SUPER PRECISION BEARINGS FOR

MACHINE TOOL APPLICATIONS

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NSK commenced operations as the first Japanese manu- development of new technologies, but also on the conti-
facturer of rolling bearings back in 1916. Ever since, we nuous optimisation of quality – at every process stage.
have been continuously expanding and improving not only Among other things, our research activities include
our product portfolio but also our range of services for product design, simulation applications using a variety
various industrial sectors. In this context our worlwide of analytical systems and the development of different
research and production facilities are linked together in steels and lubricants for rolling bearings.
a global network. Here we concentrate not only on the

Trademarks: All NSK product and service names listed in this catalogue are trademarks or registered trademarks of NSK Ltd.

2 SUPER PRECISION BEARINGS FOR MACHINE TOOL APPLICATIONS

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 SUPER PRECISION BEARINGS –
PRODUCT RANGE

Several types of Super Precision Bearings are available from NSK. These include
the ROBUST series of high performance bearings, special series of bearings for
unique and specialised applications, and the standard series bearings.

Angular Contact Ball Bearings - High-Precision

Basic Super Precision Bearings - manufactured to conform to ISO standards
-7
 0xx, 72xx, 79xx series
-C
 ontact angles: 15˚ (C), 25˚ (A5), 30˚ (A)
-C
 age design: phenolic (TR) or polyamide (TYN), depending on application requirements
-B
 all material: steel, ceramic (SN24)

Standard Series

Angular Contact Ball Bearings - High-Precision, Sealed

Pre-greased and sealed to reduce handling problems. Suitable for the maintenance of
machine tool spindles
-B
 asic Super Precision Angular Contact Ball Bearings
-A
 ngular Contact Ball Bearings - ROBUST Series, high-speed
-B
 ore size range: ø30–100 mm in ISO series 10 and 19 (70xx and 79xx)

Special Series

Angular Contact Ball Bearings - Ultra High-Speed

High performance bearings developed for high-speed operations with low temperature rise
Suitable for ultra high precision machining applications, and ultra high-speed applications
-C  ontact angles: 18˚ (BNR), 25˚ (BER)
-B  all material: steel (E & S type), ceramic (H and X type)
- C age design: phenolic (T), polyamide (TYN), PPS (TSR), depending on application
requirements
BNR & BER – ROBUST Series - R
 OBUST series also can be used for ultra high speed applications of over 3 million dmn.

Angular Contact Ball Bearings - Ultra High-Speed

Direct oil-air lubrication in order to achieve highest speeds
-D
 irect air-oil Lubrication via a through-hole in the outer ring
-C
 ontact angles: 18˚ (BNR), 25˚ (BER)
-L
 ubrication groove with O-rings in the outer ring
-H
 ybrid bearings - steel rings, ceramic balls

ROBUSTSHOT Series

4 SUPER PRECISION BEARINGS FOR MACHINE TOOL APPLICATIONS

 Angular Contact Ball Bearings - Ultra High-Precision
High performance bearings developed specifically for internal grinding or high-
speed motor applications under spring preload
-B
 ore size range: ø6–25 mm, contact angle: 15˚
-B
 all material: steel (S type), ceramic (H and X type)
-N
 on separable type
-U
 niversal combinations (DU and SU)
BSR Series

Cylindrical Roller Bearings - Ultra High-Speed, Single Row

Designed for ultra high-speed applications such as machining centre spindles
-C
 age material: brass (MR)(1), PEEK resin (TP)
-R
 oller material: steel, SHX
(1)
MR cage is used in the standard series

ROBUST Standard Series

Cylindrical Roller Bearings - High-Speed, Double Row

Designed to deliver high rigidity in high-speed applications such as lathe spindles
-C
 age material: brass (MB), PPS resin (TB)
-S
 tandard specification E44: Outer ring oil holes and groove

Standard & High Rigidity Series

Angular Contact Thrust Ball Bearings - High-Speed

High rigidity thrust bearings for lathe applications
-C
 ontact angles: 30˚ (BAR), 40˚ (BTR)
-B
 all material: steel (S & E type), ceramic (H type)

