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Prefix & Suffix Interchange Reference Guide

Regarding bearing selection and replacement, it is crucial to understand the representation of prefixes and suffixes of different bearing manufacturers. This guide will provide a picture of the prefixes and suffixes of several common bearing manufacturers in the market to help you; for more technical support, please get in touch with our engineers via email.

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Prefix & Suffix Interchange

Prefix & Suffix Interchange

CHARACTERISTICSTFLNTNSKFFAGTIMKENNSKNTN
CLOSURES   One Non-Contact SealRZLBRZRZRZVLB
   Two Non-Contact Seals2RZLLB2RZ2RZ2RZVVLLB
   One Contact SealRS1LURS1ELSRSDULU
   Two Contact Seals2RS1LLU2RS12ELS2RSDDULLU
   One ShieldZZZZZZZ
   Two Shields2ZZZ2Z2ZZZZZZZ
   One Snap RingNRNRNRNRNRNRNR
PRECISION CLASSES   ABEC 3P6P6P6P6M*P6, PA3P6
   ABEC 5P5P5P5P5V*P5, PA5P5
   ABEC 7P4P4P4P4SMM, MMVP4, PA7P4
   ABEC 9PA9AP2PA9AP2MMX*P2, PA7P2
CONTACT ANGLES   15°CCCC2*CC
   25°AC, ACDHAC, ACDE3*A5H
   30°A-AN/AN/AA-
   40°BBBB-BB
PRELOAD   Extra Light-GL--UXELGL
   LightGAGN, J74GALULL, C7GN, J74
   MediumGBGM, J84GBMUMM, C8GM, J84
   HeavyGCGH, J94GCHUHH, C9GH, J94
CAGE   PhenolicTPT1TPTA, TB, TH, TPCRTT1
   Pressed BrassYYYMPNO SYMYY
   Polyamide/NylonTN, P, TN9T2TN, P, TN9TN, T, TVPRB/PRC, CFTYT2
   BrassM, MA, MBL1M, MA, MBM, MPMBRCAM, ML1
   Pressed SteelJJJJC, CDWJ
DUPLEX   Universal GroundG**G, UG**USUSUG, U
SPHERICAL FEATURES   Taper BoreKKKKKKK
   Oil GrooveW33W33, D1W33SW33E4W33, D1
   Shaker ScreensCACM2/W502UAVS, EF800, EMADIVSCACM2/W502F80W800VS3(4)UAVS, EF800,
EMADIVS

* Prefix  / ** Old Nomenclature; New = CA, CB, CC, GA, GB, GC

References: ntnamericas.com

1、Why is it important to understand bearing prefixes and suffixes?

Bearing suffixes and prefixes are used to indicate specific features of a bearing, such as its type, size and material. Understanding these terms can help you select the right bearing for your application and understand the functions of different bearings.

2、What is an ABEC rating, and what do the different levels mean?

ABEC, an acronym for Annular Bearing Engineers Committee, is an American Bearing Manufacturers Association division. The ABEC system is the Precision Perrin Standard. The standard specifies ball size and running tolerances (bearings under the ABEC system are numbered 1, 3, 5, 7, and 9; the higher the number, the higher the precision, the faster the speed, and the more expensive the bearing). However, it is worth noting that a higher ABEC rating only sometimes means a better bearing, as most applications do not require a higher precision level than ABEC1. Often, ABEC1 bearings have no suffix at all.

3、What do the bearing suffix letters mean?

The rear code of the bearing uses letters and numbers to indicate the structure of the bearing, tolerances, special requirements of the material, and so on. The content of the rear code is a lot; the following are a few commonly used codes.

(1) the internal structure code is expressed in the same type of bearing of different internal structures, with letters immediately after the basic code. For example, the contact angle of 15 °, 25 ° and 40 ° angular contact ball bearings with C, AC and B, respectively, the internal structure of the different.

(2) bearing tolerance level is divided into 2 levels, 4 levels, 5 levels, 6 levels, 6X level and 0 levels, a total of 6 levels, in order from the high level to the low level, the code was / PZ, / P4 '/ PS, / P6, / P6X and / PO. The tolerance level, 6X level, only applies to tapered roller bearings; 0 levels for the ordinary level, in the wheel bearing code, is not marked out.

(3) The commonly used bearing radial clearance series is divided into 1 group, 2 groups, 0 groups, 3 groups, 4 groups and 5 groups, a total of 6 groups, with radial clearance from small to large. o group clearance is commonly used. Clearance groups in the bearing code are not marked; the rest of the clearance groups in the bearing code are with / CI, / CZ, / C3, / C4, and / CS, respectively.

4、What is the role of a cage in a bearing, and what do the different cage suffixes indicate?

Cages (also known as rolling element retainers) can play various roles in the normal operation of rolling bearings. The cage separates the rolling elements and avoids contact and wear between the rolling elements. The cage aligns the rolling elements on the raceways of the inner ring, preventing them from slipping, sliding or tilting and ensuring pure rolling. From the mounting point of view, the cage keeps the rolling elements on the inner ring to facilitate bearing mounting. In some cases, the cage can also improve the lubrication of the bearing raceways or the contact surfaces of the flanges.

Common cage suffixes include "J" for steel cage, "M" for machined brass cage, and "TN" for polyamide cage. These suffixes are more common in roller bearings than in ball bearings.