The radial internal clearance symbols for TIMKEN miniature and extra-small deep groove ball bearings are as follows:
- MC1 – Extra tight
- MC2 – Tight
- MC3 – Normal or regular
- MC4 – Loose
- MC5 – Extra loose
- MC6 – Extra-extra loose
The table below provedes the selection of radial internal clearance for TIMKEN miniature and extra-small deep groove ball bearings.
| MC1 | MC2 | MC3 | MC4 | MC5 | MC6 | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| um | um | um | um | um | um | ||||||
| Min. | Max. | Min. | Max. | Min. | Max. | Min. | Max. | Min. | Max. | Min. | Max. |
| 0 | 5 | 3 | 8 | 5 | 10 | 8 | 13 | 13 | 20 | 20 | 28 |
Note: Standard TIMKEN miniature and extra-small deep groove ball bearings with no clearance designation in the part number are made with the MC3 normal clearance.
