Diameter tolerances for bearing seats in cast iron and steel housings
| Bearing type | Conditions | Housing bore | Tolerance class1) | Deviations | ||||
| Bearings to tolerance class | ||||||||
| over | incl. | P4, P4A, P4C, SP | P2, PA9A, UP | high | low | |||
| – | – | mm | – | µm | ||||
| Angular contact ball bearings | Locating bearings, axial
displacement of outer ring unnecessary |
– | 18 | – | – | +4 | –1 | |
| 18 | 30 | – | – | +5 | –1 | |||
| 30 | 50 | – | – | +6 | –1 | |||
| 50 | 80 | – | – | +7 | –1 | |||
| 80 | 120 | – | – | +7 | –3 | |||
| 120 | 180 | – | – | +9 | –3 | |||
| 180 | 250 | – | – | +10 | –4 | |||
| 250 | 315 | – | – | +12 | –4 | |||
| 315 | 400 | – | – | +13 | –5 | |||
| 400 | 500 | – | – | +14 | –6 | |||
| Non-locating bearings,
axial displacement of outer ring desirable |
– | 18 | – | – | +7 | +2 | ||
| 18 | 30 | – | – | +8 | +2 | |||
| 30 | 50 | – | – | +9 | +2 | |||
| 50 | 80 | – | – | +10 | +2 | |||
| 80 | 120 | – | – | +13 | +3 | |||
| 120 | 180 | – | – | +16 | +4 | |||
| 180 | 250 | – | – | +19 | +5 | |||
| 250 | 315 | – | – | +21 | +5 | |||
| 315 | 400 | – | – | +24 | +6 | |||
| 400 | 500 | – | – | +27 | +7 | |||
| Rotating outer ring load | – | 500 | M5 | M4 | – | – | ||
| Cylindrical roller bearings | Light to normal loads (P ≤ 0,1 C) | – | 900 | K5 | K4 | – | – | |
| Heavy loads (0,1 C < P ≤ 0,15 C), rotating outer ring loads | – | 900 | M5 | M4 | – | – | ||
| Double direction angular contact thrust ball bearings | ||||||||
| – | 315 | K5 | K4 | – | – | |||
- 1) All ISO tolerance classes are valid with the envelope requirement (such as M4Ⓔ) in accordance with ISO 14405-1:2010.
