DIN 931 (-1) – 1987 – Bu lông lục giác
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DIN 931 (-1) – 1987 – Bu lông lục giác
| Screw Thread | M1.6 | M2 | M2.5 | M3 | (M3.5) | M4 | M5 | M6 | (M7) | M8 | M10 | M12 | |||
| P | Thread Pitch | 0.35 | 0.4 | 0.45 | 0.5 | 0.6 | 0.7 | 0.8 | 1 | 1 | 1.25 | 1.5 | 1.75 | ||
| b | L≤125 | 9 | 10 | 11 | 12 | 13 | 14 | 16 | 18 | 20 | 22 | 26 | 30 | ||
| 125＜L≤200 | – | – | – | – | – | – | 22 | 24 | 26 | 28 | 32 | 36 | |||
| L＞200 | – | – | – | – | – | – | – | – | – | – | 45 | 49 | |||
| c | min | 0.1 | 0.1 | 0.1 | 0.15 | 0.15 | 0.15 | 0.15 | 0.15 | 0.15 | 0.15 | 0.15 | 0.15 | ||
| max | 0.25 | 0.25 | 0.25 | 0.4 | 0.4 | 0.4 | 0.5 | 0.5 | 0.5 | 0.6 | 0.6 | 0.6 | |||
| da | max | 2 | 2.6 | 3.1 | 3.6 | 4.1 | 4.7 | 5.7 | 6.8 | 7.8 | 9.2 | 11.2 | 13.7 | ||
| ds | max=nominal size | 1.6 | 2 | 2.5 | 3 | 3.5 | 4 | 5 | 6 | 7 | 8 | 10 | 12 | ||
| Grade A | min | 1.46 | 1.86 | 2.36 | 2.86 | 3.32 | 3.82 | 4.82 | 5.82 | 6.78 | 7.78 | 9.78 | 11.73 | ||
| Grade B | min | – | – | – | – | – | – | – | – | – | – | – | – | ||
| dw | Grade A | min | 2.4 | 3.2 | 4.1 | 4.6 | 5.1 | 5.9 | 6.9 | 8.9 | 9.8 | 11.6 | 15.6 | 17.4 | |
| Grade B | min | – | – | – | – | – | – | – | – | – | – | – | – | ||
| e | Grade A | min | 3.41 | 4.32 | 5.45 | 6.01 | 6.58 | 7.66 | 8.79 | 11.05 | 12.12 | 14.38 | 18.9 | 21.1 | |
| Grade B | min | – | – | – | – | – | – | – | – | – | – | – | – | ||
| k | Nominal Size | 1.1 | 1.4 | 1.7 | 2 | 2.4 | 2.8 | 3.5 | 4 | 4.8 | 5.3 | 6.4 | 7.6 | ||
| Grade A | min | 0.98 | 1.28 | 1.58 | 1.88 | 2.28 | 2.68 | 3.35 | 3.85 | 4.65 | 5.15 | 6.22 | 7.32 | ||
| max | 1.22 | 1.52 | 1.82 | 2.12 | 2.52 | 2.92 | 3.65 | 4.15 | 4.95 | 5.45 | 6.58 | 7.68 | |||
| Grade B | min | – | – | – | – | – | – | – | – | – | – | – | – | ||
| max | – | – | – | – | – | – | – | – | – | – | – | – | |||
| k1 | min | 0.7 | 0.9 | 1.1 | 1.3 | 1.6 | 1.9 | 2.28 | 2.63 | 3.19 | 3.54 | 4.28 | 5.05 | ||
| r | min | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.2 | 0.2 | 0.25 | 0.25 | 0.4 | 0.4 | 0.6 | ||
| s | max=nominal size | 3.2 | 4 | 5 | 5.5 | 6 | 7 | 8 | 10 | 11 | 13 | 17 | 19 | ||
| Grade A | min | 3.02 | 3.82 | 4.82 | 5.32 | 5.82 | 6.78 | 7.78 | 9.78 | 10.73 | 12.73 | 16.73 | 18.67 | ||
| Grade B | min | – | – | – | – | – | – | – | – | – | – | – | – | ||
