Dimensions of ASME B18.2.4.6M Metric Heavy Hex Nuts:
| Nominal Nut Diameter and Thread Pitch | Width Across Flats, S | Width Across Corners, E | Thickness M | Bearing Face Diameter, Dw, Min | Washer Face Thickness, C | ||||
| Max | Min | Max | Min | Max | Min | Max | Min | ||
| M12 x 1.75 | 21 | 20.16 | 24.25 | 22.78 | 12.3 | 11.9 | 19.2 | 0.8 | 0.4 |
| M14 x 2 | 24 | 23.16 | 27.71 | 26.17 | 14.3 | 13.6 | 22 | 0.8 | 0.4 |
| M16 x 2 | 27 | 26.16 | 31.18 | 29.56 | 17.1 | 16.4 | 24.9 | 0.8 | 0.4 |
| M20 x 2.5 | 34 | 33 | 39.26 | 37.29 | 20.7 | 19.4 | 31.4 | 0.8 | 0.4 |
| M22 x 2.5 | 36 | 35 | 41.57 | 39.55 | 23.6 | 22.3 | 33.3 | 0.8 | 0.4 |
| M24 x 3 | 41 | 40 | 47.34 | 45.2 | 24.2 | 22.9 | 38 | 0.8 | 0.4 |
| M27 x 3 | 46 | 45 | 53.12 | 50.85 | 27.6 | 26.3 | 42.8 | 0.8 | 0.4 |
| M30 x 3.5 | 50 | 49 | 57.74 | 55.37 | 30.7 | 29.1 | 46.6 | 0.8 | 0.4 |
| M36 x 4 | 60 | 58.8 | 69.28 | 66.44 | 36.6 | 35 | 55.9 | 0.8 | 0.4 |
| M42 x 4.5 | 70 | 67.9 | 80.83 | 77.41 | 42 | 40.4 | 64.5 | 1 | 0.5 |
| M48 x 5 | 80 | 77.6 | 92.38 | 88.46 | 48 | 46.4 | 73.7 | 1 | 0.5 |
| M56 x 5.5 | 90 | 87.2 | 103.92 | 99.41 | 56 | 54.1 | 82.8 | 1 | 0.5 |
| M64 x 6 | 100 | 96.8 | 115.47 | 110.35 | 64 | 62.1 | 92 | 1 | 0.5 |
| M72 x 6 | 110 | 106.4 | 127.02 | 121.3 | 72 | 70 | 101.1 | 1.2 | 0.6 |
| M80 x 6 | 120 | 116 | 138.56 | 132.24 | 80 | 78.1 | 110.2 | 1.2 | 0.6 |
| M90 x 56 | 135 | 130.5 | 155.88 | 148.77 | 90 | 87.8 | 124 | 1.2 | 0.6 |
| M100 x 6 | 150 | 145 | 173.21 | 165.3 | 100 | 97.8 | 137.8 | 1.2 | 0.6 |
All dimensions are in millimeters.