Rotary Clamp Cylinder

MK2T Series
Double Guide Type

Rotation mechanism uses 2 guide rollers.

(Clamp part)
0.5°
Non-rotating accuracy: ±0.9°⇒±
∗ Values for ø32, ø40. Comparison with our MK2 series

Rotation angle: 90°±10°⇒ 90°±5°

MK

3 times the allowable moment of inertia

ø32, ø40 ∗ Comparison with our MK2 series
MK2T
CK1
10−1
CLK2
Allowable moment of inertia [kg·m2]

MK2T (Double guide type)

CLKG
10−2
CKQ
CLKQ
CK
CLK
10−3
MK
CKQ

Rotation mechanism Standard arm

10−4
50 100 200
Piston speed [mm/s]

Horizontal mounting possible

Piston rod
 Interchangeable
mounting pitch
Rod cover (MK)
Guide roller
 Small auto switches
mountable on 4
surfaces ∗ Bore size ø20, ø25

D-
-X
403
 MK2T Series
Model Selection
Series MK2T
Item
ø12, ø16 —
Max. piston speed Note) [mm/s] ø20, ø25 200
ø32 to ø63 200
ø12 —
ø16 —
Non-rotationg accuracy
(Clamp part) ø20, ø25 ±1.0°
ø32, ø40 ±0.5°
ø50, ø63 ±0.5°
Rotation angle 90°±5°
Horizontal mounting Allowed
Note) “Maximum piston speed” indicates the maximum speed possible when employing a standard arm.

During unclamping During unclamping

(Extension end) (Extension end)
Counterclockwise Clockwise

Rotation angle Rotation angle

During clamping (Retraction end)

Non-rotating accuracy
[Actual calculation example] Bore size ø32, ø40
1.0 x 10−1
S
B
A
L

MK2T

Arm: Ι1
Allowable moment of inertia [kg ·m2]

Arm weight: m1 øD
1.0 x 10−2

Clamp jig: Ι2
Clamp jig weight: m2 4.1 x 10−3

Ι (Moment of inertia)
Example) Find the moment of inertia of the arm.
A2 + B2 A 2
Ι1 = m1 · + m1 · –S
12 2 1.0 x 10−3
Find the moment of inertia of the clamp jig.
D2
Ι2 = m2 · + m2 · L2
8

(Calculation example) Cylinder bore size ø32

A = 0.1 m, B = 0.035 m, S = 0.012 m, L = 0.075 m, D = 0.024 m
m1 = 0.96 kg, m2 = 0.32 kg
0.12 + 0.0352 0.1 2
Ι1 = 0.96 x + 0.96 x – 0.012 = 2.3 x 10–3 kg·m2 1.0 x 10−4
12 2
2
10 100 120 200 1000
0.024
Ι2 = 0.32 x + 0.32 x 0.0752 = 1.8 x 10–3 kg·m2 Maximum piston speed [mm/s]
8
Calculation Example (ø32, clamp stroke 10 mm)
Find the actual moment of inertia.
Max. piston speed Average piston speed Note 1) Stroke total Stroke time Note 2)
Ι = Ι1 + Ι2 = (2.3 + 1.8) x 10–3 = 4.1 x 10–3 kg·m2
120 mm/s 75 mm/s 39 mm 0.52 sec.
Note 1) Average piston speed = Maximum piston speed ÷ 1.6.
Note 2) Please use the stroke speeds indicated above.

404
 Model Selection MK2T Series

Moment of Inertia
ø20, ø25 ø32, ø40
10−1 10−1

MK2T

10−2
MK2T
Allowable moment of inertia [kg· m2]

Allowable moment of inertia [kg· m2]

10−2

10−3

10−3

10−4 MK

ø20, ø25 Standard arm single unit MK2T

CK1
ø32, ø40 Standard arm single unit

10−5 10−4 CLK2

50 100 200 50 100 200
Maximum piston speed [mm/s] Maximum piston speed [mm/s] CLKG
CKQ
ø50, ø63 CLKQ
10−1
CK
MK2T CLK

CKQ
Allowable moment of inertia [kg· m2]

10−2

10−3

ø50, ø63 Standard arm single unit

10−4
50 100 200
D-
Maximum piston speed [mm/s]

Note) Maximum piston speed is equivalent to approximately 1.6x the average piston speed. (Rough indication) -X
405
 Rotary Clamp Cylinder: Double Guide Type

