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 and hexagonal recess on both ends of the stud.
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
KR design with a cylindrical (flat) profile of the outer ring running surface and a hexagonal recess on both ends of the stud.
XB
NUKR design with a cylindrical (flat) profile of the outer ring running surface and a hexagonal recess on both ends of the stud.


Suffixes - Cage design (n.a.)
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