Plain Washers, Black : Metric Series
(Dimensions in Millimetres)
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| Designation | Internal Diameter | External Diameter | Thickness |
| (Thread | d1 | d2 | s |
| Diameter) | Max | Min | Max | Min | Max | Min |
|
| M5 | 5.8 | 5.5 | 10.0 | 9.2 | 1.2 | 0.8 |
| M6 | 7.0 | 6.6 | 12.5 | 11.7 | 1.9 | 1.3 |
| (M7) | 8.0 | 7.6 | 14.0 | 13.2 | 1.9 | 1.3 |
| M8 | 9.4 | 9.0 | 17.0 | 16.2 | 1.9 | 1.3 |
| M10 | 11.5 | 11.0 | 21.0 | 20.2 | 2.3 | 1.7 |
| M12 | 14.5 | 14.0 | 24.0 | 23.2 | 2.8 | 2.2 |
| (M14) | 16.5 | 16.0 | 28.0 | 27.2 | 2.8 | 2.2 |
| M16 | 18.5 | 18.0 | 30.0 | 29.0 | 3.6 | 2.4 |
| (M18) | 20.6 | 20.0 | 34.0 | 32.8 | 3.6 | 2.4 |
| M20 | 22.6 | 22.0 | 37.0 | 35.8 | 3.6 | 2.4 |
| (M22) | 24.6 | 24.0 | 39.0 | 37.8 | 3.6 | 2.4 |
| M24 | 26.6 | 26.0 | 44.0 | 42.8 | 4.6 | 3.4 |
| (M27) | 30.6 | 30.0 | 50.0 | 48.8 | 4.6 | 3.4 |
| M30 | 33.8 | 33.0 | 56.0 | 54.5 | 4.6 | 3.4 |
| (M33) | 36.8 | 36.0 | 60.0 | 58.5 | 6.0 | 4.0 |
| M36 | 39.8 | 39.0 | 66.0 | 64.5 | 6.0 | 4.0 |
| (M39) | 42.8 | 42.0 | 72.0 | 70.5 | 7.0 | 5.0 |
| M42 | 45.8 | 45.0 | 78.0 | 76.5 | 8.2 | 5.8 |
| M45 | 48.8 | 48.0 | 85.0 | 83.0 | 8.2 | 5.8 |
| M56 | 63.0 | 62.0 | 92.0 | 90.0 | 9.2 | 6.8 |
| (M60) | 67.0 | 66.0 | 110.0 | 108.0 | 10.2 | 7.8 |
| M64 | 71.0 | 70.0 | 115.0 | 113.0 | 10.2 | 7.8 |
| (M68) | 75.0 | 74.0 | 120.0 | 118.0 | 11.2 | 8.8 |
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Non-preferred sizes in brackets().
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