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AS9120 & ISO9001 Approved

TIMKEN BEARING part number system

Most Timken symbols are die stamped as part of the bearing number, however there are many cases where our automotive and industrial applications require special considerations in bearing designs and tolerances. To be certain future cone and cup replacements are made correctly, the factory supplements imprinted identifications with electric penciling to add prefixes and suffixes to the imprinted part numbers. These additional markings become important to the user for proper bearing identification and replacement.

Part number system

PrefixSuffixDefinition
..EXAMPLE: CN-07237
.ACONE DIFFERENT BORE FROM STANDARD BASIC PART NUMBER. EXAMPLES: 495A VS 495 (NON-INTERCHANGEABLE) 567A VS 567 (NON-INTERCHANGEABLE)
.ACONE DIFFERENT RADIUS FROM STANDARD BASIC PART NUMBER. EXAMPLES: 350A VS 350 (350 HAS LARGER RADIUS) 464A VS 464 (464 HAS LARGER RADIUS)
.ACUP DIFFERENT O.D. FROM STANDARD BASIC PART NUMBER. EXAMPLE: 493A VS 493 (NON-INTERCHANGEABLE)
.ACUP DIFERENT RADIUS FROM STANDARD BASIC PART NUMBER. EXAMPLE: 452A VS 452 (452A HAS LARGER RADIUS)
.ACUP DIFFERENT LENGTH FROM STANDARD BASIC PART NUMBER. EXAMPLE: 394A VS 394 (NON-INTERCHANGEABLE)
.AACONE AND CUP DIFFERENT BORE OR O.D., OR LENGTH AND RADIUS FROM STANDARD BASIC PART NUMBER. EXAMPLE: 495AA VS 495A OR 495
.ABCUP FLANGED CUP (NON-INTERCHANGEABLE WITH STANDARD BASIC PART NUMBER) . EXAMPLE: 572AB VS 572
.ACDIFFERENT CUP WIDTH OR RADIUS FROM BASIC PART NUMBER.
.ACCUP DIFFERENT O.D. OR LENGTH AND RADIUS FROM STANDARD BASIC PART NUMBER) . EXAMPLE: 453AC VS 453 (NON-INTERCHANGEABLE)
.ADCUP DOUBLE CUP (NON-INTERCHANGEABLE WITH STANDARD BASIC PART NUMBER) . EXAMPLE: 592AD VS 592 (592 IS SINGLE CUP)
.ADWDOUBLE CONE PILOTS AND SLOTS EACH END, HOLES IN LARGE RIB.
.AHASSEMBLED WITH SPECIAL CAGE, ROLLERS AND/OR INTERNAL GEOMETRY.
.ASDIFFERENT BORE, OD, WIDTH OR RADIUS FROM BASIC PART NUMBER.
.ASCONE AND CUP DIFFERENT BORE OR O.D. OR LENGTH AND RADIUS FROM STANDARD BASIC PART NUMBER. EXAMPLES: 372AS VS 372 (NON-INTERCHANGEABLE) 385AS VS 385 (NON-INTERCHANGEABLE)
.AVMADE OF SPECIAL STEEL.
.AWKEYWAY OR SLOTTED CONE RACE OR OUTER RACE.
.AWCONE AND CUP KEYWAY OR SLOTTED CONE OR CUP. EXAMPLE: 389AW VS 389A (NON-INTERCHANGEABLE)
.AXDIFFERENT BORE, OD, WIDTH, OR RADIUS FROM BASIC PART NUMBER.
.AXCONE AND CUP DIFFERENT BORE OR O.D. OR LENGTH AND RADIUS FROM STANDARD BASIC PART NUMBER. EXAMPLES: 453AX VS 453 (NON-INTERCHANGEABLE) 495AX VS 495 (NON-INTERCHANGEABLE)
.AXDISO OUTER RACE - DOUBLE OUTER RACE WITHOUT OIL HOLES OR GROOVE.
