ASME B18.2.3.5M Metric Hex Bolts
ASME B18.2.3.5M Metric Hex Bolts
Dimensions of Metric Hex Bolts
| Nominal Bolt Diameter, D, and Thread Pitch | Body Diameter Ds | Width Across Flats, S | Width Across Corners, E | Head Height, K | Wrenching Height, K1, Min | For Bolt Lengths Basic Thread Length, a B |
||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Max | Min | Max | Min | Max | Min | Max | Min | < 125mm | > 125 and < 200mm | > 200mm | ||
| M5 x 0.8 | 5.48 | 4.52 | 8.00 | 7.64 | 9.24 | 8.63 | 3.58 | 3.35 | 2.4 | 16 | 22 | 35 |
| M6 x 1 | 6.19 | 5.52 | 10.00 | 9.64 | 11.55 | 10.89 | 4.38 | 3.55 | 2.8 | 18 | 24 | 37 |
| M8 x 1.25 | 8.58 | 7.42 | 13.00 | 12.57 | 15.01 | 14.20 | 5.68 | 5.10 | 3.7 | 22 | 28 | 41 |
| aM10 x 1.5 | 10.58 | 9.42 | 15.00 | 14.57 | 17.32 | 16.46 | 6.85 | 6.17 | 4.5 | 26 | 32 | 45 |
| M10 x 1.5 | 10.58 | 9.42 | 16.00 | 15.57 | 18.48 | 17.59 | 6.85 | 6.17 | 4.5 | 26 | 32 | 45 |
| M12 x 1.75 | 12.70 | 11.30 | 18.00 | 17.57 | 20.78 | 19.85 | 7.95 | 7.24 | 5.2 | 30 | 36 | 49 |
| M14 x 2 | 14.70 | 13.30 | 21.00 | 20.16 | 24.25 | 22.78 | 9.25 | 8.51 | 6.2 | 34 | 40 | 53 |
| M16 x 2 | 16.70 | 15.30 | 24.00 | 23.16 | 27.71 | 26.17 | 10.75 | 9.68 | 7.0 | 38 | 44 | 57 |
| M20 x 2.5 | 20.84 | 19.16 | 30.00 | 29.16 | 34.64 | 32.95 | 13.40 | 12.12 | 8.8 | 46 | 52 | 65 |
| M24 x 3 | 24.84 | 23.16 | 36.00 | 35.00 | 41.57 | 39.55 | 15.90 | 14.56 | 10.5 | 54 | 60 | 73 |
| M30 x 3.5 | 30.84 | 29.16 | 46.00 | 45.00 | 5312 | 50.55 | 19.78 | 17.92 | 13.1 | 66 | 72 | 85 |
| M36 x 4 | 37.00 | 35.00 | 55.00 | 53.80 | 63.51 | 60.79 | 23.55 | 21.72 | 15.8 | 78 | 84 | 97 |
| M42 x 4.5 | 43.00 | 41.00 | 65.00 | 62.90 | 75.06 | 71.71 | 27.05 | 25.03 | 18.2 | 90 | 96 | 109 |
| M48 x 5 | 49.00 | 47.00 | 75.00 | 72.60 | 86.60 | 82.76 | 31.07 | 28.93 | 21.0 | 102 | 108 | 121 |
| M56 x 5.5 | 57.20 | 54.80 | 85.00 | 82.20 | 98.15 | 93.71 | 36.20 | 33.80 | 24.5 | -- | 124 | 137 |
| M64 x 6 | 65.52 | 62.80 | 95.00 | 91.80 | 109.70 | 104.65 | 41.32 | 38.68 | 28.0 | -- | 140 | 153 |
| M72 x 6 | 73.84 | 70.80 | 105.00 | 101.40 | 121.24 | 115.60 | 46.45 | 43.55 | 31.5 | -- | 156 | 169 |
| M80 x 6 | 82.16 | 78.80 | 115.00 | 111.00 | 132.79 | 126.54 | 51.58 | 48.42 | 35.0 | -- | 172 | 185 |
| M90 x 6 | 92.48 | 88.60 | 130.00 | 125.50 | 150.11 | 143.07 | 57.74 | 54.26 | 39.2 | -- | 192 | 205 |
| M100 x 6 | 102.80 | 98.60 | 145.00 | 140.00 | 167.43 | 159.60 | 63.90 | 60.10 | 43.4 | -- | 212 | 225 |
1. aBasic thread length, B, is a reference dimension.
2. bThis size with width across flats of 15 mm is not standard. Unless specifically
ordered,
M10 hex bolts with 16mm width across flats will be furnished.
