.

Good Bad Good Bad

Error Error

The worm cannot rotate correctly if the worm wheel

is engaged close to either end of its length.
RH LH RH LH

Application Examples

KSW Worms and KCG Worm Wheels used in a rotating comb device KSW Worms and KBG Worm Wheels used in adjusting a cloth feeding device

513
 KKWGDL • KKWGDLS & KAGDL
Gears Duplex Worm Gears

Description of duplex worm gears

Spur

The usual method of adjusting the backlash of a worm gear assembly

is to modify the center distance. Once assembled, such adjustment
requires a major rework of the gearbox housing. The use of duplex
Helical
Gears

worm gears allows the backlash adjustment to be made by axially

shifting the worm. This simplifies greatly the assembly and mainte-
nance operations. Because of the unique characteristics of the prod-
Internal

uct, please take time to study its construction and proper use.
Gears

 Backlash adjustment mechanism and method of adjustment

Racks

The dual-lead worm is formed to give a difference between the right tooth surface and left
tooth surface so that it provides a unique tooth profile in which the tooth thickness varies
continuously, corresponding with the lead difference. (Fig.1)
CP Racks
& Pinions

The worm gear is also formed in its right and left tooth surface.
An arrow marking on the outer circumference of the hub of the
When such a worm and worm gear are set up at a constant assembly distance and the
KHK duplex worm indicates the direction of assembly as well as
worm is moved in the axial direction, the tooth thickness of the worm in mesh with the acts as a guide for the backlash adjustment.
worm gear changes making backlash adjustment possible. When the worm is held with arrow mark pointing right, the tooth
thickness is thinner on the right and thicker on the left. Therefore,
moving the worm to the right causes the thicker teeth to come
Gears
Miter

into actual engagement with the worm gear, thereby reducing the
(a tooth surface pitch) (b tooth surface pitch)
backlash. (Fig.2)
Gears
Bevel

b tooth surface a tooth surface

(Nominal surface)
Screw
Gears

Fig.1
(CAUTION)The amount of change in backlash (△j mm) in relation to the axial movement of the duplex
Products Gearboxes Gear Pair

worm shaft (V mm) can be calculated from the formula below.

Worm

m b-m a Reference tooth

Δ j=2V Moving the worm in the direction of the
m a+m b arrow causes the backlash to decrease.

Where Fig. 2
m a = Nominal Axial Module - (0.01× Nominal Axial Module)
Bevel

(CAUTION) The KHK duplex worm is designed so that, for all

m b = Nominal Axial Module + (0.01× Nominal Axial Module) modules, the backlash reduces by 0.02 mm when
the worm is shifted 1 mm.

 Application Examples
Other

Adjusting Screw Adjusting Shim

Adjustment by using Screws * Adjustment by using Shims *

514 * The illustration above is a design example, not a design for machinery or a device in actual use.
 KKWGDL • KKWGDLS & KAGDL

Duplex Worm Gears

Gears
Point of caution during assembly

Spur


KHK duplex worm gears differs in module between the right and left
tooth surface and, therefore, you must orient the worm and worm wheel
properly. Please carefully verify the following two aspects before proceed-

Helical
Gears
ing with assembly.
1. Verifying the orientation of assembly
An arrow indicating the orientation of assembly is stamped on both the duplex worm and worm wheel. When assembling the

Internal
worm and worm wheel, check the worm wheel of the arrow mark on the front such that the direction of arrow mark on the worm

Gears
coincides with that on the worm wheel. Should the assembly be incorrect, the center distance “a” will become larger than the
normal distance, resulting in difficulty of assembly and improper gear engagement. (Fig.3)

Racks
CP Racks
& Pinions
Gears
Miter
Gears
Bevel
Screw
Gears
Products Gearboxes Gear Pair
Arrow mark indicates the correct orientation of two gears when assembled. As shown, the two arrows must point in the same direction.

Worm
Fig. 3
2. Verifying the reference position
A V-groove (60°, 0.3 mm deep line) on tip peripheral of the duplex worm tooth marks the reference tooth. The gear set is designated to
have a backlash of nearly zero (±0.045) when the reference tooth is positioned in alignment with the center of rotation of the worm wheel Bevel
with the center distance set at the value "a". (Fig.4)
Other

Reference tooth
Center distance

Center distance

Reference tooth

Fig. 4 515
 KKWGDL • KKWGDLS Module 1.5, 2
Duplex Worms
Specifications
Precision grade KHK W 001 grade 1 R
Gears
Spur

Reference P Q
Axial

G
section of gear S

G
G G
Gear teeth Standard full depth G
Normal
pressure angle 17° 30'
Helical

Material SCM440
Gears

Vmax G

M
N
O
L
Heat treatment Thermal refined, tooth surface
induction hardened
Tooth hardness 50~60HRC
W4
Internal
Gears

Nominal axial Number of Nominal Bore Hub dia. Pitch dia. Outside dia. Face width Hub width Total length
Catalog No. module starts lead angle
Hand thread Shape
LH7 M N O P Q R
KKWGDL2-R1 m2 1 3°41' R W4 14 25 31 35 36 14 50

Total length Shaft length (L) Neck length (L) Face width Neck length (R) Shaft length (R) Pitch dia.
Racks

Nominal axial Number of Nominal

Catalog No. module starts lead angle
Hand thread Shape
J K L M N O P
KKWGDLS1.5-R1 m1.5 1 3°26' R W6 190 66 12 28 18 66 25
KKWGDLS2-R1 m2 1 3°41' R W6 220 75 13 36 21 75 31
CP Racks

[Caution on Product Characteristics] a When the center distance is moved to reduce the backlash, the V max is the maximum amount of distance that you may shift without
& Pinions

causing problems with the gear mesh. The V max is not a recommended value to use for adjustment when assembling.
b These worms produce axial thrust forces. See page 512 for more details.

 For products not categorized in our Stock Gear series', custom gear
Gears

production services with short lead times is available. For details see page VI.
Miter

KAGDL Module 1.5, 2

Duplex Worm Wheels
Gears
Bevel

G
Specifications E F
Precision grade KHK W 002 grade 1
Reference
Screw
Gears

section of gear Rotating plane

Gear teeth Standard full depth
J

Normal
pressure angle 17° 30'
CAC702 (formerly JIS AℓBC2) D’
Material
D
A
B
C
Products Gearboxes Gear Pair

—
Worm

Heat treatment

Tooth hardness —
H1

Reduction Nominal axial No. of Bore Hub dia. Pitch dia. Throat dia. Outside dia. Face width Hub width
Catalog No. ratio module teeth
Helix angle Hand thread Shape
AH7 B C D D' E F
Bevel

KAGDL1.5-20R1 20 20 3°26' R H1 8 22 30 33 34.5 14 10

KAGDL1.5-30R1 30 30 3°26' R H1 10 30 45 48 49.5 14 10
KAGDL1.5-36R1 36 36 3°26' R H1 10 35 54 57 58.5 14 10
m1.5
KAGDL1.5-40R1 40 40 3°26' R H1 12 35 60 63 64.5 14 10
KAGDL1.5-50R1 50 50 3°26' R H1 12 45 75 78 79.5 14 10
Other

KAGDL1.5-60R1 60 60 3°26' R H1 12 50 90 93 94.5 14 10

KAGDL2-20R1 20 20 3°41' R H1 12 33 40 44 46 18 15
KAGDL2-30R1 30 30 3°41' R H1 15 40 60 64 66 18 15
KAGDL2-36R1 36 36 3°41' R H1 15 45 72 76 78 18 15
m2
KAGDL2-40R1 40 40 3°41' R H1 15 45 80 84 86 18 15
KAGDL2-50R1 50 50 3°41' R H1 15 50 100 104 106 18 15
KAGDL2-60R1 60 60 3°41' R H1 15 60 120 124 126 18 15

[Caution on Product Characteristics] a The allowable torques shown in the table are the calculated values according to the assumed usage conditions. Please see
page 510 for more details.
b Duplex worms and worm wheels must be mated in a predetermined orientation, which is indicated by the arrows. Therefore,
the arrow on the wheel does not indicate the mounting direction, but the rotating direction. Please refer to the Application
516 Hints on page 515.
 KKWGDL • KKWGDLS

Duplex Worms

Gears
J

Spur
K L M N O
T
G G G
G

Q
S

Helical
Gears
Vmax

W6

Internal
Gears
Position of
reference tooth Max. allowable shift Weight
Catalog No.
S Vmax (kg)

22 8 0.21 KKWGDL2-R1

Position of
Outside dia. Neck dia. Shaft dia. Max. allowable shift Weight

Racks
reference tooth
Catalog No.
Q R S T Vmax (kg)

28 21 26.2 17 6 0.74 KKWGDLS1.5-R1

35 24 30.2 22 8 1.17 KKWGDLS2-R1

CP Racks
[Caution on Secondary Operations] a Please read “Caution on Performing Secondary Operations” (Page 512) when per-

& Pinions
forming modifications and/or secondary operations for safety concerns.
b Due to the gear teeth being induction hardened, no secondary operations can be
performed on tooth areas including the bottom land (approx. 1 to 2 mm).

Gears
Miter
KAGDL

Gears
Bevel
Duplex Worm Wheels

Screw
Gears
Products Gearboxes Gear Pair
Worm
NOTE 1 : Allowable torque for worm revolution (rpm)

Total length Web thickness Web O.D. Mounting distance Allowable torque (N·m) NOTE 1 Backlash Weight
Catalog No.
G (H) (I) J 30 rpm 100 rpm 300 rpm 600 rpm 900 rpm 1200 rpm 1800 rpm (mm) (kg) Bevel
24 — — 27.5 9.84 8.18 6.40 5.30 4.68 4.25 3.68 0±0.045 0.10 KAGDL1.5-20R1
24 — — 35 20.8 17.5 13.9 11.7 10.4 9.40 8.28 0±0.045 0.22 KAGDL1.5-30R1
24 — — 39.5 29.3 24.6 19.8 16.8 14.9 13.5 11.9 0±0.045 0.32 KAGDL1.5-36R1
24 — — 42.5 35.6 30.0 24.2 20.6 18.3 16.6 14.6 0±0.045 0.37 KAGDL1.5-40R1
24 — — 50 53.8 45.4 36.9 31.6 28.3 25.8 22.6 0±0.045 0.59 KAGDL1.5-50R1
Other

24 — — 57.5 75.3 63.8 51.9 44.7 40.4 36.7 32.4 0±0.045 0.83 KAGDL1.5-60R1

33 — — 35.5 21.0 17.5 13.6 11.2 9.84 8.94 7.75 0±0.045 0.26 KAGDL2-20R1
33 — — 45.5 44.3 37.3 29.6 24.8 21.9 19.8 17.4 0±0.045 0.51 KAGDL2-30R1
33 — — 51.5 62.3 52.6 42.0 35.5 31.3 28.4 25.0 0±0.045 0.73 KAGDL2-36R1
33 — — 55.5 75.8 64.0 51.4 43.6 38.5 34.9 30.7 0±0.045 0.86 KAGDL2-40R1
33 — — 65.5 115 96.8 78.4 66.9 59.5 54.2 47.6 0±0.045 1.30 KAGDL2-50R1
33 — — 75.5 160 136 110 94.6 84.9 77.2 68.1 0±0.045 1.88 KAGDL2-60R1

[Caution on Secondary Operations] a Please read “Caution on Performing Secondary Operations” (Page 512) when performing modifications and/or secondary
operations for safety concerns.

517
 KKWGDL • KKWGDLS Module 2.5, 3
Duplex Worms
Specifications
R
Gears

Precision grade KHK W 001 grade 1

Spur

Reference P Q
Axial

G
section of gear S

G
G G
Gear teeth Standard full depth G
Normal
pressure angle 17° 30'
Helical

Material SCM440
Gears

Vmax G

M
N
O
L
Heat treatment Thermal refined, tooth surface
induction hardened
Tooth hardness 50~60HRC
W4
Internal
Gears

Nominal axial Number of Nominal Bore Hub dia. Pitch dia. Outside dia. Face width Hub width Total length
Catalog No. module starts lead angle
Hand thread Shape
LH7 M N O P Q R
KKWGDL2.5-R1 m2.5 1 3°52' R W4 18 30 37 42 48 17 65
KKWGDL3-R1 m3 1 3°54' R W4 20 35 44 50 54 20 74
Racks

Nominal axial Number of Nominal Total length Shaft length (L) Neck length (L) Face width Neck length (R) Shaft length (R) Pitch dia.
Catalog No. module starts lead angle
Hand thread Shape
J K L M N O P
KKWGDLS2.5-R1 m2.5 1 3°52' R W6 260 85 16 48 26 85 37
KKWGDLS3-R1 m3 1 3°54' R W6 300 100 18 54 28 100 44
CP Racks
& Pinions

[Caution on Product Characteristics] a When the center distance is moved to reduce the backlash, the V max is the maximum amount of distance that you may shift without
causing problems with the gear mesh. The V max is not a recommended value to use for adjustment when assembling.
b These worms produce axial thrust forces. See page 512 for more details.

 For products not categorized in our Stock Gear series', custom gear
Gears
Miter

production services with short lead times is available. For details see page VI.

KAGDL Module 2.5, 3

Duplex Worm Wheels
Gears
Bevel

G
Specifications E F
Precision grade KHK W 002 grade 1
Screw

Reference
Gears

section of gear Rotating plane

Gear teeth Standard full depth
J

Normal
pressure angle 17° 30'
Material CAC702 (formerly JIS AℓBC2) D’
D
A
B
C
Products Gearboxes Gear Pair
Worm

Heat treatment —
Tooth hardness —
H1

Reduction Nominal axial No. of Bore Hub dia. Pitch dia. Throat dia. Outside dia. Face width Hub width
Catalog No. ratio module teeth
Helix angle Hand thread Shape
AH7 B C D D' E F
Bevel

KAGDL2.5-20R1 20 20 3°52' R H1 15 40 50 55 57.5 22 15

KAGDL2.5-30R1 30 30 3°52' R H1 15 40 75 80 82.5 22 15
KAGDL2.5-36R1 36 36 3°52' R H1 15 45 90 95 97.5 22 15
m2.5
KAGDL2.5-40R1 40 40 3°52' R HB 15 45 100 105 107.5 22 15
KAGDL2.5-50R1 50 50 3°52' R HB 15 60 125 130 132.5 22 15
Other

KAGDL2.5-60R1 60 60 3°52' R HB 15 80 150 155 157.5 22 15

KAGDL3-20R1 20 20 3°54' R H1 20 50 60 66 69 28 17
KAGDL3-30R1 30 30 3°54' R H1 20 55 90 96 99 28 17
KAGDL3-36R1 36 36 3°54' R H1 20 60 108 114 117 28 17
m3
KAGDL3-40R1 40 40 3°54' R HB 20 60 120 126 129 28 17
KAGDL3-50R1 50 50 3°54' R HB 20 70 150 156 159 28 17
KAGDL3-60R1 60 60 3°54' R HB 20 80 180 186 189 28 17

[Caution on Product Characteristics] a The allowable torques shown in the table are the calculated values according to the assumed usage conditions. Please see
page 510 for more details.
b Duplex worms and worm wheels must be mated in a predetermined orientation, which is indicated by the arrows. Therefore,
the arrow on the wheel does not indicate the mounting direction, but the rotating direction. Please refer to the Application
518 Hints on page 515.
 KKWGDL • KKWGDLS

Duplex Worms

Gears
J

Spur
K L M N O
T
G G G
G

Q
S

Helical
Gears
Vmax

W6

Internal
Gears
Position of
reference tooth Max. allowable shift Weight
Catalog No.
S Vmax (kg)

29 10 0.37 KWGDL2.5-R1
32 10 0.61 KWGDL3-R1

Racks
Position of
Outside dia. Neck dia. Shaft dia. reference tooth Max. allowable shift Weight
Catalog No.
Q R S T Vmax (kg)

42 30 36.2 29 10 2.00 KWGDLS2.5-R1

50 34 40.2 32 10 2.95 KWGDLS3-R1

CP Racks
& Pinions
[Caution on Secondary Operations] a Please read “Caution on Performing Secondary Operations” (Page 512) when per-
forming modifications and/or secondary operations for safety concerns.
b Due to the gear teeth being induction hardened, no secondary operations can be
performed on tooth areas including the bottom land (approx. 1 to 2 mm).

Gears
Miter
KAGDL

Gears
Bevel
Duplex Worm Wheels
G
E F

Screw
Gears
J

(H)
D’
D
A
B
C
(I)

Products Gearboxes Gear Pair

CS

Worm
CS

HB
*CS has a sand mold casting finish. NOTE 1 : Allowable torque for worm revolution (rpm)
Total length Web thickness Web O.D. Mounting distance Allowable torque (N·m) NOTE 1 Backlash Weight
Catalog No.
G (H) (I) J 30 rpm 100 rpm 300 rpm 600 rpm 900 rpm 1200 rpm 1800 rpm (mm) (kg) Bevel
37 — — 43.5 38.1 31.4 24.5 20.1 17.6 16.0 13.8 0±0.045 0.45 KAGDL2.5-20R1
37 — — 56 80.5 67.1 53.1 44.5 39.1 35.5 30.9 0±0.045 0.88 KAGDL2.5-30R1
37 — — 63.5 113 94.5 75.5 63.8 56.0 51.0 44.3 0±0.045 1.25 KAGDL2.5-36R1
37 (10) (86) 68.5 138 115 92.4 78.3 68.8 62.7 54.4 0±0.045 1.14 KAGDL2.5-40R1
37 (12) (108) 81 208 174 141 120 106 97.3 84.3 0±0.045 1.93 KAGDL2.5-50R1
Other

37 (12) (133) 93.5 291 245 198 170 152 139 121 0±0.045 2.90 KAGDL2.5-60R1

45 — — 52 65.0 53.3 41.5 33.8 29.5 26.9 22.8 0±0.045 0.81 KAGDL3-20R1
45 — — 67 137 114 90.0 74.7 65.5 59.5 51.2 0±0.045 1.65 KAGDL3-30R1
45 — — 76 193 160 128 107 93.8 85.6 73.4 0±0.045 2.32 KAGDL3-36R1
45 (14) (106) 82 235 195 157 131 115 105 90.1 0±0.045 2.19 KAGDL3-40R1
45 (14) (134) 97 355 295 239 202 178 163 140 0±0.045 3.26 KAGDL3-50R1
45 (14) (164) 112 497 415 336 285 254 233 200 0±0.045 4.48 KAGDL3-60R1

[Caution on Secondary Operations] a Please read “Caution on Performing Secondary Operations” (Page 512) when performing modifications and/or secondary
operations for safety concerns.

519
 KKWGDL • KKWGDLS Module 3.5, 4
Duplex Worms
Specifications
R
Gears

Precision grade KHK W 001 grade 1

Spur

Reference P Q
Axial

G
section of gear S

G
G G
Gear teeth Standard full depth G
Normal
pressure angle 17° 30'
Helical

Material SCM440
Gears

Vmax G

M
N
O
L
Heat treatment Thermal refined, tooth surface
induction hardened
Tooth hardness 50~60HRC
W4
Internal
Gears

Nominal axial Number of Nominal Bore Hub dia. Pitch dia. Outside dia. Face width Hub width Total length
Catalog No. module starts lead angle
Hand thread Shape
LH7 M N O P Q R
KKWGDL3.5-R1 m3.5 1 3°47' R W4 24 44 53 60 62 23 85
KKWGDL4-R1 m4 1 3°41' R W4 28 50 62 70 74 26 100
Racks

Nominal axial Number of Nominal Total length Shaft length (L) Neck length (L) Face width Neck length (R) Shaft length (R) Pitch dia.
Catalog No. module starts lead angle
Hand thread Shape
J K L M N O P
KKWGDLS3.5-R1 m3.5 1 3°47' R W6 330 110 18 62 30 110 53
KKWGDLS4-R1 m4 1 3°41' R W6 360 120 16 74 30 120 62
CP Racks
& Pinions

[Caution on Product Characteristics] a When the center distance is moved to reduce the backlash, the V max is the maximum amount of distance that you may shift without
causing problems with the gear mesh. The V max is not a recommended value to use for adjustment when assembling.
b These worms produce axial thrust forces. See page 512 for more details.

 For products not categorized in our Stock Gear series', custom gear
Gears
Miter

production services with short lead times is available. For details see page VI.

KAGDL Module 3.5, 4

Duplex Worm Wheels
Gears
Bevel

G
Specifications E F
Precision grade KHK W 002 grade 1
Reference
Screw
Gears

section of gear Rotating plane

Gear teeth Standard full depth
J

Normal
pressure angle 17° 30'
Material CAC702 (formerly JIS AℓBC2)* D’
D
A
B
C
Products Gearboxes Gear Pair

—
Worm

Heat treatment

Tooth hardness —
H1
*H5 shape have a hub made from S45C cast iron.

Reduction Nominal axial No. of Bore Hub dia. Pitch dia. Throat dia. Outside dia. Face width Hub width
Catalog No. ratio module teeth
Helix angle Hand thread Shape
AH7 B C D D' E F
Bevel

KAGDL3.5-20R1 20 20 3°47' R H1 20 55 70 77 80.5 32 18

KAGDL3.5-30R1 30 30 3°47' R H1 20 60 105 112 115.5 32 18
KAGDL3.5-36R1 36 36 3°47' R H1 20 70 126 133 136.5 32 18
m3.5
KAGDL3.5-40R1 40 40 3°47' R HB 20 70 140 147 150.5 32 18
KAGDL3.5-50R1 50 50 3°47' R HB 20 80 175 182 185.5 32 18
Other

KAGDL3.5-60R1 60 60 3°47' R HB 20 90 210 217 220.5 32 18

KAGDL4-20R1 20 20 3°41' R H1 20 60 80 88 92 35 20
KAGDL4-30R1 30 30 3°41' R HB 20 65 120 128 132 35 20
KAGDL4-36R1 36 36 3°41' R HB 20 75 144 152 156 35 20
m4
KAGDL4-40R1 40 40 3°41' R HB 20 75 160 168 172 35 20
KAGDL4-50R1 50 50 3°41' R HB 20 90 200 208 212 35 20
KAGDL4-60R1 60 60 3°41' R H5 30 120 240 248 252 35 20

[Caution on Product Characteristics] a The allowable torques shown in the table are the calculated values according to the assumed usage conditions. Please see
page 510 for more details.
b Duplex worms and worm wheels must be mated in a predetermined orientation, which is indicated by the arrows. Therefore,
the arrow on the wheel does not indicate the mounting direction, but the rotating direction. Please refer to the Application
520 Hints on page 515.
 KWGDL • KWGDLS

Duplex Worms

Gears
J

Spur
K L M N O
T
G G G
G

Q
S

Helical
Gears
Vmax

W6

Internal
Gears
Position of
reference tooth Max. allowable shift Weight
Catalog No.
S Vmax (kg)

37 12 1.05 KKWGDL3.5-R1
44 14 1.67 KKWGDL4-R1

Racks
Position of
Outside dia. Neck dia. Shaft dia. reference tooth Max. allowable shift Weight
Catalog No.
Q R S T Vmax (kg)

60 42 48.2 37 12 4.72 KKWGDLS3.5-R1

70 50 56.2 44 14 7.10 KKWGDLS4-R1

CP Racks
& Pinions
[Caution on Secondary Operations] a Please read “Caution on Performing Secondary Operations” (Page 512) when performing modifications and/or secondary operations
for safety concerns.
b Due to the gear teeth being induction hardened, no secondary operations can be performed on tooth areas including the bottom land
(approx. 1 to 2 mm).

