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 cam followers are given below.
| PWKRE 47.2RS
| where | PWKRE 47 = |  |
| .2RS = |  |
 | Prefixes (n.a.) |
|
| Basic designation |
| KR
| Cam follower fitted with a needle roller and cage assembly.
|
| KRE
| Cam follower fitted with a needle roller and cage assembly, with an eccentric collar pressed onto the stud.
|
| KRV
| Cam follower fitted with a full complement of needle rollers.
|
| KRVE
| Cam follower fitted with a full complement of needle rollers, with an eccentric collar pressed onto the stud.
|
| NUKR
| Cam follower based on a double row full complement cylindrical roller bearing with two integral outer ring flanges.
|
| NUKRE
| Cam follower based on a double row full complement cylindrical roller bearing with two integral outer ring flanges, with an eccentric collar pressed onto the stud.
|
| PWKR
| Cam follower based on a double row full complement cylindrical roller bearing with three integral outer ring flanges.
|
| PWKRE | Cam follower based on a double row full complement cylindrical roller bearing with three integral outer ring flanges, with an eccentric collar pressed onto the stud.
|
| Suffixes - Internal design (n.a.) |
| Suffixes - External design (seals, snap ring groove, etc.)
|
| .2RS | NBR contact seal on both sides
|
| A
| Improved crowned profile of the outer ring running surface (NUKR design). |
| B
| Hexagonal recess on both ends of the stud.
|
| PPA
| KR design with a PA66 axial sliding and sealing ring on both sides. Improved crowned profile of the outer ring running surface. Sizes 16 and 19 have one slot in the head of the stud as standard. Sizes ≥ 22 have a hexagonal recess on both ends.
|
| PPSKA
| KR design, sizes 16 and 19, with a PA66 axial sliding and sealing ring on both sides, improved crowned profile of the outer ring running surface and a hexagonal recess in the head of the stud, no relubrication features.
|
| PPXA
| PPA features except for the outer ring running surface, which has a cylindrical profile. |
| X
| Cylindrical (flat) profile of the outer ring running surface.
|
| XA
| Cylindrical (flat) profile of the outer ring running surface (NUKR .. A or NUKRE .. A design). |
| XB
| Cylindrical (flat) profile of the outer ring running surface and a hexagonal recess on both ends of the stud (NUKR design).
|
| Suffixes - Cage design (n.a.) |
