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.
Basic bearing designation system
PWKRE 47.2RS
wherePWKRE 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
PWKRECam 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.)
.2RSNBR 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.)
SKF logo