Fit
The fitting between the Spherical Plain Bearing and the shaft or the housing is selected according to the conditions. Table1 shows recommended values.
Table1 Recommended Fitting Values
| Service condition | Shaft | Housing | |
|---|---|---|---|
| Inner ring rotational load |
Normal load | k6 | H7 |
| Indeterminate load | m6 | H7 | |
| Outer ring rotational load |
Normal load | g6 | M7 |
| Indeterminate load | h6 | N7 | |
- Note1) If the product is to be installed so that the inner ring rotates and the fitting with the shaft is to be clearance fitting, harden the surface of the shaft in advance.
- Note2) "N7" is recommended for light alloy housings.
Shaft Designing
If the inner ring is to be fit onto the shaft in loose fitting and the product is to be used under a heavy load, the shaft may slip on the inner circumference of the inner ring. To prevent the slippage, the shaft hardness must be 58 HRC or higher and the surface roughness must be Ra0.80 or below.
