Bearing Numbering System

Data downloadable in PDF format:

Bearing Numbering System – Chart

  MATERIAL BEARING
TYPE 		BEARING
PART NO 		MATERIAL RETAINER SEAL AND
SHIELDS 		RADIAL
CLEARANCE 		TOLERANCE
CLASS 		LUBRICATION
Ex.1     688 H J ZZ MC3   SRL
Ex.2   F 608   TW 2RS MC4 P6 SRL
Ex.3   MR 52   W ZZ MC2 P5 AF2
Ex.4 S MF 128   W TTS MC3 P6 SRL
Ex.5 S ER 1458   W ZZS C0 A3 SRL
Ex.6     6205 H RJ 2RS C3   AV2
Ex.7   F 6706   W 2RU C0   SRL
Ex.8 S R 144   J ZZS MC4 A5P AF2
Ex.9   R 10   RJ ZZ C2   AF2
Ex.10   F 3-8M   TP       AF2
Material

HIGH CARBON CHROMIUM STEEL
SUJ2 -NO SYMBOL

STAINLESS STEEL
STANDARD METRIC—H
INCH AND MR SERIES—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
LUBRICATION

CODE

  • MULTEMP SRL: (GREASE) : SRL
  • ALVANIA NO.2: (GREASE) : AV2
  • BEACON 325: (GREASE) : B32
  • AERO SHELL FLUID 12: (OIL) : AF2