The 63 series metric miniature ball bearing is a high-precision, miniaturized rolling bearing that is widely used in precision machinery, micromotors, home appliances, office equipment and other light-load, high-speed scenarios. It is characterized by compact size, light weight, low friction coefficient, ability to withstand certain radial and axial loads, smooth operation and low noise. Bearings are typically made from high-quality steel or stainless steel and undergo special heat treatments to improve durability and corrosion resistance. 63 series metric miniature ball bearings are often used in small equipment that require long life and high efficiency operation. They are important components in micromechanical transmission.
Product parameters
| Designation | Principal dimensions（mm） | Basic load ratings(N) | Basic load ratings{kgf} | Speed ratings(rpm) | Abutment and fillet dimensions (mm) | Weight(g) | |||||||||||||||||
| With shiled | Open type | With seal VV | With seal DD | d | D | B | B1 | r(min) | Cr | Cor | Cr | Cor | Grease | Oil | da(min) | db(max) | Da(Max) | Db(min) | ra(max) | rb(max) | Open type | With shiled | |
| ZZ | D·D | Z | |||||||||||||||||||||
| 633 | 633ZZ | - | - | 3 | 13 | 5 | 5 | 0.2 | 1300 | 485 | 133 | 49 | 40000 | - | 48000 | 4.6 | 6 | 11.4 | 11.3 | 0.2 | 0.2 | 3.38 | 3.33 |
| 634 | 634ZZ1 | - | - | 4 | 16 | 5 | 5 | 0.3 | 1730 | 670 | 177 | 68 | 36000 | - | 43000 | 6 | 7.5 | 14 | 13.8 | 0.3 | 0.3 | 5.24 | 5.21 |
| 635 | 635ZZ1 | 635VV | 635DD | 5 | 19 | 6 | 6 | 0.3 | 2340 | 885 | 238 | 90 | 32000 | 30000 | 40000 | 7 | 8.5 | 17 | 16.5 | 0.3 | 0.3 | 8.56 | 8.34 |
| 636 | 636ZZ | 636VV | 636DD | 6 | 22 | 7 | 7 | 0.3 | 3300 | 1370 | 335 | 140 | 30000 | 28000 | 36000 | 8 | 10.5 | 20 | 19 | 0.3 | 0.3 | 14 | 14 |
| 637 | 637ZZ1 | 637VV | 637DD | 7 | 26 | 9 | 9 | 0.3 | 4550 | 1970 | 465 | 201 | 28000 | 22000 | 34000 | 9 | 12.8 | 24 | 22.8 | 0.3 | 0.3 | 24 | 25 |
| 638 | 638ZZ1 | 638VV | 638DD | 8 | 28 | 9 | 9 | 0.3 | 4550 | 1970 | 465 | 201 | 28000 | 22000 | 34000 | 10 | 12.8 | 26 | 22.8 | 0.3 | 0.3 | 28.3 | 28.6 |
| 639 | 639ZZ | 639VV | - | 9 | 30 | 10 | 10 | 0.6 | 5100 | 2390 | 520 | 244 | 24000 | - | 30000 | 13 | 16.1 | 26 | 25.6 | 0.6 | 0.6 | 36.5 | 36 |
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