| Length of Thread b | – | – | – | – | – | – | – | – | – | – | – | – | |||
| Screw Thread | (M14) | M16 | (M18) | M20 | (M22) | M24 | (M27) | M30 | (M33) | M36 | (M39) | ||||
| P | Thread Pitch | 2 | 2 | 2.5 | 2.5 | 2.5 | 3 | 3 | 3.5 | 3.5 | 4 | 4 | |||
| b | L≤125 | 34 | 38 | 42 | 46 | 50 | 54 | 60 | 66 | 72 | 78 | 84 | |||
| 125＜L≤200 | 40 | 44 | 48 | 52 | 56 | 60 | 66 | 72 | 78 | 84 | 90 | ||||
| L＞200 | 53 | 57 | 61 | 65 | 69 | 73 | 79 | 85 | 91 | 97 | 103 | ||||
| c | min | 0.15 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.3 | |||
| max | 0.6 | 0.8 | 0.8 | 0.8 | 0.8 | 0.8 | 0.8 | 0.8 | 0.8 | 0.8 | 1 | ||||
| da | max | 15.7 | 17.7 | 20.2 | 22.4 | 24.4 | 26.4 | 30.4 | 33.4 | 36.4 | 39.4 | 42.4 | |||
| ds | max=nominal size | 14 | 16 | 18 | 20 | 22 | 24 | 27 | 30 | 33 | 36 | 39 | |||
| Grade A | min | 13.73 | 15.73 | 17.73 | 19.67 | 21.67 | 23.67 | – | – | – | – | – | |||
| Grade B | min | – | 15.57 | 17.57 | 19.48 | 21.48 | 23.48 | 26.48 | 29.48 | 32.38 | 35.38 | 38.38 | |||
| dw | Grade A | min | 20.5 | 22.6 | 25.3 | 28.2 | 30 | 33.6 | – | – | – | – | – | ||
| Grade B | min | – | 22 | 24.8 | 27.7 | 29.5 | 33.2 | 38 | 42.7 | 46.6 | 51.1 | 55.9 | |||
| e | Grade A | min | 24.49 | 26.75 | 30.14 | 33.53 | 35.72 | 39.98 | – | – | – | – | – | ||
| Grade B | min | – | 26.17 | 29.56 | 32.95 | 35.03 | 39.55 | 45.2 | 50.85 | 55.37 | 60.79 | 66.44 | |||
| k | Nominal Size | 8.8 | 10 | 11.5 | 12.5 | 14 | 15 | 17 | 18.7 | 21 | 22.5 | 25 | |||
| Grade A | min | 8.62 | 9.82 | 11.28 | 12.28 | 13.78 | 14.78 | – | – | – | – | – | |||
| max | 8.98 | 10.18 | 11.72 | 12.72 | 14.22 | 15.22 | – | – | – | – | – | ||||
| Grade B | min | – | 9.71 | 11.15 | 12.15 | 13.65 | 14.65 | 16.65 | 18.28 | 20.58 | 22.08 | 24.58 | |||
| max | – | 10.29 | 11.85 | 12.85 | 14.35 | 15.35 | 17.35 | 19.12 | 21.42 | 22.92 | 25.42 | ||||
| k1 | min | 5.96 | 6.8 | 7.8 | 8.5 | 9.6 | 10.3 | 11.7 | 12.8 | 14.4 | 15.5 | 17.2 | |||
| r | min | 0.6 | 0.6 | 0.6 | 0.8 | 0.8 | 0.8 | 1 | 1 | 1 | 1 | 1 | |||
| s | max=nominal size | 22 | 24 | 27 | 30 | 32 | 36 | 41 | 46 | 50 | 55 | 60 | |||
| Grade A | min | 21.67 | 23.67 | 26.67 | 29.67 | 31.61 | 35.38 | – | – | – | – | – | |||
| Grade B | min | – | 23.16 | 26.16 | 29.16 | 31 | 35 | 40 | 45 | 49 | 53.8 | 58.8 | |||
| Length of Thread b | – | – | – | – | – | – | – | – | – | – | – | ||||
