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Bearing speed mainly by friction within the bearing temperature rise caused by heat limitation, when the speed exceeds a certain threshold value, the bearing may occur due to the sintering temperature increases, which can not be used.
Bearing speed limit is bearing certain operating conditions, to achieve heat equilibrium can withstand temperatures into the speed limit. Bearing speed limit contact with the bearing angle, tolerance level, work status, lubrication, the group with type, pre-load, and material type and other factors.
1, the contact angle
25 ° contact angle of the bearing, the speed limit is about 15 ° contact angle with the bearing structure 90%.
2, the tolerance level
High-speed machine tool spindle bearings tolerance class P4 generally, if the accuracy of the speed limit is lower bearing, P4A and P2 precision bearings under the speed limit is about 1.1, P5 grade bearings is approximately 0.9.
3, work status
High-speed spindle bearings generally rotating inner ring, outer ring fixed, if this time bearing speed limit is, when the outer ring rotates, the inner ring is fixed, bearing speed limit is about 0.6.
4, lubrication
Lubrication of different ways, on the bearing speed limit have a greater impact, Table 2 for different lubrication conditions bearing speed limit factor.
| Product Model | Inside Diameter | Outside Diameter | Thickness |
| 7928A5DB NSK | 140 | 190 | 24 |
| 7924CDB NSK | 120 | 165 | 22 |