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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 support rollers are given below.
Basic bearing designation system
NATR 5 PPA
whereNATR 5 =
PPA =

Prefixes
R
Support roller without an inner ring


Basic designation
NA 22
Support roller without a flange ring, fitted with a needle roller and cage assembly
STO
Support roller without a flange ring, fitted with a needle roller and cage assembly
NATR
Support roller with two pressed-on flange rings, fitted with a needle roller and cage assembly
NATV
Support roller with two pressed-on flange rings, fitted with a full complement of needle rollers
NUTR
Support roller based on a double row full complement cylindrical roller bearing with two integral outer ring flanges and a loose flange ring on both sides of the inner ring
NNTR
Support roller based on a double row full complement cylindrical roller bearing with three integral outer ring flanges and a loose flange ring on both sides of the inner ring
PWTR
Support roller based on a double row full complement cylindrical roller bearing with three integral outer ring flanges and a loose flange ring on both sides of the inner ring


Suffixes - Internal design (n.a.)


Suffixes - External design (seals, snap ring groove, etc.)
.2RSNBR contact seal on both sides
.2ZL
Lamellar seal on both sides
A
Improved crowned profile of the outer ring running surface (NUTR design)
PPA
PA66 axial sliding and sealing ring on both sides. Improved crowned profile of the outer ring running surface
PPXA
PA66 axial sliding and sealing ring on both sides. Cylindrical (flat) profile of the outer ring running surface
X
Cylindrical (flat) profile of the outer ring running surface


Suffixes - Cage design
TN
Glass fibre reinforced PA66 cage
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