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| Bearing model | Boundary Dimensions（mm） | Speed Rating(ipm) | Load Rating （kn） | Bearing type | ||||
|---|---|---|---|---|---|---|---|---|
| d | D | B | Grease lubrication | Oil lubrication | Dynamic Cr | Static Cor | ||
| W 63801 | 12 | 21 | 7 | 1.51 | 0.9 | 70000 | 43000 | Deep groove ball bearing |
| W 63800-2Z | 10 | 19 | 7 | 1.48 | 0.83 | 80000 | 38000 | Deep groove ball bearing |
| W 63800-2RZ | 10 | 19 | 7 | 1.48 | 0.83 | 80000 | 38000 | Deep groove ball bearing |
| W 63800-2RS1 | 10 | 19 | 7 | 1.48 | 0.83 | 22000 | Deep groove ball bearing | |
| W 63800 R-2Z | 10 | 19 | 7 | 1.48 | 0.83 | 80000 | 38000 | Deep groove ball bearing |
| W 63800 R-2RS1 | 10 | 19 | 7 | 1.48 | 0.83 | 22000 | Deep groove ball bearing | |
| W 63800 R | 10 | 19 | 7 | 1.48 | 0.83 | 80000 | 48000 | Deep groove ball bearing |
| W 63800 | 10 | 19 | 7 | 1.48 | 0.83 | 80000 | 48000 | Deep groove ball bearing |
| W 638/9-2Z | 9 | 17 | 6 | 0.761 | 0.335 | 85000 | 43000 | Deep groove ball bearing |
| W 638/8-2Z | 8 | 16 | 6 | 0.715 | 0.3 | 90000 | 45000 | Deep groove ball bearing |
| W 638/8 R-2Z | 8 | 16 | 6 | 0.715 | 0.3 | 90000 | 45000 | Deep groove ball bearing |
| W 638/5-2Z | 5 | 11 | 5 | 0.403 | 0.143 | 120000 | 60000 | Deep groove ball bearing |
| W 638/5-2RZ | 5 | 11 | 5 | 0.403 | 0.143 | 120000 | 60000 | Deep groove ball bearing |
| W 638/5-2RS1 | 5 | 11 | 5 | 0.403 | 0.143 | 34000 | Deep groove ball bearing | |
| W 638/5 R-2Z | 5 | 11 | 5 | 0.403 | 0.143 | 120000 | 60000 | Deep groove ball bearing |
| W 638/5 R-2RS1 | 5 | 11 | 5 | 0.403 | 0.143 | 34000 | Deep groove ball bearing | |
| W 638/4-2Z | 4 | 9 | 4 | 0.364 | 0.114 | 140000 | 70000 | Deep groove ball bearing |
| W 638/4-2RZ | 4 | 9 | 4 | 0.364 | 0.114 | 140000 | 70000 | Deep groove ball bearing |
| W 638/4-2RS1 | 4 | 9 | 4 | 0.364 | 0.114 | 40000 | Deep groove ball bearing | |
| W 638/4 XR-2Z | 4 | 10 | 4 | 0.553 | 0.245 | 130000 | 63000 | Deep groove ball bearing |
| W 638/4 XR-2RS1 | 4 | 10 | 4 | 0.553 | 0.245 | 36000 | Deep groove ball bearing | |
| W 638/4 X-2Z | 4 | 10 | 4 | 0.553 | 0.245 | 130000 | 63000 | Deep groove ball bearing |
| W 638/4 X-2RZ | 4 | 10 | 4 | 0.553 | 0.245 | 130000 | 63000 | Deep groove ball bearing |
| W 638/4 X-2RS1 | 4 | 10 | 4 | 0.553 | 0.245 | 36000 | Deep groove ball bearing | |
| W 638/4 R-2Z | 4 | 9 | 4 | 0.364 | 0.114 | 140000 | 70000 | Deep groove ball bearing |
| W 638/4 R-2RS1 | 4 | 9 | 4 | 0.364 | 0.114 | 40000 | Deep groove ball bearing | |
| W 638/3-2Z | 3 | 7 | 3 | 0.178 | 0.057 | 160000 | 80000 | Deep groove ball bearing |
| W 638/3-2RS1 | 3 | 7 | 3 | 0.178 | 0.057 | 45000 | Deep groove ball bearing | |
| W 638/3 R-2Z | 3 | 7 | 3 | 0.178 | 0.057 | 160000 | 80000 | Deep groove ball bearing |
| W 638/3 R-2RS1 | 3 | 7 | 3 | 0.178 | 0.057 | 45000 | Deep groove ball bearing | |
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