MK2T Series
ø20, ø25, ø32, ø40, ø50, ø63
How to Order

MK2T B 20 10 R N M9BW
Rotary clamp cylinder
Double guide type Number of auto switches
Nil 2 pcs.
Mounting bracket
S 1 pc.
B Through-hole/Both ends tapped common (Standard)
G Head end flange
∗ Mounting bracket is included, (but not assembled).
Auto switch type
Nil Without auto switch (Built-in magnet)
Bore size ∗ For applicable auto switch models, refer to the below
20 20 mm 40 40 mm table.
25 25 mm 50 50 mm
32 32 mm 63 63 mm
Body option Made to Order
Cylinder port Nil Standard (Female thread) (Refer to page 407.)
M thread ø20, ø25 N With arm
Nil
Rc ∗ Arms are included when shipped, (but
TN NPT ø32 to ø63 not assembled).
TF G

Clamp stroke Rotary direction

(Unclamp → Clamp)
Symbol Clamp stroke Applicable bore size
10 10 mm ø20 to ø40 R Clockwise
20 20 mm ø20 to ø63 L Counterclockwise
50 50 mm ø50 to ø63

Applicable Auto Switches/Refer to pages 941 to 1067 for further information on auto switches.
Load voltage Auto switch model Lead wire length (m)
Indicator light

Electrical Wiring Pre-wired Applicable

Type Special function Perpendicular In-line 0.5 1 3 5 None
entry (Output) DC AC connector load
ø20, ø25 ø32 to ø63 ø20 ø25 ø32 to ø63 (Nil) (M) (L) (Z) (N)
3-wire (NPN) 5 V, M9NV M9N  —   —  IC circuit
Grommet
3-wire (PNP) 12 V M9PV M9P  —   — 
M9BV M9B  —   —  —
Solid state auto switch

2-wire 12 V
Connector — J79C —  —    —
3-wire (NPN) 5 V, M9NWV M9NW     —  IC circuit
Diagnostic indication
(2-color indicator)
3-wire (PNP) 12 V M9PWV M9PW     — 
Relay,
Yes 2-wire 24 V 12 V — M9BWV M9BW     —  —
PLC
3-wire (NPN) 5 V, M9NAV∗1 M9NA∗1     —  IC circuit
Water resistant
(2-color indicator)
Grommet 3-wire (PNP) 12 V M9PAV∗1 M9PA∗1     — 
2-wire 12 V M9BAV∗1 M9BA∗1     —  —
Diagnostic output
(2-color indicator) 4-wire 5 V, 12 V — — F79F  —   —  IC circuit
Magnetic field resistant 2-wire — — P3DWA∗∗∗  —   — 
— —
(2-color indicator) (No polarity) — — P4DW∗∗ — —   — 
3-wire
(NPN equivalent) —
5V — A96V A96  —  — — — IC circuit —
Reed auto switch

Grommet Yes
— 200 V — A72 — A72H  —  — — —
—
12 V 100 V A93V∗2 A93     — —
No
2-wire
5 V, 12 V 100 V or less A90V A90  —  — — — IC circuit Relay,

Connector
Yes 24 V 12 V — — A73C —  —    — — PLC
No 5 V, 12 V 24 V or less — A80C —  —    — IC circuit
Diagnostic indication
(2-color indicator) Grommet Yes — — — A79W —  —  — — — —
∗1 Water resistant type auto switches can be mounted on the above models, but in such case SMC cannot guarantee water resistance.
Consult with SMC regarding water resistant types with the above model numbers.
∗2 1 m type lead wire is only applicable to D-A93.
∗ Lead wire length symbols: 0.5 m ·········· Nil (Example) M9NW ∗ Solid state auto switches marked with “” are produced upon receipt of order.
1m ·········· M (Example) M9NWM ∗∗ For D-P4DW, ø40 to ø63 are available.
3m ·········· L (Example) M9NWL ∗∗ Only D-P4DW type is assembled at the time of shipment.
5m ·········· Z (Example) M9NWZ ∗∗∗ The D-P3DWA is mountable on bore size ø25 to ø63.
None ·········· N (Example) J79CN
∗ Since there are other applicable auto switches than listed, refer to page 413 for details.
∗ For details about auto switches with pre-wired connector, refer to pages 1014 and 1015.
∗ When D-M9(V)/M9W(V)/M9A(V)/A9(V) types with ø32 to ø50 are mounted on a side other than the port side, order auto switch mounting brackets separately. Refer to
page 414 for details.
∗ Auto switches are shipped together (not assembled).
A 406
 Rotary Clamp Cylinder: Double Guide Type MK2T Series

