SKF support rollers designation

The designation for SKF support rollers do not fully follow the basic SKF bearing designation. SKF support rollers designation are given below:

1 Prefixes (n.a.)

2 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. 

3 Suffixes - Internal design (n.a.)

4 Suffixes - External design (seals, snap ring groove, etc.)
.2RS NBR 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. 

5 Suffixes - Cage design
TN Glass fibre reinforced PA66 cage 

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