Cookies on the SKF website

SKF uses cookies on our websites to align the information shown as closely as possible to our visitors’ preferences, such as country and language choices.

Will you accept SKF cookies?

Designation system

The designations of most SKF rolling bearings follow a system that may consist of a basic designation with or without one or more prefixes and/or suffixes (→ Basic bearing designation system).
An example and the applicable options for alignment needle roller bearings are given below.
Basic bearing designation system

Example

RPNA 15/28
whereR =
PNA 15/28 =
Test Designation 1
  Prefixes
R
Bearing without an inner ring

Test Designation 2
Basic designation (table 1)
PNA
Alignment needle roller bearing

Catalogue image - Test Designation 3
Suffixes - Internal design (n.a.)

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 6.2Suffixes - Accuracy, clearance, preload, quiet running
C2Radial internal clearance smaller than Normal
C3Radial internal clearance greater than Normal
C4Radial internal clearance greater than C3

Catalogue image - Test Designation 6.3
Suffixes - Bearing sets, matched bearings (n.a.)

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


Suffixes - Lubrication (n.a.)

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