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NSK bearings radial clearance is not the smaller the better, not all require the smallest bearing clearance work, must be in accordance with the conditions to adopt the appropriate clearance. The national standard G 40 - B6493, the radial clearance of the bearing is divided into 5, rolling group swim sequentially gap value, 0 in the standard clearance. Its basic radial clearance group suitable for general operating conditions, the conventional temperature and commonly used fit: high temperature, high speed, in the high and low in the face of mounting surface or back-to-back, decide the internal clearance or preload on the axial position of one of the bearing rings.
Clearance and preload selection depends on the bearing configuration operation status and performance requirements. Axial bearing NSK swim there is a fixed relationship between the gap and radial clearance, as long as one value, often is the axial clearance will pass enough. Starting from the zero gap condition, after loosening or tightening shaft back mother or adjust the bearing outer ring gasket on the clearance adjustable bearing, installation and use in the process should be adjusted. Through adjustment in the use process, part wear bearing clearance caused by the compensation of bearings increased. Clearance adjustable bearing, such as tapered roller bearings, both the radial clearance and axial clearance, but also has a certain geometric relationships between them. The thrust bearing, has the practical significance only axial clearance. Bearing noise, low friction and other special conditions are advised to choose a larger radial clearance; of precision spindle bearings should be selected smaller radial play; for NSK bearing thickness, can obtain the specified clearance.
| Product Model | Inside Diameter | Outside Diameter | Thickness |
| 7230ADF NSK | 150 | 270 | 45 |
| 7030ADF NSK | 150 | 225 | 35 |