ROBUST Series: BAR & BTR

 SUPER PRECISION BEARINGS –
PRODUCT RANGE

Deep Groove Ball Bearing, High Precision

Suitable for high-speed and high precision motors
- Cage
 material: ball guided polyamide cage (T1X,TYA), inner ring guided phenolic cage (T),
selection depends on the application
- Suitable
 for silent or low vibration operation

Special Series

Ball Screw Support Bearings - BSBD Series, NSKHPS

The double row configuration, enables the bearings to support large axial forces in
both directions
-B
 SN series withouth flange, BSF series with flange
-P
 aired types also available
-C
 ontact lip seal - provides good sealing at high speeds

BSN & BSF Series

Angular Contact Thrust Bearings, High-Duty

The high load capacity design delivers five times the life expectancy compared to ball screw support
bearings for machine tool applications of a similar size. The number of rows can also be reduced
- E  asier handling than tapered roller bearings or thrust spherical roller bearings as a result
of non-separable configuration
- O ptimum ball bearing design results in lower rotational torque
Special Series - C
 an be universally matched to any required rigidity specification or life cycle
for Injection Molding Machines

Angular Contact Thrust Ball Bearings

High rigidity thrust bearings designed specifically for ball screw support applications in
machine tools
-C
 ontact angle: 60˚
-C
 an be universally matched to any required rigidity specification or life cycle
-A
 pre-greased line using special grease is also available
Special Series -C
 an be supplied with contact seals and waterproof grease
for Machine Tool Applications

6 SUPER PRECISION BEARINGS FOR MACHINE TOOL APPLICATIONS

SUPER PRECISION BEARINGS –
NOMENCLATURES

Angular Contact Ball Bearings - Standard Serie

7 0 10 A5 SN24 TR V1V SU EL P3 +Y3 MTS X

1 2 3 4 5 6 7 8 9 10 11 12 13

1 7 Angular Contact Ball Bearing - High Accuracy

2 Dimension 9 = 19 Series, 0 = 10 Series, 2 = 02 Series

3 Bore Code 00 = 10mm, 01 = 12mm
02 = 15mm, 03 = 17mm
4 and above: Bore diameter = Bore number x 5 (mm)

4 Contact Angle C = 15°, A5 = 25°, A = 30°

5 Material No symbol: steel ball
SN24: ceramic ball

6 Cage Symbol Material Guiding Features Limiting Speed (dmn value) Available for
Excellent wear and noise • Standard Series
TYN Polyamide
characteristics, especially effective
resin
Oil: 1.4 million
Ball
Grease:
guided 1.2 million
• NSKROBUST Series
(not available for

with grease lubrication 19 Series sealed type)

TR: Standard Series

Phenolic Outer Stable cage rotation in high-speed T(X): NSKROBUST Series
T

resin ring operation 2.8 million TA: BSR series (sealed
guided type)

Outer Reduction of non-repeatable run-out

TSR PPS resin ring (NRRO). Low temperature rise in 3.0 million • NSKROBUST Series
guided ultra high-speed operation due to
unique design with enhanced oil drain

7 Seal / Oil hole No symbol: Open type

V1V : Non-contact rubber seal
E34D: Direct lubrication oil holes

8 Arrangement
Universal Arrangement example
combination
Single
SU row
2
DU row DB DF DT

3
DUD row DBD DFD DTD

DBB DFF DTT
QU 4
row
DBT DFT

9 Preload EL Extra Light Preload

L Light Preload
M Medium Preload
H Heavy Preload
CP Special Preload
CA Special Clearance

10 Accuracy Class P2 ISO Class 2
P3 Dimensional ISO Class 4, rotation ISO Class 2
P4 ISO Class 4
P4Y ISO class 4 with special OD and ID tolerance

11 +Y3 O-rings on bearing outside surface (only at direct lubrication)