Specifications

Bore size (mm) 20 25 32 40 50 63

Action Double acting
Rotation angle Note 1) 90° ±5°
Rotary direction Note 2) Clockwise, Counterclockwise
Rotary stroke (mm) 19 29 33
Clamp stroke (mm) 10, 20 20, 50
Theoretical clamp force (N) Note 3) 100 185 300 525 825 1300
Fluid Air
Proof pressure 1.5 MPa
Operating pressure range 0.1 to 1 MPa
Without auto switch: –10 to 70°C (No freezing)
Ambient and fluid temperature
With auto switch: –10 to 60°C (No freezing)
Lubrication Non-lube
Piping port size M5 x 0.8 Rc1/8, NPT1/8, G1/8 Rc1/4, NPT1/4, G1/4
Mounting Through-hole/Both ends tapped common, Head end flange
Cushion Rubber bumper
Rotary Angle Stroke length tolerance +1.0
0
Piston speed 50 to 200 mm/s
During unclamping During unclamping Non-rotating accuracy (Clamp part) ±1.0° ±0.5°
(Extension end) (Extension end)
Note 1) Refer to “Rotary Angle” figure.
85° to 95°
(90°±5°)
85° to 95°
(90°±5°) Note 2) Direction of rotation viewed from the rod end when the piston rod is retracting. MK
L type R type Note 3) At 0.5 MPa.

MK2T
Theoretical Output
Clamp part Unit: N CK1
Non-rotating accuracy Operating pressure (MPa)
±0.5° to 1.0°
Bore size Rod size Operating Piston area
During clamping (Retraction end) (mm) (mm) direction (cm2) 0.3 0.5 0.7 1.0 CLK2
R 2 60.8 100 139 200
20 12
H 3 90.2 149 208 298 CLKG
Made to Order: Individual Specifications R 3.7 112 185 258 370
(For details, refer to page 415.) 25 12 CKQ
H 4.9 149 245 341 490 CLKQ
Symbol Description
R 6 182 300 418 600
-X1859 With head end pin hole 32 16 CK
H 8 243 400 557 800 CLK
Made to Order R 10.5 319 525 731 1050
40 16
(Refer to pages 1069 to 1262 for details.) H 12.5 380 625 870 1250 CKQ
Symbol Specifications R 16.5 502 825 1149 1648
Spatter resistant coil scraper, Lube-retainer,
50 20
-XC89 Grease for welding (Piston rod: S45C) H 19.6 596 980 1365 1961
R 26 780 1300 1820 2600
Spatter resistant coil scraper, Grease for
63 25
-XC91 welding (Piston rod: S45C) H 31.2 948 1560 2172 3121
Note) Theoretical output (N) = Pressure (MPa) x Piston area (cm2) x 100 Operating direction
R: Rod end (Clamp)
H: Head end (Unclamp)
Option/Arm Weight/Through-hole Mounting
Unit: g
Bore size (mm) Part no. Accessories Clamp stroke Bore size (mm)
20 (mm) 20 25 32 40 50 63
MK-A020Z Clamp bolt,
25 10 367 448 806 1008 — —
Hexagon socket
32 head cap screw,
MK-A032Z 20 433 520 914 1127 2049 2609
40 Hexagon nut,
50 MK-A050Z 50 — — — — 2672 3354
Spring washer
63 MK2T-A063
Additional Weight
Mounting Bracket/Flange Unit: g
Bore size (mm) 20 25 32 40 50 63
Bore size (mm) Part no. Accessories With arm 100 100 200 200 350 600
20 CQS-F020 Head end flange (including mounting bolt) 133 153 166 198 345 531
25 CQS-F025 Calculation: (Example) MK2TG20-10RN
32 MK2T-F032 Hexagon socket • Standard calculation: MK2TB20-10R 367 g
40 MK2T-F040 head cap screw • Extra weight calculation: Head end flange 133 g
With arm 100 g
50 MK2T-F050
63 MK2T-F063
600 g
D-
-X
407
MK2T Series

Construction
MK2T20 to 63

With arm (N) Head end flange (G)

!4
!5
!3
!7
!8
!6
!6

i @0 @5 !2 !0 @2 !9 r q w u y t o !1 @1 @3 e o !9 @5 @4

@6 In case of clamp stroke 50 mm

Component Parts Component Parts

No. Description Material Note No. Description Material Note
1 Rod cover Structural steel 13 Arm Structural steel
2 Cylinder tube Aluminum alloy 14 Clamp bolt Structural steel
3 Piston Aluminum alloy 15 Hexagon nut Structural steel
Oil-impregnated sintered alloy ø20, 25 16 Hexagon socket head cap screw Structural steel
4 Bushing
Bronze casted ø32 to 63 17 Spring washer Steel wire
Stainless steel ø20, 25 18 Flange Structural steel
5 Guide shaft
Structural steel ø32 to 63 19 Gasket NBR
6 Guide roller Structural steel 20 Coil scraper Bronze
ø20, 25 21 Piston seal NBR
7 Retaining ring Steel for special applications
ø32 to 63 22 Rod seal NBR
Stainless steel ø20, 25 23 Wear ring Resin
8 Piston rod
Structural steel ø32 to 63 24 Bottom plate Aluminum alloy
9 Bumper Urethane 25 Retaining ring Steel for special applications
10 Seal retainer Aluminum alloy Hexagon socket head
cap screw (with SW) Structural steel
11 Magnet — 26
12 Key Structural steel Washer Stainless steel ø25, ø32 only
Hexagon socket head cap screw Structural steel

