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Bearing Designation Information

The designations of our Bearings follow a system that may consist of a straightforward designation with or without one or more prefixes and/or suffixes, as shown below.

Prefixes and suffixes provide additional information about the bearing.

Prefixes are primarily used to identify components of a bearing or identify bearing variants.

Suffixes identify variants or designs, which differ in some way from the original design or from the current basic design. The suffixes are divided into groups. When more than one special feature is to be identified.

S/S = Stainless Steel Bearing

Suffix 2Z, 2ZR, ZZ

Bearing with two metal shields.

Suffix NR

Bearing with snap ring groove & snap ring.

Suffix Z, ZR

Bearing with one metal shield.

Suffix RS, RSR

Bearing with one rubber seal.

Suffix 2RS, 2RS1, 2RSR

Bearing with two rubber seals.

Suffix 2ZNR

Bearing with two metal shields with snap ring groove & snap ring.

Suffix 2RSNR

Bearing with two rubber seals with snap ring groove & snap ring.

Suffix C3

Indicates that a bearing has a Radial internal clearance greater than normal (to allow for heat expansion). 

Bearing Clearance

Bearing internal clearance is defined as the entire distance through which one bearing ring can be moved relative to the other in the radial direction (radial internal clearance).