Gears
Miter
KAGDL

Gears
Bevel
Duplex Worm Wheels
G G
E F E F

Screw
Gears
(H)
J
J

(H)
D’
D’

D
A
B
C
D
A
B
C

(I)
(I)

Products Gearboxes Gear Pair

CS

Worm
CS

HB H5
*CS has a sand mold casting finish. NOTE 1 : Allowable torque for worm revolution (rpm)
Total length Web thickness Web O.D. Mounting distance Allowable torque (N·m) NOTE 1 Backlash Weight
Catalog No.
G (H) (I) J 30 rpm 100 rpm 300 rpm 600 rpm 900 rpm 1200 rpm 1800 rpm (mm) (kg) Bevel
50 — — 61.5 98.5 80.4 62.5 50.4 44.2 40.0 33.7 0±0.045 1.24 KAGDL3.5-20R1
50 — — 79 208 172 136 111 98.1 88.3 75.7 0±0.045 2.51 KAGDL3.5-30R1
50 — — 89.5 293 242 193 160 141 127 109 0±0.045 3.61 KAGDL3.5-36R1
50 (15) (124) 96.5 356 295 236 196 173 156 133 0±0.045 3.34 KAGDL3.5-40R1
50 (16) (155) 114 538 446 360 301 267 243 207 0±0.045 5.02 KAGDL3.5-50R1
Other

50 (16) (189) 131.5 753 627 506 425 381 345 296 0±0.045 6.87 KAGDL3.5-60R1

55 — — 71 134 109 84.8 67.9 59.7 53.4 44.8 0±0.045 1.76 KAGDL4-20R1
55 (17) (99) 91 284 234 184 150 132 118 101 0±0.045 3.01 KAGDL4-30R1
55 (17) (121) 103 400 329 262 215 190 170 144 0±0.045 4.18 KAGDL4-36R1
55 (17) (137) 111 486 400 320 264 233 208 177 0±0.045 4.78 KAGDL4-40R1
55 (17) (177) 131 735 605 488 405 361 324 275 0±0.045 7.07 KAGDL4-50R1
55 (17) (200) 151 1030 851 687 572 515 461 393 0±0.045 11.5 KAGDL4-60R1

[Caution on Secondary Operations] a Please read “Caution on Performing Secondary Operations” (Page 512) when performing modifications and/or secondary
operations for safety concerns.

521
 KKWG Module 0.5, 0.8
Ground Worm Shafts
Specifications
Precision grade KHK W 001 grade 2
Gears
Spur

Reference
section of gear Axial J
K M O
Gear teeth Standard full depth G
G
Normal G G
pressure angle 20°
Helical

SCM440

Q
Material

S
Gears

Heat treatment Thermal refined, tooth surface

induction hardened
Tooth hardness 50~60HRC
W5
Internal
Gears

Axial Number of Total length Shaft length (L) Neck length (L) Face width Neck length (R) Shaft length (R) Pitch dia.
Catalog No. module starts
Lead angle Hand thread Shape
J K L M N O P
KKWG0.5-R1 1 3°11' R W5 65 19 — 12 — 34 9
m0.5
KKWG0.5-R2 2 6°20' R W5 65 19 — 12 — 34 9
KKWG0.8-R1 1 3°49' R W5 85 25 — 20 — 40 12
m0.8
Racks

KKWG0.8-R2 2 7°36' R W5 85 25 — 20 — 40 12
[Caution on Product Characteristics] a These worms produce axial thrust forces. See page 512 for more details.
CP Racks
& Pinions

 For products not categorized in our Stock Gear series', custom gear
production services with short lead times is available. For details see page VI.
Gears
Miter

KAG Module 0.5, 0.8

Worm Wheels
Gears
Bevel

Specifications
G
Precision grade KHK W 002 grade 2 E F
Reference
section of gear Rotating plane
Screw
Gears

Gear teeth Standard full depth

J

Normal
pressure angle 20°
D’
A
B
C
Material CAC702 (formerly JIS AℓBC2)
Heat treatment —
Products Gearboxes Gear Pair
Worm

Tooth hardness —
HA

Reduction Transverse No. of Number of Bore Hub dia. Pitch dia. Throat dia. Outside dia. Face width
Catalog No. ratio module teeth starts
Helix angle Hand thread Shape
AH7 B C D D' E
KAG0.5-20R1 20 20 1 3°11' R HA 4 9 10 — 11 5
Bevel

KAG0.5-20R2 10 20 2 6°20' R HA 4 9 10 — 11 5
KAG0.5-30R1 30 30 1 3°11' R HA 4 12 15 — 16 5
KAG0.5-30R2 15 m0.5 30 2 6°20' R HA 4 12 15 — 16 5
KAG0.5-40R1 40 40 1 3°11' R HA 5 15 20 — 21 5
Other

KAG0.5-50R1 50 50 1 3°11' R HA 5 20 25 — 26 5
KAG0.5-60R1 60 60 1 3°11' R HA 5 25 30 — 31 5
KAG0.8-20R1 20 20 1 3°49' R HA 5 12 16 — 17.6 8
KAG0.8-20R2 10 20 2 7°36' R HA 5 12 16 — 17.6 8
KAG0.8-30R1 30 30 1 3°49' R HA 5 18 24 — 25.6 8
KAG0.8-30R2 15 m0.8 30 2 7°36' R HA 5 18 24 — 25.6 8
KAG0.8-40R1 40 40 1 3°49' R HA 6 20 32 — 33.6 8
KAG0.8-50R1 50 50 1 3°49' R HA 8 25 40 — 41.6 8
KAG0.8-60R1 60 60 1 3°49' R HA 8 25 48 — 49.6 8
[Caution on Product Characteristics] a The allowable torques shown in the table are the calculated values according to the assumed usage conditions.
Please see page 510 for more details.

522
 KKWG

Ground Worm Shafts

Gears
Spur
Helical
Gears
Internal
Gears
Outside dia. Neck dia. Shaft dia. Weight
Catalog No.
Q R Sh7 (kg)

10 — 6 0.018 KKWG0.5-R1
10 — 6 0.018 KKWG0.5-R2
13.6 — 8 0.043 KKWG0.8-R1

Racks
13.6 — 8 0.043 KKWG0.8-R2
[Caution on Secondary Operations] a Please read “Caution on Performing Secondary Operations” (Page 512) when performing modifications and/or sec-
ondary operations for safety concerns.
b Due to the gear teeth being induction hardened, no secondary operations can be performed on tooth areas including the bottom land

CP Racks
& Pinions
(approx. 1 to 2 mm). Use carbide tools for the modification of the shaft area near the bottom land.

Gears
Miter
KAGDL

Worm Wheels

Gears
Bevel
Screw
Gears
Products Gearboxes Gear Pair
Worm
NOTE 1 : Allowable torque for worm revolution (rpm)
Hub width Total length Web thickness Web O.D. Mounting distance Allowable torque (N·m) NOTE 1 Backlash Weight
Catalog No.
F G (H) (I) J 30 rpm 100 rpm 300 rpm 600 rpm 900 rpm 1200 rpm 1800 rpm (mm) (kg)

7 12 — — 9.5 0.52 0.44 0.36 0.30 0.26 0.24 0.21 0.02~0.14 0.0056 KAG0.5-20R1
Bevel
7 12 — — 9.5 0.51 0.42 0.33 0.27 0.24 0.22 0.19 0.02~0.14 0.0056 KAG0.5-20R2
7 12 — — 12 1.09 0.94 0.77 0.65 0.58 0.53 0.48 0.02~0.14 0.012 KAG0.5-30R1
7 12 — — 12 1.09 0.92 0.73 0.60 0.54 0.49 0.43 0.02~0.14 0.012 KAG0.5-30R2
7 12 — — 14.5 1.86 1.60 1.34 1.15 1.02 0.94 0.84 0.02~0.14 0.020 KAG0.5-40R1
7 12 — — 17 2.82 2.42 2.05 1.77 1.58 1.46 1.30 0.02~0.14 0.035 KAG0.5-50R1
Other

7 12 — — 19.5 3.94 3.41 2.89 2.50 2.26 2.08 1.87 0.02~0.14 0.053 KAG0.5-60R1
8 16 — — 14 1.78 1.50 1.21 1.00 0.88 0.82 0.71 0.06~0.17 0.018 KAG0.8-20R1
8 16 — — 14 1.76 1.44 1.11 0.91 0.80 0.74 0.63 0.06~0.17 0.018 KAG0.8-20R2
8 16 — — 18 3.77 3.21 2.62 2.20 1.96 1.81 1.61 0.06~0.17 0.043 KAG0.8-30R1
8 16 — — 18 3.75 3.14 2.46 2.02 1.80 1.65 1.45 0.06~0.17 0.043 KAG0.8-30R2
8 16 — — 22 6.45 5.49 4.55 3.87 3.46 3.19 2.83 0.06~0.17 0.068 KAG0.8-40R1
8 16 — — 26 9.75 8.31 6.94 5.94 5.34 4.96 4.38 0.06~0.17 0.10 KAG0.8-50R1
8 16 — — 30 13.6 11.7 9.77 8.39 7.63 7.05 6.27 0.06~0.17 0.14 KAG0.8-60R1
[Caution on Secondary Operations] a Please read “Caution on Performing Secondary Operations” (Page 512) when performing modifications
and/or secondary operations for safety concerns.

523
 KKWG Module 1, 1.5
Ground Worm Shafts
Specifications
Gears

Precision grade KHK W 001 grade 2

Spur

Reference
section of gear Axial J
K L M N O
Gear teeth Standard full depth
G G G G
Normal
pressure angle 20°
Helical

Material SCM440

Q
P
S

S
Gears

Heat treatment Thermal refined, tooth surface

induction hardened
Tooth hardness 50~60HRC
W6
Internal
Gears

Axial Number of Total length Shaft length (L) Neck length (L) Face width Neck length (R) Shaft length (R) Pitch dia.
Catalog No. module starts
Lead angle Hand thread Shape
J K L M N O P
KKWG1-R1 1 3°35' R W6 140 35 10 30 10 55 16
m1
KKWG1-R2 2 7°08' R W6 140 35 10 30 10 55 16
KKWG1.5-R1 1 3°26' R W6 190 50 15 40 15 70 25
m1.5
Racks

KKWG1.5-R2 2 6°51' R W6 190 50 15 40 15 70 25

[Caution on Product Characteristics] a These worms produce axial thrust forces. See page 512 for more details.
CP Racks
& Pinions

 For products not categorized in our Stock Gear series', custom gear
production services with short lead times is available. For details see page VI.
Gears
Miter

KAG Module 1, 1.5

Worm Wheels
Gears
Bevel

G
Specifications E F
Precision grade KHK W 002 grade 2
Reference
section of gear Rotating plane
Screw
Gears

Gear teeth Standard full depth

J

Normal
pressure angle 20°

D’
Material CAC702 (formerly JIS AℓBC2)
D
A
B
C

Heat treatment —
Products Gearboxes Gear Pair
Worm

Tooth hardness —
H1

Reduction Transverse No. of Number of Bore Hub dia. Pitch dia. Throat dia. Outside dia. Face width
Catalog No. ratio module teeth starts
Helix angle Hand thread Shape
AH7 B C D D' E
KAG1-20R1 20 20 1 3°35' R H1 6 16 20 22 23 10
Bevel

KAG1-20R2 10 20 2 7°08' R H1 6 16 20 22 23 10
KAG1-30R1 30 30 1 3°35' R H1 6 20 30 32 33 10
KAG1-30R2 15 m1 30 2 7°08' R H1 6 20 30 32 33 10
KAG1-40R1 40 40 1 3°35' R H1 8 26 40 42 43 10
KAG1-50R1 50 50 1 3°35' R H1 8 30 50 52 53 10
Other

KAG1-60R1 60 60 1 3°35' R H1 10 35 60 62 63 10
KAG1.5-20R1 20 20 1 3°26' R H1 8 22 30 33 34.5 14
KAG1.5-20R2 10 20 2 6°51' R H1 8 22 30 33 34.5 14
KAG1.5-30R1 30 30 1 3°26' R H1 10 30 45 48 49.5 14
KAG1.5-30R2 15 m1.5 30 2 6°51' R H1 10 30 45 48 49.5 14
KAG1.5-40R1 40 40 1 3°26' R H1 12 35 60 63 64.5 14
KAG1.5-50R1 50 50 1 3°26' R H1 12 45 75 78 79.5 14
KAG1.5-60R1 60 60 1 3°26' R H1 12 50 90 93 94.5 14
[Caution on Product Characteristics] a The allowable torques shown in the table are the calculated values according to the assumed usage conditions.
Please see page 510 for more details.

524
 KKWG

Ground Worm Shafts

Gears
Spur
Helical
Gears
Internal
Gears
Outside dia. Neck dia. Shaft dia. Weight
Catalog No.
Q R S (kg)

18 13 18.2 0.25 KKWG1-R1

18 13 18.2 0.25 KKWG1-R2
28 21 26.2 0.74 KKWG1.5-R1

Racks
28 21 26.2 0.74 KKWG1.5-R2
[Caution on Secondary Operations] a Please read “Caution on Performing Secondary Operations” (Page 512) when performing modifications and/or secondary operations for safety
concerns.
b Due to the gear teeth being induction hardened, no secondary operations can be performed on tooth areas including the bottom land (approx.

CP Racks
& Pinions
1 to 2 mm). Use carbide tools for the modification of the shaft area near the bottom land.

Gears
Miter
KAG

Worm Wheels

Gears
Bevel
Screw
Gears
Products Gearboxes Gear Pair
Worm
NOTE 1 : Allowable torque for worm revolution (rpm)
Hub width Total length Web thickness Web O.D. Mounting distance Allowable torque (N·m) NOTE 1 Backlash Weight
Catalog No.
F G (H) (I) J 30 rpm 100 rpm 300 rpm 600 rpm 900 rpm 1200 rpm 1800 rpm (mm) (kg)

10 20 — — 18 3.35 2.79 2.23 1.83 1.63 1.50 1.30 0.08~0.19 0.038 KAG1-20R1 Bevel
10 20 — — 18 3.31 2.69 2.06 1.68 1.48 1.35 1.15 0.08~0.19 0.038 KAG1-20R2
10 20 — — 23 7.08 5.98 4.84 4.05 3.63 3.31 2.92 0.08~0.19 0.078 KAG1-30R1
10 20 — — 23 7.03 5.84 4.56 3.72 3.33 3.03 2.63 0.08~0.19 0.078 KAG1-30R2
10 20 — — 28 12.1 10.2 8.43 7.12 6.38 5.86 5.13 0.08~0.19 0.13 KAG1-40R1
10 20 — — 33 18.3 15.5 12.9 10.9 9.87 9.09 7.95 0.08~0.19 0.20 KAG1-50R1
Other

10 20 — — 38 25.6 21.8 18.1 15.4 14.1 12.9 11.4 0.08~0.19 0.29 KAG1-60R1
10 24 — — 27.5 9.84 8.18 6.40 5.30 4.68 4.25 3.68 0.10~0.21 0.10 KAG1.5-20R1
10 24 — — 27.5 9.72 7.87 5.92 4.87 4.25 3.83 3.27 0.10~0.21 0.10 KAG1.5-20R2
10 24 — — 35 20.8 17.5 13.9 11.7 10.4 9.40 8.28 0.10~0.21 0.22 KAG1.5-30R1
10 24 — — 35 20.7 17.1 13.1 10.8 9.56 8.58 7.46 0.10~0.21 0.22 KAG1.5-30R2
10 24 — — 42.5 35.6 30.0 24.2 20.6 18.3 16.6 14.6 0.10~0.21 0.37 KAG1.5-40R1
10 24 — — 50 53.8 45.4 36.9 31.6 28.3 25.8 22.6 0.10~0.21 0.59 KAG1.5-50R1
10 24 — — 57.5 75.3 63.8 51.9 44.7 40.4 36.7 32.4 0.10~0.21 0.83 KAG1.5-60R1
[Caution on Secondary Operations] a Please read “Caution on Performing Secondary Operations” (Page 512) when performing modifications
and/or secondary operations for safety concerns.

525
 KKWG Module 2, 2.5
Ground Worm Shafts
Specifications
Gears

Precision grade KHK W 001 grade 2

Spur

Reference
section of gear Axial J
K L M N O
Gear teeth Standard full depth
G G G G
Normal
pressure angle 20°
Helical

Material SCM440

Q
P
S

S
Gears

Heat treatment Thermal refined, tooth surface

induction hardened
Tooth hardness 50~60HRC
W6
Internal

Axial Number of Total length Shaft length (L) Neck length (L) Face width Neck length (R) Shaft length (R) Pitch dia.
Gears

Catalog No. module starts

Lead angle Hand thread Shape
J K L M N O P
KKWG2-R1 1 5°12' R W6 200 35 25 40 25 75 22
m2
KKWG2-R2 2 10°18' R W6 200 35 25 40 25 75 22
KKWG2.5-R1 1 4°46' R W6 250 50 27 46 27 100 30
m2.5
KKWG2.5-R2 2 9°28' R W6 250 50 27 46 27 100 30
Racks

[Caution on Product Characteristics] a These worms produce axial thrust forces. See page 512 for more details.
CP Racks
& Pinions

KAGF Module 2, 2.5

Worm Wheels
Gears

Specifications
Miter

G
Precision grade KHK W 002 grade 2 F’ E F
Reference
section of gear Rotating plane
Gear teeth Standard full depth

J
Normal
pressure angle 20°
Gears
Bevel

D’
D
A
B
C
Material CAC702 (formerly JIS AℓBC2)*
Heat treatment —
Tooth hardness —
*H8, H9 shape have a hub made from FC200 cast iron.
H6
Screw
Gears

Reduction Transverse No. of Number Profile shift Helix Hand Bore Hub dia. Pitch dia. Throat dia. Outside dia. Face width Hub width(R)
Catalog No. ratio module teeth of starts coefficient angle thread
Shape
AH7 B C D D' E F
KAGF2-20R1 20 20 1 −0.5 5°12' R H6 12 32 40 42 44 18 12
KAGF2-20R2 10 20 2 −0.5 10°18' R H6 12 32 40 42 44 18 12
Products Gearboxes Gear Pair
Worm

KAGF2-25R1 25 25 1 −0.5 5°12' R H6 12 35 50 52 54 18 12

KAGF2-30R1 30 30 1 −0.5 5°12' R H6 12 38 60 62 64 18 12
KAGF2-30R2 15 30 2 −0.5 10°18' R H6 12 38 60 62 64 18 12
m2
KAGF2-36R1 36 36 1 0 5°12' R H6 12 40 72 76 78 18 12
KAGF2-40R1 40 40 1 −0.5 5°12' R H8 12 45 80 82 84 18 12
KAGF2-48R1 48 48 1 +0.5 5°12' R H9 12 50 96 102 104 18 12
Bevel

KAGF2-50R1 50 50 1 −0.5 5°12' R H9 12 50 100 102 104 18 12

KAGF2-60R1 60 60 1 −0.5 5°12' R H9 12 50 120 122 124 18 12
KAGF2.5-20R1 20 20 1 0 4°46' R H6 12 35 50 55 57.5 20 15
KAGF2.5-20R2 10 20 2 0 9°28' R H6 12 35 50 55 57.5 20 15
KAGF2.5-25R1 25 25 1 0 4°46' R H6 12 40 62.5 67.5 70 20 15
Other

KAGF2.5-30R1 30 30 1 0 4°46' R H6 12 40 75 80 82.5 20 15

KAGF2.5-30R2 15 30 2 0 9°28' R H6 12 40 75 80 82.5 20 15
m2.5
KAGF2.5-36R1 36 36 1 0 4°46' R H8 12 45 90 95 97.5 20 15
KAGF2.5-40R1 40 40 1 0 4°46' R H9 12 45 100 105 107.5 20 15
KAGF2.5-48R1 48 48 1 0 4°46' R H9 12 50 120 125 127.5 20 15
KAGF2.5-50R1 50 50 1 0 4°46' R H9 12 55 125 130 132.5 20 15
KAGF2.5-60R1 60 60 1 0 4°46' R H9 12 60 150 155 157.5 20 15
[Caution on Product Characteristics] a The allowable torques shown in the table are the calculated values according to the assumed usage conditions.
Please see page 510 for more details.
b There may be space in the casting between the two materials, but it will not affect the joint strength.

526
 KKWG

Ground Worm Shafts

Gears
Spur
 For products not categorized in our Stock Gear series', custom gear
production services with short lead times is available. For details see page VI.

Helical
Gears
Internal
Outside dia. Neck dia. Shaft dia. Weight

Gears
Catalog No.
Q R S (kg)

26 17 25.2 0.64 KKWG2-R1

26 17 25.2 0.64 KKWG2-R2
35 23 30.2 1.27 KKWG2.5-R1
35 23 30.2 1.27 KKWG2.5-R2

Racks
[Caution on Secondary Operations] a Please read “Caution on Performing Secondary Operations” (Page 512) when performing modifications and/or secondary operations for safety
concerns.
b Due to the gear teeth being induction hardened, no secondary operations can be performed on tooth areas including the bottom land (approx.
1 to 2 mm). Use carbide tools for the modification of the shaft area near the bottom land.

CP Racks
& Pinions
KAG

Worm Wheels
G G
F’ E F F’ E F

Gears
Miter
(H)
J
J

D’
D’

Gears
Bevel
D
A
B
C
D
A
B
C

(I)
CS

CS

H8 H9
*CS has a sand mold casting finish.

