https://www.accu.co.uk/p/117-iso-metric-thread-dimensions
Bolt Sizes Chart & Metric Bolt Dimensions
| THREAD SIZE | MAJOR DIAMETER (MM) | MINOR DIAMETER (MM) | THREAD PITCH (MM) | PITCH DIAMETER (MM) | TAPPING DRILL DIAMETER (MM) | CLEARANCE HOLE DIAMETER (MM) |
|---|---|---|---|---|---|---|
| M1 | 1.0 | 0.729 | 0.25 | 0.838 | 0.75 | 1.3 |
| M1.1 | 1.1 | 0.829 | 0.25 | 0.938 | 0.85 | 1.4 |
| M1.2 | 1.2 | 0.929 | 0.25 | 1.038 | 0.95 | 1.5 |
| M1.4 | 1.4 | 1.075 | 0.30 | 1.205 | 1.10 | 1.8 |
| M1.6 | 1.6 | 1.221 | 0.35 | 1.373 | 1.25 | 2.0 |
| M1.8 | 1.8 | 1.421 | 0.35 | 1.573 | 1.45 | 2.3 |
| M2 | 2.0 | 1.567 | 0.40 | 1.740 | 1.60 | 2.6 |
| M2.2 | 2.2 | 1.713 | 0.45 | 1.908 | 1.75 | 2.9 |
| M2.5 | 2.5 | 2.013 | 0.45 | 2.208 | 2.05 | 3.1 |
| M3 | 3.0 | 2.459 | 0.50 | 2.675 | 2.50 | 3.6 |
| M3.5 | 3.5 | 2.850 | 0.60 | 3.110 | 2.90 | 4.2 |
| M4 | 4.0 | 3.242 | 0.70 | 3.545 | 3.30 | 4.8 |
| M4.5 | 4.5 | 3.688 | 0.75 | 4.013 | 3.80 | 5.3 |
| M5 | 5.0 | 4.134 | 0.80 | 4.480 | 4.20 | 5.8 |
| M6 | 6.0 | 4.917 | 1.00 | 5.350 | 5.00 | 7.0 |
| M7 | 7.0 | 5.917 | 1.00 | 6.350 | 6.00 | 8.0 |
| M8 | 8.0 | 6.647 | 1.25 | 7.188 | 6.80 | 10.0 |
| M9 | 9.0 | 7.647 | 1.25 | 8.188 | 7.80 | 11.0 |
| M10 | 10.0 | 8.376 | 1.50 | 9.026 | 8.50 | 12.0 |
| M11 | 11.0 | 9.376 | 1.50 | 10.026 | 9.50 | 13.5 |
| M12 | 12.0 | 10.106 | 1.75 | 10.863 | 10.20 | 15.0 |
| M14 | 14.0 | 11.835 | 2.00 | 12.701 | 12.00 | 17.0 |
| M16 | 16.0 | 13.835 | 2.00 | 14.701 | 14.00 | 19.0 |
| M18 | 18.0 | 15.394 | 2.50 | 16.376 | 15.50 | 22.0 |
| M20 | 20.0 | 17.294 | 2.50 | 18.376 | 17.50 | 24.0 |
| M22 | 22.0 | 19.294 | 2.50 | 20.376 | 19.50 | 26.0 |
| M24 | 24.0 | 20.752 | 3.00 | 22.051 | 21.00 | 28.0 |
| M27 | 27.0 | 23.752 | 3.00 | 25.051 | 24.00 | 33.0 |
| M30 | 30.0 | 26.211 | 3.50 | 27.727 | 26.50 | 35.0 |
| M33 | 33.0 | 29.211 | 3.50 | 30.727 | 29.50 | 38 |
| M36 | 36.0 | 31.670 | 4.00 | 33.402 | 32.00 | 41 |
| M39 | 39.0 | 34.670 | 4.00 | 36.402 | 35.00 | 44 |
| M42 | 42.0 | 37.129 | 4.50 | 39.077 | 37.50 | 47 |
| M45 | 45.0 | 40.129 | 4.50 | 42.077 | 40.50 | 50 |
| M48 | 48.0 | 42.857 | 5.00 | 44.752 | 43.00 | 53 |
| M52 | 52.0 | 46.587 | 5.00 | 48.752 | 47.00 | 57 |
| M56 | 56.0 | 50.046 | 5.50 | 52.428 | 50.50 | 61 |
| M60 | 60.0 | 54.046 | 5.50 | 56.428 | 54.50 | 65 |
| M64 | 64.0 | 57.505 | 6.00 | 60.103 | 58.00 | 69 |
| M68 | 68.0 | 61.505 | 6.00 | 64.103 | 62.00 | 73 |