Tolerances for cast iron and steel housings - seats for thrust bearings1)
| Conditions |
Dimensional
tolerance2) |
Total axial
run-out tolerance |
Ra | Remarks |
| – | – | µm | – | |
| Axial loads only | ||||
| Thrust ball bearings | H8 | IT7 | 6,3 | For less precise bearing arrangements, there can be a
radial clearance of up to 0,001 D. |
| Spherical roller thrust bearings where
separate bearings provide radial location |
– | IT6 | Housing washer must be fitted with an adequate radial gap
so that no radial load can act on the thrust bearings. |
|
| Combined radial and axial loads on spherical roller thrust bearings | ||||
| Stationary load on housing washer
arrangements |
H7 | IT6 | 3,23) | For additional information, refer to Design considerations. |
| Rotating load on housing washer | M7 | IT6 | 3,23) | |
-
1)
For cylindrical roller thrust bearings → Design considerations
For needle roller thrust bearings → Design considerations - 2) All ISO tolerance classes are valid with the envelope requirement (such as H7Ⓔ) in accordance with ISO 14405-1.
- 3) For D < 80 mm, use Ra = 1,6 µm.
