Shaft and housing tolerance classes for drawn cup and alignment needle roller bearings
| Housing material1) | Tolerance classes2) | ||
| Housing bore seat3) | Raceway on the shaft | Shaft inner ring seat | |
| Steel, cast iron | N6 | h5 | k5 |
| Light alloy | R6 | h5 | k5 |
- 1) For housings that are not rigid, determine the shaft tolerance by trial and error.
- 2) Envelope requirement (symbol Ⓔ from ISO 14405-1) applicable for all tolerance classes, e.g. N6Ⓔ.
- 3) The geometrical tolerance in accordance with ISO 1101 for the housing bore of drawn cup needle roller bearings must correspond to IT5/2 tolerance grade.
