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Clearance is an important factor to the adapter sleeve, it concerns the bearings can normal work or not. Choosing appropriate adapter sleeve clearance, can make the load in the rolling element between reasonable distribution; Can limit shaft (or shell) of the axial and radial displacement are in place to ensure that the axis of rotation accuracy; Make adapter sleeve in the required temperature can work normally; Can reduce adapter sleeve work vibration and noise, etc.
In choosing adapter sleeve clearance, besides should consider adapter sleeve working conditions (such as load, speed, temperature, etc.) and the adapter set of performance requirements (such as friction moment, vibration and noise, rotating accuracy, etc.), but also should be taken into consideration:
1. The adapter sleeve and shaft and the shell of the interference fit cause clearance decreased.
2. Adapter sleeve work, internal and external ring to reduce the difference in temperature between clearance;
3. The shaft and housing manufacturing materials for expansion coefficient of different lead to clearance reduce or increase.
Thus it can be seen, adapter sleeve clearance to adapter set of life, temperature rise, vibration and noise has a great influence.
| Product Model | Inside Diameter | Outside Diameter | Thickness |
| 7001ADF NSK | 12 | 28 | 8 |
| 7901CDF NSK | 12 | 24 | 6 |