DIN 931 六角头盖螺钉/螺栓是一种外螺纹紧固件，头部为六角形垫圈，顶端有倒角，便于与内螺纹部件配合。
| d1 | b 至 125 | b 至 200 | b 超过 200 | k | e | s |
| M4 | 14 | - | - | 2.8 | 7.66 | 7 |
| M5 | 16 | - | - | 3.5 | 8.79 | 8 |
| M6 | 18 | 24 | - | 4 | 11.05 | 10 |
| M8 | 22 | 28 | - | 5.3 | 14.38 | 13 |
| M10 | 26 | 32 | 45 | 6.4 | 18.9 | 17 |
| M12 | 30 | 36 | 49 | 7.5 | 21.1 | 19 |
| M14 | 34 | 40 | 53 | 8.8 | 24.49 | 22 |
| M16 | 38 | 44 | 57 | 10 | 26.75 | 24 |
| M18 | 42 | 48 | 61 | 11.5 | 30.14 | 27 |
| M20 | 46 | 52 | 65 | 12.5 | 33.53 | 30 |
| M22 | 50 | 56 | 69 | 14 | 35.72 | 32 |
| M24 | 54 | 60 | 73 | 15 | 39.98 | 36 |
| M27 | 60 | 66 | 79 | 17 | 45.2 | 41 |
| M30 | 66 | 72 | 85 | 18.7 | 50.85 | 46 |
| M33 | 72 | 78 | 91 | 21 | 55.37 | 50 |
| M36 | 78 | 84 | 97 | 22.5 | 60.79 | 55 |
| M42 | 90 | 96 | 109 | 26 | 71.3 | 65 |
| M45 | 96 | 102 | 115 | 28 | 76.95 | 70 |
| M48 | 102 | 108 | 121 | 30 | 82.6 | 75 |
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