NSK is one of the leading bearing manufacturers with a long tradition of patent applications for machine parts. NSK not only concentrates on the development of new technologies but also on continuous quality improvement based on the integrated technology platform of tribology, materials technology, analysis, and mechatronics.

With more than 20,000 employees worldwide and over 64 production plants. NSK manufactures approximately three million new bearings per day (from miniature bearings with a one-millimetre bore to bearings with a diameter of five meters).

With so many many types of bearings and part numbers, bearing order codes are made up of a combination of letters and numbers. This alphanumeric combination denotes the type, size, and structure of the bearing.

Within each order code, a distinction is made between the basic designation and any suffixes and/or prefixes. The basic designation indicates the bearing type and the hole size. These basic designations are defined in the German Standard DIN 623 and the corresponding ISO standard.

For most types of bearings, the basic designation is made up of numbers, but some are alphanumeric. Prefixes and suffixes denote special modifications, for example, if internal clearance or precision deviates from the norm.

The use of prefixes and suffixes are only partially standardized. Suffixes differ the most, with the various bearing manufacturers using different codes for certain modifications. This guide explains the various bearing codes used by NSK and RHP and helps you compare them with designations from other manufacturers.

NSK Suffixes and Bearing Part Number System

NSK bearings use a large number of suffixes to indicate structural modifications in different types of bearings.

Specifically, suffixes provide information about:

  • Meter type
  • Internal layout
  • Stamp
  • Used lubricant
  • Tolerances
  • Interior space
  • External design

NSK bearing suffixes.