Screw
Gears
NOTE 1 : Allowable torque for worm revolution (rpm)
Hub width Total length Web thickness Web O.D. Mounting distance Allowable torque (N·m) NOTE 1 Backlash Weight
Catalog No.
F G (H) (I) J 30 rpm 100 rpm 300 rpm 600 rpm 900 rpm 1200 rpm 1800 rpm (mm) (kg)

5 35 — — 30 19.4 16.1 12.8 10.5 9.30 8.49 7.31 0.11~0.24 0.25 KAGF2-20R1

Products Gearboxes Gear Pair

5 35 — — 30 19.9 16.1 12.2 9.99 8.75 7.92 6.74 0.11~0.24 0.25 KAGF2-20R2

Worm
5 35 — — 35 29.4 24.5 19.6 16.3 14.4 13.2 11.4 0.11~0.24 0.37 KAGF2-25R1
5 35 — — 40 41.1 34.5 27.7 23.2 20.7 18.8 16.4 0.11~0.24 0.51 KAGF2-30R1
5 35 — — 40 42.3 35.0 27.0 22.1 19.9 17.7 15.4 0.11~0.24 0.51 KAGF2-30R2
5 35 — — 47 57.8 48.6 39.3 33.2 29.6 27.0 23.6 0.11~0.24 0.73 KAGF2-36R1
5 35 — — 50 70.3 59.2 48.1 40.7 36.4 33.2 28.9 0.11~0.24 0.85 KAGF2-40R1
5 35 (10) (76) 60 98.5 83.0 68.0 57.9 51.9 47.5 41.3 0.11~0.24 1.14 KAGF2-48R1
Bevel
5 35 (12) (81) 60 106 89.5 73.4 62.5 56.2 51.5 44.9 0.11~0.24 1.14 KAGF2-50R1
5 35 (12) (96) 70 149 126 103 88.4 80.3 73.3 64.2 0.11~0.24 1.51 KAGF2-60R1
5 40 — — 40 35.1 29.0 22.6 18.6 16.3 14.8 12.8 0.14~0.27 0.44 KAGF2.5-20R1
5 40 — — 40 34.6 27.9 20.9 17.1 14.8 13.4 11.3 0.14~0.27 0.44 KAGF2.5-20R2
5 40 — — 46.25 53.0 43.9 34.8 28.9 25.3 23.0 20.0 0.14~0.27 0.66 KAGF2.5-25R1
Other

5 40 — — 52.5 74.1 62.0 49.1 41.2 36.7 32.8 28.7 0.14~0.27 0.87 KAGF2.5-30R1
5 40 — — 52.5 73.6 60.6 46.2 37.8 33.2 29.9 25.8 0.14~0.27 0.87 KAGF2.5-30R2
5 40 — — 60 104 87.4 69.8 59.0 51.8 47.1 41.2 0.14~0.27 1.19 KAGF2.5-36R1
5 40 (12) (80) 65 127 106 85.4 72.4 63.7 57.9 50.5 0.14~0.27 1.23 KAGF2.5-40R1
5 40 (13) (97) 75 178 149 121 103 90.8 83.1 72.2 0.14~0.27 1.72 KAGF2.5-48R1
5 40 (13) (100) 77.5 192 161 130 111 98.4 90.0 78.3 0.14~0.27 1.92 KAGF2.5-50R1
5 40 (13) (125) 90 268 226 183 157 141 128 112 0.14~0.27 2.59 KAGF2.5-60R1
[Caution on Secondary Operations] a Please read “Caution on Performing Secondary Operations” (Page 512) when performing modifications and/or secondary
operations for safety concerns.
b The tooth and the hub areas, fastened by casting, are designed to have higher hardness than other
parts of the gear. However, please avoid areas other than the hub. Also, the strength may decrease
if secondary operations are performed.
527
 KKWG Module 3, 4
Ground Worm Shafts
Specifications
Precision grade KHK W 001 grade 2
Gears
Spur

Reference
section of gear Axial J
K L M N O
Gear teeth Standard full depth
G G G G
Normal
pressure angle 20°
Helical

Material SCM440

Q
P
S

S
Gears

Heat treatment Thermal refined, tooth surface

induction hardened
Tooth hardness 50~60HRC
W6
Internal
Gears

Axial Number of Total length Shaft length (L) Neck length (L) Face width Neck length (R) Shaft length (R) Pitch dia.
Catalog No. module starts
Lead angle Hand thread Shape
J K L M N O P
KKWG3-R1 1 4°31' R W6 300 55 30 60 30 125 38
m3
KKWG3-R2 2 8°58' R W6 300 55 30 60 30 125 38
KKWG4-R1 1 5°43' R W6 360 70 32.5 75 32.5 150 40
m4
Racks

KKWG4-R2 2 11°19' R W6 360 70 32.5 75 32.5 150 40

[Caution on Product Characteristics] a These worms produce axial thrust forces. See page 512 for more details.
CP Racks
& Pinions

KAGF Module 3, 4
Worm Wheels
Specifications
Gears
Miter

G
Precision grade KHK W 002 grade 2 F’ E F
Reference
section of gear Rotating plane
Gear teeth Standard full depth

J
Normal
pressure angle 20°

D’
Gears
Bevel

D
A
B
C
Material CAC702 (formerly JIS AℓBC2)*
Heat treatment —
Tooth hardness —
*H8, H9 shape have a hub made from FC200 cast iron.
H6
Screw
Gears

Reduction Transverse No. of Number Profile shift Helix Hand Bore Hub dia. Pitch dia. Throat dia. Outside dia. Face width Hub width(R)
Catalog No. ratio module teeth of starts coefficient angle thread
Shape
AH7 B C D D' E F
KAGF3-20R1 20 20 1 +0.333 4°31' R H6 20 50 60 68 71 25 17.5
KAGF3-20R2 10 20 2 +0.333 8°58' R H6 20 50 60 68 71 25 17.5
Products Gearboxes Gear Pair

KAGF3-25R1 25 25 1 0 4°31' R H6 20 55 75 81 84 25 17.5

Worm

KAGF3-30R1 30 30 1 +0.333 4°31' R H8 20 55 90 98 101 25 17.5

KAGF3-30R2 15 30 2 +0.333 8°58' R H8 20 55 90 98 101 25 17.5
m3
KAGF3-36R1 36 36 1 +0.333 4°31' R H8 20 60 108 116 119 25 17.5
KAGF3-40R1 40 40 1 +0.333 4°31' R H9 20 65 120 128 131 25 17.5
KAGF3-48R1 48 48 1 +0.333 4°31' R H9 20 70 144 152 155 25 17.5
Bevel

KAGF3-50R1 50 50 1 +0.333 4°31' R H9 20 75 150 158 161 25 17.5

KAGF3-60R1 60 60 1 +0.333 4°31' R H9 20 80 180 188 191 25 17.5
KAGF4-20R1 20 20 1 0 5°43' R H6 20 60 80 88 92 30 20
KAGF4-20R2 10 20 2 0 11°19' R H6 20 60 80 88 92 30 20
KAGF4-25R1 25 25 1 0 5°43' R H6 20 65 100 108 112 30 20
KAGF4-30R1 30 30 1 0 5°43' R H8 20 65 120 128 132 30 20
Other

KAGF4-30R2 15 30 2 0 11°19' R H8 20 65 120 128 132 30 20

m4
KAGF4-36R1 36 36 1 0 5°43' R H9 20 70 144 152 156 30 20
KAGF4-40R1 40 40 1 0 5°43' R H9 20 80 160 168 172 30 20
KAGF4-48R1 48 48 1 0 5°43' R H9 20 90 192 200 204 30 20
KAGF4-50R1 50 50 1 0 5°43' R H9 20 90 200 208 212 30 20
KAGF4-60R1 60 60 1 0 5°43' R H0 160 — 240 248 252 30 7
[Caution on Product Characteristics] a The allowable torques shown in the table are the calculated values according to the assumed usage conditions.
Please see page 510 for more details.
b There may be space in the casting between the two materials, but it will not affect the joint strength.

528
 KKWG

Ground Worm Shafts

Gears
Spur
 For products not categorized in our Stock Gear series', custom gear

Helical
production services with short lead times is available. For details see page VI.

Gears
Internal
Gears
Outside dia. Neck dia. Shaft dia. Weight
Catalog No.
Q R S (kg)

44 30 40.2 2.66 KKWG3-R1

44 30 40.2 2.66 KKWG3-R2
48 29 45.2 3.85 KKWG4-R1

Racks
48 29 45.2 3.85 KKWG4-R2
[Caution on Secondary Operations] a Please read “Caution on Performing Secondary Operations” (Page 512) when performing modifications and/or secondary operations for
safety concerns.
b Due to the gear teeth being induction hardened, no secondary operations can be performed on tooth areas including the bottom land

CP Racks
& Pinions
(approx. 1 to 2 mm). Use carbide tools for the modification of the shaft area near the bottom land.
KAGF

Worm Wheels
G G E
F’ E F F’ E F F H F’

Gears
Miter
(H)
J

J
J

D’

D’
D’

D
A
B
C

Gears
D
A
C

Bevel
D
A
B
C

(I)

I
CS

CS

H8 H9 H0
*CS has a sand mold casting finish.

Screw
Gears
NOTE 1 : Allowable torque for worm revolution (rpm)
Hub width Total length Web thickness Web O.D. Mounting distance Allowable torque (N·m) NOTE 1 Backlash Weight
Catalog No.
F G (H) (I) J 30 rpm 100 rpm 300 rpm 600 rpm 900 rpm 1200 rpm 1800 rpm (mm) (kg)

7.5 50 — — 50 59.7 49.1 38.3 31.5 27.5 25.1 21.5 0.16~0.29 0.88 KAGF3-20R1
7.5 50 — — 50 60.2 48.2 36.1 29.5 25.4 23.0 19.4 0.16~0.29 0.88 KAGF3-20R2

Products Gearboxes Gear Pair

7.5 50 — — 56.5 90.2 74.3 58.8 48.9 42.6 39.0 33.5 0.16~0.29 1.24 KAGF3-25R1

Worm
7.5 50 — — 65 126 105 83.1 69.6 61.0 55.4 48.2 0.16~0.29 1.63 KAGF3-30R1
7.5 50 — — 65 128 105 79.8 65.2 57.2 51.6 44.3 0.16~0.29 1.63 KAGF3-30R2
7.5 50 — — 74 178 148 118 99.7 87.5 79.4 69.1 0.16~0.29 2.25 KAGF3-36R1
7.5 50 (16) (95) 80 216 180 145 122 108 98.0 84.9 0.16~0.29 2.52 KAGF3-40R1
7.5 50 (15) (120) 92 303 252 204 174 153 141 121 0.16~0.29 3.28 KAGF3-48R1 Bevel
7.5 50 (15) (125) 95 326 272 220 188 166 152 132 0.16~0.29 3.62 KAGF3-50R1
7.5 50 (15) (155) 110 457 383 310 265 237 217 188 0.16~0.29 4.76 KAGF3-60R1
10 60 — — 60 123 101 78.8 64.6 56.3 51.5 43.8 0.19~0.32 1.77 KAGF4-20R1
10 60 — — 60 127 101 76.0 61.9 53.2 48.3 40.5 0.19~0.32 1.77 KAGF4-20R2
10 60 — — 70 186 153 121 100 87.3 79.9 68.5 0.19~0.32 2.56 KAGF4-25R1
Other

10 60 — — 80 260 216 171 143 125 114 98.4 0.19~0.32 3.28 KAGF4-30R1
10 60 — — 80 270 220 168 137 120 108 92.2 0.19~0.32 3.28 KAGF4-30R2
10 60 (20) (113) 92 366 304 243 204 179 164 141 0.19~0.32 4.10 KAGF4-36R1
10 60 (23) (128) 100 445 370 297 251 220 201 173 0.19~0.32 5.25 KAGF4-40R1
10 60 (20) (160) 116 624 519 420 356 314 288 248 0.19~0.32 6.95 KAGF4-48R1
10 60 (20) (168) 120 673 560 454 385 340 312 269 0.19~0.32 7.35 KAGF4-50R1
15 30 8 204 140 941 788 638 544 486 444 385 0.19~0.32 3.60 KAGF4-60R1
[Caution on Secondary Operations] a Please read “Caution on Performing Secondary Operations” (Page 512) when performing modifications and/or secondary
operations for safety concerns.
b The tooth and the hub areas, fastened by casting, are designed to have higher hardness than other
parts of the gear. However, please avoid areas other than the hub. Also, the strength may decrease
if secondary operations are performed.
529
 KKWG Module 5, 6
Ground Worm Shafts
Specifications
Precision grade KHK W 001 grade 2
Gears
Spur

Reference
section of gear Axial J
K L M N O
Gear teeth Standard full depth
G G G G
Normal
pressure angle 20°
Helical

Material SCM440

Q
P
S

S
Gears

Heat treatment Thermal refined, tooth surface

induction hardened
Tooth hardness 50~60HRC
W6
Internal
Gears

Axial Number of Total length Shaft length (L) Neck length (L) Face width Neck length (R) Shaft length (R) Pitch dia.
Catalog No. module starts
Lead angle Hand thread Shape
J K L M N O P
KKWG5-R1 m5 1 5°43' R W6 400 75 30 90 30 175 50
KKWG6-R1 m6 1 5°43' R W6 400 60 40 100 40 160 60
[Caution on Product Characteristics] a These worms produce axial thrust forces. See page 512 for more details.
Racks
CP Racks
& Pinions

KAGF Module 5, 6
Worm Wheels
Gears
Miter

G
Specifications
F’ E F
Precision grade KHK W 002 grade 2
Gears
Bevel

Reference
section of gear Rotating plane J

Gear teeth Standard full depth

D’
Normal

D
A
B
C
pressure angle 20°
Material CAC702 (formerly JIS AℓBC2)*
Screw
Gears

Heat treatment —
Tooth hardness — H6
*H8, H9 shape have a hub made from FC200 cast iron.
Products Gearboxes Gear Pair

Reduction Transverse No. of Number Profile shift Helix Hand Bore Hub dia. Pitch dia. Throat dia. Outside dia. Face width Hub width(R)
Catalog No.
Worm

Shape
ratio module teeth of starts coefficient angle thread AH7 B C D D' E F
KAGF5-20R1 20 20 1 0 5°43' R H6 22 75 100 110 115 35 23
KAGF5-25R1 25 25 1 0 5°43' R H6 22 75 125 135 140 35 23
KAGF5-30R1 30 30 1 0 5°43' R H9 22 75 150 160 165 35 23
KAGF5-36R1 36 36 1 0 5°43' R H9 22 90 180 190 195 35 23
m5
KAGF5-40R1 40 40 1 0 5°43' R H9 22 110 200 210 215 35 23
Bevel

KAGF5-48R1 48 48 1 0 5°43' R H0 140 — 240 250 255 35 7.5

KAGF5-50R1 50 50 1 0 5°43' R H0 150 — 250 260 265 35 7.5
KAGF5-60R1 60 60 1 0 5°43' R H0 200 — 300 310 315 35 7.5
KAGF6-20R1 20 20 1 0 5°43' R H6 25 85 120 132 138 40 23
KAGF6-25R1 25 25 1 0 5°43' R H6 25 90 150 162 168 40 23
Other

KAGF6-30R1 30 30 1 0 5°43' R H9 25 100 180 192 198 40 23

KAGF6-36R1 36 36 1 0 5°43' R H9 25 110 216 228 234 40 23
m6
KAGF6-40R1 40 40 1 0 5°43' R H0 130 — 240 252 258 40 8
KAGF6-48R1 48 48 1 0 5°43' R H0 180 — 288 300 306 40 8
KAGF6-50R1 50 50 1 0 5°43' R H0 190 — 300 312 318 40 8
KAGF6-60R1 60 60 1 0 5°43' R H0 250 — 360 372 378 40 8
[Caution on Product Characteristics] a The allowable torques shown in the table are the calculated values according to the assumed usage conditions.
Please see page 510 for more details.
b There may be space in the casting between the two materials, but it will not affect the joint strength.
c For H0-shaped products with a bore size of Ø190 or more, the bore tolerance is H8.

530
 KKWG

Ground Worm Shafts

Gears
Spur
 For products not categorized in our Stock Gear series', custom gear

Helical
production services with short lead times is available. For details see page VI.

Gears
Internal
Gears
Outside dia. Neck dia. Shaft dia. Weight
Catalog No.
Q R S (kg)

60 36 50.2 5.75 KKWG5-R1

72 44 60.2 8.09 KKWG6-R1
[Caution on Secondary Operations] a Please read “Caution on Performing Secondary Operations” (Page 512) when performing modifications and/or secondary operations

Racks
for safety concerns.
b Due to the gear teeth being induction hardened, no secondary operations can be performed on tooth areas including the bottom land
(approx. 1 to 2 mm). Use carbide tools for the modification of the shaft area near the bottom land.

CP Racks
& Pinions
KAGF

Gears
Miter
Worm Wheels
G E
F’ E F F H F’

Gears
Bevel
(H)
J

J
D’

D’
D
A
B
C

D
A
C
(I)

I
CS

Screw
Gears
CS

H9 H0
*CS has a sand mold casting finish.
NOTE 1 : Allowable torque for worm revolution (rpm)

Products Gearboxes Gear Pair

Hub width (L) Total length Web thickness Web O.D. Mounting distance Allowable torque (N·m) NOTE 1 Backlash Weight
Catalog No.

Worm
F' G (H) (I) J 30 rpm 100 rpm 300 rpm 600 rpm 900 rpm 1200 rpm 1800 rpm (mm) (kg)

12 70 — — 75 211 172 134 108 95.0 86.2 72.7 0.22~0.35 3.26 KAGF5-20R1
12 70 — — 87.5 319 261 206 168 147 134 114 0.22~0.35 4.48 KAGF5-25R1
12 70 (25) (115) 100 446 369 291 239 211 191 164 0.22~0.35 5.37 KAGF5-30R1
12 70 (25) (140) 115 627 519 414 343 302 274 234 0.22~0.35 7.70 KAGF5-36R1
12 70 (26) (162) 125 763 632 506 421 371 337 288 0.22~0.35 9.97 KAGF5-40R1
Bevel
17.5 35 10 195 145 1070 886 715 598 530 483 411 0.22~0.35 5.04 KAGF5-48R1
17.5 35 10 205 150 1150 956 772 646 574 523 446 0.22~0.35 5.28 KAGF5-50R1
17.5 35 10 255 175 1610 1340 1090 913 820 744 639 0.22~0.35 6.48 KAGF5-60R1
12 75 — — 90 329 268 208 167 146 131 110 0.24~0.37 4.95 KAGF6-20R1
Other

12 75 — — 105 497 405 319 259 227 204 173 0.24~0.37 7.14 KAGF6-25R1
12 75 (30) (135) 120 696 572 451 368 325 290 248 0.24~0.37 9.21 KAGF6-30R1
12 75 (30) (172) 138 978 806 641 528 466 417 355 0.24~0.37 12.5 KAGF6-36R1
20 40 12 190 150 1190 981 784 648 572 513 436 0.24~0.37 6.20 KAGF6-40R1
20 40 12 240 174 1670 1380 1110 920 816 735 628 0.24~0.37 7.58 KAGF6-48R1
20 40 12 250 180 1800 1480 1200 994 885 796 676 0.24~0.37 8.00 KAGF6-50R1
20 40 12 310 210 2520 2090 1680 1410 1260 1130 969 0.24~0.37 10.0 KAGF6-60R1
[Caution on Secondary Operations] a Please read “Caution on Performing Secondary Operations” (Page 512) when performing modifications and/or secondary
operations for safety concerns.
b The tooth and the hub areas, fastened by casting, are designed to have higher hardness than other
parts of the gear. However, please avoid areas other than the hub. Also, the strength may decrease if
secondary operations are performed.
531
 KSWG Module 1, 1.5
Ground Worms
Specifications
Precision grade KHK W 001 grade 2 * R
Gears
Spur

Reference S
section of gear Axial G

Gear teeth Standard full depth

Normal
20°

N
O
L
pressure angle
Helical
Gears

Material S45C
Heat treatment Teeth induction hardened
Tooth hardness 50~60HRC
W2
* The precision grade of J Series products is equivalent
to the value shown in the table.
Internal
Gears

Catalog No. Axial Number of Bore Hub dia. Pitch dia. Outside dia. Face width Hub width (R) Hub width (L)
Lead angle Hand thread Shape
•:J Series (Available-on-request) module starts LH7 M N O P Q Q'
KSWG1-R1 1 3°35' R W2 8 — 16 18 — — —
m1
KSWG1-R2 2 7°08' R W2 8 — 16 18 — — —
KSWG1.5-R1 W1 10
• 1 3°26' R 20 25 28 30 10 —
Racks

KSWG1.5-R1J10 W1K 10
m1.5
KSWG1.5-R2 W1 10
• KSWG1.5-R2J10
2 6°51' R
W1K 10
20 25 28 30 10 —

a For W2-shaped products, a set screw is included. When setting up the mating wheel, make sure no friction occurs within the
CP Racks

[Caution on Product Characteristics]

& Pinions

set screw.
b These worms produce axial thrust forces. See page 512 for more details.
[Caution on Secondary Operations] a Please read “Caution on Performing Secondary Operations” (Page 512) when performing modifications and/or secondary operations for safety concerns.
b Due to the gear teeth being induction hardened, no secondary operations can be performed on tooth areas including the bottom land (approx. 1 to 2 mm).
Gears
Miter

KAG Module 1, 1.5

Worm Wheels
Gears
Bevel

G
Specifications E F
Precision grade KHK W 002 grade 2
Reference
section of gear Rotating plane
Screw
Gears

Gear teeth Standard full depth

J

Normal
pressure angle 20°

D’
Material CAC702 (formerly JIS AℓBC2) D
A
B
C

Heat treatment —
Products Gearboxes Gear Pair
Worm

Tooth hardness —
H1

Reduction Transverse No. of Number of Bore Hub dia. Pitch dia. Throat dia. Outside dia. Face width
Catalog No. module teeth starts
Helix angle Hand thread Shape
ratio AH7 B C D D' E
Bevel

KAG1-20R1 20 20 1 3°35' R H1 6 16 20 22 23 10
KAG1-20R2 10 20 2 7°08' R H1 6 16 20 22 23 10
KAG1-30R1 30 30 1 3°35' R H1 6 20 30 32 33 10
KAG1-30R2 15 m1 30 2 7°08' R H1 6 20 30 32 33 10
KAG1-40R1 40 40 1 3°35' R H1 8 26 40 42 43 10
Other

KAG1-50R1 50 50 1 3°35' R H1 8 30 50 52 53 10
KAG1-60R1 60 60 1 3°35' R H1 10 35 60 62 63 10
KAG1.5-20R1 20 20 1 3°26' R H1 8 22 30 33 34.5 14
KAG1.5-20R2 10 20 2 6°51' R H1 8 22 30 33 34.5 14
KAG1.5-30R1 30 30 1 3°26' R H1 10 30 45 48 49.5 14
KAG1.5-30R2 15 m1.5 30 2 6°51' R H1 10 30 45 48 49.5 14
KAG1.5-40R1 40 40 1 3°26' R H1 12 35 60 63 64.5 14
KAG1.5-50R1 50 50 1 3°26' R H1 12 45 75 78 79.5 14
KAG1.5-60R1 60 60 1 3°26' R H1 12 50 90 93 94.5 14
[Caution on Product Characteristics] a The allowable torques shown in the table are the calculated values according to the assumed usage conditions.
Please see page 510 for more details.

532
 KSWG

Series Ground Worms

R R

Gears
Spur
P Q P Q
S
G G

Helical
Gears
M

M
O

O
N

N
L

L
W1 W1K

Internal
Gears
Total length Keyway Set screw Weight Catalog No.
R Width×Depth Size S (kg) •:J Series (Available-on-request)

32 — M4 5 0.037 KSWG1-R1
32 — M4 5 0.037 KSWG1-R2
— — — 0.12 KSWG1.5-R1

Racks
40
4 x 1.8 M4 5 0.11 • KSWG1.5-R1J10
— — — 0.12 KSWG1.5-R2
40
4 x 1.8 M4 5 0.11 • KSWG1.5-R2J10
a As available-on-request products, requires a lead-time for shipping within 5 working-days (excludes the day ordered), after placing an order.

CP Racks
[Caution on J series]

& Pinions
Please allow additional shipping time to get to your local distributor.
b Number of products we can process for one order is 1 to 20 units. For quantities of 21 or more pieces, we need to quote price and lead time.
c Keyways are made according to JIS B1301 standards, Js 9 tolerance.
d Areas of products which have been re-worked will not be black oxide coated.
e For products having a tapped hole, a set screw is included.

Gears
Miter
KAG

Worm Wheels

Gears
Bevel
Screw
Gears
Products Gearboxes Gear Pair
Worm
NOTE 1 : Allowable torque for worm revolution (rpm)
Hub width Total length Web thickness Web O.D. Mounting distance Allowable torque (N·m) NOTE 1 Backlash Weight
Catalog No.
F G (H) (I) J 30 rpm 100 rpm 300 rpm 600 rpm 900 rpm 1200 rpm 1800 rpm (mm) (kg)

10 20 — — 18 3.35 2.79 2.23 1.83 1.63 1.50 1.30 0.08~0.19 0.038 KAG1-20R1
Bevel
10 20 — — 18 3.31 2.69 2.06 1.68 1.48 1.35 1.15 0.08~0.19 0.038 KAG1-20R2
10 20 — — 23 7.08 5.98 4.84 4.05 3.63 3.31 2.92 0.08~0.19 0.078 KAG1-30R1
10 20 — — 23 7.03 5.84 4.56 3.72 3.33 3.03 2.63 0.08~0.19 0.078 KAG1-30R2
10 20 — — 28 12.1 10.2 8.43 7.12 6.38 5.86 5.13 0.08~0.19 0.13 KAG1-40R1
10 20 — — 33 18.3 15.5 12.9 10.9 9.87 9.09 7.95 0.08~0.19 0.20 KAG1-50R1
Other

10 20 — — 38 25.6 21.8 18.1 15.4 14.1 12.9 11.4 0.08~0.19 0.29 KAG1-60R1
10 24 — — 27.5 9.84 8.18 6.40 5.30 4.68 4.25 3.68 0.10~0.21 0.10 KAG1.5-20R1
10 24 — — 27.5 9.72 7.87 5.92 4.87 4.25 3.83 3.27 0.10~0.21 0.10 KAG1.5-20R2
10 24 — — 35 20.8 17.5 13.9 11.7 10.4 9.40 8.28 0.10~0.21 0.22 KAG1.5-30R1
10 24 — — 35 20.7 17.1 13.1 10.8 9.56 8.58 7.46 0.10~0.21 0.22 KAG1.5-30R2
10 24 — — 42.5 35.6 30.0 24.2 20.6 18.3 16.6 14.6 0.10~0.21 0.37 KAG1.5-40R1
10 24 — — 50 53.8 45.4 36.9 31.6 28.3 25.8 22.6 0.10~0.21 0.59 KAG1.5-50R1
10 24 — — 57.5 75.3 63.8 51.9 44.7 40.4 36.7 32.4 0.10~0.21 0.83 KAG1.5-60R1

[Caution on Secondary Operations] a Please read “Caution on Performing Secondary Operations” (Page 512) when performing modifications
and/or secondary operations for safety concerns.