.BCUP FLANGED CUP (NON-INTERCHANGEABLE WITH STANDARD BASIC PART NUMBER) EXAMPLE: 572B VS 572
.BCONE CONE USING BRASS CAGE.
.BSCUP FLANGED CUP (NON-INTERCHANGEABLE WITH STANDARD BASIC PART NUMBER) . EXAMPLE: 332BS VS 332
.BWCUP FLANGED CUP WITH SLOT (NON-INTERCHANGABLE WITH STANDARD BASIC PART NUMBER) . EXAMPLE: 432BW VS 432
.CCUP DIMENSIONALLY DIFFERENT FROM BASIC PART NUMBER (NON-INTERCHANGEABLE).
.CSINGLE CONE RACE, ENVELOPE DIMENSION SAME AS BASIC PART NUMBER.
.CADIFFERENT INTERNAL GEOMETRY.
.CDDOUBLE CUP WITH OIL HOLES AND GROOVE. ONE HOLE COUNTER-BORED FOR LOCKING PIN.
.CPCONE AND CUP FLASH CHROME PLATED. OTHERWISE, INTERCHANGEABLE WITH STANDARD BASIC PART NUMBER. EXAMPLES: 18200CP (SUFFIX ELECTRIC PENCIL ETCHED) 18337CP (SUFFIX ELECTRIC PENCIL ETCHED)
.CRCONE AND CUP RIB CUP BEARING SERIES.
.CXDIMENSIONALLY DIFFERENT FROM BASIC PART NUMBER (NON-INTERCHANGEABLE).
.DCONE AND CUP DOUBLE CONE OR DOUBLE CUP (NON-INTERCHANGEABLE WITH STANDARD BASIC PART NUMBER) . EXAMPLES: 581D VS 581 (581 IS SINGLE CONE) 572D VS 572 (572 IS SINGLE CONE)
.DACONE DOUBLE CONE (NON-INTERCHANGEABLE WITH CONES HAVING SAME BASIC PART NUMBER) . EXAMPLE: 378DA VS 378DE
.DACUP SPHERICAL O.D. DOUBLE CUP (NON-INTERCHANGEABLE WITH STANDARD BASIC PART NUMBER OR OTHER DOUBLE CUPS HAVING SAME BASIC NUMBERS) . EXAMPLES: 472D VS 472DD
.DBCUP DOUBLE CUP WITH FLANGE (NON-INTERCHANGEABLE WITH STANDARD BASIC PART NUMBER OR OTHER DOUBLE CUPS HAVING SAME BASIC NUMBERS) . EXAMPLE: 09195DB VS 09195
.DCCUP DOUBLE CUP WITH HOLE FOR LOCKING PIN.
.DDCONE AND CUP SPECIAL LONG DOUBLE CONE OR CUP (NON-INTERCHANGEABLE WITH STANDARD BASIC PART NUMBER OR OTHER DOUBLE PARTS HAVING SAME BASIC NUMBERS) . EXAMPLE: 563DD
.DEDOUBLE CONE OR DOUBLE CUP HAVING DIFFERENT DIMENSIONS OR OTHER CHARACTERISTICS FROM SINGLE AND DOUBLE PARTS IDENTIFIED WITH THE SAME BASIC PART NUMBER.
.DGWCONE DOUBLE CONE WITH PRESSURE REMOVAL GROOVE IN BORE, AND HAVING FACE SLOTS.
.DHDOUBLE CONE RACE WITH SPECIAL CAGE, ROLLERS AND/OR INTERNAL GEOMETRY.
.DPCONE DOUBLE CONE WITH PULLER GROOVE.
.DRCUP DOUBLE CUP FOR RIB CUP SERIES (NON-INTERCHANGEABLE WITH SINGLE AND DOUBLE CUPS IDENTIFIED WITH SAME BASIC NUMBER) .