The table below shows the complete list of suffixes

Suffix Definition
+AHWITHDRAWAL OR REMOVAL SLEEVE.
+HADAPTER SLEEVE.
+HJSTABILIZING RING/ CYLINDRICAL ROLLER BEARINGS.
+KOUTER RING SPACER, TAPERED ROLLER BEARINGS.
+KLINNER AND OUTER RING SPACER, TAPERED ROLLER BEARINGS.
+LINNER RING SPACER, TAPERED ROLLER BEARINGS.
-8BORE SIZE, 1/2 INCH DIAMETER.
-10BORE SIZE, 5/8 INCH DIAMETER.
-100BORE SIZE, 1 INCH DIAMETER.
-107BORE SIZE, 1-7/16 INCH DIAMETER.
-12BORE SIZE, 3/4 INCH DIAMETER.
-13MBORE SIZE, 13 MM DIAMETER.
-14BORE SIZE, 7/8 INCH DIAMETER.
-625BORE SIZE, 0.6250 INCH DIAMETER.
-8BORE SIZE, 1/2 INCH DIAMETER.
11/8 FULL.
21/4 FULL.
33/8 FULL.
41/2 FULL.
55/8 FULL.
63/4 FULL.
77/8 FULL.
8100 PERCENT FULL
9DIP.
AINTERNAL REDESIGN.
A30 DEGREE CONTACT ANGLE, ANGULAR CONTACT BALL BEARINGS.
ABANDOK B.
ACANDOK C.
AEAEROSHELL 15.
AE3ABEC-3 TOLERANCE.
AE5ABEC-5 TOLERANCE.
AFAEROSHELL 17.
AKANDOK 260.
ANANDEROL L-423 OIL.
ARAEROSHELL 5.
ASAEROSHELL 7.
ATAEROSHELL 16.
AWAEROSHELL 22.
AXAEROSHELL 6.
BINTERNAL REDESIGN.
B40 DEGREE CONTACT ANGLE, ANGULAR CONTACT BALL BEARINGS.
BSX8388A (BATCO) .
BTBEACON 325.
CINTERNAL REDESIGN.
C15 DEGREE CONTACT ANGLE, ANGULAR CONTACT BALL BEARINGS.
C2TIGHT FIT, AFBMA CLASS 2.
C3LOOSE FIT, AFEMA CLASS 3.
C4EXTRA LOOSE FIT, AFBMA CLASS 4.
CASPHERICAL ROLLER BEARING.
CCSTANDARD, NON-INTERCHANGEABLE FIT, CYLINDRICAL ROLLER BEARINGS.
CC2LESS THAN STANDARD NON-INTERCHANGEABLE FIT, CYLINDRICAL BEARINGS.
CC4GREATER THAN CC3 FIT, CYLINDRICAL ROLLER BEARINGS.
CCSGREATER THAN CC FIT, CYLINDRICAL ROLLER BEARINGS.
CDSPHERICAL ROLLER BEARING.
CEELECTRIC MOTOR QUALITY BEARING AND FIT.
CHCHEVRON OHT.
CHSWATER PUMP BEARING WITH SLINGER RING.
CMELECTRIC MOTOR QUALITY BEARING AND FIT.
CTELECTRIC MOTOR QUALITY BEARING AND FIT.
DSTEEP CONTACT ANGLE, TAPERED ROLLER BEARING.
DADOW CORNING DC99 – NO. 2.
DBSUPERNAL GREASE NO. 72832.
DBDOW CORNING FS3451 – NO. 2.
DBDUPLEX PAIR, BACK-TO-BACK MOUNTING.
DDUTWO RUBBER CONTACT SEALS.
DEDC41.
DFDC44.
DHDOW CORNING 510.
DHWATER PUMP BEARING, DULITED AND HANED PARTS.
DPDUPLEX PAIR, FACE-TO-FACE MOUNTING.
DSDC FS 1291.
DTDC33.
DTDUPLEX PAIR, TANDEM MOUNTING.
DUSINGLE RUBBER CONTACT SEAL.
DVDC FS 1292.
EBEARING WITH SLOT OR KEYWAY.
E100SPECIAL BEARINGS (MIL-B-17931C) .
E101GREASE QUANTITY AND TEFLON SEAL ELEMENT, SPECIAL.
E4OUTER RING RELUBRICATION FEATURE, SPHERICAL BEARINGS.
ES11SPECIAL GREASE VOLUME.
ES12SPECIAL CARTON MARKING.
ES13SPECIAL CORNER RADIUS.
ES15SPECIAL END PLAY.
ES16SPECIAL PROCESSING.
ES17SPECIAL CLEANING.
ES18RADIAL PLAY LIMITS SPECIAL.
ES19SPECIAL CLEANING, LUBRICATION.
ES20RADIAL PLAY, GAGING LOADS, SPECIAL.
ES21HEAT STAB, FOR 325°F OPERATION.
ES22XT RADIAL PLAY, SPECIAL.
ES24(MIL-B-17931A) , AMENDMENT 2, LOW NOISE LEVEL.
ES25HIGH-SPEED TEST.
ES26DULITE PROCESSED.
ES27END PLAY AND TILT LIMITS, SPECIAL.
ES28DULITE PROCESSED.
ES29SPECIAL SHIELD MARKING.
ES3100 PERCENT SPEED TEST, LOW NOISE LEVEL.
ES30QUALITY AUDIT, SPECIAL.
ES31TORQUE LIMITS, SPECIAL.
ES32SPECIAL INSPECTION.
ES33LOW NOISE LEVEL.
ES34ULTRASONIC CLEANING.
ES35FLUSHNESS TOLERANCE SPECIAL.
ES36SPECIAL IDENTIFICATION.
ES37DULITE SHIELD.
ES38SPECIAL END PLAY.
ES39ELECTRONIC NOISE TESTING.
ES40HEAT STABILIZED, SPECIAL.
ES41STABILIZATION FOR 375 DEG F OPERATION.
ES42«HS 2» MARKING ON OUTER.
ES43GREASE CONTROL, SPECIAL.
