Shaft tolerance classes for needle roller bearings with machined inner and outer rings on solid stee
| Conditions | Shaft
diameter |
Dimensional
tolerance1) |
Total radial
run-out tolerance2) |
Ra
|
| – | mm | – | – | µm
|
| Rotating inner ring load or direction of load indeterminate | ||||
| Light and variable loads | ≤ 10 | k5 | IT5/2
|
0,4 |
| (P ≤ 0,05 C) | > 10 to 25 | k6 | IT5/2 | 0,8 |
| > 25 to 100 | m6 | IT5/2 | 0,8 | |
| Normal to heavy loads | ≤ 25 | k5 | IT5/2 | 0,4 |
| (0,05 C < P ≤ 0,1 C) | > 25 to 60 | m6 | IT5/2 | 0,8 |
| > 60 to 100 | n6 | IT5/2 | 0,8 | |
| > 100 to 400 | p63) | IT5/2 | 1,6
|
|
| Heavy to very heavy loads | > 50 to 100 | n63) | IT5/2 | 0,8
|
| (P > 0,1 C) | > 100 to 200 | p63) | IT5/2 | 1,6
|
| > 200 | r63) | IT5/2 | 1,6
|
|
| Stationary inner ring load | ||||
| Easy axial displacement of
the inner ring on the shaft desirable |
g6 | IT5/2 | 1,6
|
|
| Easy axial displacement of
the inner ring on the shaft unnecessary |
h6 | IT5/2 | 1,6
|
|
- 1) Envelope requirement (symbol Ⓔ from ISO 14405-1) applicable for all tolerance classes, e.g. k5Ⓔ.
- 2) Values listed are for bearings to Normal tolerances.
- 3) Bearings with radial internal clearance greater than Normal may be necessary.
