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| Formulation of Bearing Numbers |
| Basic numbers |
Auxiliary symbols |
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| Bearing Series Symbols |
| Symbol |
Meaning |
| 68, 69, 60 |
Single-row deep groove ball bearings |
| 70, 72, 73 |
Single-row angular contact ball bearings |
| 12, 13, 22 |
Self-aligning ball bearings |
| NU 10, NJ 2, N 3, NN 30 |
Cylindrical roller bearings |
| NA48, NA49, NA69 |
Needle roller bearings |
| 320, 322, 323 |
Tapered roller bearings |
| 230, 222, 223 |
Spherical roller bearings |
| 511, 512, 513 |
Thrust ball bearing with flat seats |
| 292, 293, 294 |
Spherical thrust roller bearings |
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