12 Grease MTE= MTE Grease, MTS = MTS Grease, NB5 = NBU15 Grease, YL2 = Lubcon L252 Grease

13 Grease quantity X = 15%, K = 20%, L = 30% of internal space
 SUPER PRECISION BEARINGS –
NOMENCLATURES

Angular Contact Ball Bearings - „Robust Serie“ for High Speed Applications

50 BNR 10 H T E34D SU EL P3 +Y3 MTS X

1 2 3 4 5 6 7 8 9 10 11 12

1 Nominal bore diameter = bore dimension in mm

2 Contact angle BER = 25°, BNR = 18°, BSR = 15°

3 Dimension 19 = 19 Series, 10 = 10 Series…

4 Material
Material
Type

Inner and outer ring Balls

S Bearing steel (SUJ2) Bearing steel (SUJ2)

E Bearing steel (SUJ2) Ultra long life rolling elements (EQTF)

H Bearing steel (SUJ2) Ceramic (Si3N4)
X Heat resistant steel for high-speed operation (SHX) Ceramic (Si3N4)
XE (Spinshot™II) Heat resistant steel for high-speed operation (SHX) Ceramic (Si3N4)

5 Cage see „Standard Series“ page 7

6 Seal / Oil hole No symbol: Open type
V1V : Non-contact rubber seal
E34D: Direct Lubrication oil holes „Robust Shot“

7 Arrangemenmt see „Standard Series“ page 7

8 Preload EL Extra Light Preload
L Light Preload
M Medium Preload
H Heavy Preload
CP Special Preload
CA Special Clearance

9 Accuarcy Class P2 ISO Class 2
P3 Dimensional ISO Class 4, rotation ISO Class 2
P4 ISO Class 4
P4Y ISO class 4 with special OD and ID tolerance

10 +Y3 O-rings on bearing outside surface (only „Robust Shot“)

11 Grease MTE= MTE Grease, MTS = MTS Grease, NB5 = NBU15 Grease

12 Grease quantity X = 15%, K = 20%, L = 30% of internal space

8 SUPER PRECISION BEARINGS FOR MACHINE TOOL APPLICATIONS

 Cylindrical Roller Bearings - Single Row „ROBUST Series“

N 10 11 RS _ TP KR CCO P4

1 2 3 4 5 6 7 8 9

1 N Single-row CRB (Inner Ring Guided Rollers)

2 Dimension 10 = 10 Series

3 Bore Code Bore diameter = Bore number x 5 (mm)

4 Material
Material
Type

Inner/Outer ring Rollers

RS Bearing steel (SUJ2) Bearing steel (SUJ2)
Heat resistant steel for highspeed operation Heat resistant steel for highspeed operation

RX
(SHX) (SHX)
5 Internal design No symbol = Standard

6 Cage TP = Outer ring guided PEEK cage
MR = Roller guided brass cage

7 Bore No symbol = Cylindrical bore

KR = Tapered Bore 1:12

8 Radial Clearance CC0 = Standard clearance for tapered bore (smaller clearance)
CC1 = Standard clearance for cylindrical bore (higher clearance)

9 Accuracy Class P4 ISO Class 4

P4Y ISO class 4 with special OD and ID tolerance

Internal Radial Clearance Classes

Three classes of internal radial clearance for tapered bore bearings are commonly in use: CC9, CC0 and CC1. It depends on the
operating conditions which class is most suitable. NSK has chosen to use CC0, a well-balanced clearance, as its standard
internal radial clearance class because of its advantages in terms of ease of mounting and spindle accuracy.