ES44REDUCED INSPECTION LIMITS.
ES45LAPPED INNER FACE.
ES46OVERSIZE O.D. ‘ S.
ES47SPECIAL FOR RAILROAD APPLICATION.
ES48SPECIAL O.D. TOLERANCE.
ES49SHIELD IDENTIFICATION, SPECIAL.
ES50REWORK IDENTIFICATION.
ES51SPECIAL TOLERANCES.
ES52SOLVENT CLEAN PARTS , SPECIAL .
ES53SPECIAL PROCESSING.
ES54SPECIAL FOR RAILROAD APPLICATIONS.
ES55SPECIAL 77R6. /
ES56RADIAL LOOSENESS CHECK ,_ SPECIAL .
ES57SPECIAL O.D. CORNER.
ES58HIGH POINT MARKING ON INNER RING.
ES59O.D. CODING.
ES6CERTIFIED QUALITY CONTROL.
ES60SPECIAL GREASING.
ES61ES-41 AND SPECIAL GREASING.
ES62SHIELD OR SEAL ASSEMBLY, SPECIAL.
ES63SPECIAL 7038.
ES65SPECIAL MARKING INSTRUCTIONS.
ES66SPECIAL IDENTIFICATION.
ES67SPECIAL GREASE AND QUANTITY.
ES68SPECIAL GREASE QUANTITY.
ES7SPECIAL PROCESS, SPECIAL CARTON MARKING.
ES70SPECIAL MARKING.
ES71SPECIAL WIDTH TOLERANCE.
ES72SPECIAL LUBRICATION.
ES73SPECIAL PROCESSING.
ES74SPECIAL RING MARKING.
ES75BEARINGS SERIAL NUMBERED.
ES82RELUBE TYPE SHIELDS.
ES83ELECTRO-GALVANIZING .
ES84SPEC, INTERNAL CLEARANCE AND SPECIAL GREASE QUANTITY.
ES85SPECIAL GREASE QUANTITY.
ES9(MIL-B-17931A) , AMENDMENT 1, LOW NOISE LEVEL.
ESIHAND SPIN TEST, LOW TORQUE.
ESSSHIELD CLEARANCE 0.003 INCH, SPEC, TOLERANCE.
ESSLOW NOISE LEVEL.
FSINGLE SHIELD, DOUBLE-ROW BALL BEARINGS.
FFTWO SHIELDS, DOUBLE-ROW BALL BEARINGS.
FMFISKE LUBRIPLATE – MULTI-LUBE A.
FTFISKE LUBRIPLATE 210.
GSNAP RING ON BEARING.
GNRSNAP RING GROOVE ON BEARING, NO SNAP RING.
GSSNAP RING ON SAME SIDE OF BEARING AS SHIELD.
HPHUMBLE OIL UNIVIS P38.
HXHUMBLE OIL UNIREX NO. 2.
JPRESSED STEEL RETAINER, TWO PIECE RIBBON TYPE.
KTAPERED BORE BEARING 1:12.
K30TAPERED BORE BEARING 1:30.
KHKEYSTONE 89H.
KYDUPONT, KRYTOX 240AC.
LULUBRIKO M24.
MMACHINED BRONZE RETAINER.
MMEDIUM FIT, AFBMA CLASS 0.
MTMOBIL-TEMP £1 SOCONY VACUUM.
NSNAP RING GROOVE IN OUTER RING.
NFNON-FLUID OIL CP. F924.
NGNON-FLUID OIL CO. G-60.
NRNOX – RUST 509.
NRSNAP RING IN OUTER RING.
NSNON-FLUID OIL CO. S-59.
NWNON-FLUID OIL CO. W-56.
OS2WATER PUMP BEARING, SHAFT 0.002 INCH OVERSIZE.
OS3WATER PUMP BEARING, SHAFT 0.003 INCH OVERSIZE.
PEPETROLATUM
RRO.D. RIDING TRASH GUARD RUBBER CONTACT SEALS.
RSFACE RIDING RUBBER CONTACT SALES.
RYRYKON 12.
SASHELL ALVANIA $2
SBSHELL XSG6409.
SCSHELL CYPRINA £3.
SDSHELL DARINA J2.
SESHELL DARINA EP.
SFSHELL DARINA FL.
SGSTANDARD GREASE CODE.
SLSHELL ALVANIA 13.
SOSTANOIL 15.
SPSHELL ALVANIA $2 EP.
SWSOUTHWEST GREASE AND OIL CO., CODE 5682.
SXSHELL DARINA AX.
TFACE RIDING TRASH GUARD RUBBER CONTACT SEAL.
TTIGHT FIT, AFBMA CLASS 2.
TBTEXACO PREMIUM BRB.
TCTEXAS CAPELLA B.
TETEXAS EP 2324 HI-TEMP.
THTEXAS 1999 HI-TEMP.
TLASHLAND OIL TECTYL 900.
TMTEMPLUBE 124.
TRTEXAS REGAL STARFAK AFB-2 .
TTTWO FACE RIDING TRASH GUARD RUBBER CONTACT SEALS.
TUTEXAS 1996 UNI-TEMP 500.
TXTEXAS 1692.
UCSUPERMIL GREASE NO. 31052.
UFASU 40.
UNUNOBA JL UNION OIL.
USASU 06752 (AMERICAN OIL) .
UTASU 100.
VLABYRINTH RUBBER SEAL .
VACHEVRON BRB2
VSCHEVRON SRI
WTWO LABYRINTH RUBBER SEALS.
WPRESSED STEEL RETAINER, ONE PIECE TYPE.
WNWINDSOR L245X
XREDESIGNED BOUNDARY DIMENSION OF LESS THAN + 1 MM.
XLEXTRA LOOSE FIT, AFBMA CLASS 3.
XTEXTRA TIGHT FIT, LESS THAN AFBMA CLASS 2.
YPRESSED BRASS RETAINER, TWO PIECE, RIBBON TYPE.
ZSINGLE SHIELD.
ZZGREASE SPE CIS PART OF ES NUMBER.
ZZTWO SHIELDS.
Complete list of NSK bearing suffixes

