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