NSK’s recommended clearance

• CC0
With the upper limit of CC1 and the lower limit of CC9 omitted, this class offers medium radial clearance. Its range is also smaller than that of
CC1. As it is the easiest-to-use for customers who target this range, it is the recommended clearance offered for CRB with tapered bore.
 SUPER PRECISION BEARINGS –
NOMENCLATURES

Cylindrical Roller Bearings - Double Row „High Rigidity Series“

NN 30 17 _ TB KR E44 CCO P4

1 2 3 4 5 6 7 8 9

1 NN Double-row CRB (Inner Ring Guided Rollers)

2 Dimension 30 = 30 Series
39 = 39 Series

3 Bore Code Bore diameter = Bore number x 5 (mm)

4 Internal design

5 Cage TB = Roller guided PPS cage
MB = Roller guided brass cage
No symbol = Ring guided brass cage

6 Bore No symbol = Cylindrical bore
KR (K) = Tapered Bore 1:12

7 Lubrication Holes No symbol = no lubrication holes
E44 = Outer ring with oil groove and lubrication holes

8 Radial Clearance CC0 = Standard clearance for tapered bore
CC1 = Standard clearance for cylindrical bore
CC9 = Smaller clearance compared to normal

9 Accuracy Class P4 ISO Class 4

Internal Radial Clearance Classes

Three classes of internal radial clearance for tapered bore bearings are commonly in use: CC9, CC0 and CC1. It depends on the
operating conditions which class is most suitable. NSK has chosen to use CC0, a well-balanced clearance, as its standard
internal radial clearance
class because of its advantages in terms of ease of mounting and spindle accuracy.

NSK’s recommended clearance

• CC0
With the upper limit of CC1 and the lower limit of CC9 omitted, this class offers medium radial clearance. Its range is also smaller than that of
CC1. As it is the easiest-to-use for customers who target this range, it is the recommended clearance offered for CRB with tapered bore.

10 SUPER PRECISION BEARINGS FOR MACHINE TOOL APPLICATIONS

 Ball Screw Support Bearings - BSBD - Series

BS F 30 80 DDU H P2B DT

1 2 3 4 5 6 7 8

1 BS Ball Screw Support Bearing

2 Type F = Flange Type
N = No Flange Type

3 Bore Nominal bore diameter = Bore dimension in mm

4 Outer Diameter Nominal outer diameter = Dimension in mm

5 Seal Type DDU contact seal

6 Preload H Preload

7 Accuracy Class Running accuracy ISO Class 2
Other NSK Spec

8 Arrangement No symbol = One double row angular contact ball bearing
DT = Paired double row angular contact ball bearing
 SUPER PRECISION BEARINGS –
NOMENCLATURES

Ball Screw Support Bearings - TAC - Series

30 TAC 62 C _ SU H PN7C

1 2 3 4 5 6 7 8

1 30 Nominal bore diameter = Bore dimension in mm

2 Type Angular Contact Thrust Type

3 Outer Diameter Nominal outer diameter = Dimension in mm

4 Internal Design Contact Angle 60°

5 Seal Type No symbol = Open type
DDG = Contact rubber seal
V1V = Non-contact rubber seal

6 Arrangement Universal Arrangement example
combination
SU Single
row
2
DU row DB DF DT

3
DUD row DBD DFD DTD

DBB DFF DTT
4
QU row
DBT DFT

7 Preload H = Heavy preload

8 Accuracy Class PN7C = NES Class 7C (Axial runout equivalent to P2)

12 SUPER PRECISION BEARINGS FOR MACHINE TOOL APPLICATIONS

 Thrust Angular Contact ball bearing - High Speed Angular Thrust Bearing

100 BAR 10 S TYN DB L P4A

1 2 3 4 5 6 7 8

1 Nominal bore diameter = Bore dimension in mm

2 Contact angle BAR = 30°
BTR = 40°
3 Dimension 19 = 19 Series
10 = 10 Series
4 Material Material
Type
Inner and outer ring Balls

S Bearing steel (SUJ2) Bearing steel (SUJ2)
E Bearing steel (SUJ2) Ultra long life rolling elements (EQTF)
H Bearing steel (SUJ2) Ceramic (Si3N4)

5 Cage TYN = Ball guided polyamide cage
MY = Ball guided brass cage
No symbol = Outer ring guided brass cage
6 Arrangemenmt DB = Back to back arrangement open type
7 Preload EL Extra light preload
L Light preload
8 Accuarcy Class P2A = Outer diameter are NSK specific, all others ISO Class 2
P4A = Outer diameter are NSK specific, all others ISO Class 4