NSK prefixes and bearing part number system

Prefixes are used relatively rarely. They serve almost exclusively to indicate individual components of complete bearings or to designate miniature bearings.

NSK bearings prefixes.

The following table shows the complete list of prefixes used by NSK bearings.

PrefixDefinition
7SINGLE SHIELD.
77TWO SHIELDS.
8FELT SEAL.
87ONE FELT SEAL, ONE SHIELD.
88TWO FELT SEALS.
89ONE FELT SEAL, ONE TEFLON SEAL.
9TEFLON SEALS.
99TWO TEFLON SEALS.
HHEAVY SERIES CUP OR CONE, TAPERED ROLLER BEARINGS.
HHEXTRA HEAVY SERIES CUP OR CONE, TAPERED ROLLER BEARINGS.
HMMEDIUM-HEAVY SERIES CUP OR, CONE , TAPERED ROLLER BEARINGS.
LLIGHT SERIES CUP OR CONE, TAPERED ROLLER BEARINGS.
LLEXTRA LIGHT SERIES CUP OR CONE, TAPERED ROLLER BEARINGS.
LMMEDIUM-LIGHT SERIES CUP OR CONE, TAPERED ROLLER BEARINGS.
MMAX-TYPE, FILLING SLOT BALL BEARINGS.
MMEDIUM SERIES CUP OR CONE, TAPERED ROLLER BEARINGS.
MSSHIELD AND LOADING SLOT ON SAME SIDE, BALL BEARINGS.
NCYLINDRICAL BEARING, DOUBLE FLANGED INNER, OPEN OUTER.
NFCYLINDRICAL BEARING, DOUBLE FLANGED INNER, SINGLE FLANGED OUTER.
NHCYLINDRICAL BEARING, TWO-PIECE INNER, DOUBLE FLANGED OUTER.
NJCYLINDRICAL BEARING, SINGLE, FLANGED INNER, DOUBLE FLANGED OUTER.
NNCYLINDRICAL BEARING, DOUBLE-ROW, FLANGED INNER, OPEN OUTER.
NUCYLINDRICAL BEARING, OPEN INNER, DOUBLE FLANGED OUTER.
RINCH DIMENSION SERIES BALL BEARINGS.
RAPOWER TRANSMISSION BALL BEARINGS, PRELUBRICATED.
RAGPOWER TRANSMISSION BALL BEARINGS, RELUBRICATEABLE.
SCARTRIDGE BEARING SERIES.
SBPOWER TRANSMISSION BEARING, WIDE INNER, PRELUBRICATED.
SBGPOWER TRANSMISSION BEARING, WIDE INNER, RELUBRICATEABLE.
SEECCENTRIC LOCKING COLLAR FOR POWER TRANSMISSION.
SFFOUR-BOLT FLANGE UNIT, STANDARD, RELUBRICATEABLE.
SFCFOUR-BOLT FLANGE UNIT, RA UNIT, PRELUBRICATED.
SFTTWO-BOLT FLANGE UNIT, STANDARD, RELUBRICATEABLE.
SFTCTWO-BOLT FLANGE UNIT, RA UNIT, PRELUBRICATED.
SPSTANDARD HEIGHT PILLOW BLOCK, RELUBRICATEABLE.
SPCSTANDARD HEIGHT PILLOW BLOCK, RA UNIT, PRELUBRICATED.
SPECREVISED HEIGHT PILLOW BLOCK, RA UNIT, PRELUBRICATED.
SPHREVISED HEIGHT PILLOW BLOCK, RELUBRICATEABLE.
STUTAKE-UP UNIT BLOCK, RELUBRICATEABLE.
STUCTAKE-UP UNIT BLOCK, RA UNIT, PRELUBRICATED.
WCFELT SEAL SERIES BEARINGS, WIDE OUTER RING.
XSPECIAL BEARING SERIES.
The complete list of NSK bearing prefixes

Featured Video: NSK bearing manufacturing plant in Europe.

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