The 68 series metric miniature deep groove ball bearings are a type of compact bearings mainly used in applications where space is limited but high precision and high speed are required. They have a single-row design with a small range of inner diameters, making them suitable for small machinery. Due to the use of high-quality materials and precision machining processes, 68 series bearings are able to provide low friction and high stability at high rotational speeds, with good durability and wear resistance. Common applications include micromotors, precision instruments, medical equipment, and office automation equipment. This series of bearings usually adopts open or sealed design to meet the lubrication and dust-proof requirements under different working conditions.
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 | |||||||||||||||||||||
| 681 | - | - | - | 1 | 3 | 1 | - | 0.05 | 80 | 23 | 8 | 2.5 | 130000 | - | 150000 | 1.4 | - | 2.6 | - | 0.05 | - | 0.03 | - |
| 681X | 681XZZ | - | - | 1.5 | 4 | 12 | 2 | 0.05 | 112 | 33 | 11 | 3.5 | 100000 | - | 120000 | 1.9 | 2.1 | 3.6 | 3.6 | 0.05 | 0.05 | 0.07 | 0.11 |
| 682 | 682ZZ | - | - | 2 | 5 | 15 | 23 | 0.08 | 169 | 50 | 17 | 5 | 85000 | - | 100000 | 2.6 | 2.7 | 4.4 | 4.2 | 0.08 | 0.08 | 0.12 | 0.17 |
| 682X | 682XZZ | - | - | 2.5 | 6 | 18 | 2.6 | 0.08 | 208 | 74 | 21 | 7.5 | 71000 | - | 80000 | 3.1 | 3.7 | 5.4 | 5.4 | 0.08 | 0.08 | 0.23 | 0.29 |
| 683A | 683AZZ | - | - | 3 | 7 | 2 | 3 | 0.1 | 390 | 130 | 40 | 13 | 63000 | - | 75000 | 3.8 | 4 | 6.2 | 6.4 | 0.1 | 0.1 | 0.32 | 0.45 |
| 684A | 684AZZ | - | - | 4 | 9 | 2.5 | 4 | -0.15 | 640 | 225 | 65 | 23 | 53000 | - | 63000 | 4.8 | 5.2 | 8.2 | 8.1 | 0.1 | 0.1 | 0.63 | 1.01 |
| 685 | 685ZZ | - | - | 5 | 11 | 3 | 5 | 0.15 | 715 | 281 | 73 | 29 | 45000 | - | 53000 | 6.2 | 6.2 | 9.8 | 9.9 | 0.15 | 0.15 | 1.2 | 1.96 |
| 686A | 686AZZ | 686AVV | 686ADD | 6 | 13 | 3.5 | 5 | 0.15 | 1080 | 440 | 110 | 45 | 40000 | 38000 | 50000 | 7.2 | 7.4 | 11.8 | 11.7 | 0.15 | 0.15 | 1.91 | 2.69 |
| 687 | 687ZZ1 | 687VV | 687DD | 7 | 14 | 3.5 | 5 | 0.15 | 1170 | 510 | 120 | 52 | 40000 | 34000 | 45000 | 8.2 | 8.5 | 12.8 | 12.7 | 0.15 | 0.15 | 2.13 | 2.97 |
| 688A | 688AZZ1 | 688AVV | 688ADD | 8 | 16 | 4 | 5 | 0.2 | 1610 | 710 | 164 | 73 | 36000 | 28000 | 43000 | 9.6 | 10.2 | 14.4 | 14.2 | 0.2 | 0.2 | 3.12 | 4.02 |
| 689 | 689ZZ1 | 689VV | 689DD | 9 | 17 | 4 | 5 | 0.2 | 1330 | 665 | 136 | 68 | 36000 | 24000 | 43000 | 10.6 | 11.5 | 15.4 | 15.2 | 0.2 | 0.2 | 3.53 | 4.43 |
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