Thrust Angular Contact ball bearing - TAC F Series

100 TAC 20F M E44 DB EL P4A

1 2 3 4 5 6 7 8

1 100 Nominal bore diameter = bore dimension in mm

2 Type Angular Contact Thrust Ball Bearing

3 Dimension 20F = For combination NN30 Series
29F = For combination NN39 and NN49 Series

4 Cage M = Brass cage

5 Lubrication Holes No symbol = no lubrication holes
E44 = Outer ring with oil groove and lubrication holes

6 Arrangemenmt DB = Back to back arrangement

7 Preload EL = Extra light preload
L = Light preload

8 Accuarcy Class P4A = Outer diameter are NSK specific, all others ISO Class 4
P5A = Outer diameter are NSK specific, all others ISO Class 5
 SUPER PRECISION BEARINGS
INTERCHANGE GUIDE

Interchange Guide for Precision Angular Contact Bearings (Example of 25 degrees contact angle)
Standard design ISO series NSK SKF SNFA Fafnir FAG
19 79xxA5(V1V) 719xxACD SEBxxxxx3 3xx93xxWI B719xxE.(2RSD)
10 70xxA5(V1V) 70xxACD SEBxxxxx3 3xx91xxWI B70xxE.(2RSD)
02 72xxA5 72xxACD EBxxxxx3 3xx21xxWI B72xxE.(2RSD)
19 79xxA5SN24(V1V) 791xxACD/HC SEBxx/NSxxx3 3xxC93xxWI HCB719xxE.(2RSD)
10 70xxA5SN24(V1V) 70xxACD/HC EXxx/NSxxx3 3xxC91xxWI HCB70xxE.(2RSD)

High speed design ISO series NSK SKF SNFA Fafnir FAG
19 xxBER19(V1V)S 719xxACE VEBxxxxx3 3xx93xxHX(VV) HS(S)719xxE
10 xxBER19(V1V)S 70xxACE VEXxx(/S)xxx3 3xx91xxHX(VV) HS(S)70xxE
19 xxBER19(V1V)H 719xxACE/HC VEBxx/NSxxx3 3xxC93xxHX(VV) HC(S)719xxE
10 xxBER10(V1V)H 70xxACE/HC VEXxx(/S)/NSxxx3 3xxC91xxHX(VV) HC(S)70xxE
19 xxBER19(V1V)X – VEBxxXNxxx3 – XC(S)719xxE
10 xxBER10(V1V)X – VEXxx(/S)/XNxxx3 – XC(S)70xxE

Interchange Guide for Ball Screw Support Bearings

Series NSK INA SKF TIMKEN

No flange single BSNxxxxDDUHP2B ZLKNxxxx-(2Z/2RS) BEAM0xxxx-(2RZ/2RS) MMN5xxBSxxPP DM

Flange single BSFxxxxDDUHP2B ZLKFxxxx-(2Z/2RS) BEAS0xxxx-(2RZ/2RS) MMF5xxBSxxPP DM

No flange pair BSNxxxxDDUHP2BDT ZLKNxxxx-(2Z/2RS)-2AP - MMN5xxBSxxPP QM

Flange Pair BSFxxxxDDUHP2BDT ZLKFxxxx-(2Z/2RS)-2AP - MMF5xxBSxxPP QM

Interchange Guide for Precision Thrust Bearings

Thrust bearings for spindle applications – contact angle NSK SKF SNFA Fafnir FAG
30 degrees xxBAR BTMxx A/DB – – –
40 degrees xxBTR BTMxx B/DB – – –
60 degrees xxTAC 2344xx – – 2344xx