Replacement Parts: Seal Kit

Bore size (mm) 20 25 32 40 50 63
Kit no. MK2T20-PS MK2T25-PS MK2T32-PS MK2T40-PS MK2T50-PS MK2T63-PS
Content Set of nos. above !99 @0 @1 @2
∗ Seal kit includes !9, @0, @1, @2. Order the seal kit, based on each bore size.

408
 Rotary Clamp Cylinder: Double Guide Type MK2T Series

Precautions Precautions for Designing and Mounting Arms

When arms are to be made separately, their length and weight should be within the following
Be sure to read this before handling the range. When mounting the cylinder horizontally, also select within the same operating range as
the following items.
products. Refer to back page 50 for Safety
Instructions and pages 3 to 12 for Actua-
tor and Auto Switch Precautions.
1. Allowable bending moment
Use the arm length and operating pressure within Graph (1) for allowable bending
moment loaded piston rod.
Caution
Graph (1) L
Clamp Arm Mounting MK2T50/63
20
1. Use a clamp arm that is available as an option.
MK2T32/40
To fabricate a clamp arm, make sure that the
allowable bending moment and the inertial
moment will be within the specified range. MK2T20/25 When arm length is 8 cm, pressure should be
10
If a clamp arm that exceeds the specified less than
value is installed, the internal mechanism in 8 MK2T20/25: 0.45 MPa
Arm length L (cm)
the cylinder could become damaged. MK2T32/40: 0.55 MPa
6 MK2T50/63: 0.8 MPa.
Ensuring Safety
4
Operating
1. If one side of the piston is pressurized by range
supplying air with the clamp arm attached, the
piston will move vertically while the clamp arm
rotates. This operation could be hazardous to 2
personnel, as their hands or feet could get
caught by the clamp arm, or could lead to
equipment damage. Therefore, it is important MK
to secure as a danger zone a cylindrical area
with the length of the clamp arm as its radius, MK2T
and the stroke plus 20 mm as its height. 0.45 0.55 0.8
0.1 0.2 0.4 0.6 1
CK1
Installation and Adjustment/ Operating pressure (MPa)

Clamp Arm Removal and Reinstallation CLK2

2. Moment of inertia
1. During the removal or reinstallation of the When the arm is long and heavy, damage of internal parts may be caused due to
clamp arm, make sure to use a wrench or a inertia. Use the inertia moment and cylinder speed within Graph (2) based on arm CLKG
vise to secure the clamp arm before remov- requirements.
ing or tightening the bolt. CKQ
This is to prevent the bolt tightening torque from Graph (2) CLKQ
being applied to the piston rod, which could
damage the cylinder’s internal mechanism. CK
10–1
MK2T50/63 CLK
When arm’s moment of inertia is 1 x10–2
Mounting Bolt for MK2TB kg·m2, cylinder speed should be less than CKQ
MK2T32/40 MK2T32/40: 85 mm/s
Mounting: Mounting bolt for through-hole type is
MK2T50/63: 140 mm/s.
available.
Moment of inertia (kg·m2)

For calculating moment of inertia, refer to

Refer to the following for ordering procedures.
10–2 pages 404, 405 and 418.
Order the actual number of bolts that will be MK2T20/25
used. Note) Maximum piston speed is equivalent to
approximately 1.6x the average piston
Example) CQ-M5 x 115 L 4 pcs. speed. (Rough indication)
Mounting bolt

10–3

Operating
range
Flat
washer
Note) Be sure to use a flat washer to mount
cylinders via through-holes.
10–4
50 85 100 140 200
Note) Maximum piston speed (mm/s)
Cylinder model C D Mounting bolt part no.
MK2TB20-10 11 115 CQ-M5 x 115 L • To attach and detach the arm to and from the
MK2TB20-20 11 135 CQ-M5 x 135 L piston rod, fix the arm with a wrench or vise Hexagon
MK2TB25-10 8.5 115 CQ-M5 x 115 L and then tighten the bolt. wrench
(If an excessive force is applied in the rotary key
MK2TB25-20 8.5 135 CQ-M5 x 135 L
direction, it may bring about the damage to the Wrench
MK2TB32-10 11.5 145 CQ-M5 x 145 L internal mechanism.)
MK2TB32-20 11.5 165 CQ-M5 x 165 L Refer to the following table for the tightening Arm
MK2TB40-10 7.5 145 CQ-M5 x 145 L torque for mounting.
MK2TB40-20 7.5 165 CQ-M5 x 165 L (N·m)
MK2TB50-20 13.5 185 CQ-M6 x 185 L Bore size (mm) Proper tightening torque
MK2TB50-50 10 245 CQ-M6 x 245 L 20, 25
32, 40
11.5 to 14.0
24 to 30
D-
MK2TB63-20 13 185 CQ-M8 x 185 L
MK2TB63-50 14 250 CQ-M8 x 250 L 50 75 to 90
63 106 to 127 -X
409
MK2T Series

