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The selection and use of bearings is crucial. Measuring systems used may vary from country to country and region to region. This article will detail how to convert from inch to metric bearing sizes to help engineers and purchasers more easily select the right bearing specifications. This conversion table will provide you with clear and accurate conversion data so that you can switch between different standards more smoothly. Understanding and mastering this conversion method will greatly improve work efficiency and accuracy, whether in the design stage of a project or the actual application process. A PDF version is also available for download. (Printable PDF)
| INCHES | DECIMAL | MM |
| 1/32 | 0.031 | 0.79 |
| 1/16 | 0.062 | 1.59 |
| 3./32 | 0.094 | 2.38 |
| 1/8 | 0.125 | 3.18 |
| 5/32 | 0.156 | 3.97 |
| 3/16 | 0.187 | 4.76 |
| 7/32 | 0.219 | 5.55 |
| 1/4 | 0.25 | 6.35 |
| 9/32 | 0.281 | 7.14 |
| 5/16 | 0.312 | 7.94 |
| 11/32 | 0.343 | 8.73 |
| 3/8 | 0.375 | 9.53 |
| 13/32 | 0.406 | 10.32 |
| 7/16 | 0.437 | 11.11 |
| 15/32 | 0.469 | 11.91 |
| 1/2 | 0.5 | 12.7 |
| 17/31 | 0.531 | 13.49 |
| 9/16 | 0.562 | 14.29 |
| 19/32 | 0.594 | 15.08 |
| 5/8 | 0.625 | 15.88 |
| 21/32 | 0.656 | 16.67 |
| 11/16 | 0.687 | 17.46 |
| 23/32 | 0.719 | 18.26 |
| 3/4 | 0.75 | 19.05 |
| 25/32 | 0.781 | 19.84 |
| 13/16 | 0.812 | 20.64 |
| 27/32 | 0.844 | 21.43 |
| 7/8 | 0.875 | 22.23 |
| 29/32 | 0.906 | 23.02 |
| 15/16 | 0.937 | 23.81 |
| 31/32 | 0.969 | 24.61 |
| 1 | 1 | 25.4 |
| 1.1/16 | 1.062 | 26.99 |
| 1.1/8 | 1.125 | 28.58 |
| 1.3/16 | 1.187 | 30.16 |
| 1.1/4 | 1.25 | 31.75 |
| 1.5/16 | 1.312 | 33.34 |
| 1.3/8 | 1.375 | 34.93 |
| 1.7/16 | 1.437 | 36.51 |
| 1.1/2 | 1.5 | 38.1 |
| 1.9/16 | 1.562 | 39.69 |
| 1.5/8 | 1.625 | 41.28 |
| 1.11/16 | 1.687 | 42.86 |
| 1.3/4 | 1.75 | 44.45 |
| 1.13/16 | 1.812 | 46.04 |
| 1.7/8 | 1.875 | 47.63 |
| 1.15/46 | 1.937 | 49.21 |
| 2 | 2 | 50.8 |
| 2.1/8 | 2.125 | 53.98 |
| 2.1/4 | 2.25 | 57.15 |
| 2.3/8 | 2.375 | 60.33 |
| 2.1/2 | 2.5 | 63.5 |
| 2.5/8 | 2.625 | 66.68 |
| 2.3/4 | 2.75 | 69.85 |
| 2.7/8 | 2.875 | 73.03 |
| 3 | 3 | 76.2 |
| 3.1/8 | 3.125 | 79.38 |
