NSK miniature ball bearing nomenclature

The nomenclature of NSK miniature ball bearings are part of NSK bearing nomenclature, that be alphanumeric combinations that indicate the NSK bearing type, boundary dimensions, dimensional and running accuracies, internal clearance, and other related specifications.

Examples of NSK miniature ball bearings
Examples of NSK miniature ball bearings

NSK basic number nomenclature

NSK bearing series symbols Bore number or size number Contact angle symbol
Symbol Meaning Number Meaning Symbol Meaning
68 Single-row deep groove ball bearings 1 Bearing bore 1mm Angular contact ball bearings
69 2 Bearing bore 2mm A Standard contact angle of 30°
60 3
...
Bearing bore 3mm A5 Standard contact angle of 25°
62 1X Bearing bore 1.5mm B Standard contact angle of 40°
63 2X
...
Bearing bore 2.5mm C Standard contact angle of 15°
F68 Deep groove ball bearings with flanged outer rings 1 Bearing bore 1mm  
F69 2 Bearing bore 2mm
F60 3
...
Bearing bore 3mm
F62 1X Bearing bore 1.5mm
F63 2X
...
Bearing bore 2.5mm
70 Single-row angular contact ball bearings  
72
Special metric design
MR Single row deep groove ball bearings 84 Brg O.D. 8mm
Brg bore 4mm
 
MF Deep groove ball bearings with flanged out rings 148
...
Brg O.D. 14mm
Brg bore 8mm
SMT Thin-section deep groove ball bearings 41X Brg O.D. 4mm
Brg bore 1.2mm
    82X
...
Brg O.D. 8mm
Brg bore 2.5mm
Inch disign
R single row deep groove ball bearings 133 Brg O.D. 4.762mm(3/16 inch)
Brg bore 2.38mm(3/32 inch)
 
SR..X Ball bearings for synchros 155 Brg O.D. 7.938mm(5/16 inch)
Brg bore 3.967(5/32 inch)
RW Deep groove ball bearings with extended inner rings 2
...
Brg O.D. 9.525mm(3/8 inch)
Brg bore 3.175mm(1/8 inch)
FRW Deep groove ball bearings with extended inner rings, flanged    

NSK supplementary number (suffixes)

Internal design symbol

  • A: Internal design differs
  • B: From standard one

Material symbol

  • Omitted: high carbon chromium bearing steel SUJ 2 Equivalent to ASTM A295 52100
  • h: Stainless steel Equivalent to SAE J405 51440C
  • s: Stainless steel for special metric and inch designs "S" is prefix to series symbol

Cage symbol

  • J: Pressed steel ribbon cage
  • W: pressed steel snap cage
  • T12 / T1X: Plastic snap cage

Seals, shields symbol

  • Z / Z1: Shield on one side only
  • ZZ/ZZ1: shields on both sides
  • D: contact rubber seal on one side only
  • DD: contact rubber seal on both side
  • V: non-contact rubber seal on one side only
  • VV: non-contact rubber seal on both side

Internal clearance symbol

  • MC1: clearance less than MC2
  • MC2: clearance less than MC3
  • MC3: upgrade normal clearance
  • MC4: clearance greater than MC3
  • MC5: clearance greater than MC4
  • MC6: clearance greater than MC5

Noise level symbol

  • Omitted: standard
  • E: Quieter than standard
  • ER: Quieter than E

Accuracy class symbol

  • Omitted: Normal
  • P6: class 6
  • P5: class 5
  • P4: class 4
  • Omitted: ANSI / ABMA ABEC 1
  • 3: ANSI / ABMA ABEC 3
  • 5P: ANSI / ABMA instrument ball bearings inch design CLASS 5P
  • 7P: ANSI / ABMA instrument ball bearings design CLASS 7P
  • 9P: ANSI / ABMA instrument ball bearings inch design 9P

Torque symbol

  • Omitted: Standard
  • L: low torque

Special specification symbol

  • U1: special specification
  • U2...
  • UC1: Bore diameter is sorted into two groups
  • UC2: outside diameter is sorted into two groups
  • UC3: both bore and outside diameters are sorted into two groups

Lubricant symbol

  • AF2: AEROSHELL FLUID 12
  • NS7: NS HI-LUBE
  • PS2: MULTEMP PS No.2

Lubricant quantity symbol

  • Q: oil soaking
  • K: grease packed less than L
  • L: standard grease packing quantity
  • S: grease packed more than L
  • H: grease packed more than S
  • M: grease packed more than H

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