Interchange Guide for Precision Ball Screw Support Bearings Caption

Series NSK SKF SNFA Fafnir FAG Symbols in (brackets) show seal
designation when available.
Non-ISO-metric
(30 bore, 62 OD, 15 w)
30TAC62B BSD3062C BS3062 MM30BS62 BSB030062 Items in red are the manufacturers
ISO-metric identifiers of particular parameters.
BSB2030 BSA206C BS230 – 760230
(30 bore, 62 OD, 16 w)
INCH Steel balls
BSB093 BDAB634201C – MM9308WI2H –
(23.838 bore, 62 OD, 15.875 w)
Ceramic balls
Interchange Guide for Precision Cylindrical Roller Bearings Steel balls sealed
NSK SKF FAG Ceramic balls sealed
NN39xx(KR) – –
NN30xx(KR) NN30xx(K) NN30xx(K) Special material rings/
NN49xx(KR) – – Ceramic balls (sealed)
Standard
design NNU49xx(KR) NNU49xx(K) NNU49xx(K) Steel rollers
construction & rings

N10xx(KR) N10xx(K) N10xx(K) Ceramic rollers &

Special steel rings

N10xxRS(KR) – – Special steel

rollers & rings
High speed
design N10xxRXH(KR) N10xxHC5(K)(*) HCN10xx(K)(*) (*) Normal steel rings
construction This interchange should be used as
a guideline only, as manufacturers’
N10xxRX(KR) – –
designations may change without notice.

14 SUPER PRECISION BEARINGS FOR MACHINE TOOL APPLICATIONS

NSK Sales Offices – Europe, Middle East and Africa

UK
NSK UK Ltd.
Northern Road, Newark
Nottinghamshire NG24 2JF
Tel. +44 (0) 1636 605123
Fax +44 (0) 1636 643276
info-uk@nsk.com

France Middle East Spain

NSK France S.A.S. NSK Bearings Gulf Trading Co. NSK Spain, S.A.
Quartier de l’Europe JAFZA View 19, Floor 24 Office 2/3 C/ Tarragona, 161 Cuerpo Bajo
2, rue Georges Guynemer PO Box 262163 2a Planta
78283 Guyancourt Cedex Jebel Ali Downtown, Dubai, UAE 08014 Barcelona
Tel. +33 (0) 1 30573939 Tel. +971 (0) 4 804 8205 Tel. +34 93 2892763
Fax +33 (0) 1 30570001 Fax +971 (0) 4 884 7227 Fax +34 93 4335776
info-fr@nsk.com info-me@nsk.com info-es@nsk.com

Germany, Austria, Benelux, Poland & CEE Turkey

Switzerland, Nordic NSK Polska Sp. z o.o. NSK Rulmanları Orta Doğu Tic. Ltd. Şti.
NSK Deutschland GmbH Warsaw Branch Cevizli Mah. D-100 Güney Yan Yol
Harkortstraße 15 Ul. Migdałowa 4/73 Kuriş Kule İş Merkezi No:2 Kat:4
40880 Ratingen 02-796 Warszawa Kartal - Istanbul
Tel. +49 (0) 2102 4810 Tel. +48 22 645 15 25 Tel. +90 216 5000 675
Fax +49 (0) 2102 4812290 Fax +48 22 645 15 29 Fax +90 216 5000 676
info-de@nsk.com info-pl@nsk.com turkey@nsk.com

Italy South Africa

NSK Italia S.p.A. NSK South Africa (Pty) Ltd.
Via Garibaldi, 215 25 Galaxy Avenue
20024 Garbagnate Linbro Business Park
Milanese (MI) Sandton 2146
Tel. +39 02 995 191 Tel. +27 (011) 458 3600
Fax +39 02 990 25 778 Fax +27 (011) 458 3608
info-it@nsk.com nsk-sa@nsk.com

Please also visit our website: www.nskeurope.com

Global NSK: www.nsk.com

Every care has been taken to ensure the infor­m ation in this publication is accurate
but no liability can be accepted for any errors or omissions. © Copyright NSK 2023.
The contents of this publication are the copyright of the publishers.
Ref: MT-SPB/A/E/06.23