Fastener Dimensions
Coarse Thread Bolt and Nuts Metric (mm)
| Nominal Diameter | Pitch | Bolt Head Thickness | Bolt Across Flats | Nut Thickness | |
|---|---|---|---|---|---|
| M3 | 3 | 0.5 | 2.125 | 5.5 | 2.4 |
| M4 | 4 | 0.7 | 2.925 | 7 | 3.2 |
| M5 | 5 | 0.8 | 3.65 | 8 | 4 |
| M6 | 6 | 1 | 4.15 | 10 | 5 |
| M8 | 8 | 1.25 | 5.65 | 13 | 6.5 |
| M10 | 10 | 1.5 | 7.18 | 17 | 8 |
| M12 | 12 | 1.75 | 8.18 | 19 | 10 |
| M16 | 16 | 2 | 10.18 | 24 | 13 |
| M20 | 20 | 2.5 | 13.215 | 30 | 16 |
| M24 | 24 | 3 | 15.215 | 36 | 19 |
| M30 | 30 | 3.5 | 19.26 | 46 | 24 |
| M36 | 36 | 4 | 23.26 | 55 | 29 |
Fine Thread Bolt and Nuts Metric (mm)
| Nominal Diameter | Pitch | Bolt Head Thickness | Bolt Across Flats | Nut Thickness | |
|---|---|---|---|---|---|
| M6 | 6 | 0.75 | 4.15 | 10 | 5 |
| M8 | 8 | 1 | 5.65 | 13 | 6.5 |
| M10 | 10 | 1.25 | 7.18 | 17 | 8 |
| M12 | 12 | 1.25 | 8.18 | 19 | 10 |
| M16 | 16 | 1.5 | 10.18 | 24 | 13 |
| M20 | 20 | 1.5 | 13.215 | 30 | 16 |
| M24 | 24 | 2 | 15.215 | 36 | 19 |
| M30 | 30 | 2 | 19.26 | 46 | 24 |
| M36 | 36 | 3 | 23.26 | 55 | 29 |
Plain Washers/Bright Metric (mm)
| Internal Diameter | External Diameter | Thickness (Thick Varient) | Thickness (Thin Varient) | |
|---|---|---|---|---|
| M3 | 3.2 | 7 | 0.6 | - |
| M4 | 4.3 | 9 | 0.9 | - |
| M5 | 5.3 | 10 | 1.1 | - |
| M6 | 6.4 | 12.5 | 1.8 | 0.9 |
| M8 | 8.4 | 17 | 1.8 | 1.1 |
| M10 | 10.5 | 21 | 2.2 | 1.45 |
| M12 | 13 | 24 | 2.7 | 1.8 |
| M16 | 17 | 30 | 3.3 | 2.2 |
| M20 | 21 | 37 | 3.3 | 2.2 |
| M24 | 25 | 44 | 4.3 | 2.7 |
| M30 | 31 | 56 | 4.3 | 2.7 |
| M36 | 37 | 66 | 5.6 | 3.3 |
Plain Washers/Black Metric (mm)
| Internal Diameter | External Diameter | Thickness | |
|---|---|---|---|
| M5 | 5.5 | 10 | 1.2 |
| M6 | 6.6 | 12.5 | 1.9 |
| M8 | 9 | 17 | 1.9 |
| M10 | 11 | 21 | 2.3 |
| M12 | 14 | 24 | 2.8 |
| M16 | 18 | 30 | 3.6 |
| M20 | 22 | 37 | 3.6 |
| M24 | 26 | 44 | 4.6 |
| M30 | 33 | 56 | 4.6 |
| M36 | 39 | 66 | 6 |
| M42 | 45 | 78 | 8.2 |
| M48 | 52 | 92 | 9.2 |