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It is usually unnecessary to axially locate a shaft by more than one bearing as temperature variations may have a different effect on the length of the shaft than on the distance between the housing, resulting in damage to the bearings.
The bearing that locates the shaft is called the fixed bearing. The other bearing is free to float on either the shaft or housing seat. For shorter spans variations in shaft length, due to temperature, are usually negligible and such situations may be dealt with differently as proper adjustment of the bearings are necessary.
To mount a free bearing, it must be ensured that there is sufficient axial clearance at the side where the bearing is expected to move. The bearing is usually centered on the seating. In case the induction heater is used, no residual magnetism must remains in the inner ring
Axial Adjustment, it is important to ensure proper seating of the rolling elements so as not to introduce an error in the final adjustment. Rotating the shaft during adjustment simultaneously pushing and pulling it insures proper seating of the rolling elements.
| Product Model | Inside Diameter | Outside Diameter | Thickness |
| 7901A5DT NSK | 12 | 24 | 6 |
| 7300BDT NSK | 10 | 35 | 11 |