Dimensions: ø20, ø25

2 x ø6.6
17.5
14

C
A

51
35
7
8 B
11 to 22
16 M6 x 1.0

Head End Flange (mm)

Model A B C
MK2TG20 60 39 48
MK2TG25 64 42 52

M8 x 1.25 2 x M5 x 0.8
Thread length 11 4 x ø5.4 through S 5.5
2 x 4 x ø9 counterbore depth 7
øB
ø12
C
A
10 –0.07
–0.15

10 –0.07
–0.15
17 2 x 4 x M6 x 1.0 17
4.5
C R
A Q

Through-hole/Both Ends Tapped Common (Standard) (mm)

Clamp stroke 10 mm Clamp stroke 20 mm
Bore size A øB C
Q R S Q R S
20 36 47 25.5 116.5 110.5 59 136.5 130.5 69
25 40 52 28 119 113 59 139 133 69

410
 Rotary Clamp Cylinder: Double Guide Type MK2T Series

Dimensions: ø32, ø40, ø50, ø63

E
4 x øF A

B
E

B
D 10
A D
C F
C G

Head End Flange (mm) With Arm (mm)

Model A B C D E øF Model A B C D E F G
MK2TG32 8 65 48 34 56 5.5 MK2T32-N 18 67 20 45 21.5 15 to 25 M8 x 1.25
MK
MK2TG40 8 72 54 40 62 5.5 MK2T40-N 18 67 20 45 21 15 to 25 M8 x 1.25
MK2TG50 9 89 67 50 76 6.6 MK2T50-N 22 88 22 65 29.5 20 to 40 M10 x 1.5
MK2T
MK2TG63 9 108 80 60 92 9 MK2T63-N 32 91 32 65 34.5 20 to 40 M10 x 1.5
CK1
CLK2
CLKG
CKQ
S N CLKQ
I thread length J N 2 x 4 x M thread 2xV T CK
CLK

CKQ
øU
O
A
C
D

øB

D K
4 x øG through C R
2 x 4 x øH counterbore depth A P Q

Through-hole/Both Ends Tapped Common (Standard) (mm)

V
Bore size A øB C D G H I J K M N O P øU
Nil TN TF
32 45 60 34
–0.07
14 –0.15 5.5 9 depth 7 M10 x 1.5 12 6 M6 x 1.0 17 14 4.5 16 Rc 1/8 NPT 1/8 G 1/8
40 52 69 40
–0.07
14 –0.15 5.5 9 depth 7 M10 x 1.5 12 6 M6 x 1.0 17 14 5 16 Rc 1/8 NPT 1/8 G 1/8
50 64 86 50
–0.07
17 –0.15 6.6 11 depth 8 M12 x 1.75 15 7 M8 x 1.25 22 19 7 20 Rc 1/4 NPT 1/4 G 1/4
63 77 103 60
–0.07
22 –0.15 9 14 depth 10.5 M16 x 2 21 8 M10 x 1.5 28.5 19 7 25 Rc 1/4 NPT 1/4 G 1/4

Clamp stroke 10 mm Clamp stroke 20 mm Clamp stroke 50 mm

Bore size
Q R S T Q R S T Q R S T
32 148 140 74 7.5 168 160 84 7.5 — — — —
40 151.5 144 75 8 171.5 164 85 8 — — — —
50 — — — — 191 179 91.5 12.5 254.5 242.5 121.5 14 D-
63 — — — — 192 182 93 10.5 256 246 123 15
-X
411
 MK2T Series
Auto Switch Mounting
Auto Switch Proper Mounting Position (Detection at Stroke End)
ø20 to ø63 ø32 to ø63
D-M9 D-F7/J79 Auto switch (Rail mounting) B
Auto switch (Direct mounting) B D-F7V
D-M9V
D-M9W D-J79C
D-M9WV D-F7W/J79W
D-F7WV
D-M9A D-F7BA/F7BAV
D-M9AV D-F79F/F7NT
D-A9 D-A7/A80
D-A9V D-A73C/A80C
A
D-A7H/A80H
A
D-A79W
D-P4DW

ø25 to ø63
D-P3DWA
Auto switch D-P3DWA
Bore size model A B U
≈U Auto switch (Direct mounting) B
25 56.5 6.5 33
32 71.5 9 35.5
40 72.5 11.5 39
50-20st 88 17 45
50-50st 118 20.5 45
63-20st 90 18 48.5
63-50st 120 22 48.5
A Note) For bore sizes ø32 to ø50, the D-P3DWA
is mountable only on the port side.