533
 KSWG Module 2, 2.5
Ground Worms
Specifications
R
Gears

Precision grade KHK W 001 grade 2 *

Spur

Reference Q’ P Q
section of gear Axial
G
Gear teeth Standard full depth
Normal
pressure angle 20°
Helical
Gears

Material S45C

M
N
O
L
Heat treatment Teeth induction hardened
Tooth hardness 50~60HRC
W3
* The precision grade of J Series products is equivalent
to the value shown in the table.
Internal
Gears

Catalog No. Axial Number of Bore Hub dia. Pitch dia. Outside dia. Face width Hub width (R) Hub width (L)
Lead angle Hand thread Shape
•:J Series (Available-on-request) module starts LH7 M N O P Q Q'
KSWG2-R1 W3 12
•• KSWG2-R1J12
KSWG2-R1J14
1 3°41' R W3K
W3K
12
14
25 31 35 32 15 3
m2
KSWG2-R2
Racks

W3 12
••KSWG2-R2J12
KSWG2-R2J14
2 7°21' R W3K
W3K
12
14
25 31 35 32 15 3

KSWG2.5-R1 W3 15
•• KSWG2.5-R1J15
1 3°52' R
W3K 15
30 37 42 45 17 3
CP Racks
& Pinions

KSWG2.5-R1J16 W3K 16
• KSWG2.5-R1J17
m2.5
W3K 17
KSWG2.5-R2 W3 15
••KSWG2.5-R2J15
KSWG2.5-R2J16
2 7°42' R
W3K
W3K
15
16
30 37 42 45 17 3

•KSWG2.5-R2J17 W3K 17
Gears
Miter

KAG Module 2, 2.5

Worm Wheels
Gears
Bevel

G
Specifications E F
Precision grade KHK W 002 grade 2
Reference
section of gear Rotating plane
Gear teeth Standard full depth
Screw
Gears

Normal
pressure angle 20°

D’
Material CAC702 (formerly JIS AℓBC2)*
D
A
B
C

Heat treatment —
Products Gearboxes Gear Pair

Tooth hardness —
Worm

*H8, H9 shape have a hub made from FC200 cast iron.

H1

Reduction Transverse No. of Number of Bore Hub dia. Pitch dia. Throat dia. Outside dia. Face width
Catalog No. ratio module teeth starts
Helix angle Hand thread Shape
AH7 B C D D' E
KAG2-20R1 20 20 1 3°41' R H1 12 33 40 44 46 18
Bevel

KAG2-20R2 10 20 2 7°21' R H1 12 33 40 44 46 18
KAG2-30R1 30 30 1 3°41' R H4 12 40 60 64 66 18
KAG2-30R2 15 m2 30 2 7°21' R H4 12 40 60 64 66 18
KAG2-40R1 40 40 1 3°41' R H4 12 45 80 84 86 18
KAG2-50R1 50 50 1 3°41' R H5 12 50 100 104 106 18
Other

KAG2-60R1 60 60 1 3°41' R H5 12 55 120 124 126 18

KAG2.5-20R1 20 20 1 3°52' R H1 12 35 50 55 57.5 20
KAG2.5-20R2 10 20 2 7°42' R H1 12 35 50 55 57.5 20
KAG2.5-30R1 30 30 1 3°52' R H4 12 40 75 80 82.5 20
KAG2.5-30R2 15 m2.5 30 2 7°42' R H4 12 40 75 80 82.5 20
KAG2.5-40R1 40 40 1 3°52' R H5 15 45 100 105 107.5 20
KAG2.5-50R1 50 50 1 3°52' R H5 15 55 125 130 132.5 20
KAG2.5-60R1 60 60 1 3°52' R H5 15 60 150 155 157.5 20
[Caution on Product Characteristics] a The allowable torques shown in the table are the calculated values according to the assumed usage conditions.
Please see page 510 for more details.
b There may be space in the casting between the two materials, but it will not affect the joint strength.
534
 KSWG

Series Ground Worms

Gears
Spur
Q’ P Q
S
G

Helical
Gears
M
N
O
L
W3K

Internal
Gears
Total length Keyway Set screw Weight Catalog No. [Caution on Product Characteristics]
R Width×Depth Size S (kg) •:J Series (Available-on-request) a These worms produce axial thrust forces. See page 512 for more details.
— — — 0.21 KSWG2-R1
••
[Caution on Secondary Operations]
50 4 x 1.8 M4 7.5 0.21 KSWG2-R1J12
5 x 2.3 M4 7.5 0.19 KSWG2-R1J14 a Please read “Caution on Performing Secondary Operations” (Page 512) when per-
KSWG2-R2 forming modifications and/or secondary operations for safety concerns.

Racks
— — — 0.21
50 4 x 1.8
5 x 2.3
M4
M4
7.5
7.5
0.21
0.19
••KSWG2-R2J12
KSWG2-R2J14
b Due to the gear teeth being induction hardened, no secondary operations can be
performed on tooth areas including the bottom land (approx. 1 to 2 mm).
— — — 0.40 KSWG2.5-R1 [Caution on J series]
65
5 x 2.3 M4 8.5 0.39
•• KSWG2.5-R1J15 a As available-on-request products, requires a lead-time for shipping within 5 working-days (excludes the

CP Racks
& Pinions
5 x 2.3 M4 8.5 0.38 KSWG2.5-R1J16
5 x 2.3 M4 8.5 0.37
• KSWG2.5-R1J16
day ordered), after placing an order.
Please allow additional shipping time to get to your local distributor.
— — — 0.40 KSWG2.5-R2 b Number of products we can process for one order is 1 to 20 units. For quantities of 21 or
65
5 x 2.3
5 x 2.3
M4
M4
8.5
8.5
0.39
0.38
••KSWG2.5-R2J15
KSWG2.5-R2J16
more pieces, we need to quote price and lead time.

•
c Keyways are made according to JIS B1301 standards, Js 9 tolerance.
5 x 2.3 M4 8.5 0.37 KSWG2.5-R2J17 d Areas of products which have been re-worked will not be black oxide coated.

Gears
e For products having a tapped hole, a set screw is included.

Miter
KAG

Worm Wheels

Gears
Bevel
G G
E F E F

(H)

Screw
Gears
J
J

D’
D’

D
A
B
C
D

(I)
A
B
C

CS

Products Gearboxes Gear Pair

Worm
CS

H4 H5
NOTE 1 : Allowable torque for worm revolution (rpm)
Hub width Total length Web thickness Web O.D. Mounting distance Allowable torque (N·m) NOTE 1 Backlash Weight
Catalog No.
F G (H) (I) J 30 rpm 100 rpm 300 rpm 600 rpm 900 rpm 1200 rpm 1800 rpm (mm) (kg)

15 33 — — 35.5 21.0 17.5 13.6 11.2 9.84 8.94 7.75 0.11~0.24 0.26 KAG2-20R1 Bevel
15 33 — — 35.5 20.7 16.8 12.6 10.3 8.93 8.05 6.89 0.11~0.24 0.26 KAG2-20R2
15 33 — — 45.5 44.3 37.3 29.6 24.8 21.9 19.8 17.4 0.11~0.24 0.51 KAG2-30R1
15 33 — — 45.5 44.0 36.5 27.8 22.8 20.1 18.0 15.7 0.11~0.24 0.51 KAG2-30R2
15 33 — — 55.5 75.8 64.0 51.4 43.6 38.5 34.9 30.7 0.11~0.24 0.85 KAG2-40R1
15 33 (8) (83) 65.5 115 96.8 78.4 66.9 59.5 54.2 47.6 0.11~0.24 1.05 KAG2-50R1
Other

15 33 (11) (100) 75.5 160 136 110 94.6 84.9 77.2 68.1 0.11~0.24 1.52 KAG2-60R1
14 34 — — 43.5 34.6 28.5 22.3 18.3 16.0 14.6 12.5 0.14~0.27 0.39 KAG2.5-20R1
14 34 — — 43.5 34.2 27.4 20.6 16.8 14.5 13.1 11.1 0.14~0.27 0.39 KAG2.5-20R2
14 34 — — 56 73.2 61.0 48.3 40.5 35.5 32.2 28.1 0.14~0.27 0.79 KAG2.5-30R1
14 34 — — 56 72.7 59.6 45.5 37.2 32.6 29.4 25.3 0.14~0.27 0.79 KAG2.5-30R2
14 34 (11) (81) 68.5 125 105 84.0 71.2 62.5 57.0 49.5 0.14~0.27 1.11 KAG2.5-40R1
14 34 (12) (106) 81 189 158 128 109 96.7 88.5 76.7 0.14~0.27 1.70 KAG2.5-50R1
14 34 (12) (130) 93.5 265 222 180 154 138 126 110 0.14~0.27 2.32 KAG2.5-60R1

[Caution on Secondary Operations] a Please read “Caution on Performing Secondary Operations” (Page 512) when performing modifications and/or secondary
operations for safety concerns.
b The tooth and the hub areas, fastened by casting, are designed to have higher hardness than other parts of the gear.
However, please avoid areas other than the hub. Also, the strength may decrease if secondary operations are performed. 535
 KSWG Module 3, 4
Ground Worms
Specifications
Precision grade KHK W 001 grade 2 * R
Gears
Spur

Reference Q’ P Q
section of gear Axial
G
Gear teeth Standard full depth
Normal
pressure angle 20°
Helical
Gears

Material S45C

M
N
O
L
Heat treatment Teeth induction hardened
Tooth hardness 50~60HRC
W3
* The precision grade of J Series products is equivalent
to the value shown in the table.
Internal
Gears

Catalog No. Axial Number of Bore Hub dia. Pitch dia. Outside dia. Face width Hub width (R) Hub width (L)
Lead angle Hand thread Shape
•:J Series (Available-on-request) module starts LH7 M N O P Q Q'
KSWG3-R1 W3 16
•• KSWG3-R1J17
KSWG3-R1J18 1 3°54' R
W3K
W3K
17
18 35 44 50 50 20 4
•• KSWG3-R1J19
KSWG3-R1J20
W3K 19
Racks

W3K 20
KSWG3-R2 W3 16
•• KSWG3-R2J17
KSWG3-R2J18 m3 2 7°46' R
W3K
W3K
17
18 35 44 50 50 20 4
•• KSWG3-R2J19
KSWG3-R2J20
W3K
W3K
19
20
CP Racks
& Pinions

KSWG3-R3 W3 16
••KSWG3-R3J17
KSWG3-R3J18 3 11°34' R
W3K
W3K
17
18 35 44 50 50 20 4
••
KSWG3-R3J19
KSWG3-R3J20
W3K
W3K
19
20
KSWG4-R1 1 3°41' R W3 22 50 62 70 70 25 5
KSWG4-R2 m4 2 7°21' R W3 22 50 62 70 70 25 5
KSWG4-R3 3 10°57' R W3 22 50 62 70 70 25 5
Gears
Miter

[Caution on Product Characteristics] a These worms produce axial thrust forces. See page 512 for more details.

KAG Module 3, 4
Worm Wheels
Gears
Bevel

G
Specifications E F
Precision grade KHK W 002 grade 2
Reference
section of gear Rotating plane
Screw
Gears

Gear teeth Standard full depth

J

Normal
pressure angle 20°

D’
Material CAC702 (formerly JIS AℓBC2)*
D
A
B
C

Heat treatment —
Products Gearboxes Gear Pair

—
Worm

Tooth hardness

*H8, H9 shape have a hub made from FC200 cast iron.

H1

Reduction Transverse No. of Number of Bore Hub dia. Pitch dia. Throat dia. Outside dia. Face width
Catalog No. module teeth starts
Helix angle Hand thread Shape
ratio AH7 B C D D' E
KAG3-20R1 20 20 1 3°54' R H1 20 50 60 66 69 25
Bevel

KAG3-20R2 10 20 2 7°46' R H1 20 50 60 66 69 25
KAG3-30R1 30 30 1 3°54' R H4 20 55 90 96 99 25
KAG3-30R2 15 30 2 7°46' R H4 20 55 90 96 99 25
KAG3-30R3 10 m3 30 3 11°34' R H4 20 55 90 96 99 25
KAG3-40R1 40 40 1 3°54' R H5 20 65 120 126 129 25
KAG3-45R3 15 45 3 11°34' R H5 20 70 135 141 144 25
Other

KAG3-50R1 50 50 1 3°54' R H5 20 75 150 156 159 25

KAG3-60R1 60 60 1 3°54' R H5 20 85 180 186 189 25
KAG4-20R1 20 20 1 3°41' R H1 20 60 80 88 92 30
KAG4-20R2 10 20 2 7°21' R H1 20 60 80 88 92 30
KAG4-30R1 30 30 1 3°41' R H4 20 65 120 128 132 30
KAG4-30R2 15 30 2 7°21' R H4 20 65 120 128 132 30
KAG4-30R3 10 m4 30 3 10°57' R H4 20 65 120 128 132 30
KAG4-40R1 40 40 1 3°41' R H5 20 80 160 168 172 30
KAG4-45R3 15 45 3 10°57' R H5 20 90 180 188 192 30
KAG4-50R1 50 50 1 3°41' R H5 20 90 200 208 212 30
KAG4-60R1 60 60 1 3°41' R H5 20 100 240 248 252 30

[Caution on Product Characteristics] a The allowable torques shown in the table are the calculated values according to the assumed usage conditions.
Please see page 510 for more details.
b There may be space in the casting between the two materials, but it will not affect the joint strength.
536
 KSWG

Series Ground Worms

Gears
Spur
Q’ P Q
S
G

Helical
Gears
M
N
O
L
W3K

Internal
Gears
Total length Keyway Set screw Weight Catalog No. [Caution on J series]
R Width×Depth Size S (kg) •:J Series (Available-on-request) a As available-on-request products, requires a lead-time for shipping within
— — — 0.66 KSWG3-R1 5 working-days (excludes the day ordered), after placing an order. Please al-
74
5 x 2.3
6 x 2.8
M4
M5
10
10
0.64
0.62
•• KSWG3-R1J17
KSWG3-R1J18
low additional shipping time to get to your local distributor.
6 x 2.8 M5 10 0.60
•• KSWG3-R1J19
b Number of products we can process for one order is 1 to 20 units.
For quantities of 21 or more pieces, we need to quote price and lead time.

Racks
6 x 2.8 M5 10 0.58 KSWG3-R1J20
— — — 0.66 KSWG3-R2 c Keyways are made according to JIS B1301 standards, Js 9 tolerance.

74
5 x 2.3
6 x 2.8
M4
M5
10
10
0.64
0.62
•• KSWG3-R2J17
KSWG3-R2J18
d Areas of products which have been re-worked will not be black oxide coated.

••
e For products having a tapped hole, a set screw is included.
6 x 2.8 M5 10 0.60 KSWG3-R2J19
6 x 2.8 M5 10 0.58 KSWG3-R2J20 [Caution on Secondary Operations]

CP Racks
& Pinions
— — — 0.66 KSWG3-R3
••
a Please read “Caution on Performing Secondary Operations” (Page 512) when perform-
5 x 2.3 M4 10 0.64 KSWG3-R3J17
74 6 x 2.8 M5 10 0.62 KSWG3-R3J18 ing modifications and/or secondary operations for safety concerns.
6 x 2.8
6 x 2.8
M5
M5
10
10
0.60
0.58
••
KSWG3-R3J19
KSWG3-R3J20
b Due to the gear teeth being induction hardened, no secondary operations can be per-
formed on tooth areas including the bottom land (approx. 1 to 2 mm).
100 — — — 1.82 KSWG4-R1
100 — — — 1.82 KSWG4-R2
KSWG4-R3

Gears
100 — — — 1.82

Miter
KAG

Worm Wheels

Gears
Bevel
G G
E F E F

Screw
Gears
(H)
J
J

D’
D’

D
A
B
C
D

(I)
A
B
C

CS

Products Gearboxes Gear Pair

Worm
CS

H4 H5
NOTE 1 : Allowable torque for worm revolution (rpm)
Hub width Total length Web thickness Web O.D. Mounting distance Allowable torque (N·m) NOTE 1 Backlash Weight
Catalog No.
F G (H) (I) J 30 rpm 100 rpm 300 rpm 600 rpm 900 rpm 1200 rpm 1800 rpm (mm) (kg)
18 43 — — 52 59.5 48.8 38.0 30.9 27.0 24.7 20.9 0.16~0.29 0.75 KAG3-20R1 Bevel
18 43 — — 52 58.7 46.9 35.1 28.4 24.5 22.2 18.5 0.16~0.29 0.75 KAG3-20R2
18 43 — — 67 126 104.3 82.4 68.4 59.9 54.5 46.9 0.16~0.29 1.46 KAG3-30R1
18 43 — — 67 125 102 77.6 62.8 55.1 49.7 42.2 0.16~0.29 1.46 KAG3-30R2
18 43 — — 67 129 103 77.1 62.4 53.8 48.7 40.6 0.16~0.29 1.46 KAG3-30R3
18 43 (10) (103) 82 215 179 143 120 106 96.4 82.5 0.16~0.29 2.03 KAG3-40R1
18 43 (11) (120) 89.5 274 224 171 138 121 109 92.6 0.16~0.29 2.44 KAG3-45R3
Other

18 43 (15) (130) 97 325 270 219 185 163 150 128 0.16~0.29 3.22 KAG3-50R1
18 43 (15) (155) 112 455 380 308 261 233 213 183 0.16~0.29 4.52 KAG3-60R1
20 50 — — 71 115 93.6 72.7 58.2 51.1 45.7 38.4 0.19~0.32 1.53 KAG4-20R1
20 50 — — 71 114 90.0 67.2 53.5 46.4 41.2 34.1 0.19~0.32 1.53 KAG4-20R2
20 50 — — 91 244 200 158 129 114 101 86.3 0.19~0.32 3.00 KAG4-30R1
20 50 — — 91 242 196 148 118 104 92.2 77.6 0.19~0.32 3.00 KAG4-30R2
20 50 — — 91 250 198 147 117 102 90.2 74.7 0.19~0.32 3.00 KAG4-30R3
20 50 (15) (133) 111 417 343 274 226 200 179 152 0.19~0.32 4.32 KAG4-40R1
20 50 (16) (153) 121 531 430 326 259 229 202 170 0.19~0.32 5.44 KAG4-45R3
20 50 (16) (173) 131 630 519 418 347 309 277 236 0.19~0.32 6.25 KAG4-50R1
20 50 (17) (210) 151 881 730 589 491 441 395 337 0.19~0.32 8.74 KAG4-60R1

[Caution on Secondary Operations] a Please read “Caution on Performing Secondary Operations” (Page 512) when performing modifications and/or secondary
operations for safety concerns.
b The tooth and the hub areas, fastened by casting, are designed to have higher hardness than other parts of the gear. However, please avoid
areas other than the hub. Also, the strength may decrease if secondary operations are performed. 537
 KSWG Module 5, 6
Ground Worms
Specifications
R
Gears

Precision grade KHK W 001 grade 2

Spur

Reference Q’ P Q
section of gear Axial
G
Gear teeth Standard full depth
Normal
pressure angle 20°
Helical
Gears

Material S45C

M
N
O
L
Heat treatment Teeth induction hardened
Tooth hardness 50~60HRC
W3
Internal
Gears

Axial Number of Bore Hub dia. Pitch dia. Outside dia. Face width Hub width (R) Hub width (L)
Catalog No. module starts
Lead angle Hand thread Shape
LH7 M N O P Q Q'
KSWG5-R1 1 4°05' R W3 25 56 70 80 85 30 5
m5
KSWG5-R2 2 8°08' R W3 25 56 70 80 85 30 5
KSWG6-R1 1 4°17' R W3 30 63 80 92 100 35 5
m6
Racks

KSWG6-R2 2 8°32' R W3 30 63 80 92 100 35 5

[Caution on Product Characteristics] a These worms produce axial thrust forces. See page 512 for more details.
CP Racks
& Pinions

 For products not categorized in our Stock Gear series', custom gear
production services with short lead times is available. For details see page VI.
Gears
Miter

KAG Module 5, 6
Worm Wheels
G
Gears
Bevel

Specifications E F
Precision grade KHK W 002 grade 2
Reference
section of gear Rotating plane
Gear teeth Standard full depth
J
Screw
Gears

Normal
pressure angle 20°

D’
Material CAC702 (formerly JIS AℓBC2)*

D
A
B
C
Heat treatment —
Tooth hardness —
Products Gearboxes Gear Pair

H1
Worm

*H8, H9 shape have a hub made from FC200 cast iron.

Reduction Transverse No. of Number of Bore Hub dia. Pitch dia. Throat dia. Outside dia. Face width
Catalog No. module teeth starts
Helix angle Hand thread Shape
ratio AH7 B C D D' E
KAG5-20R1 20 20 1 4°05' R H4 22 75 100 110 115 35
KAG5-20R2 10 20 2 8°08' R H4 22 75 100 110 115 35
Bevel

KAG5-30R1 30 30 1 4°05' R H5 22 75 150 160 165 35

KAG5-30R2 15 m5 30 2 8°08' R H5 22 75 150 160 165 35
KAG5-40R1 40 40 1 4°05' R H5 22 110 200 210 215 35
KAG5-50R1 50 50 1 4°05' R H5 22 120 250 260 265 35
KAG5-60R1 60 60 1 4°05' R H5 22 130 300 310 315 35
Other

KAG6-20R1 20 20 1 4°17' R H4 25 85 120 132 138 40

KAG6-20R2 10 20 2 8°32' R H4 25 85 120 132 138 40
KAG6-30R1 30 30 1 4°17' R H5 25 100 180 192 198 40
KAG6-30R2 15 m6 30 2 8°32' R H5 25 100 180 192 198 40
KAG6-40R1 40 40 1 4°17' R H5 25 120 240 252 258 40
KAG6-50R1 50 50 1 4°17' R H5 25 130 300 312 318 40
KAG6-60R1 60 60 1 4°17' R H5 25 150 360 372 378 40
[Caution on Product Characteristics] a The allowable torques shown in the table are the calculated values according to the assumed usage conditions.
Please see page 510 for more details.
b There may be space in the casting between the two materials, but it will not affect the joint strength.

538
 KSWG

Ground Worms

Gears
Spur
Helical
Gears
Total length Set screw Weight
Catalog No.
R Size S (kg)

120 — — 2.78 KSWG5-R1

Internal
Gears
120 — — 2.78 KSWG5-R2
140 — — 4.15 KSWG6-R1
140 — — 4.15 KSWG6-R2
[Caution on Secondary Operations] a Please read “Caution on Performing Secondary Operations” (Page 512) when performing modifications and/or secondary operations for safety concerns.
b Due to the gear teeth being induction hardened, no secondary operations can be performed on tooth areas including the bottom land (approx. 1 to 2 mm).