.DSCUP CROWNED O.D. DOUBLE CUP (NON-INTERCHANGEABLE WITH OTHER CUPS HAVING SAME BASIC PART NUMBERS) . EXAMPLE: 95927DS VS 95927D
.DTCUP TAPERED O.D. DOUBLE CUP (NON-INTERCHANGEABLE WITH OTHER CUPS HAVING SAME BASIC PART NUMBERS) . EXAMPLE: 473DT
.DVDOUBLE CONE OR DOUBLE CUP RACE MADE OF SPECIAL STEEL.
.DWCONE AND CUP DOUBLE CONE OR DOUBLE CUP WITH KEYWAY OR SLOT (NON-INTERCHANGEABLE WITH CONES OR CUPS IDENTIFIED WITH SAME 'BASIC PART NUMBERS) . EXAMPLES: 378DW VS 378DA 128170DW VS 128170DA
.DXCUP ADAPTOR FOR SPHERICAL OR STRAIGHT O.D. CUP. EXAMPLE: 128196DX (ADAPTOR FOR 128170DA CUP)
.DXCUP THREADED O.D. DOUBLE CUP (NON-INTERCHANGEABLE WITH CUPS IDENTIFIED WITH SAME BASIC PART NUMBERS) .
.ECONE AND CUP CONES OR CUPS HAVING SPECIAL CHARACTERISTICS DIFFERING FROM AND NON-INTERCHANGEABLE WITH OTHER CONES OR CUPS IDENTIFIED WITH THE SAME BASIC PART NUMBERS . EXAMPLES: 6E (EXTRA LARGE O.D.) 742E (ROTARY GROUND FRONT FACE)
.EDCUP DOUBLE CUP (NON- INTERCHANGEABLE WITH OTHER CUPS IDENTIFIED WITH SAME BASIC PART NUMBERS) . EXAMPLE: 384ED VS 384AD
.FCONE ASSEMBLED WITH POLYMER CAGE.
.GCONE RETAINER GROOVE IN BORE.
.HCONE ASSEMBLED WITH SPECIAL CAGE, ROLLERS AND/OR INTERNAL GEOMERY.
.HRSPECIAL CUP USED ON 'HYDRA-RIB' BEARING.
.KCONE AND CUP FACTORY IDENTIFICATION ONLY. NOT PART OF NUMBER AND UNRELATED TO PHYSICAL DIMENSIONS. (INTERCHANGEABLE WITH OTHER CONES AND CUPS HAVING SAME BASIC PART NUMBERS) .
.LCONE CONE ASSEMBLED WITH DUO-FACED SEALS.
.MMCONE AND CUP FACTORY IDENTIFICATION ONLY. NOT PART OF NUMBER AND UNRELATED TO PHYSICAL DIMENSIONS (INTERCHANGEABLE WITH OTHER CONES AND CUPS HAVING SAME BASIC PART NUMBERS) .
.NACUP SUFFIX ELECTRIC PENCIL ETCHED ON DOUBLE CUPS MATED WITH TWO "NA" TYPE SINGLE CONES TO FORM DOUBLE ROW NON-ADJUSTABLE BEARINGS.
.NCCUP CUSHIONED CUP (USUALLY NEOPRENE) .
.NRCONE "NA" TYPE RIBLESS CONE FOR RIB CUP SERIES.
.NWCONE "NA" TYPE CONE WITH SLOTTED FRONT FACE.
.NXCONE LAPPED FRONT FACE
.PCONE PULLER GROOVE.
.RCONE AND CUP BOCK TYPE BEARING . EXAMPLES: 6358-R AND 6552-R
.RBCUP SNAP RING ON O.D. EXAMPLES: 3822-RB, 15523-RB
.SCONE AND CUP SPECIAL FEATURE BEARING. NOT INTERCHANGEABLE WITH BEARINGS HAVING SAME BASIC PART NUMBERS.
