PART-NUMBERING SYSTEMS

TAPERED ROLLER BEARINGS 76 TIMKEN TAPERED ROLLER BEARING CATALOG

Prefix Suffix Inner Ring or Outer Ring Explanation EL Inner ring & outer ring Extra light series. EX Inner ring & outer ring Experimental. EXX Inner ring & outer ring Inner rings or outer rings having special characteristics differing from and non-interchangable with other inner rings or outer rings identified with the same basic part numbers. Made of special steel. F Inner ring Assembled with polymer cage. FL Inner ring & outer ring Free lateral series, no large or small ribs. FX Inner ring & outer ring Factory identification number only. G Inner ring Cage groove in bore. H Inner ring & outer ring Heavy series. Non-interchangeable with other inner rings and outer rings identified with same basic part numbers. H Inner ring Assembled with special cage, rollers, and/or internal geometry. HV Inner ring Assembled with special cage, rollers, and/or internal geometry. Made of special steel. HH Inner ring & outer ring Heavy-heavy series. Non-interchangeable with other inner rings and outer rings identified with same basic part numbers. HM Inner ring & outer ring Heavy-medium series. Non-interchangeable with other inner rings or outer rings identified with same basic part numbers. HP Inner ring Assembled with special cage and/or roller, different internal geometry. Customized for performance. HR Outer ring Special outer ring used in Hydra-Rib bearing. J Inner ring & outer ring Used alone or with other prefix letters to indicate metric bore and/or O.D. JC Inner ring & outer ring Metric series. JD Inner ring & outer ring Metric series. JE Inner ring & outer ring Metric series. JF Inner ring & outer ring Metric series. JG Inner ring & outer ring Metric series. JN Inner ring & outer ring Metric series. JP Inner ring & outer ring Metric series. JR Inner ring & outer ring Metric series. JRM Inner ring & outer ring Metric series, UNIPAC bearing. JS Inner ring & outer ring Metric series. JT Inner ring & outer ring Metric series. JU Inner ring & outer ring Metric series. JW Inner ring & outer ring Metric series. K Outer ring Double outer ring with heavy section. May have unusual features such as flange, tapered O.D., etc. K Inner ring & outer ring Through-hardened components, non-DIN 720 part numbers. K Miscellaneous K prefix with five or six digits following also used for miscellaneous components (seals, bolts, filler rings, etc.). KP Thrust bearing Cadmium plated. L Inner ring & outer ring Light series. Non-interchangeable with other inner rings and outer rings identified with same basic part numbers. L Inner ring Inner ring assembled with DUO-FACE seal. L Outer ring Loose rib. Part of unit-bearing. LA Inner ring Inner ring assembled with DUO-FACE-PLUS seal. LA, LB, Seal These suffixes are used on a basic DUO-FACE-PLUS seal number to identify the assembly LC, etc. resulting from the use of the seal with various inner rings in the series. LL Inner ring & outer ring Light-light series. LM Inner ring & outer ring Light-medium series. M Inner ring & outer ring Medium series. M Inner ring & outer ring Through-hardened components, DIN 720 part numbers, IsoClass part numbers. N Inner ring Bock- or Gilliam-type bearings. NA Inner ring Two inner rings mated with double outer ring to form double-row non-adjustable bearing. Non-interchangeable with other inner rings having same basic part numbers which may vary in bore, O.D., and width dimensions. NA Outer ring Etched electric pencil on double outer rings mated with two NA-type single inner rings to form double-row non-adjustable bearings.