Racks
CP Racks
& Pinions
Gears
Miter
KAG

G G Worm Wheels
E F E F

Gears
Bevel
(H)
J
J

D’
D’

D
A
B
C

Screw
Gears
(I)
D
A
B
C

H4 H5

Products Gearboxes Gear Pair

NOTE 1. Allowable torques for worm rotation (rpm)

Worm
Hub width Total length Web thickness Web O.D. Mounting distance Allowable torque (N·m) NOTE 1 Backlash Weight
Catalog No.
F G (H) (I) J 30 rpm 100 rpm 300 rpm 600 rpm 900 rpm 1200 rpm 1800 rpm (mm) (kg)

25 60 — — 85 202 163 127 101 88.4 79.0 65.5 0.22~0.35 2.79 KAG5-20R1
25 60 — — 85 200 157 117 93.2 80.2 71.1 58.1 0.22~0.35 2.79 KAG5-20R2 Bevel
25 60 (21) (120) 110 427 348 275 224 196 175 147 0.22~0.35 4.75 KAG5-30R1
25 60 (21) (120) 110 425 340 259 206 180 159 132 0.22~0.35 4.75 KAG5-30R2
25 60 (23) (168) 135 731 597 478 394 346 309 259 0.22~0.35 8.84 KAG5-40R1
25 60 (23) (215) 160 1110 903 729 605 534 479 402 0.22~0.35 12.7 KAG5-50R1
25 60 (24) (260) 185 1550 1270 1030 855 763 682 575 0.22~0.35 17.6 KAG5-60R1
Other

30 70 — — 100 315 252 196 157 135 121 99.6 0.24~0.37 4.53 KAG6-20R1
30 70 — — 100 314 244 182 145 124 110 89.3 0.24~0.37 4.53 KAG6-20R2
30 70 (26) (142) 130 666 538 424 346 300 267 224 0.24~0.37 8.52 KAG6-30R1
30 70 (26) (142) 130 668 532 403 321 278 246 203 0.24~0.37 8.52 KAG6-30R2
30 70 (28) (200) 160 1140 923 738 609 528 472 394 0.24~0.37 14.2 KAG6-40R1
30 70 (30) (258) 190 1720 1400 1130 935 816 733 611 0.24~0.37 21.0 KAG6-50R1
30 70 (30) (312) 220 2410 1960 1580 1320 1170 1040 875 0.24~0.37 29.7 KAG6-60R1
[Caution on Secondary Operations] a Please read “Caution on Performing Secondary Operations” (Page 512) when performing modifications
and/or secondary operations for safety concerns.
b The tooth and the hub areas, fastened by casting, are designed to have higher hardness than other parts of the
gear. However, please avoid areas other than the hub. Also, the strength may decrease if secondary operations
are performed.
539
 KSW Module 0.5, 0.8
Steel Worms
Specifications R
S
Gears

Precision grade KHK W 001 grade 4

Spur

Reference
section of gear Normal plane
Gear teeth Standard full depth

N
O
L
Normal
pressure angle 20°
Helical
Gears

Material S45C
Heat treatment —
W2
Tooth hardness (less than 194HB)
Internal
Gears

Normal Number of Bore Hub dia. Pitch dia. Outside dia. Face width Hub width (R) Hub width (L)
Catalog No. module starts
Lead angle Hand thread Shape
LH8 M N O P Q Q'
KSW0.5-R1
m0.5
1 2°36' R W2 5 — 11 12 — — —
KSW0.5-R2 2 5°13' R W2 5 — 11 12 — — —
KSW0.8-R1
m0.8
1 3°17' R W2 6 — 14 15.6 — — —
KSW0.8-R2 2 6°34' R W2 6 — 14 15.6 — — —
Racks

[Caution on Product Characteristics] a For W2-shaped products, a set screw is included. When setting up the mating wheel, make sure no friction occurs
within the set screw.
b These worms produce axial thrust forces. See page 512 for more details.
CP Racks
& Pinions

 For products not categorized in our Stock Gear series', custom gear
production services with short lead times is available. For details see page VI.
Gears
Miter

KBG Module 0.5, 0.8

Bronze Worm Wheels
Gears
Bevel

Specifications
Precision grade KHK W 002 grade 4 G
E F
Reference
section of gear Normal plane L

Standard full depth

Screw

Gear teeth
Gears

Normal
pressure angle 20°
D’
A
B
C

Material CAC502 (formerly JIS PBC2)

Heat treatment —
Products Gearboxes Gear Pair
Worm

Tooth hardness —
HAT

Reduction Normal No. of Number of Bore Hub dia. Pitch dia. Throat dia. Outside dia. Face width
Catalog No. module teeth starts
Helix angle Hand thread Shape
ratio AH7 B C D D' E
KBG0.5-20R1 20 20 1 2°36' R HAT 4 9 10.01 — 11 5
Bevel

KBG0.5-20R2 10 20 2 5°13' R HAT 4 9 10.04 — 11 5

KBG0.5-30R1 30 30 1 2°36' R HAT 4 12 15.02 — 16 5
KBG0.5-30R2 15 m0.5 30 2 5°13' R HAT 4 12 15.06 — 16 5
KBG0.5-40R1 40 40 1 2°36' R HAT 5 15 20.02 — 21 5
KBG0.5-50R1 50 50 1 2°36' R HAT 5 20 25.03 — 26 5
KBG0.5-60R1 60 60 1 2°36' R HAT 5 25 30.03 — 31 5
Other

Reduction Normal No. of Number of Bore Hub dia. Pitch dia. Throat dia. Outside dia. Face width
Catalog No. module teeth starts
Helix angle Hand thread Shape
ratio AH7 B C D D' E
KBG0.8-20R1 20 20 1 3°17' R HA 5 12 16.03 — 17.6 9
KBG0.8-20R2 10 20 2 6°34' R HA 5 12 16.11 — 17.6 9
KBG0.8-30R1 30 30 1 3°17' R HA 5 18 24.04 — 25.6 9
KBG0.8-30R2 15 m0.8 30 2 6°34' R HA 5 18 24.16 — 25.6 9
KBG0.8-40R1 40 40 1 3°17' R HA 6 20 32.05 — 33.6 9
KBG0.8-50R1 50 50 1 3°17' R HA 8 25 40.06 — 41.6 9
KBG0.8-60R1 60 60 1 3°17' R HA 8 25 48.08 — 49.6 9
[Caution on Product Characteristics] a Worm Wheels are profile shifted to create the proper center distance.
b For products with a tapped hole, a set screw is included.
c The allowable torques shown in the table are the calculated values according to the assumed usage conditions. Please see page 510 for more details.
540 d If bore size is less than ø4, the diameter tolerance is H8. If bore size is ø5 or ø6, and the hole length exceeds 3 times the diameter, the tolerance is also H8.
 KSW

Steel Worms

Gears
Spur
Helical
Gears
Internal
Gears
Total length Set screw Weight
Catalog No.
R Size S (kg)
18 M3 3 0.010 KSW0.5-R1
18 M3 3 0.010 KSW0.5-R2
30 M4 5 0.029 KSW0.8-R1
30 M4 5 0.029 KSW0.8-R2

Racks
[Caution on Secondary Operations] a Please read “Caution on Performing Secondary Operations” (Page 512) when performing modifications and/or secondary operations
for safety concerns.
b Gear tooth hardening of the worm reduces the precision (introduces errors in the lead and pressure angles). Avoid heat hardening as
it will create bad tooth contact causing abrasion of the wheel.

CP Racks
& Pinions
Gears
Miter
KBG

Bronze Worm Wheels

Gears
Bevel
G
E F

Screw
J

Gears
D’
A
B
C

Products Gearboxes Gear Pair

Worm
HA
NOTE 1 : Allowable torque for worm revolution (rpm)
Hub width Total length Mounting distance Set screw Allowable torque (N·m) NOTE 1 Backlash Weight
Catalog No.
F G J Size L 30 rpm 100 rpm 300 rpm 600 rpm 900 rpm 1200 rpm (mm) (kg)
7 12 10.5 M3 3.5 0.27 0.23 0.19 0.15 0.14 0.13 0~0.16 0.0061 KBG0.5-20R1 Bevel
7 12 10.5 M3 3.5 0.28 0.23 0.18 0.15 0.13 0.12 0~0.16 0.0061 KBG0.5-20R2
7 12 13 M3 3.5 0.58 0.50 0.41 0.34 0.30 0.28 0~0.16 0.014 KBG0.5-30R1
7 12 13 M3 3.5 0.59 0.49 0.39 0.32 0.29 0.26 0~0.16 0.014 KBG0.5-30R2
7 12 15.5 M4 3.5 0.99 0.85 0.71 0.60 0.54 0.50 0~0.16 0.023 KBG0.5-40R1
7 12 18 M4 3.5 1.50 1.28 1.08 0.92 0.83 0.77 0~0.16 0.039 KBG0.5-50R1
7 12 20.5 M4 3.5 2.10 1.80 1.52 1.31 1.19 1.09 0~0.16 0.059 KBG0.5-60R1
Other

NOTE 1 : Allowable torque for worm revolution (rpm)

Hub width Total length Mounting distance Allowable torque (N·m) NOTE 1 Backlash Weight
Catalog No.
F G J 30 rpm 100 rpm 300 rpm 600 rpm 900 rpm 1200 rpm (mm) (kg)
9 18 15 1.05 0.88 0.71 0.58 0.52 0.48 0.04~0.22 0.023 KBG0.8-20R1
9 18 15 1.06 0.86 0.66 0.54 0.48 0.44 0.04~0.22 0.023 KBG0.8-20R2
9 18 19 2.23 1.89 1.53 1.29 1.15 1.06 0.04~0.22 0.055 KBG0.8-30R1
9 18 19 2.24 1.87 1.46 1.20 1.07 0.98 0.04~0.22 0.055 KBG0.8-30R2
9 18 23 3.81 3.24 2.67 2.26 2.02 1.87 0.04~0.22 0.087 KBG0.8-40R1
9 18 27 5.76 4.90 4.07 3.47 3.13 2.90 0.04~0.22 0.13 KBG0.8-50R1
9 18 31 8.06 6.88 5.73 4.90 4.46 4.12 0.04~0.22 0.18 KBG0.8-60R1
[Caution on Secondary Operations] a Please read “Caution on Performing Secondary Operations” (Page 512) when performing modifications
and/or secondary operations for safety concerns.

541
 KSW Module 1, 1.25
Steel Worms
Specifications R
S
Gears

Precision grade KHK W 001 grade 4

Spur

Reference
section of gear Normal plane
Gear teeth Standard full depth

N
O
L
Normal
pressure angle 20°
Helical
Gears

Material S45C
Heat treatment —
W2
Tooth hardness (less than 194HB)
Internal
Gears

Normal Number of Bore Hub dia. Pitch dia. Outside dia. Face width Hub width (R) Hub width (L)
Catalog No. module starts
Lead angle Hand thread Shape
LH7 M N O P Q Q'
KSW1-R1
m1
1 3°35' R W2 6 — 16 18 — — —
KSW1-R2 2 7°11' R W2 6 — 16 18 — — —
KSW1.25-R1
m1.25
1 3°25' R W2 8 — 21 23.5 — — —
KSW1.25-R2 2 6°50' R W2 8 — 21 23.5 — — —
Racks

[Caution on Product Characteristics] a For W2-shaped products, a set screw is included. When setting up the mating wheel, make sure no friction occurs within the
set screw.
b These worms produce axial thrust forces. See page 512 for more details.
c If bore size is less than ø4, the diameter tolerance is H8. If bore size is ø5 or ø6, and the hole length exceeds 3 times the diameter, the tolerance is also H8.
CP Racks
& Pinions

KBG • KCG Module 1, 1.25

Bronze Worm Wheels & Gray Iron Worm Wheels
Gears
Miter

KBG KCG

G
Specifications E F
Catalog No. KBG KCG
Gears
Bevel

Precision grade KHK W 002 grade 4 KHK W 002 grade 4

Reference
section of gear Normal plane Normal plane J

Gear teeth Standard full depth Standard full depth

D’
Normal
20° 20°

D
A
B
C
pressure angle
Screw
Gears

Material CAC502(formerly JIS PBC2) FC200

Heat treatment — —
H1
Tooth hardness — —
Products Gearboxes Gear Pair
Worm

Reduction Normal No. of Number of Bore Hub dia. Pitch dia. Throat dia. Outside dia. Face width
Catalog No. module teeth starts
Helix angle Hand thread Shape
ratio AH7 B C D D' E
KBG1-20R1 20 20 1 3°35' R H1 6 16 20.05 22 23 10
KBG1-20R2 10 20 2 7°11' R H1 6 16 20.16 22 23 10
KBG1-30R1 30 30 1 3°35' R H1 6 20 30.07 32 33 10
m1
KBG1-30R2 15 30 2 7°11' R H1 6 20 30.24 32 33 10
KBG1-40R1 40 40 1 3°35' R H1 8 26 40.08 42 43 10
Bevel

KBG1-50R1 50 50 1 3°35' R H1 8 30 50.1 52 53 10

KBG1.25-20R1 20 20 1 3°25' R H1 6 20 25.04 27.5 28.75 11
KBG1.25-20R2 10 20 2 6°50' R H1 6 20 25.18 27.5 28.75 11
KBG1.25-30R1 30 30 1 3°25' R H1 6 25 37.57 40 41.25 11
m1.25
KBG1.25-30R2 15 30 2 6°50' R H1 6 25 37.77 40 41.25 11
KBG1.25-40R1 40 40 1 3°25' R H1 8 30 50.09 52.5 53.75 11
Other

KBG1.25-50R1 50 50 1 3°25' R H1 8 40 62.61 65 66.25 11

Reduction Normal No. of Number of Bore Hub dia. Pitch dia. Throat dia. Outside dia. Face width
Catalog No. module teeth starts
Helix angle Hand thread Shape
ratio AH7 B C D D' E
KCG1-60R1 60 60 1 3°35' R HB 10 30 60.12 62 63 10
KCG1-80R1 80 80 1 3°35' R HB 10 35 80.16 82 83 10
m1
KCG1-100R1 100 100 1 3°35' R H2 10 40 100.2 102 103 10
KCG1-120R1 120 120 1 3°35' R H2 10 40 120.24 122 123 10

[Caution on Product Characteristics] a Worm Wheels are profile shifted to create the proper center distance.
b H2 Shape Worm Gears have elongated casting holes in the web (H).
c The allowable torques shown in the table are the calculated values according to the assumed usage conditions. Please see page 510 for more details.
d If bore size is less than ø4, the diameter tolerance is H8. If bore size is ø5 or ø6, and the hole length exceeds 3 times the diameter, the tolerance is also H8.
542
 KSW

Steel Worms

Gears
Spur
 For products not categorized in our Stock Gear series', custom gear
production services with short lead times is available. For details see page VI.

Helical
Gears
Internal
Gears
Total length Set screw Weight
Catalog No.
R Size S (kg)
32 M4 5 0.043 KSW1-R1
32 M4 5 0.043 KSW1-R2
37 M5 5 0.085 KSW1.25-R1
37 M5 5 0.085 KSW1.25-R2

Racks
[Caution on Secondary Operations] a Please read “Caution on Performing Secondary Operations” (Page 512) when performing modifications and/or secondary operations
for safety concerns.
b Gear tooth hardening of the worm reduces the precision (introduces errors in the lead and pressure angles). Avoid heat hardening as
it will create bad tooth contact causing abrasion of the wheel.

CP Racks
& Pinions
KBG • KCG

Gears
Miter
Bronze Worm Wheels & Gray Iron Worm Wheels
G G
E F E F

Gears
Bevel
(H) （H）
J

D’
D’

D
A
B
C
D
A
B
C
(I)

(I)

Screw
Gears
CS
CS

CS
CS

HB H2
* CS has a sand mold casting finish.
NOTE 1 : Allowable torque for worm revolution (rpm)

Products Gearboxes Gear Pair

Total length Mounting distance

Worm
Hub width Allowable torque (N·m) NOTE 1 Backlash Weight
Catalog No.
F G J 30 rpm 100 rpm 300 rpm 600 rpm 900 rpm 1200 rpm (mm) (kg)

10 20 18 1.89 1.58 1.26 1.04 0.92 0.85 0.06~0.24 0.043 KBG1-20R1

10 20 18 1.90 1.54 1.18 0.97 0.85 0.78 0.06~0.24 0.043 KBG1-20R2
10 20 23 4.00 3.38 2.74 2.29 2.05 1.87 0.06~0.24 0.089 KBG1-30R1
10 20 23 4.03 3.35 2.62 2.14 1.91 1.74 0.06~0.24 0.089 KBG1-30R2
10 20 28 6.85 5.79 4.76 4.03 3.61 3.31 0.06~0.24 0.15 KBG1-40R1 Bevel
10 20 33 10.3 8.76 7.27 6.18 5.58 5.14 0.06~0.24 0.23 KBG1-50R1
9 20 23 3.19 2.65 2.10 1.72 1.53 1.40 0.08~0.26 0.070 KBG1.25-20R1
9 20 23 3.19 2.58 1.96 1.60 1.40 1.27 0.08~0.26 0.070 KBG1.25-20R2
9 20 29.25 6.75 5.67 4.56 3.81 3.40 3.09 0.08~0.26 0.15 KBG1.25-30R1
9 20 29.25 6.77 5.60 4.33 3.54 3.16 2.85 0.08~0.26 0.15 KBG1.25-30R2
9 20 35.5 11.5 9.71 7.92 6.70 5.98 5.47 0.08~0.26 0.24 KBG1.25-40R1
Other

9 20 41.75 17.4 14.7 12.1 10.3 9.25 8.49 0.08~0.26 0.40 KBG1.25-50R1

NOTE 1 : Allowable torque for worm revolution (rpm)

Hub width Total length Web thickness Web O.D. Mounting distance Allowable torque (N·m) NOTE 1 Backlash Weight
Catalog No.
F G (H) (I) J 30 rpm 100 rpm 300 rpm 600 rpm 900 rpm 1200 rpm (mm) (kg)

10 20 (6) (51) 38 8.69 7.39 6.14 5.24 4.78 4.39 0.06~0.24 0.21 KCG1-60R1
10 20 (6) (70) 48 14.7 12.6 10.5 9.11 8.30 7.72 0.06~0.24 0.35 KCG1-80R1
10 20 (6) (91) 58 21.9 19.0 16.0 13.9 12.7 11.9 0.06~0.24 0.47 KCG1-100R1
10 20 (6) (111) 68 30.5 26.7 22.5 19.6 18.0 16.7 0.06~0.24 0.63 KCG1-120R1

[Caution on Secondary Operations] a Please read “Caution on Performing Secondary Operations” (Page 512) when performing modifications
and/or secondary operations for safety concerns.

543
 KSW Module 1.5
Steel Worms
Specifications R

Precision grade KHK W 001 grade 4 * P Q

Gears
Spur

Reference
section of gear Normal plane
Gear teeth Standard full depth
Normal
pressure angle 20°

M
N
O
L
Helical
Gears

Material S45C
Heat treatment —
W1
Tooth hardness (less than 194HB)
* The precision grade of J Series products is equivalent
to the value shown in the table.
Internal
Gears

Catalog No. Normal Number of Bore Hub dia. Pitch dia. Outside dia. Face width Hub width (R) Hub width (L)
Lead angle Hand thread Shape
• : J Series (Available-on-request) module starts LH7 M N O P Q Q'
KSW1.5-R1 W1 8
•• KSW1.5-R1J8
KSW1.5-R1J10
1 3°26' R W1T
W1K
8
10
20 25 28 30 10 —
m1.5
Racks

KSW1.5-R2 W1 8
••KSW1.5-R2J8
KSW1.5-R2J10
2 6°54' R W1T
W1K
8
10
20 25 28 30 10 —

[Caution on Product Characteristics] a These worms produce axial thrust forces. See page 512 for more details.
CP Racks
& Pinions

[Caution on Secondary Operations] a Please read “Caution on Performing Secondary Operations” (Page 512) when performing modifications and/or secondary operations for safety concerns.
b Gear tooth hardening of the worm reduces the precision (introduces errors in the lead and pressure angles). Avoid heat hardening as it will create bad tooth contact
causing abrasion of the wheel.
Gears
Miter

KBG • KCG Module 1.5

Bronze Worm Wheels & Gray Iron Worm Wheels KBG KCG
Gears
Bevel

G
Specifications E F
Catalog No. KBG KCG
Precision grade KHK W 002 grade 4 KHK W 002 grade 4
Reference
Normal plane Normal plane
Screw
Gears

section of gear
Gear teeth Standard full depth Standard full depth

D’
Normal
20° 20°

D
A
B
C
pressure angle
Material CAC502 (formerly JIS PBC2) FC200
Products Gearboxes Gear Pair

Heat treatment — —
Worm

H1
Tooth hardness — —

Reduction Normal No. of Number of Bore Hub dia. Pitch dia. Throat dia. Outside dia. Face width
Catalog No. module teeth starts
Helix angle Hand thread Shape
ratio AH7 B C D D' E
KBG1.5-20R1 20 20 1 3°26' R H1 8 22 30.05 33 34.5 12
Bevel

KBG1.5-20R2 10 20 2 6°54' R H1 8 22 30.22 33 34.5 12

KBG1.5-30R1 30 30 1 3°26' R H1 10 30 45.08 48 49.5 12
m1.5
KBG1.5-30R2 15 30 2 6°54' R H1 10 30 45.33 48 49.5 12
KBG1.5-40R1 40 40 1 3°26' R H1 12 30 60.11 63 64.5 12
KBG1.5-50R1 50 50 1 3°26' R H1 12 40 75.13 78 79.5 14
Other

Reduction Normal No. of Number of Bore Hub dia. Pitch dia. Throat dia. Outside dia. Face width
Catalog No. module teeth starts
Helix angle Hand thread Shape
ratio AH7 B C D D' E
KCG1.5-30R1 30 30 1 3°26' R H1 10 30 45.08 48 49.5 12
KCG1.5-40R1 40 40 1 3°26' R H1 12 30 60.11 63 64.5 12
KCG1.5-50R1 50 50 1 3°26' R HB 12 40 75.13 78 79.5 14
m1.5
KCG1.5-60R1 60 60 1 3°26' R HB 12 40 90.16 93 94.5 14
KCG1.5-80R1 80 80 1 3°26' R H2 15 50 120.22 123 124.5 14
KCG1.5-100R1 100 100 1 3°26' R H2 15 50 150.27 153 154.5 14

[Caution on Product Characteristics] a Worm Wheels are profile shifted to create the proper center distance.
b H2 Shape Worm Gears have elongated casting holes in the web (H).
c The allowable torques shown in the table are the calculated values according to the assumed usage conditions. Please see page 510 for more details.

544
 KSW

Series Steel Worms

R R

Gears
Spur
P Q P Q
S S

Helical
Gears
M

M
N
O

N
O
L

L
W1T W1K

Internal
Gears
Total length Keyway Set screw Weight Catalog No.
R Width×Depth Size S (kg) •: J Series (Available-on-request)

— — — 0.12 KSW1.5-R1
40 —
4 x 1.8
M5
M4
5
5
0.12
0.11
•• KSW1.5-R1J8
KSW1.5-R1J10
— — —

Racks
0.12 KSW1.5-R2
40 —
4 x 1.8
M5
M4
5
5
0.12
0.11
••KSW1.5-R2J8
KSW1.5-R2J10

[Caution on J series] a As available-on-request products, requires a lead-time for shipping within 5 working-days (excludes the day ordered), after placing an order.
Please allow additional shipping time to get to your local distributor.

CP Racks
& Pinions
b Number of products we can process for one order is 1 to 20 units. For quantities of 21 or more pieces, we need to quote price and lead time.
c Keyways are made according to JIS B1301 standards, Js 9 tolerance.
d Areas of products which have been re-worked will not be black oxide coated.
e For products having a tapped hole, a set screw is included.