Mounting Rail mounting Direct mounting

D-A7H/A80H D-M9
D-A73C/A80C D-M9V
D-A7 D-F7/F79F/J79 D-M9W D-A9
D-F7V/J79C D-A79W D-P4DW D-M9WV D-F7NT
Model D-A8 D-A9V
D-F7BA/F7W D-M9A
D-J79W/F7WV D-M9AV
A B A B A B A B A B A B A B
MK2T20 — — — — — — — — 60.5 9 56.5 5 63 11.5
MK2T25 — — — — — — — — 61 11 57 7 63.5 13.5
MK2T32 73 (73.5) 10.5 (11) 73.5 11 70.5 8 — — 76 13.5 72 9.5 78.5 16
MK2T40 74 (74.5) 13 (13.5) 74.5 13.5 71.5 10.5 70 9 77 16 73 12 79.5 18.5
MK2T50-20st 89.5 (90) 18.5 (19) 90 19 87 16 85.5 14.5 92.5 21.5 88.5 17.5 95 24
MK2T50-50st 119.5 (120) 22 (22.5) 120 22.5 117 19.5 115.5 18 122.5 25 118.5 21 125 27.5
MK2T63-20st 91.5 (92) 19.5 (20) 92 20 89 17 87.5 15.5 94.5 22.5 90.5 18.5 97 25
MK2T63-50st 121.5 (122) 23.5 (24) 122 24 119 21 117.5 19.5 124.5 26.5 120.5 22.5 127 29
∗ ( ): D-A72
Note) When setting an auto switch, confirm the operation and adjust its mounting position.

A 412
 Auto Switch Mounting MK2T Series

Operating Range
Operating Range (Dimensions) (mm)
Bore size
Auto switch model
20 25 32 40 50 63
D-M9/M9V 3 3.5 4.5 4.5 5 5
D-M9W/M9WV 5.5 5.5 6.5 5.5 6.5 6.5
D-M9A/M9AV
D-A9/A9V 9 9.5 9 9.5 9.5 11
D-F7/J79
D-F7V/F79F/J79C — — 6 6 6 6.5
D-F7W/F7WV
D-F79F/F7BA/F7BAV/F7NT
∗ Since this is a guideline including hysteresis, not meant to be guaranteed.
D-A7/A80 (Assuming approximately ±30% dispersion.)
D-A7H/A80H — — 9.5 11.5 11 13.5
There may be the case it will vary substantially depending on an ambient
D-A73C/A80C environment.
D-A79W — — 6 7 7 9.5 ∗ Figures for models D-M9(V), M9W(V), M9A(V), and A9(V) with ø32
D-P3DWA — 5.5 6 6 6.5 6.5 or more indicate the operating range when using the current auto switch-
D-P4DW — — — 5 5 5 mounting groove, without using auto switch mounting bracket (BQ2-012).

Other than the models listed in “How to Order”, the following auto switches are applicable.
For detailed specifications, refer to pages 941 to 1067.
Auto switch type Model Electrical entry Features Applicable bore size
D-F7NV, F7PV, F7BV —
D-F7NWV, F7BWV Grommet (Perpendicular) Diagnostic indication (2-color indicator)
MK
D-F7BAV Water resistant
D-F79, F7P, J79 — ø32 to ø63 MK2T
Solid state
D-F79W, F7PW, J79W Diagnostic indication (2-color indicator)
D-F7BA Grommet (In-line) Water resistant (2-color indicator) CK1
D-F7NT With timer
D-P5DW
D-A73
Magnetic field resistant
—
ø40 to ø63
CLK2
Grommet (Perpendicular)
D-A80 Without indicator light
Reed
D-A73H, A76H —
ø32 to ø63 CLKG
Grommet (In-line)
D-A80H Without indicator light
CKQ
∗ With pre-wired connector is available for solid state auto switches, too. For details, refer to pages 1014 and 1015. CLKQ
∗ Normally closed (NC = b contact), solid state auto switch (D-F9G/F9H type) are also available. For details, refer to page 959.
CK
CLK

CKQ

D-
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413 A
MK2T Series

Auto Switch Mounting Bracket/Part No.

