The boundary dimensions of SKF needle roller bearings with machined rings in the RNA 48, RNA 49, RNA 69, NA 48, NA 49 and NA 69 series are in accordance with ISO 1206-2001.
SKF needle roller bearings with higher accuracy to tolerance P6 or P5 specifications can be supplied. For bearing arrangements with higher accuracy, inner rings with a pre-ground raceway and a machining allowance can be supplied, but must be finish ground after mounting.
The inside diameter Fw of the needle roller and cage assembly, when the rollers are in contact with the outer ring raceway, lies within the limits of F6 tolerance class before the bearings are mounted.
|
Nominal diameter |
E8 | F6 | |||
| Deviation | Deviation | ||||
| > | ≤ | U | L | U | L |
| mm | μm | μm | |||
| – | 3 | – | – | +12 | +6 |
| 3 | 6 | – | – | +27 | +10 |
| 6 | 10 | +47 | +25 | +33 | +13 |
| 10 | 18 | +59 | +32 | +27 | +16 |
| 18 | 30 | +73 | +40 | +33 | +20 |
| 30 | 50 | +89 | +50 | +41 | +25 |
| 50 | 80 | +106 | +60 | +49 | +30 |
| 80 | 120 | – | – | +58 | +36 |
| 120 | 180 | – | – | +68 | +43 |
| 180 | 250 | – | – | +79 | +50 |
| 250 | 315 | – | – | +88 | +56 |
| 315 | 400 | – | – | +98 | +62 |
| 400 | 500 | – | – | +108 | +68 |