.SACONE AND CUP SPECIAL FEATURE BEARING. NOT INTERCHANGEABLE WITH BEARINGS HAVING SAME BASIC PART NUMBERS.
.SBCONE CONE WITH BRASS CAGE.
.SBCUP FLANGED CUP.
.SCCONE CONE WITH SQUARE BORE.
.SDCONE AND CUP DOUBLE CONE WITH SQUARE BORE OR DOUBLE CUP.
.SHSPECIAL FEATURE BERING, WITH SPECIAL CAGE, ROLLERS AND/OR INTERNAL GEOMETRY (NON-INTERCHANGEABLE WITH BEARINGS HAVING SAME BASIC PART NUMBERS).
.SWCONE AND CUP SLOT OR KEYWAY. NOT INTERCHANGEABLE WITH BEARINGS HAVING SAME BASIC PART NUMBERS.
.TCONE TAPERED BORE.
.TCUP TAPERED O.D.
.TACONE TAPERED BORE "NA" TYPE CONE.
.TACUP TAPERED O.D.
.TBCONE TAPERED BORE CONE WITH BRASS CAGE.
.TDCONE TAPERED BORE DOUBLE CONE.
.TDEDOUBLE CONE WITH TAPERED BORE AND EXTENDED RIB.
.TDHDOUBLE CONE WITH TAPERED BORE, SPECIAL CAGE, ROLLERS, OR INTERNAL GEOMETRY.
.TDLCONE TAPERED BORE, DOUBLE CONE, WITH INTERLOCK FEATURE.
.TDVDOUBLE CONE WITH TAPERED BORE. MADE OF SPECIAL STEEL.
.TECONE TAPERED BORE CONE WITH EXTENDED RIB.
.TEVSINGLE CONE, TAPERED BORE, EXTENDED LARGE RIB. MADE OF SPECIAL STEEL.
.TLCONE TAPERED BORE WITH INTERLOCK FEATURE.
.TLECONE TAPERED BORE WITH INTERLOCK FEATURE AND EXTENDED WIDTH.
.TPCONE TAPERED BORE CONE WITH PULLER GROOVE.
.TWCONE AND CUP TAPERED CONE BORE OR CUP O.D. WITH SLOTS OR KEYS.
.UCONE OR CUP - BASIC SERIES PART NUMBER, UNITIZED, SELF-CONTAINED.
.VCONE AND CUP OBSOLETE TYPE BEARING DESIGN. NOT PART OF NUMBER AND NO RELATION TO PHYSICAL DIMENSIONS.
.V7ECONE AND CUP EXTENDED KEYWAY CONE OR CUP.
.WCONE AND CUP SLOT OR KEYWAY.
.WCONE TYPE 12 SLOT.
.WACONE TYPE SI SLOT.
.WBCONE TYPE 13 SLOT.
.WCCONE WITH SLOTS OR KEYWAYS.
.WDCONE SPECIAL TYPE SLOT.
.WECONE TYPE #4 SLOT.
.WSCONE OR CUP - SLOTS OR KEYWAYS.
.XCONE SLOT OR KEYWAY.
.XCONE AND CUP SPECIAL FEATURE BEARING. NOT INTERCHANGEABLE WITH BEARINGS HAVING SAME BASIC PART NUMBERS. EXAMPLES: 350X - SMALLER BORE 496X - LARGER BORE 525X - DIFFERENT RADIUS
.XDDOUBLE CUP, NO OIL HOLES OR GROOVE.
.XPSPECIAL CONE STEEL AND PROCESS.
.XWCONE SLOTTED.
.XXSINGLE CONE OR SINGLE CUP MADE OF SPECIAL STEEL.
.YDDOUBLE CUP WITH OIL HOLES, NO GROOVE.
.ZCUP OR CONE CLOSE STAND PART.