Gears
Miter
KBG • KCG

Bronze Worm Wheels & Gray Iron Worm Wheels

Gears
Bevel
G G
E F E F

(H)

Screw
（H）

Gears
J

D’
D’

D
A
B
C
D
A
B
C
(I)

(I)
CS
CS

Products Gearboxes Gear Pair

Worm
CS
CS

HB H2
* CS has a sand mold casting finish.
NOTE 1 : Allowable torque for worm revolution (rpm)
Hub width Total length Mounting distance Allowable torque (N·m) NOTE 1 Backlash Weight
Catalog No.
F G J 30 rpm 100 rpm 300 rpm 600 rpm 900 rpm 1200 rpm (mm) (kg)

10 22 27.5 4.76 3.96 3.10 2.56 2.27 2.06 0.08~0.26 0.10 KBG1.5-20R1 Bevel
10 22 27.5 4.75 3.85 2.89 2.38 2.08 1.87 0.08~0.26 0.10 KBG1.5-20R2
10 22 35 10.1 8.47 6.72 5.67 5.03 4.55 0.08~0.26 0.22 KBG1.5-30R1
10 22 35 10.1 8.37 6.40 5.26 4.67 4.20 0.08~0.26 0.22 KBG1.5-30R2
10 22 42.5 17.2 14.5 11.7 9.96 8.86 8.04 0.08~0.26 0.35 KBG1.5-40R1
10 24 50 30.4 25.6 20.8 17.8 16.0 14.6 0.08~0.26 0.65 KBG1.5-50R1
Other

NOTE 1 : Allowable torque for worm revolution (rpm)

Hub width Total length Web thickness Web O.D. Mounting distance Allowable torque (N·m) NOTE 1 Backlash Weight
Catalog No.
F G (H) (I) J 30 rpm 100 rpm 300 rpm 600 rpm 900 rpm 1200 rpm (mm) (kg)

10 22 — — 35 6.04 5.08 4.03 3.40 3.02 2.73 0.08~0.26 0.18 KCG1.5-30R1

10 22 — — 42.5 10.3 8.71 7.01 5.98 5.31 4.83 0.08~0.26 0.28 KCG1.5-40R1
10 24 (6) (62) 50 18.2 15.4 12.5 10.7 9.59 8.74 0.08~0.26 0.43 KCG1.5-50R1
10 24 (4) (79) 57.5 25.5 21.6 17.6 15.1 13.7 12.4 0.08~0.26 0.47 KCG1.5-60R1
10 24 (9) (112) 72.5 43.1 36.8 30.1 26.3 23.8 21.9 0.08~0.26 0.94 KCG1.5-80R1
10 24 (7) (138) 87.5 64.4 55.6 45.8 40.1 36.4 33.6 0.08~0.26 1.21 KCG1.5-100R1

[Caution on Secondary Operations] a Please read “Caution on Performing Secondary Operations” (Page 512) when performing modifications
and/or secondary operations for safety concerns.

545
 KSW Module 2
Steel Worms
Specifications R

Precision grade KHK W 001 grade 4 * P Q

Gears
Spur

Reference
section of gear Normal plane
Gear teeth Standard full depth
Normal
pressure angle 14° 30'

M
N
O
L
Helical
Gears

Material S45C
Heat treatment —
W1
Tooth hardness (less than 194HB)
* The precision grade of J Series products is equivalent
to the value shown in the table.
Internal
Gears

Catalog No. Normal Number of Bore Hub dia. Pitch dia. Outside dia. Face width Hub width (R) Hub width (L)
Lead angle Hand thread Shape
•: J Series (Available-on-request) module starts LH7 M N O P Q Q'
KSW2-R1 W1 12
•• KSW2-R1J12
KSW2-R1J14
1 3°42' R W1K
W1K
12
14
25 31 35 32 14 —
KSW2-R2 W1 12
••
Racks

KSW2-R2J12 2 7°25' R W1K 12 25 31 35 32 14 —

KSW2-R2J14 W1K 14
m2
KSW2-L1 W1 12
••KSW2-L1J12
KSW2-L1J14
1 3°42' L W1K
W1K
12
14
25 31 35 32 14 —
CP Racks
& Pinions

KSW2-L2 W1 12
••
KSW2-L2J12
KSW2-L2J14
2 7°25' L W1K
W1K
12
14
25 31 35 32 14 —

[Caution on Product Characteristics] a These worms produce axial thrust forces. See page 512 for more details.
[Caution on Secondary Operations] a Please read “Caution on Performing Secondary Operations” (Page 512) when performing modifications and/or secondary operations for safety concerns.
b Gear tooth hardening of the worm reduces the precision (introduces errors in the lead and pressure angles). Avoid heat hardening as it will create bad tooth contact causing abrasion of the wheel.

Module 2
Gears

KBG • KCG
Miter

Bronze Worm Wheels & Gray Iron Worm Wheels KBG KCG
G
Specifications E F
Gears
Bevel

Catalog No. KBG KCG

Precision grade KHK W 002 grade 4 KHK W 002 grade 4
Reference
Normal plane Normal plane
J

section of gear
Gear teeth Standard full depth Standard full depth
Screw
Gears

D’
Normal
14° 30' 14° 30'

D
A
B
C
pressure angle
Material CAC502(formerly JIS PBC2) FC200
Heat treatment — —
H1
Tooth hardness — —
Products Gearboxes Gear Pair
Worm

Reduction Normal No. of Number of Bore Hub dia. Pitch dia. Throat dia. Outside dia. Face width
Catalog No. module teeth starts
Helix angle Hand thread Shape
ratio AH7 B C D D' E
KBG2-20R1 20 20 1 3°42' R H1 12 33 40.08 44 46 22
KBG2-20R2 10 20 2 7°25' R H1 12 33 40.34 44 46 22
m2
KBG2-20L1 20 20 1 3°42' L H1 12 33 40.08 44 46 22
Bevel

KBG2-20L2 10 20 2 7°25' L H1 12 33 40.34 44 46 22

Reduction Normal No. of Number of Bore Hub dia. Pitch dia. Throat dia. Outside dia. Face width
Catalog No. module teeth starts
Helix angle Hand thread Shape
ratio AH7 B C D D' E
KCG2-20R1 20 20 1 3°42' R H1 12 33 40.08 44 46 22
KCG2-20R2 10 20 2 7°25' R H1 12 33 40.34 44 46 22
Other

KCG2-30R1 30 30 1 3°42' R H1 12 40 60.13 64 66 22

KCG2-30R2 15 30 2 7°25' R H1 12 40 60.51 64 66 22
KCG2-40R1 40 40 1 3°42' R H1 12 45 80.17 84 86 22
KCG2-50R1 50 50 1 3°42' R HB 12 48 100.21 104 106 22
KCG2-50R2 25 50 2 7°25' R HB 12 48 100.84 104 106 22
KCG2-60R1 60 60 1 3°42' R HB 12 60 120.25 124 126 22
m2
KCG2-20L1 20 20 1 3°42' L H1 12 33 40.08 44 46 22
KCG2-20L2 10 20 2 7°25' L H1 12 33 40.34 44 46 22
KCG2-30L1 30 30 1 3°42' L H1 12 40 60.13 64 66 22
KCG2-30L2 15 30 2 7°25' L H1 12 40 60.51 64 66 22
KCG2-40L1 40 40 1 3°42' L H1 12 45 80.17 84 86 22
KCG2-50L1 50 50 1 3°42' L HB 12 48 100.21 104 106 22
KCG2-50L2 25 50 2 7°25' L HB 12 48 100.84 104 106 22
KCG2-60L1 60 60 1 3°42' L HB 12 60 120.25 124 126 22
[Caution on Product Characteristics] a Worm Wheels are profile shifted to create the proper center distance.
546 b The allowable torques shown in the table are the calculated values according to the assumed usage conditions. Please see page 510 for more details.
 KSW

Series Steel Worms

Gears
Spur
P Q
S

Helical
Gears
M
N
O
L
W1K

Internal
Gears
Total length Keyway Set screw Weight Catalog No. [Caution on J series]
R Width×Depth Size S (kg) •: J Series (Available-on-request) a As available-on-request products, requires a lead-time for shipping within
— — — 0.20 KSW2-R1 5 working-days (excludes the day ordered), after placing an order. Please
46 4 x 1.8
5 x 2.3
M4
M4
7
7
0.20
0.18
•• KSW2-R1J12
KSW2-R1J14
allow additional shipping time to get to your local distributor.
b Number of products we can process for one order is 1 to 20 units. For quantities of 21
— — — 0.20 KSW2-R2
••

Racks
46 4 x 1.8 M4 7 0.20 KSW2-R2J12 or more pieces, we need to quote price and lead time.
5 x 2.3 M4 7 0.18 KSW2-R2J14 c Keyways are made according to JIS B1301 standards, Js 9 tolerance.
— — — 0.20 KSW2-L1 d Areas of products which have been re-worked will not be black oxide coated.
46 4 x 1.8
5 x 2.3
M4
M4
7
7
0.20
0.18
••KSW2-L1J12
KSW2-L1J14
e For products having a tapped hole, a set screw is included.

CP Racks
& Pinions
— — — 0.20 KSW2-L2
46 4 x 1.8
5 x 2.3
M4
M4
7
7
0.20
0.18
••
KSW2-L2J12
KSW2-L2J14

KBG • KCG

Gears
Miter
Bronze Worm Wheels & Gray Iron Worm Wheels
G
E F

Gears
Bevel
(H)
J

Screw
Gears
D’
D
A
B
C
(I)
CS

CS

HB

Products Gearboxes Gear Pair

* CS has a sand mold casting finish.

Worm
NOTE 1 : Allowable torque for worm revolution (rpm)
Hub width Total length Mounting distance Allowable torque (N·m) NOTE 1 Backlash Weight
Catalog No.
F G J 30 rpm 100 rpm 300 rpm 600 rpm 900 rpm 1200 rpm (mm) (kg)
13 35 35.5 12.3 10.2 8.00 6.59 5.78 5.25 0.10~0.28 0.33 KBG2-20R1
13 35 35.5 12.3 10.0 7.51 6.15 5.32 4.80 0.10~0.28 0.33 KBG2-20R2
13 35 35.5 12.3 10.2 8.00 6.59 5.78 5.25 0.10~0.28 0.33 KBG2-20L1 Bevel
13 35 35.5 12.3 10.0 7.51 6.15 5.32 4.80 0.10~0.28 0.33 KBG2-20L2
NOTE 1 : Allowable torque for worm revolution (rpm)
Hub width Total length Web thickness Web O.D. Mounting distance Allowable torque (N·m) NOTE 1 Backlash Weight
Catalog No.
F G (H) (I) J 30 rpm 100 rpm 300 rpm 600 rpm 900 rpm 1200 rpm (mm) (kg)
13 35 — — 35.5 7.38 6.15 4.80 3.95 3.47 3.15 0.10~0.28 0.27 KCG2-20R1
13 35 — — 35.5 7.40 6.00 4.51 3.69 3.19 2.88 0.10~0.28 0.27 KCG2-20R2
Other

13 35 — — 45.5 15.6 13.1 10.4 8.74 7.70 6.96 0.10~0.28 0.57 KCG2-30R1
13 35 — — 45.5 15.7 13.1 9.96 8.15 7.18 6.45 0.10~0.28 0.57 KCG2-30R2
13 35 — — 55.5 26.7 22.5 18.1 15.4 13.55 12.3 0.10~0.28 0.96 KCG2-40R1
13 35 (7) (88) 65.5 40.3 34.1 27.6 23.6 21.0 19.1 0.10~0.28 1.01 KCG2-50R1
13 35 (7) (88) 65.5 40.7 34.0 26.9 22.4 19.6 17.8 0.10~0.28 1.01 KCG2-50R2
13 35 (7) (108) 75.5 56.4 47.9 38.9 33.3 29.9 27.2 0.10~0.28 1.44 KCG2-60R1
13 35 — — 35.5 7.38 6.15 4.80 3.95 3.47 3.15 0.10~0.28 0.27 KCG2-20L1
13 35 — — 35.5 7.40 6.00 4.51 3.69 3.19 2.88 0.10~0.28 0.27 KCG2-20L2
13 35 — — 45.5 15.6 13.1 10.4 8.74 7.70 6.96 0.10~0.28 0.57 KCG2-30L1
13 35 — — 45.5 15.7 13.1 9.96 8.15 7.18 6.45 0.10~0.28 0.57 KCG2-30L2
13 35 — — 55.5 26.7 22.5 18.1 15.4 13.55 12.3 0.10~0.28 0.96 KCG2-40L1
13 35 (7) (88) 65.5 40.3 34.1 27.6 23.6 21.0 19.1 0.10~0.28 1.01 KCG2-50L1
13 35 (7) (88) 65.5 40.7 34.0 26.9 22.4 19.6 17.8 0.10~0.28 1.01 KCG2-50L2
13 35 (7) (108) 75.5 56.4 47.9 38.9 33.3 29.9 27.2 0.10~0.28 1.44 KCG2-60L1
[Caution on Secondary Operations] a Please read “Caution on Performing Secondary Operations” (Page 512) when performing modifications and/or secondary
operations for safety concerns. 547
 KSW Module 2.5
Steel Worms
Specifications R

Precision grade KHK W 001 grade 4 * P Q

Gears
Spur

Reference
section of gear Normal plane
Gear teeth Standard full depth
Normal
pressure angle 20°

M
N
O
L
Material S45C
Helical
Gears

Heat treatment —
Tooth hardness (less than 194HB) W1
* The precision grade of J Series products is equivalent to the value shown in the table.

Catalog No. Normal Number of Bore Hub dia. Pitch dia. Outside dia. Face width Hub width (R) Hub width (L)
Internal

Lead angle Hand thread Shape

Gears

•: J Series (Available-on-request) module starts LH7 M N O P Q Q'

••
KSW2.5-R1 W1 15
KSW2.5-R1J15 W1K 15
1 3°52' R 30 37 42 45 18 —
•
KSW2.5-R1J16 W1K 16
KSW2.5-R1J17 W1K 17

••
KSW2.5-R2 W1 15
KSW2.5-R2J15 W1K 15 30 37 42 45 18 —
Racks

•
KSW2.5-R2J16 2 7°46' R W1K 16
KSW2.5-R2J17 W1K 17
m2.5

••
KSW2.5-L1 W1 15
KSW2.5-L1J15 W1K 15
1 3°52' L 30 37 42 45 18 —
•
KSW2.5-L1J16 W1K 16
KSW2.5-L1J17 W1K 17
CP Racks
& Pinions

••
KSW2.5-L2 W1 15
KSW2.5-L2J15 W1K 15
2 7°46' L 30 37 42 45 18 —
•
KSW2.5-L2J16 W1K 16
KSW2.5-L2J17 W1K 17
[Caution on Product Characteristics] a These worms produce axial thrust forces. See page 512 for more details.
[Caution on Secondary Operations] a Please read “Caution on Performing Secondary Operations” (Page 512) when performing modifications and/or secondary operations for safety concerns.
b Gear tooth hardening of the worm reduces the precision (introduces errors in the lead and pressure angles). Avoid heat hardening as it will create bad tooth contact causing abrasion of the wheel.
Gears

KBG • KCG Module 2.5

Miter

Bronze Worm Wheels & Gray Iron Worm Wheels KBG KCG

Specifications
Gears
Bevel

Catalog No. KBG KCG

Precision grade KHK W 002 grade 4 KHK W 002 grade 4
Reference
section of gear Normal plane Normal plane
Gear teeth Standard full depth Standard full depth
Normal
Screw

20° 20°
Gears

pressure angle
Material CAC502(formerly JIS PBC2) FC200
Heat treatment — —
Tooth hardness — —
Products Gearboxes Gear Pair
Worm

Reduction Normal No. of Number of Bore Hub dia. Pitch dia. Throat dia. Outside dia. Face width
Catalog No. module teeth starts
Helix angle Hand thread Shape
ratio AH7 B C D D' E
KBG2.5-20R1 20 20 1 3°52' R H1 12 35 50.11 55 57.5 22
KBG2.5-20R2 10 20 2 7°46' R H1 12 35 50.46 55 57.5 22
m2.5
KBG2.5-20L1 20 20 1 3°52' L H1 12 35 50.11 55 57.5 22
KBG2.5-20L2 10 20 2 7°46' L H1 12 35 50.46 55 57.5 22
Bevel

Reduction Normal No. of Number of Bore Hub dia. Pitch dia. Throat dia. Outside dia. Face width
Catalog No. module teeth starts
Helix angle Hand thread Shape
ratio AH7 B C D D' E
KCG2.5-20R1 20 20 1 3°52' R H1 12 35 50.11 55 57.5 22
KCG2.5-20R2 10 20 2 7°46' R H1 12 35 50.46 55 57.5 22
KCG2.5-30R1
Other

30 30 1 3°52' R HB 12 40 75.17 80 82.5 22

KCG2.5-30R2 15 30 2 7°46' R HB 12 40 75.68 80 82.5 22
KCG2.5-40R1 40 40 1 3°52' R HB 15 45 100.23 105 107.5 22
KCG2.5-50R1 50 50 1 3°52' R HB 15 50 125.29 130 132.5 22
KCG2.5-50R2 25 50 2 7°46' R HB 15 50 126.16 130 132.5 22
KCG2.5-60R1 60 60 1 3°52' R HB 15 55 150.34 155 157.5 22
m2.5
KCG2.5-20L1 20 20 1 3°52' L H1 12 35 50.11 55 57.5 22
KCG2.5-20L2 10 20 2 7°46' L H1 12 35 50.46 55 57.5 22
KCG2.5-30L1 30 30 1 3°52' L HB 12 40 75.17 80 82.5 22
KCG2.5-30L2 15 30 2 7°46' L HB 12 40 75.68 80 82.5 22
KCG2.5-40L1 40 40 1 3°52' L HB 15 45 100.23 105 107.5 22
KCG2.5-50L1 50 50 1 3°52' L HB 15 50 125.29 130 132.5 22
KCG2.5-50L2 25 50 2 7°46' L HB 15 50 126.16 130 132.5 22
KCG2.5-60L1 60 60 1 3°52' L HB 15 55 150.34 155 157.5 22
[Caution on Product Characteristics] a Worm Wheels are profile shifted to create the proper center distance.
548 b The allowable torques shown in the table are the calculated values according to the assumed usage conditions. Please see page 510 for more details.
 KSW

Series Steel Worms

R
P Q

Gears
Spur
S

M
N
O
L

Helical
Gears
W1K

Total length Keyway Set screw Weight Catalog No. [Caution on J series]

Internal
Gears
R Width×Depth Size S (kg) •: J Series (Available-on-request) a As available-on-request products, requires a lead-time for shipping within
5 working-days (excludes the day ordered), after placing an order. Please
••
— — — 0.39 KSW2.5-R1
63 5 x 2.3 M4 9 0.39 KSW2.5-R1J15 allow additional shipping time to get to your local distributor.
•
5 x 2.3 M4 9 0.37 KSW2.5-R1J16
5 x 2.3 M4 9 0.36 KSW2.5-R1J17 b Number of products we can process for one order is 1 to 20 units. For quantities of 21

••
— — — 0.39 KSW2.5-R2 or more pieces, we need to quote price and lead time.
63 5 x 2.3 M4 9 0.39 KSW2.5-R2J15 c Keyways are made according to JIS B1301 standards, Js 9 tolerance.

Racks
•
5 x 2.3 M4 9 0.37 KSW2.5-R2J16
5 x 2.3 M4 9 0.36 KSW2.5-R2J17 d Areas of products which have been re-worked will not be black oxide coated.

••
— — — 0.39 KSW2.5-L1 e For products having a tapped hole, a set screw is included.
63 5 x 2.3 M4 9 0.39 KSW2.5-L1J15

•
5 x 2.3 M4 9 0.37 KSW2.5-L1J16
5 x 2.3 M4 9 0.36 KSW2.5-L1J17

CP Racks
& Pinions
••
— — — 0.39 KSW2.5-L2
63 5 x 2.3 M4 9 0.39 KSW2.5-L2J15

•
5 x 2.3 M4 9 0.37 KSW2.5-L2J16
5 x 2.3 M4 9 0.36 KSW2.5-L2J17

KBG • KCG

Gears
Miter
G
E F
G Bronze Worm Wheels & Gray Iron Worm Wheels
E F

Gears
Bevel
(H)
J

D’
D’

D
D

A
B
C
A
B
C

(I)

Screw
Gears
CS

CS

H1 HB
* CS has a sand mold casting finish.

Products Gearboxes Gear Pair

NOTE 1 : Allowable torque for worm revolution (rpm)

Worm
Hub width Total length Mounting distance Allowable torque (N·m) NOTE 1 Backlash Weight
Catalog No.
F G J 30 rpm 100 rpm 300 rpm 600 rpm 900 rpm 1200 rpm (mm) (kg)
14 36 43.5 21.5 17.7 13.8 11.4 9.94 9.07 0.13~0.31 0.49 KBG2.5-20R1
14 36 43.5 21.5 17.3 13.0 10.6 9.14 8.27 0.13~0.31 0.49 KBG2.5-20R2
14 36 43.5 21.5 17.7 13.8 11.4 9.94 9.07 0.13~0.31 0.49 KBG2.5-20L1
14 36 43.5 21.5 17.3 13.0 10.6 9.14 8.27 0.13~0.31 0.49 KBG2.5-20L2
Bevel
NOTE 1 : Allowable torque for worm revolution (rpm)
Hub width Total length Web thickness Web O.D. Mounting distance Allowable torque (N·m) NOTE 1 Backlash Weight
Catalog No.
F G (H) (I) J 30 rpm 100 rpm 300 rpm 600 rpm 900 rpm 1200 rpm (mm) (kg)
14 36 — — 43.5 12.9 10.6 8.30 6.83 5.97 5.44 0.13~0.31 0.40 KCG2.5-20R1
14 36 — — 43.5 12.9 10.4 7.78 6.36 5.49 4.96 0.13~0.31 0.40 KCG2.5-20R2
KCG2.5-30R1
Other

14 36 (10) (60) 56 27.3 22.8 18.0 15.1 13.2 12.0 0.13~0.31 0.70
14 36 (10) (60) 56 27.5 22.5 17.2 14.1 12.3 11.1 0.13~0.31 0.70 KCG2.5-30R2
14 36 (9) (86) 68.5 46.7 39.0 31.3 26.5 23.3 21.2 0.13~0.31 1.02 KCG2.5-40R1
14 36 (9) (110) 81 70.6 59.0 47.8 40.7 36.1 33.0 0.13~0.31 1.46 KCG2.5-50R1
14 36 (9) (110) 81 71.1 58.6 46.4 38.6 33.6 30.7 0.13~0.31 1.46 KCG2.5-50R2
14 36 (9) (136) 93.5 98.8 82.9 67.3 57.6 51.5 47.0 0.13~0.31 1.93 KCG2.5-60R1
14 36 — — 43.5 12.9 10.6 8.30 6.83 5.97 5.44 0.13~0.31 0.40 KCG2.5-20L1
14 36 — — 43.5 12.9 10.4 7.78 6.36 5.49 4.96 0.13~0.31 0.40 KCG2.5-20L2
14 36 (10) (60) 56 27.3 22.8 18.0 15.1 13.2 12.0 0.13~0.31 0.70 KCG2.5-30L1
14 36 (10) (60) 56 27.5 22.5 17.2 14.1 12.3 11.1 0.13~0.31 0.70 KCG2.5-30L2
14 36 (9) (86) 68.5 46.7 39.0 31.3 26.5 23.3 21.2 0.13~0.31 1.02 KCG2.5-40L1
14 36 (9) (110) 81 70.6 59.0 47.8 40.7 36.1 33.0 0.13~0.31 1.46 KCG2.5-50L1
14 36 (9) (110) 81 71.1 58.6 46.4 38.6 33.6 30.7 0.13~0.31 1.46 KCG2.5-50L2
14 36 (9) (136) 93.5 98.8 82.9 67.3 57.6 51.5 47.0 0.13~0.31 1.93 KCG2.5-60L1
[Caution on Secondary Operations] a Please read “Caution on Performing Secondary Operations” (Page 512) when performing modifications and/or secondary
operations for safety concerns. 549
 KSW Module 3
Steel Worms
Specifications R
P Q
Gears

Precision grade KHK W 001 grade 4 *

Spur

Reference
section of gear Normal plane
Gear teeth Standard full depth
Normal
pressure angle 14° 30'

M
N
O
L
Material S45C
Helical
Gears

Heat treatment —
Tooth hardness (less than 194HB)
W1
* The precision grade of J Series products is equivalent to the value shown in the table.

