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Powerlong supplied inch size stainless mininature ball bearing MR series. They have special dimensions which are comparatively small with inner diameter from 2 to 8 millimetre. They are suitable for thin shafts and axis as well as for appropriate small space requirements. In the ratio to its small size, mininature deep groove ball bearing can bear relatively high loads. They are suitable for an extremly high rotational speed.
Seals
Rubber seals(RS/2RS) have the optimum sealing action with increased friction. Metal seals(Z/ZZ) for higher speeds,but they have a limited sealing action as they seal contactless. Open, or seal-less bearings are suitable for extremly high speeds and they can be regreased more easiler. However, they are more suscpetible to soiling.
| select | Inquiry | 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 | |||||||||||||||||||||||
| MR31 | - | - | - | 1 | 3 | 15 | - | 0.05 | 80 | 23 | 8 | 2.5 | 130000 | - | 150000 | 1.4 | - | 2.6 | - | 0.05 | - | 0.04 | - | ||
| MR41X | MR41XZZ | - | - | 1.2 | 4 | 1.8 | 2.5 | 0.1 | 138 | 35 | 14 | 3.5 | 110000 | - | 130000 | 2 | 1.9 | 3.2 | 3.5 | 0.1 | 0.1 | 0.1 | 0.14 | ||
| MR52B | MR52BZZ | - | - | 2 | 5 | 2 | 25 | 0.1 | 187 | 58 | 19 | 6 | 85000 | - | 100000 | 2.8 | 2.7 | 4.2 | 4.4 | 0.1 | 0.1 | 0.16 | 0.23 | ||
| MR62 | MR62ZZ | - | - | 2 | 6 | 25 | 2.5 | 0.15 | 330 | 98 | 34 | 10 | 75000 | - | 90000 | 3.2 | 3 | 4.8 | 5.2 | 0.15 | 0.15 | 0.3 | 0.29 | ||
| MR72 | MR72ZZ | - | - | 2 | 7 | 25 | 3 | 0.15 | 385 | 127 | 39 | 13 | 63000 | - | 75000 | 3.2 | 3.8 | 5.8 | 6.2 | 0.15 | 0.15 | 0.45 | 0.49 | ||
| MR82X | - | - | - | 2.5 | 8 | 25 | - | 2 | 560 | 179 | 57 | 18 | 60000 | - | 67000 | 4.1 | - | 6.4 | - | 0.2 | - | 0.56 | - | ||
| MR63 | MR63ZZ | - | - | 3 | 6 | 2 | 2.5 | 0.1 | 208 | 74 | 21 | 7.5 | 71000 | - | 80000 | 3.8 | 3.7 | 5.2 | 5.4 | 0.1 | 0.1 | 0.2 | 0.27 | ||
| MR83 | - | - | - | 3 | 8 | 2.5 | - | 0.15 | 560 | 179 | 57 | 18 | 60000 | - | 67000 | 4.2 | - | 6.8 | - | 0.15 | - | 0.54 | - | ||
| MR93 | MR93ZZ | - | - | 3 | 9 | 25 | 4 | 0.2 | 570 | 187 | 58 | 19 | 56000 | - | 67000 | 4.6 | 4.3 | 7.4 | 7.9 | 0.2 | 0.15 | 0.73 | 1.18 | ||
| MR74 | - | - | - | 4 | 7 | 2 | - | 0.1 | 310 | 115 | 32 | 12 | 60000 | - | 67000 | 4.8 | - | 6.2 | - | 0.1 | - | 0.22 | - | ||
| - | MR74ZZ | - | - | 4 | 7 | - | 25 | - | 255 | 107 | 26 | 11 | 60000 | - | 71000 | - | 4.8 | - | 6.3 | - | 0.1 | - | 0.29 | ||
| MR84 | MR84ZZ | - | - | 4 | 8 | 2 | 3 | 0.15 | 395 | 139 | 40 | 14 | 56000 | - | 67000 | 5.2 | 5 | 6.8 | 7.4 | 0.15 | 0.1 | 0.36 | 0.56 | ||
| MR104B | MR104BZZ | - | - | 4 | 10 | 3 | 4 | 0.2 | 710 | 270 | 73 | 28 | 50000 | - | 60000 | 5.6 | 5.9 | 8.4 | 8.8 | 0.2 | 0.15 | 1.04 | 1.42 | ||
| MR85 | - | - | - | 5 | 8 | 2 | - | 0.1 | 310 | 120 | 31 | 12 | 53000 | - | 63000 | 5.8 | - | 7.2 | - | 0.1 | - | 0.26 | - | ||
| - | MR85ZZ | - | - | 5 | 8 | - | 2.5 | - | 278 | 131 | 28 | 13 | 53000 | - | 63000 | - | 5.8 | - | 7.4 | - | 0.1 | - | 0.34 | ||
| MR95 | MR95ZZ1 | - | - | 5 | 9 | 2.5 | 3 | 0.15 | 430 | 168 | 44 | 17 | 50000 | - | 60000 | 6.2 | 6 | 7.8 | 8.2 | 0.15 | 0.15 | 0.5 | 0.58 | ||
| MR105 | MR105ZZ | - | - | 5 | 10 | 3 | 4 | 0.15 | 430 | 168 | 44 | 17 | 50000 | - | 60000 | 6.2 | 6 | 8.8 | 8.4 | 0.15 | 0.15 | 0.95 | 1.29 | ||
| - | MR115ZZ | MR115VV | - | 5 | 11 | - | 4 | - | 715 | 276 | 73 | 28 | 48000 | - | 56000 | - | 6.3 | - | 9.8 | - | 0.15 | - | 1.49 | ||
| MR106 | MR106ZZ1 | - | - | 6 | 10 | 2.5 | 3 | 0.15 | 495 | 218 | 51 | 22 | 45000 | - | 53000 | 7.2 | 7 | 8.8 | 9.3 | 0.15 | 0.1 | 0.56 | 0.68 | ||
| MR126 | MR126ZZ | - | MR126DD | 6 | 12 | 3 | 4 | 0.2 | 715 | 292 | 73 | 30 | 43000 | 40000 | 50000 | 7.6 | 7.2 | 10.4 | 10.9 | 0.2 | 0.15 | 1.27 | 1.74 | ||
| MR117 | MR117ZZ | - | - | 7 | 11 | 2.5 | 3 | 0.15 | 455 | 201 | 47 | 21 | 43000 | - | 50000 | 8.2 | 8 | 9.8 | 10.5 | 0.15 | 0.1 | 0.62 | 0.72 | ||
| MR137 | MR137ZZ | - | - | 7 | 13 | 3 | 4 | 0.2 | 540 | 276 | 55 | 28 | 40000 | - | 48000 | 8.6 | 9 | 11.4 | 11.6 | 0.2 | 0.15 | 1.58 | 2.02 | ||
| MR128 | MR128ZZ1 | - | - | 8 | 12 | 2.5 | 3.5 | 0.15 | 545 | 274 | 56 | 28 | 40000 | - | 48000 | 9.2 | 9 | 10.8 | 11.3 | 0.15 | 0.1 | 0.71 | 0.97 | ||
| MR148 | MR148ZZ | MR148VV | MR148DD | 8 | 14 | 3.5 | 4 | 0.2 | 820 | 385 | 83 | 39 | 38000 | 32000 | 45000 | 9.6 | 9.2 | 12.4 | 12.8 | 0.2 | 0.15 | 1.86 | 2.16 | ||
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