Cookies on the SKF website

We use cookies to ensure that we give you the best experience on our websites and web applications. By continuing without changing your browser settings, we assume you give your consent to receive cookies. However, you can change your browser cookie setting at any time.

Designation system

The designations of SKF super-precision bearings follow a system that consists of a basic designation with or without one or more prefixes and/or suffixes.
An example and the applicable options for axial-radial cylindrical roller bearings are given below.
Basic bearing designation system


NRT 260 A/GwhereNRT 260 =
A =
G =

Applicable options for axial-radial cylindrical roller bearings

Test Designation 1
Prefixes (n.a.)

Test Designation 2
Basic designation
NRTAxial-radial cylindrical roller bearing
Bore diameter [mm]

Catalogue image - Test Designation 3
Suffixes - Internal design
ABasic internal design
BModified internal design

Test Designation 4
Suffixes - External design (seals, snap ring groove etc.) (n.a.)

Catalogue image - Test Designation 5
Suffixes - Cage design (n.a.)

Catalogue image - Test Designation 6.1
Suffixes - Materials, heat treatment (n.a.)

Test Designation 6.2
Suffixes - Accuracy, clearance, preload, quiet running (n.a.)

Test Designation 6.4
Suffixes - Stabilization (n.a.)

Suffixes - Lubrication
GBearing greased at the factory

Test Designation 6.6
Suffixes - Other features (n.a.)
SKF logo