Catalog No. Normal Number of Bore Hub dia. Pitch dia. Outside dia. Face width Hub width (R) Hub width (L)
Internal

Lead angle Hand thread Shape

module starts
Gears

•: J Series (Available-on-request) LH7 M N O P Q Q'

••
KSW3-R1 W1 16
KSW3-R1J17 W1K 17
—
••
KSW3-R1J18 1 3°55' R W1K 18 35 44 50 50 20
KSW3-R1J19 W1K 19
KSW3-R1J20 W1K 20

••
KSW3-R2 W1 16
Racks

KSW3-R2J17 W1K 17
—
••
KSW3-R2J18 2 7°50' R W1K 18 35 44 50 50 20
KSW3-R2J19 W1K 19
KSW3-R2J20 W1K 20
m3

••
KSW3-L1 W1 16
KSW3-L1J17 W1K 17
CP Racks

—
••
KSW3-L1J18
& Pinions

1 3°55' L W1K 18 35 44 50 50 20
KSW3-L1J19 W1K 19
KSW3-L1J20 W1K 20

••
KSW3-L2 W1 16
KSW3-L2J17 W1K 17
—
••
KSW3-L2J18 2 7°50' L W1K 18 35 44 50 50 20
KSW3-L2J19 W1K 19
KSW3-L2J20 W1K 20
[Caution on Product Characteristics] a These worms produce axial thrust forces. See page 512 for more details.
Gears
Miter

KBG • KCG Module 3

Bronze Worm Wheels & Gray Iron Worm Wheels KBG KCG
Gears
Bevel

Specifications
Catalog No. KBG KCG
Precision grade KHK W 002 grade 4 KHK W 002 grade 4
Reference
section of gear Normal plane Normal plane
Screw
Gears

Gear teeth Standard full depth Standard full depth

Normal
pressure angle 14° 30' 14° 30'
Material CAC502(formerly JIS PBC2) FC200
Heat treatment — —
Products Gearboxes Gear Pair

Tooth hardness — —
Worm

Reduction Normal No. of Number of Bore Hub dia. Pitch dia. Throat dia. Outside dia. Face width
Catalog No. module teeth starts
Helix angle Hand thread Shape
ratio AH7 B C D D' E
KBG3-20R1 20 20 1 3°55' R H1 20 50 60.14 66 69 28
KBG3-20R2 10 20 2 7°50' R H1 20 50 60.57 66 69 28
m3
KBG3-20L1 20 20 1 3°55' L H1 20 50 60.14 66 69 28
Bevel

KBG3-20L2 10 20 2 7°50' L H1 20 50 60.57 66 69 28

Reduction Normal No. of Number of Bore Hub dia. Pitch dia. Throat dia. Outside dia. Face width
Catalog No. module teeth starts
Helix angle Hand thread Shape
ratio AH7 B C D D' E
KCG3-20R1 20 20 1 3°55' R H1 20 50 60.14 66 69 28
KCG3-20R2 10 20 2 7°50' R H1 20 50 60.57 66 69 28
Other

KCG3-30R1 30 30 1 3°55' R H1 20 55 90.21 96 99 28

KCG3-30R2 15 30 2 7°50' R H1 20 55 90.85 96 99 28
KCG3-40R1 40 40 1 3°55' R HB 20 55 120.28 126 129 30
KCG3-50R1 50 50 1 3°55' R HB 20 63 150.35 156 159 30
KCG3-50R2 25 50 2 7°50' R HB 20 63 151.41 156 159 30
KCG3-60R1 60 60 1 3°55' R HB 20 70 180.42 186 189 30
m3
KCG3-20L1 20 20 1 3°55' L H1 20 50 60.14 66 69 28
KCG3-20L2 10 20 2 7°50' L H1 20 50 60.57 66 69 28
KCG3-30L1 30 30 1 3°55' L H1 20 55 90.21 96 99 28
KCG3-30L2 15 30 2 7°50' L H1 20 55 90.85 96 99 28
KCG3-40L1 40 40 1 3°55' L HB 20 55 120.28 126 129 30
KCG3-50L1 50 50 1 3°55' L HB 20 63 150.35 156 159 30
KCG3-50L2 25 50 2 7°50' L HB 20 63 151.41 156 159 30
KCG3-60L1 60 60 1 3°55' L HB 20 70 180.42 186 189 30
[Caution on Product Characteristics] a Worm Wheels are profile shifted to create the proper center distance.
550 b The allowable torques shown in the table are the calculated values according to the assumed usage conditions. Please see page 510 for more details.
 KSW

Series Newly added Steel Worms

R
P Q

Gears
Spur
S

M
N
O
L

Helical
Gears
W1K

Total length Keyway Set screw Weight Catalog No. [Caution on J series]

Internal
a As available-on-request products, requires a lead-time for shipping within

Gears
R Width×Depth Size S (kg) •: J Series (Available-on-request)
5 working-days (excludes the day ordered), after placing an order. Please
••
— — — 0.64 KSW3-R1
5 x 2.3 M4 10 0.62 KSW3-R1J17 allow additional shipping time to get to your local distributor.

••
70 6 x 2.8 M5 10 0.60 KSW3-R1J18 b Number of products we can process for one order is 1 to 20 units. For quantities of 21 or
6 x 2.8 M5 10 0.58 KSW3-R1J19
6 x 2.8 M5 10 0.56 KSW3-R1J20 more pieces, we need to quote price and lead time.
c Keyways are made according to JIS B1301 standards, Js 9 tolerance.
••
— — — 0.64 KSW3-R2

Racks
5 x 2.3 M4 10 0.62 KSW3-R2J17 d Areas of products which have been re-worked will not be black oxide coated.
••
70 6 x 2.8 M5 10 0.60 KSW3-R2J18
6 x 2.8 M5 10 0.58 KSW3-R2J19 e For products having a tapped hole, a set screw is included.
6 x 2.8 M5 10 0.56 KSW3-R2J20
[Caution on Secondary Operations]
••
— — — 0.64 KSW3-L1
5 x 2.3 M4 10 0.62 KSW3-L1J17 a Please read “Caution on Performing Secondary Operations” (Page 512) when per-

CP Racks
••
KSW3-L1J18

& Pinions
70 6 x 2.8 M5 10 0.60
6 x 2.8 M5 10 0.58 KSW3-L1J19 forming modifications and/or secondary operations for safety concerns.
6 x 2.8 M5 10 0.56 KSW3-L1J20 b Gear tooth hardening of the worm reduces the precision (introduces errors in the lead

••
— — — 0.64 KSW3-L2 and pressure angles). Avoid heat hardening as it will create bad tooth contact causing
5 x 2.3 M4 10 0.62 KSW3-L2J17
abrasion of the wheel.
••
70 6 x 2.8 M5 10 0.60 KSW3-L2J18
6 x 2.8 M5 10 0.58 KSW3-L2J19
6 x 2.8 M5 10 0.56 KSW3-L2J20

Gears
Miter
KBG • KCG
G G
E F E F Bronze Worm Wheels & Gray Iron Worm Wheels

Gears
Bevel
(H)
J
J

D’
D’

D
A
B
C
D
A
B
C

Screw
(I)

Gears
CS

CS

H1 HB
* CS has a sand mold casting finish.

Products Gearboxes Gear Pair

Worm
NOTE 1 : Allowable torque for worm revolution (rpm)
Hub width Total length Mounting distance Allowable torque (N·m) NOTE 1 Backlash Weight
Catalog No.
F G J 30 rpm 100 rpm 300 rpm 600 rpm 900 rpm 1200 rpm (mm) (kg)
15 43 52 36.8 30.1 23.5 19.1 16.7 15.2 0.15~0.33 0.89 KBG3-20R1
15 43 52 37.0 29.5 22.1 17.9 15.4 14.0 0.15~0.33 0.89 KBG3-20R2
15 43 52 36.8 30.1 23.5 19.1 16.7 15.2 0.15~0.33 0.89 KBG3-20L1
KBG3-20L2
15 43 52 37.0 29.5 22.1 17.9 15.4 14.0 0.15~0.33 0.89
Bevel
NOTE 1 : Allowable torque for worm revolution (rpm)

Hub width Total length Web thickness Web O.D. Mounting distance Allowable torque (N·m) NOTE 1 Backlash Weight
Catalog No.
F G (H) (I) J 30 rpm 100 rpm 300 rpm 600 rpm 900 rpm (mm) (kg)

15 43 — — 52 22.1 18.1 14.1 11.5 10.0 0.15~0.33 0.73 KCG3-20R1

15 43 — — 52 22.2 17.7 13.3 10.7 9.24 0.15~0.33 0.73 KCG3-20R2
Other

15 43 — — 67 46.6 38.7 30.6 25.4 22.2 0.15~0.33 1.50 KCG3-30R1

15 43 — — 67 47.2 38.5 29.3 23.7 20.8 0.15~0.33 1.50 KCG3-30R2
15 45 (9) (107) 82 79.8 66.3 53.2 44.6 39.1 0.15~0.33 1.79 KCG3-40R1
15 45 (9) (138) 97 121 100 81.1 68.4 60.5 0.15~0.33 2.50 KCG3-50R1
15 45 (9) (138) 97 122 100 79.1 65.1 56.7 0.15~0.33 2.50 KCG3-50R2
15 45 (9) (166) 112 169 141 114 96.7 86.3 0.15~0.33 3.40 KCG3-60R1
15 43 — — 52 22.1 18.1 14.1 11.5 10.0 0.15~0.33 0.73 KCG3-20L1
15 43 — — 52 22.2 17.7 13.3 10.7 9.24 0.15~0.33 0.73 KCG3-20L2
15 43 — — 67 46.6 38.7 30.6 25.4 22.2 0.15~0.33 1.50 KCG3-30L1
15 43 — — 67 47.2 38.5 29.3 23.7 20.8 0.15~0.33 1.50 KCG3-30L2
15 45 (9) (107) 82 79.8 66.3 53.2 44.6 39.1 0.15~0.33 1.79 KCG3-40L1
15 45 (9) (138) 97 121 100 81.1 68.4 60.5 0.15~0.33 2.50 KCG3-50L1
15 45 (9) (138) 97 122 100 79.1 65.1 56.7 0.15~0.33 2.50 KCG3-50L2
15 45 (9) (166) 112 169 141 114 96.7 86.3 0.15~0.33 3.40 KCG3-60L1
[Caution on Secondary Operations] a Please read “Caution on Performing Secondary Operations” (Page 512) when performing modifications and/or secondary operations for safety concerns.
551
 KSW Module 4
Steel Worms
Specifications R
P Q
Gears

Precision grade KHK W 001 grade 4

Spur

Reference
section of gear Normal plane
Gear teeth Standard full depth
Normal
14° 30'

M
N
O
L
pressure angle
Helical
Gears

Material S45C
Heat treatment —
W1
Tooth hardness (less than 194HB)
Internal
Gears

Normal Number of Bore Hub dia. Pitch dia. Outside dia. Face width Hub width (R) Hub width (L)
Catalog No. module starts
Lead angle Hand thread Shape
LH7 M N O P Q Q'
KSW4-R1
m4
1 3°42' R W1 22 50 62 70 70 25 —
KSW4-R2 2 7°25' R W1 22 50 62 70 70 25 —
KSW4-L1
m4
1 3°42' L W1 22 50 62 70 70 25 —
KSW4-L2 2 7°25' L W1 22 50 62 70 70 25 —
Racks

[Caution on Product Characteristics] a These worms produce axial thrust forces. See page 512 for more details.
CP Racks
& Pinions

KBG • KCG Module 4

Bronze Worm Wheels & Gray Iron Worm Wheels BG CG
Gears
Miter

G
Specifications E F
Catalog No. BG CG
Precision grade KHK W 002 grade 4 KHK W 002 grade 4
Reference
Normal plane Normal plane

J
section of gear
Gears
Bevel

Gear teeth Standard full depth Standard full depth

D’
Normal
14° 30' 14° 30'

D
A
B
C
pressure angle
Material CAC502(formerly JIS PBC2) FC200
Heat treatment — —
Screw
Gears

H1
Tooth hardness — —

Reduction Normal No. of Number of Bore Hub dia. Pitch dia. Throat dia. Outside dia. Face width
Catalog No. module teeth starts
Helix angle Hand thread Shape
ratio AH7 B C D D' E
Products Gearboxes Gear Pair

KBG4-20R1 20 20 1 3°42' R H1 20 60 80.17 88 90 35

Worm

KBG4-20R2 10 20 2 7°25' R H1 20 60 80.67 88 90 35

m4
KBG4-20L1 20 20 1 3°42' L H1 20 60 80.17 88 90 35
KBG4-20L2 10 20 2 7°25' L H1 20 60 80.67 88 90 35

Reduction Normal No. of Number of Bore Hub dia. Pitch dia. Throat dia. Outside dia. Face width
Catalog No. module teeth starts
Helix angle Hand thread Shape
ratio AH7 B C D D' E
Bevel

KCG4-20R1 20 20 1 3°42' R H1 20 60 80.17 88 90 35

KCG4-20R2 10 20 2 7°25' R H1 20 60 80.67 88 90 35
KCG4-30R1 30 30 1 3°42' R HB 20 60 120.25 128 130 35
KCG4-30R2 15 30 2 7°25' R HB 20 60 121.01 128 130 35
KCG4-40R1 40 40 1 3°42' R HB 20 70 160.33 168 171 35
KCG4-50R1 50 50 1 3°42' R H2 20 70 200.42 208 211 35
Other

KCG4-50R2 25 50 2 7°25' R H2 20 70 201.69 208 211 35

KCG4-60R1 60 60 1 3°42' R H2 20 80 240.5 248 251 35
m4
KCG4-20L1 20 20 1 3°42' L H1 20 60 80.17 88 90 35
KCG4-20L2 10 20 2 7°25' L H1 20 60 80.67 88 90 35
KCG4-30L1 30 30 1 3°42' L HB 20 60 120.25 128 130 35
KCG4-30L2 15 30 2 7°25' L HB 20 60 120.01 128 130 35
KCG4-40L1 40 40 1 3°42' L HB 20 70 160.33 168 171 35
KCG4-50L1 50 50 1 3°42' L H2 20 70 200.42 208 211 35
KCG4-50L2 25 50 2 7°25' L H2 20 70 201.69 208 211 35
KCG4-60L1 60 60 1 3°42' L H2 20 80 240.5 248 251 35

[Caution on Product Characteristics] a Worm Wheels are profile shifted to create the proper center distance.
b H2 Shape Worm Gears have elongated casting holes in the web (H).
c The allowable torques shown in the table are the calculated values according to the assumed usage conditions. Please see page 510 for more details.

552
 KSW

Steel Worms

Gears
Spur
 For products not categorized in our Stock Gear series', custom gear
production services with short lead times is available. For details see page VI.

Helical
Gears
Internal
Gears
Total length Set screw Weight
Catalog No.
R Size S (kg)
95 — — 1.76 KSW4-R1
95 — — 1.76 KSW4-R2
95 — — 1.76 KSW4-L1
95 — — 1.76 KSW4-L2

Racks
[Caution on Secondary Operations] a Please read “Caution on Performing Secondary Operations” (Page 512) when performing modifications and/or secondary operations for safety concerns.
b Gear tooth hardening of the worm reduces the precision (introduces errors in the lead and pressure angles). Avoid heat hardening as it will create bad tooth contact
causing abrasion of the wheel.

CP Racks
& Pinions
KBG • KCG

Bronze Worm Wheels & Gray Iron Worm Wheels

Gears
Miter
G G
E F E F

(H) （H）
J

Gears
Bevel
D’

D’
D
A
B
C

D
A
B
C
(I)

(I)
CS
CS

Screw
CS

Gears
CS

HB H2
* CS has a sand mold casting finish.
NOTE 1 : Allowable torque for worm revolution (rpm)
Hub width Total length Mounting distance Allowable torque (N·m) NOTE 1 Backlash Weight
Catalog No.
F G J 30 rpm 100 rpm 300 rpm 600 rpm 900 rpm 1200 rpm (mm) (kg)

Products Gearboxes Gear Pair

17 52 71 75.9 61.7 47.9 38.4 33.7 30.1 0.17~0.37 1.91 KBG4-20R1

Worm
17 52 71 75.9 60.0 44.8 35.7 30.9 27.5 0.17~0.37 1.91 KBG4-20R2
17 52 71 75.9 61.7 47.9 38.4 33.7 30.1 0.17~0.37 1.91 KBG4-20L1
17 52 71 75.9 60.0 44.8 35.7 30.9 27.5 0.17~0.37 1.91 KBG4-20L2
NOTE 1 : Allowable torque for worm revolution (rpm)
Hub width Total length Web thickness Web O.D. Mounting distance Allowable torque (N·m) NOTE 1 Backlash Weight
Catalog No.
F G (H) (I) J 30 rpm 100 rpm 300 rpm 600 rpm (mm) (kg)
Bevel
17 52 — — 71 45.6 37.0 28.7 23.0 0.17~0.37 1.56 KCG4-20R1
17 52 — — 71 45.5 36.0 26.9 21.4 0.17~0.37 1.56 KCG4-20R2
17 52 (12) (96) 91 96.3 79.1 62.3 50.9 0.17~0.37 2.52 KCG4-30R1
17 52 (12) (96) 91 96.8 78.3 59.4 47.3 0.17~0.37 2.52 KCG4-30R2
17 52 (11) (136) 111 165 136 108 89.4 0.17~0.37 3.81 KCG4-40R1
17 52 (12) (176) 131 249 205 165 137 0.17~0.37 4.78 KCG4-50R1
Other

17 52 (12) (176) 131 250 204 160 130 0.17~0.37 4.78 KCG4-50R2
17 52 (12) (218) 151 348 288 233 194 0.17~0.37 6.36 KCG4-60R1
17 52 — — 71 45.6 37.0 28.7 23.0 0.17~0.37 1.56 KCG4-20L1
17 52 — — 71 45.5 36.0 26.9 21.4 0.17~0.37 1.56 KCG4-20L2
17 52 (12) (96) 91 96.3 79.1 62.3 50.9 0.17~0.37 2.52 KCG4-30L1
17 52 (12) (96) 91 96.8 78.3 59.4 47.3 0.17~0.37 2.52 KCG4-30L2
17 52 (11) (136) 111 165 136 108 89.4 0.17~0.37 3.81 KCG4-40L1
17 52 (12) (176) 131 249 205 165 137 0.17~0.37 4.78 KCG4-50L1
17 52 (12) (176) 131 250 204 160 130 0.17~0.37 4.78 KCG4-50L2
17 52 (12) (218) 151 348 288 233 194 0.17~0.37 6.36 KCG4-60L1
[Caution on Secondary Operations] a Please read “Caution on Performing Secondary Operations” (Page 512) when performing modifications
and/or secondary operations for safety concerns.

553
 KSW Module 5, 6
Steel Worms
Specifications R
Q’ P Q
Gears

Precision grade KHK W 001 grade 4

Spur

Reference
section of gear Normal plane
Gear teeth Standard full depth
Normal
14° 30'

M
N
O
L
pressure angle
Helical
Gears

Material S45C
Heat treatment —
W3
Tooth hardness (less than 194HB)
Internal
Gears

Normal Number of Bore Hub dia. Pitch dia. Outside dia. Face width Hub width (R) Hub width (L)
Catalog No. module starts
Lead angle Hand thread Shape
LH7 M N O P Q Q'
KSW5-R1 1 4°06' R W3 25 56 70 80 85 20 20
m5
KSW5-R2 2 8°13' R W3 25 56 70 80 85 20 20
KSW6-R1 1 4°18' R W3 30 64 80 92 100 25 25
m6
KSW6-R2 2 8°38' R W3 30 64 80 92 100 25 25
Racks

[Caution on Product Characteristics] a These worms produce axial thrust forces. See page 512 for more details.
CP Racks
& Pinions

KBG • KCG Module 5, 6

Bronze Worm Wheels & Gray Iron Worm Wheels KBG KCG
Gears

G
Miter

Specifications E F
Catalog No. KBG KCG
Precision grade KHK W 002 grade 4 KHK W 002 grade 4
Reference
Normal plane Normal plane

J
section of gear
Gears
Bevel

Gear teeth Standard full depth Standard full depth

D’
Normal
14° 30' 14° 30'

D
A
B
C
pressure angle
Material CAC502(formerly JIS PBC2) FC200
Heat treatment — —
H1
Screw
Gears

Tooth ardness — —

Reduction Normal No. of Number of Bore Hub dia. Pitch dia. Throat dia. Outside dia. Face width
Catalog No. module teeth starts
Helix angle Hand thread Shape
ratio AH7 B C D D' E
KBG5-20R1 20 20 1 4°06' R H1 22 75 100.26 110 113 45
Products Gearboxes Gear Pair

m5
KBG5-20R2 10 20 2 8°13' R H1 22 75 101.04 110 113 45
Worm

KBG6-20R1 20 20 1 4°18' R H1 25 100 120.34 132 136 52

m6
KBG6-20R2 10 20 2 8°38' R H1 25 100 121.38 132 136 52

Reduction Normal No. of Number of Bore Hub dia. Pitch dia. Throat dia. Outside dia. Face width
Catalog No. module teeth starts
Helix angle Hand thread Shape
ratio AH7 B C D D' E
Bevel

KCG5-20R1 20 20 1 4°06' R H1 22 75 100.26 110 113 45

KCG5-20R2 10 20 2 8°13' R H1 22 75 101.04 110 113 45
KCG5-30R1 30 30 1 4°06' R HB 22 75 150.38 160 163 45
KCG5-30R2 15 30 2 8°13' R HB 22 75 151.56 160 163 45
KCG5-40R1 40 m5 40 1 4°06' R H2 22 90 200.51 210 213 45
KCG5-50R1 50 50 1 4°06' R H2 22 90 250.61 260 263 45
Other

KCG5-50R2 25 50 2 8°13' R H2 22 90 252.59 260 263 45

KCG5-60R1 60 60 1 4°06' R H2 22 100 300.77 310 313 45
KCG6-20R1 20 20 1 4°18' R H1 25 100 120.34 132 136 52
KCG6-20R2 10 20 2 8°38' R H1 25 100 121.38 132 136 52
KCG6-30R1 30 30 1 4°18' R HB 25 100 180.51 192 196 52
KCG6-30R2 15 30 2 8°38' R HB 25 100 182.06 192 196 52
KCG6-40R1 40 m6 40 1 4°18' R H2 25 100 240.68 252 256 52
KCG6-50R1 50 50 1 4°18' R H2 25 100 300.85 312 316 52
KCG6-50R2 25 50 2 8°38' R H2 25 100 303.44 312 316 52
KCG6-60R1 60 60 1 4°18' R H2 25 120 361.02 372 376 52
[Caution on Product Characteristics] a Worm Wheels are profile shifted to create the proper center distance.
b H2 Shape Worm Gears have elongated casting holes in the web (H).
c The allowable torques shown in the table are the calculated values according to the assumed usage conditions. Please see page 510 for more details.

554
 KSW

Steel Worms

Gears
Spur
 For products not categorized in our Stock Gear series', custom gear
production services with short lead times is available. For details see page VI.

