Both NSK ball ball type and ball roller type of water pump bearings have the same dimensional tolerances as outlined below.
| Types of bearings |
Tolerance of outside diameter of out ring D |
Tolerance of width of outer ring W |
Tolerance of diameter of main shaft A |
Tolerance of diameter of front shaft A1 |
Tolerance of diameter of rear shaft B |
Tolerance of shaft length L1 |
Tolerance of front shaft length L4 |
Tolerance of rear shaft length L3 |
Tolerance of assembled width L2 |
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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| High | Low | High | Low | High | Low | High | Low | High | Low | High | Low | High | Low | High | Low | High | Low | ||
| RWF | All dimensions | 0 | -13 | +150 | -150 | 0 | -13 | 0 | -13 | 0 | -13 | +250 | -250 | +250 | -250 | +250 | -250 | +150 | -150 |
| BWF | |||||||||||||||||||
Standard chamfer designs and dimensions of NSK water pump bearings are as follows:
Shaft chamfer
Outer ring chamfer