Auto switch Bore size (mm)

mounting ø20 ø25 ø32, ø40, ø50 ø63
surface
Port side Port side Port side

C A C A C A

B B
B
Auto switch mounting surface Auto switch mounting surface Auto switch mounting surface
Auto switch
model Port, A, B, C sides Port side A, B, C sides Port, A, B, C sides
qBQ-2
wBQ2-012
Two types of auto switch mounting
bracket are used as a set.
D-M9 Set screw
D-M9V (not used)
D-M9W w
D-M9WV No auto switch mounting
D-M9A bracket necessary. No auto switch mounting No auto switch mounting
D-M9AV bracket necessary. bracket necessary.
D-A9 q
D-A9V

No auto switch mounting

D-P3DWA — —
bracket necessary.
Note 1) For ø32 to ø50 of each cylinder series, when mounting compact auto switches on one of the three sides other than the port side (above A, B, C side) in the figure above, a
separate auto switch mounting bracket is necessary as shown in the table above, so please order one separately from the cylinder.
(The same is true when mounting compact auto switches with the auto switch mounting rail, not using the compact auto switch mounting groove, for diameters ø63.)
Example
MK2TB32-10R-M9BW ····· 1 unit
BQ-2 ····· 2 pcs.
BQ2-012 ····· 2 pcs.
Note 2) When the cylinder is shipped, an auto switch mounting bracket and auto switch are included in the shipment.

Bore size (mm)

Auto switch model
32 40 50 63
D-F7/J79
D-F7V
D-J79C
D-F7W/J79W
D-F7WV
D-F7BA/F7BAV BQ-2
D-F79F/F7NT
D-A7/A80
D-A73C/A80C
D-A7H/A80H
D-A79W
D-P4DW — BQP1-050
Note 3) When the cylinder is shipped, an auto switch mounting bracket and auto switch are included in
the shipment. However, ø40 to ø63 with the D-P4DW are assembled at the time of shipment.

[Mounting screw set made of stainless steel]

The set of stainless steel mounting screws (with nuts) described below is available and can be used depending on
the operating environment. (Please order the auto switch spacer BQ-2, since it is not included.)
The “D-F7BA/F7BAV” switch is set on the cylinder with the stainless steel screws above when shipped.
When only a switch is shipped independently, “BBA2” screw set is attached.
Note 4) When mounting D-M9A(V) anywhere other than the port side of ø32, ø40, ø50, please order auto switch mounting
brackets BQ2-012S, BQ-2, and the stainless steel screw set BBA2 separately.
Auto Switch Mounting
Detailed Contents of Stainless Steel Mounting Screw Set Bracket Weight
Part Content Applicable auto Applicable Mounting bracket part no. Weight (g)
switch mounting
no. Description Size No. bracket part no. auto switch BQ-1 1.5
M3 x 0.5 x 8 L 1 BQ-1 BQ-2 1.5
Auto switch mounting screw D-A7
M3 x 0.5 x 10 L 1 BQ-2 D-A8 BQ2-012 5
BBA2 D-F7 BQP1-050 16
Auto switch mounting nut (Square nut) M3 x 0.5 1 BQ-1
Auto switch mounting nut (Convex type) D-J7
M3 x 0.5 1 BQ-2
Note 5) When using BQ-1, BBA2 may be used by itself.
When using BQ-2, BQ-2 and BBA2 should be used together as a set, and used in combination with the auto switch
spacer (black resin material) and stainless steel screws.
414
 MK2T Series
Made to Order: Individual Specifications
Please contact SMC for detailed dimensions, specifications and lead times.

Symbol
1 With Head End Pin Hole -X1859
How to Order
MK2T Standard model no. X1859

With head end pin hole

Specifications
Applicable series MK2T
Bore size ø32, ø40, ø50, ø63

Specifications other than above Same as standard product

Dimensions

Head end pin hole

ø3.3 +0.15
+0.05 depth 3

MK
MK2T
L

CK1

K CLK2
CLKG
Bore size CKQ
(mm)
K L
CLKQ
32 20 ±0.15 7 ±0.15
CK
40 24 ±0.15 7 ±0.15 CLK
50 30 ±0.15 8 ±0.15
63 35 ±0.15 9 ±0.15 CKQ
∗ Dimensions other than above are same
as basic type.

D-
-X
415
 MK2T Series
Specific Product Precautions 1
Be sure to read this before handling the products.
Refer to back page 50 for Safety Instructions and pages 3 to 12 for Actuator and Auto
Switch Precautions.