| 3.1/4 | 3.25 | 82.55 |
| 3.3/8 | 3.375 | 85.73 |
| 3.1/2 | 3.5 | 88.9 |
| 3.5/8 | 3.625 | 92.08 |
| 3.3/4 | 3.75 | 95.25 |
| 3.7/8 | 3.875 | 98.43 |
| 4 | 4 | 101.6 |
| 4.1/8 | 4.125 | 104.78 |
| 4.1/4 | 4.25 | 107.95 |
| 4.3/8 | 4.375 | 111.13 |
| 4.1/2 | 4.5 | 114.3 |
| 4.5/8 | 4.625 | 117.48 |
| 4.3/4 | 4.75 | 120.65 |
| 4.7/8 | 4.875 | 123.83 |
| 5 | 5 | 127 |
| 5.1/8 | 5.125 | 130.18 |
| 5.1/4 | 5.25 | 133.35 |
| 5.3/8 | 5.375 | 136.53 |
| 5.1/2 | 5.5 | 139.7 |
| 5.5/8 | 5.625 | 142.88 |
| 5.3/4 | 5.75 | 146.05 |
| 5.7/8 | 5.875 | 149.23 |
| 6 | 6 | 152.4 |
| 6.1/8 | 6.125 | 155.58 |
| 6.1/4 | 6.25 | 158.75 |
| 6.3/8 | 6.375 | 161.92 |
| 6.1/2 | 6.5 | 165.1 |
| 6.5/8 | 6.625 | 168.28 |
| 6.3/4 | 6.75 | 171.45 |
| 6.7/8 | 6.875 | 174.63 |
| 7 | 7 | 177.8 |
| 7.1/8 | 7.125 | 180.98 |
| 7.1/4 | 7.25 | 184.15 |
| 7.3/8 | 7.375 | 187.33 |
| 7.1/2 | 7.5 | 190.5 |
| 7.5/8 | 7.625 | 193.68 |
| 7.3/4 | 7.75 | 196.85 |
| 7.7/8 | 7.875 | 200.03 |
| 8 | 8 | 203.2 |
| 8.1/4 | 8.25 | 209.55 |
| 8.1/2 | 8.5 | 215.9 |
| 8.3/4 | 8.75 | 222.25 |
| 9 | 9 | 228.6 |
| 9.1/4 | 9.25 | 234.95 |
| 9.1/2 | 9.5 | 241.3 |
| 9.3/4 | 9.75 | 247.65 |
| 10 | 10 | 254 |
| 10.1/4 | 10.25 | 260.35 |
| 10.1/2 | 10.5 | 266.7 |
| 10.3/4 | 10.75 | 273.05 |
| 11 | 11 | 279.4 |
| 11.1/4 | 11.25 | 285.75 |
| 11.1/2 | 11.5 | 292.1 |
| 11.3/4 | 11.75 | 298.45 |
| 12 | 12 | 304.8 |
| 12.1/4 | 12.25 | 311.15 |
| 12.1/2 | 12.5 | 317.5 |
| 12.3/4 | 12.75 | 323.85 |
| 13 | 13 | 330.2 |
| 13.1/4 | 13.25 | 336.55 |
| 13.1/2 | 13.5 | 342.9 |
| 13.3/4 | 13.75 | 349.25 |
| 14 | 14 | 355.6 |
| 14.1/4 | 14.25 | 361.95 |
| 14.1/2 | 14.5 | 368.3 |
| 14.3/4 | 14.75 | 374.65 |
| 15 | 15 | 381 |
| 15.1/4 | 15.25 | 387.35 |
| 15.1/2 | 15.5 | 393.7 |
| 15.3/4 | 15.75 | 400.05 |
| 16 | 16 | 406.4 |
| 16.1/4 | 16.25 | 412.75 |
| 16.1/2 | 16.5 | 419.1 |
| 16.3/4 | 16.75 | 425.45 |
| 17 | 17 | 431.8 |
| 17.1/4 | 17.25 | 438.15 |
| 17.1/2 | 17.5 | 444.5 |
| 17.3/4 | 17.75 | 450.85 |
| 18 | 18 | 457.2 |
| 18.1/4 | 18.25 | 463.55 |
| 18.1/2 | 18.5 | 569.9 |
| 18.3/4 | 18.75 | 476.25 |
| 19 | 19 | 482.6 |
| 19.1/4 | 19.25 | 488.95 |
| 19.1/2 | 19.5 | 495.3 |
| 19.3/4 | 19.75 | 501.65 |
| 20 | 20 | 508 |
