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Ball Bearing Numbering System

MATERIAL BEARING TYPE BEARING PART NO RETAINER SEAL AND SHIELDS RADIAL CLEARANCE TOLERANCE CLASS
Ex.1 688 J ZZ MC3
Ex.2 F 608 TW 2RS MC4 P6
Ex.3 MR 52 W ZZ MC2 P5
Ex.4 S MF 128 W TTS MC3 P6
Ex.5 S ER 1458 W ZZS C0 A3
Ex.6 6025 RJ 2RS C3 p5
Ex.7 F 6006 W 2RU C0
Ex.6 6025 RJ 2RS C3 p5
Ex.7 F 6706 W 2RY C0
Ex.8 S R 144 J ZZS MC4 A5P
Ex.9 R 10 RJ ZZ C2
Ex.10 F 3-8M TP
MATERIAL
HIGH CARBON CHROMIUM STEEL
AISI52100 -NO SYMBOL
STAINLESS STEEL
S
BEARING TYPE
  • INCH: R
  • INCH WITH FLANGE: FR
  • INCH WITH EXTENDED INNER RING: RW
  • INCH WITH EXTENDED INNER RING AND FLANGE: FRW
  • METRIC STANDARD: NO SYMBOL
  • METRIC WITH FLANGE: F
  • SPECIAL METRIC: MR
  • SPECIAL METRIC WITH FLANGE: MF
BEARING PART NO
The basic number is written.
RETAINER
  • STEEL RIBBON TYPE : J
  • STEEL CROWN TYPE: W
  • NYLON CROWN TYPE: TW
  • STEEL RIVET TYPE: RJ
  • FULL COMPLEMENT: V
SEALS AND SHIELDS
  • TEFLON SEAL WITH SNAP RING: TTS
  • STEEL SHIELD WITH SNAP RING: ZZS
  • PRESSED STEEL SHIELD: ZZ
  • CONTACT RUBBER SEAL: 2RS
  • NON-CONTACT RUBBER SEAL: 2RU
RADIAL CLEARANCE
  • STANDARD: C2,CN(C0), C3, C4, C5
  • MINIATURE: MC1,MC2,MC3,MC4,MC5,MC6
TOLERANCE CLASS
  • ABEC1: NO SYMBOL
  • ABEC3: 3
  • ABEC5P: 5P
  • ABEC7P: 7P
  • ISO CLASS0: NO SYMBOL
  • ISO CLASS6: P6
  • ISO CLASS5: P5
  • ISO CLASS4: P4