Operating Environment Speed Adjustment

Warning Warning
1. Do not use the cylinder under following envi- 1. Make sure to connect a speed controller to
ronments: the cylinder and adjust it so that the cylinder
1) An area in which fluids such as cutting oil splash on the speed will be within a range of 50 to 200
piston rod. mm/s.
2) An area in which foreign matter such as particles, cutting If a clamp arm other than the available option is used, make
chips, dust, or spatter is present. sure to select an appropriate arm after calculating the inertial
3) An area in which the ambient temperature exceeds the oper- moment of the arm.
ating range. To operate a speed controller, make sure that the valve is fully
4) An area exposed to direct sunlight. closed, and gradually open the valve to adjust the speed.
5) An environment that poses the risk of corrosion.

Clamp Arm Removal and Reinstallation

Warning
1. To remove and reinstall the arm on the piston
rod, instead of securing the cylinder body,
use a wrench to secure the arm to loosen or
to tighten the bolt (Fig. (1)).
An excessive amount of rotational force will be applied to the
piston rod if the bolt is tightened by securing the cylinder body,
which could damage the internal parts.
To fabricate an arm, make sure to machine a detect portion that
corresponds to the parallel section at the rod end.

Wrench
Hexagon wrench

Arm

Fig. (1)

416
 MK2T Series
Specific Product Precautions 2
Be sure to read this before handling the products.
Refer to back page 50 for Safety Instructions and pages 3 to 12 for Actuator and Auto
Switch Precautions.

Operating Environment

Warning
1. A cylinder could malfunction or the non-rotating accuracy could be affected if a rotational force is
applied to the piston rod. Therefore, observe the particulars given below before operating the
cylinder.
1) Do not absolutely perform any work (such as clamping or acting as a stopper, etc.) in the rotary direction (Fig. (2)).
2) To clamp, make sure to do so within the clamp stroke (straight-line stroke) range (Fig. (3)).
3) Make sure that the clamping surface of the workpiece is perpendicular to the cylinder's axial line (Fig. (4)).
4) Do not operate the cylinder in such a way that an external force causes the workpiece to move while being clamped (Fig. (5)).
5) Furthermore, do not operate the cylinder in an application in which a rotational force will be applied to the piston rod.

1) Do not perform any work in the rotary direction.

MK
MK2T
CK1
CLK2
Fig. (2) CLKG
CKQ
CLKQ
2) Do not clamp during the rotary stroke.
CK
CLK

Rotary stroke CKQ

Rotary stroke

Clamp stroke

Fig. (3)

3) Do not clamp on a slanted surface. 4) Make sure that the workpiece does not move during clamping.

D-
Fig. (4) Fig. (5)
-X
417
 MK2T Series
Specific Product Precautions 3
Be sure to read this before handling the products.
Refer to back page 50 for Safety Instructions and pages 3 to 12 for Actuator and Auto
Switch Precautions.

Mounting With Magnetic Field Resistant Auto Switch

• When a magnetic substrate surrounds the cylinder as shown in the D-P3DWA, P4DWL
figure below (including when the magnetic substrate is only on one
• If welding cables or welding gun electrodes are in the vicinity of the
side of the cylinder), the movement of the auto switch may become
cylinder, the magnets in the cylinder could be affected by the
unstable, so please contact SMC.
external magnetic fields. (Contact SMC if the welding amperage
exceeds 16000 A.) If the source of strong magnetism comes in
contact with the cylinder or an auto switch, make sure to install the
cylinder away from the source of the magnetism.
If the cylinder is to be used in an environment in which spatter will
come in direct contact with the lead wires, cover the lead wires with
a protective tube. For the protective tube, use a tube I.D. ø7 or
Magnetic substance more, which excels in heat resistance and flexibility.
(Steel plate, etc.) Contact SMC if an inverter welder or a DC welder will be used.

Magnetic substance
(Steel plate, etc.)

Calculation of Moment of Inertia Ι: Moment of inertia (kg·m2) m: Load mass (kg)

1. Thin shaft 4. Thin rectangular plate (Rectangular parallelopiped)

Position of rotational axis: Position of rotational axis:
Vertical to the bar and through the end Vertical to the plate and through the end

a12 a22 4a12 + b2 4a22 + b2

Ι = m1 · + m2 · Ι = m1 · + m2 ·
3 3 12 12

2. Thin shaft 5. Thin rectangular plate (Rectangular parallelopiped)

Position of rotational axis: Position of rotational axis:
Perpendicular to the shaft through the center of gravity Through the center of gravity and vertical to the plate
(Same as also thick rectangular plate)
a2 a2 + b2
Ι = m· a Ι = m·
12 12

3. Thin rectangular plate (Rectangular parallelopiped) 6. Load at the end of lever arm
Position of rotational axis:
Parallel to side b through the center of gravity

a2 a12
Ι = m· Ι = m1 · + m2 · a22 + K
12 3

2r2
k = m2 ·
5

418