DIN 961 – 1990 – Bu lông lục giác
| Screw Thread | M8 | M10 | M12 | M14 | M16 | M18 | M20 | M22 | M24 | ||
| P | Pitch | Fine thread-1 | 1 | 1 | 1.5 | 1.5 | 1.5 | 2 | 1.5 | 2 | 2 |
| Fine thread-2 | – | 1.25 | 1.25 | – | – | 1.5 | 2 | 1.5 | 1.5 | ||
| a | max | 3 | 3.75 | 4.5 | 4.5 | 4.5 | 6 | 6 | 6 | 6 | |
| c | min | 0.15 | 0.15 | 0.15 | 0.15 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | |
| max | 0.6 | 0.6 | 0.6 | 0.6 | 0.8 | 0.8 | 0.8 | 0.8 | 0.8 | ||
| da | max | 9.2 | 11.2 | 13.7 | 15.7 | 17.7 | 20.2 | 22.4 | 24.4 | 26.4 | |
| dw | Grade A | min | 11.6 | 15.6 | 17.4 | 20.5 | 22.5 | 25.3 | 28.2 | 30 | 33.6 |
| Grade B | min | 11.4 | 15.4 | 17.2 | 20.1 | 22 | 24.8 | 27.7 | 29.5 | 33.2 | |
| e | Grade A | min | 14.38 | 18.9 | 21.1 | 24.49 | 26.75 | 30.14 | 33.53 | 35.72 | 39.98 |
| Grade B | min | 14.2 | 18.72 | 20.88 | 23.91 | 26.17 | 29.56 | 32.95 | 35.03 | 39.55 | |
| k | Nominal Size | 5.3 | 6.4 | 7.5 | 8.8 | 10 | 11.5 | 12.5 | 14 | 15 | |
| Grade A | min | 5.15 | 6.22 | 7.32 | 8.62 | 9.82 | 11.28 | 12.28 | 13.78 | 14.78 | |
| max | 5.45 | 6.58 | 7.68 | 8.98 | 10.18 | 11.72 | 12.72 | 14.22 | 15.22 | ||
| Grade B | min | 5.06 | 6.11 | 7.21 | 8.51 | 9.71 | 11.15 | 12.15 | 13.65 | 14.65 | |
| max | 5.54 | 6.69 | 7.79 | 9.09 | 10.29 | 11.85 | 12.85 | 14.35 | 15.35 | ||
| k1 | min | 3.54 | 4.28 | 5.05 | 5.96 | 6.8 | 7.8 | 8.5 | 9.6 | 10.3 | |
| r | min | 0.4 | 0.4 | 0.6 | 0.6 | 0.6 | 0.6 | 0.8 | 0.8 | 0.8 | |
| s | max=nominal size | 13 | 17 | 19 | 22 | 24 | 27 | 30 | 32 | 36 | |
| Grade A | min | 12.73 | 16.73 | 18.67 | 21.67 | 23.67 | 26.67 | 29.67 | 31.61 | 35.38 | |
| Grade B | min | 12.57 | 16.57 | 18.48 | 21.16 | 23.16 | 26.16 | 29.16 | 31 | 35 | |
| Weight of per 1000 steel products(≈kg) | – | – | – | – | – | – | – | – | – | ||
| Screw Thread | M27 | M30 | M33 | M36 | M39 | M42 | M45 | M48 | M52 | ||
| P | Pitch | Fine thread-1 | 2 | 2 | 2 | 3 | 3 | 3 | 3 | 3 | 3 |
| Fine thread-2 | – | – | – | – | – | – | – | – | – | ||
| a | max | 6 | 6 | 6 | 9 | 9 | 9 | 9 | 9 | 9 | |
| c | min | 0.2 | 0.2 | 0.2 | 0.2 | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 | |
| max | 0.8 | 0.8 | 0.8 | 0.8 | 1 | 1 | 1 | 1 | 1 | ||
| da | max | 30.4 | 33.4 | 36.4 | 39.4 | 42.4 | 45.6 | 48.6 | 52.6 | 56.6 | |
| dw | Grade A | min | – | – | – | – | – | – | – | – | – |
| Grade B | min | 38 | 42.7 | 46.6 | 51.1 | 55.9 | 59.9 | 64.7 | 69.4 | 74.2 | |
| e | Grade A | min | – | – | – | – | – | – | – | – | – |
| Grade B | min | 45.2 | 50.85 | 55.37 | 60.79 | 66.44 | 71.3 | 76.95 | 82.6 | 88.25 | |
| k | Nominal Size | 17 | 18.7 | 21 | 22.5 | 25 | 26 | 28 | 30 | 33 | |
| Grade A | min | – | – | – | – | – | – | – | – | – | |
| max | – | – | – | – | – | – | – | – | – | ||
| Grade B | min | 16.65 | 18.28 | 20.58 | 22.08 | 24.58 | 25.58 | 27.58 | 29.58 | 32.5 | |
| max | 17.35 | 19.12 | 21.42 | 22.92 | 25.42 | 26.42 | 28.42 | 30.42 | 33.5 | ||
| k1 | min | 11.7 | 12.8 | 14.4 | 15.5 | 17.2 | 17.9 | 19.3 | 20.9 | 22.8 | |
| r | min | 1 | 1 | 1 | 1 | 1 | 1.2 | 1.2 | 1.6 | 1.6 | |
| s | max=nominal size | 41 | 46 | 50 | 55 | 60 | 65 | 70 | 75 | 80 | |
| Grade A | min | – | – | – | – | – | – | – | – | – | |
| Grade B | min | 40 | 45 | 49 | 53.8 | 58.8 | 63.1 | 68.1 | 73.1 | 78.1 | |
| Weight of per 1000 steel products(≈kg) | – | – | – | – | – | – | – | – | – | ||