A.CONE AND CUP STANDARD BASIC SERIES PART NUMBER EXAMPLES: A2031 CONE, A2126 CUP
CNCCUP DIMENSIONALLY DIFFERENT FROM STANDARD BASIC PART NUMBER. (NON- INTERCHANGEABLE) . EXAMPLE: 534C VS 534 CUP NEOPRENE CUSHIONED CUP.
EE.CONE DOUBLE RIB - CLOSE GUIDED ROLLERS (NON-INTERCHANGEABLE WITH OTHER CONES IDENTIFIED WITH SAME BASIC PART NUMBERS) . EXAMPLE: EE141250D VS 14125OD
EH.CONE AND CUP EXTRA HEAVY SERIES.
EL.CONE AND CUP EXTRA LIGHT SERIES.
EX.CONE AND CUP EXPERIMENTAL .
F.CONE AND CUP FACTORY IDENTIFICATION ONLY. NOT PART OF NUMBER AND AND UNRELATED TO PHYSICAL DIMENSIONS (INTERCHANGEABLE WITH OTHER CONES AND CUPS HAVING SAME BASIC PART NUMBERS) .
H.CONE AND CUP HEAVY SERIES (NON-INTERCHANGEABLE WITH OTHER CONES AND CUPS IDENTIFIED WITH SAME BASIC PART NUMBERS) . EXAMPLES: H242649 H242610
HH.CONE AND CUP HEAVY-HEAVY SERIES (NON-INTERCHANGEABLE WITH OTHER CONES AND CUPS IDENTIFIED WITH SAME BASIC PART NUMBERS) . EXAMPLES: HH926749 VS HM926749 HH926710 VS HM926710
HM.CONE AND CUP HEAVY-MEDIUM SERIES (NON-INTERCHANGEABLE WITH OTHER CONES AND CUPS IDENTIFIED WITH SAME BASIC PART NUMBERS) . EXAMPLES: HM926749 VS HH926749 HM926710 VS HH926710
J.CONE AND CUP STANDARD BASIC SERIES PART NUMBER, METRIC CONE BORE AND CUP O.D. EXAMPLES: JLM104948 VS JLM104910 CUP JH307749 CONE VS JH307710 CUP
L.CONE AND CUP LIGHT SERIES. (NON-INTERCHANGEABLE WITH OTHER CONES AND CUPS IDENTIFIED WITH SAME BASIC PART NUMBERS.
LL.CONE AND CUP LIGHT-LIGHT SERIES.
LM.CONE AND CUP LIGHT-MEDIUM SERIES.
M.CONE AND CUP MEDIUM SERIES.
N.CONE BOCK OR GILLIAM TYPE BEARINGS.
NANACONE TWO CONES MATED WITH DOUBLE CUP TO FORM DOUBLE ROW NON-ADJUSTABLE BEARING. (NON-INTERCHANGEABLE WITH OTHER CONES HAVING SAME BASIC PART NUMBERS WHICH MAY VARY IN BORE, O.D. LENGTH DIMENSIONS.
R.CONE AND CUP GILLIAM REPLACEMENT SERIES. (NON-INTERCHANGEABLE WITH OTHER CONES AND CUPS IDENTIFIED WITH SAME BASIC NUMBER) .
RC.CONE AND CUP SPECIAL RIBBED CUP BEARING.
SX.SPECIAL EXPERIMENTAL.
T.CONE THRUST BEARING ASSEMBLIES. EXAMPLES: T-76 , T-176, T-811
TC.CONE THRUST BEARING ASSEMBLE. EXAMPLE: TC-702
U.CONE AND CUP STANDARD BASIC SERIES PART NUMBER, UNITIZED SELF-CONTAINED BEARING. EXAMPLE: U399 CONE, U360L CUP
XC.CONE AND CUP LIMITED PRODUCTION BEARINGS TO WHICH STANDARD SERIES PART NUMBERS HAVE NOT BEEN ASSIGNED.

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