Helical
Gears
Internal
Gears
Total length Set screw Weight
Catalog No.
R Size S (kg)
125 — — 2.86 KSW5-R1
125 — — 2.86 KSW5-R2
150 — — 4.38 KSW6-R1
150 — — 4.38 KSW6-R2

Racks
[Caution on Secondary Operations] a Please read “Caution on Performing Secondary Operations” (Page 512) when performing modifications and/or secondary operations for safety concerns.
b Gear tooth hardening of the worm reduces the precision (introduces errors in the lead and pressure angles). Avoid heat hardening as it will create bad tooth contact
causing abrasion of the wheel.

CP Racks
& Pinions
KBG • KCG

Bronze Worm Wheels & Gray Iron Worm Wheels

Gears
Miter
G G
E F E F

(H) （H）
J

Gears
Bevel
D’

D’
D
A
B
C

D
A
B
C
(I)

(I)
CS
CS

CS

CS

HB H2

Screw
Gears
* CS has a sand mold casting finish.
NOTE 1 : Allowable torque for worm revolution (rpm)
Hub width Total length Mounting distance Allowable torque (N·m) NOTE 1 Backlash Weight
Catalog No.
F G J 30 rpm 100 rpm 300 rpm 600 rpm 900 rpm 1200 rpm (mm) (kg)
20 65 85 146 117 91.2 73.0 63.7 56.9 0.20~0.40 3.89 KBG5-20R1

Products Gearboxes Gear Pair

20 65 85 146 115 85.8 68.4 58.8 52.2 0.20~0.40 3.89 KBG5-20R2

Worm
20 72 100 232 185 144 115 99.2 88.8 0.22~0.42 6.60 KBG6-20R1
20 72 100 235 183 136 109 92.3 82.0 0.22~0.42 6.60 KBG6-20R2
NOTE 1 : Allowable torque for worm revolution (rpm)
Hub width Total length Web thickness Web O.D. Mounting distance Allowable torque (N·m) NOTE 1 Backlash Weight
Catalog No.
F G (H) (I) J 30 rpm 100 rpm 300 rpm 600 rpm (mm) (kg) Bevel
20 65 — — 85 87.4 70.3 54.7 43.8 0.20~0.40 3.18 KCG5-20R1
20 65 — — 85 87.9 68.9 51.5 41.0 0.20~0.40 3.18 KCG5-20R2
20 65 (13) (127) 110 185 150 119 96.8 0.20~0.40 4.78 KCG5-30R1
20 65 (13) (127) 110 187 150 114 90.6 0.20~0.40 4.78 KCG5-30R2
20 65 (16) (172) 135 316 258 206 170 0.20~0.40 7.44 KCG5-40R1
20 65 (16) (223) 160 477 390 315 261 0.20~0.40 9.79 KCG5-50R1
Other

20 65 (16) (223) 160 483 390 307 249 0.20~0.40 9.79 KCG5-50R2
20 65 (13) (276) 185 668 548 443 369 0.20~0.40 12.0 KCG5-60R1
20 72 — — 100 139 111 86.2 — 0.22~0.42 5.39 KCG6-20R1
20 72 — — 100 141 110 81.8 — 0.22~0.42 5.39 KCG6-20R2
20 72 (15) (155) 130 294 237 187 — 0.22~0.42 8.28 KCG6-30R1
20 72 (15) (155) 130 299 238 181 — 0.22~0.42 8.28 KCG6-30R2
20 72 (15) (213) 160 502 407 325 — 0.22~0.42 10.9 KCG6-40R1
20 72 (16) (275) 190 760 615 496 — 0.22~0.42 14.0 KCG6-50R1
20 72 (16) (275) 190 774 620 488 — 0.22~0.42 14.0 KCG6-50R2
20 72 (17) (336) 220 1060 865 698 — 0.22~0.42 19.8 KCG6-60R1
[Caution on Secondary Operations] a Please read “Caution on Performing Secondary Operations” (Page 512) when performing modifications
and/or secondary operations for safety concerns.

555
 KSUW Module 0.5, 0.8
Stainless Steel Worms
Specifications
R
Gears

Precision grade KHK W 001 grade 4

Spur

Reference S
section of gear Normal plane
Gear teeth Standard full depth
Normal
pressure angle 20°

N
O
L
Helical

Material SUS303
Gears

Heat treatment —
Tooth hardness (less than 187HB)
W2
Internal
Gears

Normal Number of Bore Hub dia. Pitch dia. Outside dia. Face width Hub width Total length
Catalog No. module starts
Lead angle Hand thread Shape
LH8 M N O P Q R
KSUW0.5-R1 m0.5
1 2°36' R W2 5 — 11 12 — — 18
KSUW0.5-R2 2 5°13' R W2 5 — 11 12 — — 18
KSUW0.8-R1 m0.8
1 3°17' R W2 6 — 14 15.6 — — 30
Racks

KSUW0.8-R2 2 6°34' R W2 6 — 14 15.6 — — 30

[Caution on Product Characteristics] a For W2-shaped products, a set screw is included. When setting up the mating wheel, make sure no friction occurs within the
set screw.
b These worms produce axial thrust forces. See page 512 for more details.
CP Racks
& Pinions

KDG Module 0.5, 0.8

Gears
Miter

Plastic Worm Wheels

Specifications
G
Gears
Bevel

Precision grade KHK W 002 grade 5 E F

Reference
section of gear Normal plane
Gear teeth Standard full depth
J

Normal
pressure angle 20°

D’
A
B
C
Screw
Gears

Material Polyacetal
Heat treatment —
Tooth hardness — HA
Products Gearboxes Gear Pair
Worm

Reduction Normal No. of Number of Bore Hub dia. Pitch dia. Throat dia. Outside dia. Face width
Catalog No. module teeth starts
Helix angle Hand thread Shape
ratio A -- 0.05
0.10 B C D D' E
KDG0.5-20R1 20 20 1 2°36' R HA 4 9 10.01 — 11 5
KDG0.5-20R2 10 20 2 5°13' R HA 4 9 10.04 — 11 5
KDG0.5-30R1 30 30 1 2°36' R HA 4 12 15.02 — 16 5
Bevel

KDG0.5-30R2 15 m0.5 30 2 5°13' R HA 4 12 15.06 — 16 5

KDG0.5-40R1 40 40 1 2°36' R HA 5 15 20.02 — 21 5
KDG0.5-50R1 50 50 1 2°36' R HA 5 20 25.03 — 26 5
KDG0.5-60R1 60 60 1 2°36' R HA 5 25 30.03 — 31 5
Other

KDG0.8-20R1 20 20 1 3°17' R HA 5 12 16.03 — 17.6 9

KDG0.8-20R2 10 20 2 6°34' R HA 5 12 16.11 — 17.6 9
KDG0.8-30R1 30 30 1 3°17' R HA 5 18 24.04 — 25.6 9
KDG0.8-30R2 15 m0.8 30 2 6°34' R HA 5 18 24.16 — 25.6 9
KDG0.8-40R1 40 40 1 3°17' R HA 6 20 32.05 — 33.6 9
KDG0.8-50R1 50 50 1 3°17' R HA 8 25 40.07 — 41.6 9
KDG0.8-60R1 60 60 1 3°17' R HA 8 25 48.08 — 49.6 9
[Caution on Product Characteristics] a Worm Wheels are profile shifted to create the proper center distance.
b The allowable torques shown in the table are the calculated values according to the assumed usage conditions. Please see
page 510 for more details.
c Since the bore is finished with a minus tolerance, you can use a shaft with a force fit.

556
 KSUW

Stainless Steel Worms

Gears
Spur
 For products not categorized in our Stock Gear series', custom gear
production services with short lead times is available. For details see page VI.

Helical
Gears
Internal
Gears
Set Screw Weight
Catalog No.
Size S (kg)

M3 3 0.010 KSUW0.5-R1
M3 3 0.010 KSUW0.5-R2
M4 5 0.029 KSUW0.8-R1

Racks
M4 5 0.029 KSUW0.8-R2
[Caution on Secondary Operations] a Please read “Caution on Performing Secondary Operations” (Page 512) when performing modifications
and/or secondary operations for safety concerns.

CP Racks
& Pinions
KDG

Gears
Miter
Plastic Worm Wheels

Gears
Bevel
Screw
Gears
Products Gearboxes Gear Pair
Worm
Hub width Total length Mounting distance Allowable torque (N·m) Allowable torque kgf·m) Backlash Weight
Catalog No.
F G J Bending strength Bending strength (mm) (g)

7 12 10.5 0.067 0.0068 0~0.16 1.01 KDG0.5-20R1

7 12 10.5 0.067 0.0069 0~0.16 1.01 KDG0.5-20R2
7 12 13 0.11 0.011 0~0.16 2.21 KDG0.5-30R1 Bevel
7 12 13 0.11 0.011 0~0.16 2.21 KDG0.5-30R2
7 12 15.5 0.16 0.016 0~0.16 3.72 KDG0.5-40R1
7 12 18 0.21 0.022 0~0.16 6.36 KDG0.5-50R1
7 12 20.5 0.26 0.027 0~0.16 9.67 KDG0.5-60R1
Other

9 18 15 0.31 0.031 0.04~0.22 3.73 KDG0.8-20R1

9 18 15 0.31 0.032 0.04~0.22 3.73 KDG0.8-20R2
9 18 19 0.52 0.053 0.04~0.22 8.84 KDG0.8-30R1
9 18 19 0.52 0.053 0.04~0.22 8.84 KDG0.8-30R2
9 18 23 0.74 0.076 0.04~0.22 14.0 KDG0.8-40R1
9 18 27 0.98 0.10 0.04~0.22 21.6 KDG0.8-50R1
9 18 31 1.21 0.12 0.04~0.22 28.8 KDG0.8-60R1
[Caution on Secondary Operations] a Please read “Caution on Performing Secondary Operations” (Page 512) when performing modifications
and/or secondary operations for safety concerns.

557
 KSUW Module 1, 1.5
Stainless Steel Worms
Specifications
R
Gears

Precision grade KHK W 001 grade 4 *

Spur

Reference S
section of gear Normal plane
Gear teeth Standard full depth
Normal
20°

N
O
L
pressure angle
Helical
Gears

Material SUS303
Heat treatment —
Tooth hardness (less than 187HB)
W2
* The precision grade of J Series products is equivalent
to the value shown in the table.
Internal
Gears

Catalog No. Norma mod- Number of Bore Hub dia. Pitch dia. Outside dia. Face width Hub width Total length
Lead angle Hand thread Shape
•: J Series (Available-on-request) ule starts LH7 M N O P Q R
KSUW1-R1 1 3°35' R W2 6 — 16 18 — — 32
m1
KSUW1-R2 2 7°11' R W2 6 — 16 18 — — 32
KSUW1.5-R1 W1 8
Racks

• KSUW1.5-R1J8 1 3°26' R W1T 8 20 25 28 30 10 40

• KSUW1.5-R1J10
KSUW1.5-R2
m1.5
W1K
W1
10
8
• KSUW1.5-R2J8 2 6°54' R W1T 8 20 25 28 30 10 40
•
CP Racks
& Pinions

KSUW1.5-R2J10 W1K 10
[Caution on Product Characteristics] a For W2-shaped products, a set screw is included. When setting up the mating wheel, make sure no friction occurs within the
set screw.
b These worms produce axial thrust forces. See page 512 for more details.
c If bore size is less than ø4, the tolerance is H8. If bore size is ø5 or ø6, and the hole length exceeds 3 times the diameter, the
tolerance is also H8.
Gears
Miter

KPG Module 1, 1.5

Plastic Worm Wheels
G
Specifications E F
Gears
Bevel

Precision grade KHK W 002 grade 5 *

Reference
section of gear Normal plane
Gear teeth Standard full depth
J

Normal
pressure angle 20°
Screw
Gears

D’
Material MC901 Nylon

D
A
B
C
Heat treatment —
Tooth hardness —
H1
* The precision grade of this product is equivalent to
Products Gearboxes Gear Pair

the value shown in the table.

Worm

Reduction Normal No. of Number of Bore Hub dia. Pitch dia. Throat dia. Outside dia. Face width
Catalog No. module teeth starts
Helix angle Hand thread Shape
ratio A B C D D' E
KPG1-20R1 20 20 1 3°35' R H1 6 16 20.04 22 23 10
KPG1-20R2 10 20 2 7°11' R H1 6 16 20.16 22 23 10
KPG1-30R1 30 m1 30 1 3°35' R H1 6 20 30.06 32 33 10
Bevel

KPG1-40R1 40 40 1 3°35' R H1 8 26 40.08 42 43 10

KPG1-50R1 50 50 1 3°35' R H1 8 30 50.1 52 53 10
KPG1.5-20R1 20 20 1 3°26' R H1 8 22 30.05 33 34.5 12
m1.5
KPG1.5-20R2 10 20 2 6°54' R H1 8 22 30.22 33 34.5 12
Other

[Caution on Product Characteristics] a Worm Wheels are profile shifted to create the proper center distance.
b Significant variations in temperature or humidity can cause dimensional changes in plastic gears (MC Nylon gears), for bore
size (H8 when produced), teeth diameter, and backlash.
c The allowable torques shown in the table are the calculated values according to the assumed usage conditions. Please see
page 510 for more details.

* In regards to MC Nylon gears, other materials are available for plastic gears, including Ultra High
Molecular Weight Polyethylene (UHMW-PE), which has excellent abrasion resistance. Poly Ether Ether
Ketone (PEEK) also has quality properties. A single piece order is acceptable and will be produced as
a custom-made gear. For details on quotations and orders please see page VI.
558
 KSUW

Series Stainless Steel Worms

R R R

Gears
Spur
P Q P Q P Q
S S

Helical
Gears
M
M

M
N
O
N
O

N
O
L
L

L
W1 W1T W1K

Internal
Gears
Keyway Set screw Weight Catalog No. [Caution on J series]
Width×Depth Size S (kg) •: J Series (Available-on-request) a As available-on-request products, requires a lead-time for shipping within
5 working-days (excludes the day ordered), after placing an order.
— M4 5 0.042 KSUW1-R1
Please allow additional shipping time to get to your local distributor.
— M4 5 0.042 KSUW1-R2 b Number of products we can process for one order is 1 to 20 units. For quantities of
— — — 0.12 KSUW1.5-R1 21 or more pieces, we need to quote price and lead time.

Racks
— M5 5 0.12 •KSUW1.5-R1J8 c Keyways are made according to JIS B1301 standards, Js 9 tolerance.
4 x 1.8
—
M4
—
5
—
0.11
0.12
•KSUW1.5-R1J10
KSUW1.5-R2
d For products having a tapped hole, a set screw is included.

— M5 5 0.12 •KSUW1.5-R2J8
•

CP Racks
& Pinions
4 x 1.8 M4 5 0.11 KSUW1.5-R2J10
[Caution on Secondary Operations] a Please read “Caution on Performing Secondary Operations” (Page 512) when performing modifications and/or secondary
operations for safety concerns.

Gears
Miter
KPG

Plastic Worm Wheels

Gears
Bevel
Screw
Gears
Products Gearboxes Gear Pair
Worm
Hub width Total length Mounting distance Allowable torque (N·m) Allowable torque kgf·m) Backlash Weight
Catalog No.
F G J Bending strength Bending strength (mm) (kg)

10 20 18 0.62 0.060 0~0.28 0.0058 KPG1-20R1

10 20 18 0.62 0.060 0~0.28 0.0058 KPG1-20R2
10 20 23 1.03 0.10 0~0.28 0.012 KPG1-30R1 Bevel
10 20 28 1.49 0.15 0~0.28 0.021 KPG1-40R1
10 20 33 1.96 0.20 0~0.28 0.031 KPG1-50R1
10 22 27.5 1.66 0.17 0~0.30 0.014 KPG1.5-20R1
10 22 27.5 1.68 0.17 0~0.30 0.014 KPG1.5-20R2
Other

[Caution on Secondary Operations] a Please read “Caution on Performing Secondary Operations” (Page 512) when performing modifications
and/or secondary operations for safety concerns.
b Plastic gears are susceptible to the effects of temperature and moisture. Dimensional changes may occur
while performing secondary operations and during post-machining operations.

559
 KSUW Module 2, 2.5, 3
Stainless Steel Worms
Specifications
R
Precision grade KHK W 001 grade 4*
Gears
Spur

P Q
Reference
section of gear Normal plane
Gear teeth Standard full depth
Normal
pressure angle 14° 30'*
Material SUS303

M
N
O
L
Helical
Gears

Heat treatment —
Tooth hardness (less than 187HB)

* The precision grade of J Series products is equivalent to the value shown in the table. W1
* The pressure angle is at 20 degrees for module 2.5.
Internal

Catalog No. Bore Hub dia. Pitch dia. Outside dia. Face width Hub width Total length
Gears

Normal Number of
Lead angle Hand thread Shape
•: J Series (Available-on-request) module starts LH7 M N O P Q R
KSUW2-R1 W1 12
• KSUW2-R1J12 1 3°42' R W1K 12 25 31 35 32 14 46
• KSUW2-R1J14
KSUW2-R2
m2
W1K
W1
14
12
•
Racks

KSUW2-R2J12 W1K 12 25 31 35 32 14 46
• KSUW2-R2J14
KSUW2.5-R1
2 7°25' R
W1K
W1
14
15
• KSUW2.5-R1J15 W1K 15
• KSUW2.5-R1J16
1 3°52' R
W1K 16
30 37 42 45 18 63
CP Racks
& Pinions

• KSUW2.5-R1J17
KSUW2.5-R2
m2.5
W1K
W1
17
15
• KSUW2.5-R2J15 W1K 15
• KSUW2.5-R2J16
2 7°46' R
W1K 16
30 37 42 45 18 63

• KSUW2.5-R2J17
KSUW3-R1
W1K
W1
17
16
Gears

•
Miter

KSUW3-R1J17 W1K 17
• KSUW3-R1J18 1 3°55' R W1K 18 35 44 50 50 20 70
• KSUW3-R1J19 W1K 19
• KSUW3-R1J20
KSUW3-R2
m3
W1K
W1
20
16
•
Gears
Bevel

KSUW3-R2J17 W1K 17
• KSUW3-R2J18 2 7°50' R W1K 18 35 44 50 50 20 70
• KSUW3-R2J19 W1K 19
• KSUW3-R2J20 W1K 20

KPG Module 2, 2.5, 3

Screw
Gears

Plastic Worm Wheels

Specifications
Products Gearboxes Gear Pair
Worm

Precision grade KHK W 002 grade 5

Reference
section of gear Normal plane
Gear teeth Standard full depth
Normal
pressure angle 14° 30'*
Material MC901 Nylon
Bevel

Heat treatment —
Tooth hardness —
* The pressure angle is at 20 degrees for module 2.5.

Reduction Normal No. of Number of Bore Hub dia. Pitch dia. Throat dia. Outside dia. Face width
Catalog No. Helix angle Hand thread Shape
Other

ratio module teeth starts A B C D D' E

KPG2-20R1 20 20 1 3°42' R H1 10 33 40.08 44 46 22
m2
KPG2-20R2 10 20 2 7°25' R H1 10 33 40.34 44 46 22
KPG2.5-20R1 20 20 1 3°52' R H1 12 35 50.11 55 57.5 22
m2.5
KPG2.5-20R2 10 20 2 7°46' R H1 12 35 50.46 55 57.5 22
KPG3-20R1 20 20 1 3°55' R H1 15 50 60.14 66 69 28
m3
KPG3-20R2 10 20 2 7°50' R H1 15 50 60.57 66 69 28
[Caution on Product Characteristics] a Worm Wheels are profile shifted to create the proper center distance.
b Significant variations in temperature or humidity can cause dimensional changes in plastic gears (MC Nylon gears), for bore size (H8 when
produced), teeth diameter, and backlash.
c The allowable torques shown in the table are the calculated values according to the assumed usage conditions. Usage above the value in brack-
ets will exceed the maximum allowable sliding speed, if no lubrication is applied. So, lubrication is required. Please see page 510 for more details.

560
 KSUW

Series Stainless Steel Worms

R
P Q

Gears
Spur
S

M
N
O
L

Helical
Gears
W1K

[Caution on J series]

Internal
Keyway Set screw Weight Catalog No.

Gears
Width×Depth Size S (kg) •: J Series (Available-on-request) a As available-on-request products, requires a lead-time for shipping within 5 working-days
— — — 0.20 KSUW2-R1 (excludes the day ordered), after placing an order. Please allow additional shipping time to
4 x 1.8 M4 7 0.20 • KSUW2-R1J12 get to your local distributor.
5 x 2.3
—
M4
—
7
—
0.18
0.20
• KSUW2-R1J14
KSUW2-R2
b Number of products we can process for one order is 1 to 20 units. For quantities of 21 or more pieces,
we need to quote price and lead time.

Racks
c Keyways are made according to JIS B1301 standards, Js 9 tolerance.
4 x 1.8 M4 7 0.20 KSUW2-R2J12
5 x 2.3
—
M4
—
7
—
0.18
0.39
• KSUW2-R2J14
KSUW2.5-R1
d For products having a tapped hole, a set screw is included.

[Caution on Product Characteristics]

5 x 2.3 M4 9 0.38 • KSUW2.5-R1J15
•
a These worms produce axial thrust forces. See page 512 for more details.
5 x 2.3 M4 9 0.37 KSUW2.5-R1J16

CP Racks
& Pinions
5 x 2.3
—
M4
—
9
—
0.36
0.39
• KSUW2.5-R1J17
KSUW2.5-R2
[Caution on Secondary Operations]
a Please read “Caution on Performing Secondary Operations” (Page 512)
5 x 2.3 M4 9 0.38 • KSUW2.5-R2J15 when performing modifications and/or secondary operations for safety
5 x 2.3 M4 9 0.37 • KSUW2.5-R2J16 concerns.
5 x 2.3
—
M4
—
9
—
0.36
0.63
• KSUW2.5-R2J17
KSUW3-R1

Gears
•

Miter
5 x 2.3 M4 10 0.62 KSUW3-R1J17
6 x 2.8 M5 10 0.59 • KSUW3-R1J18
6 x 2.8 M5 10 0.58 • KSUW3-R1J19
6 x 2.8
—
M5
—
10
—
0.56
0.63
• KSUW3-R1J20
KSUW3-R2
•

Gears
Bevel
5 x 2.3 M4 10 0.62 KSUW3-R2J17
6 x 2.8 M5 10 0.59 • KSUW3-R2J18
6 x 2.8 M5 10 0.58 • KSUW3-R2J19
6 x 2.8 M5 10 0.56 • KSUW3-R2J20

KPG

Screw
Gears
G Plastic Worm Wheels
E F

Products Gearboxes Gear Pair

Worm
J

D’
D
A
B
C

Bevel

H1

Hub width Total length Mounting distance Allowable torque (N·m) Allowable torque kgf·m) Backlash Weight
Catalog No.
Other

F G J Bending strength Bending strength (mm) (kg)

13 35 35.5 4.78 0.49 0~0.33 0.046 KPG2-20R1

13 35 35.5 4.82 0.49 0~0.33 0.046 KPG2-20R2
14 36 43.5 (8.46) 0.86 0~0.36 0.066 KPG2.5-20R1
14 36 43.5 (8.54) 0.87 0~0.36 0.066 KPG2.5-20R2
15 43 52 (13.7) 1.40 0~0.38 0.13 KPG3-20R1
15 43 52 (13.8) 1.41 0~0.38 0.13 KPG3-20R2
[Caution on Secondary Operations] a Please read “Caution on Performing Secondary Operations” (Page 512) when performing modifications
and/or secondary operations for safety concerns.
b Plastic gears are susceptible to the effects of temperature and moisture. Dimensional changes may occur while
performing secondary operations and during post-machining operations.

561
 We welcome your requests for

Custom Gears

Best ever quality

in a Stock Rack series!

562 For details, see page VI.