GB 5783 – 1986 – Bu lông lục giác
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GB 5783 – 1986 – Bu lông lục giác
| Thread Size | M3 | M4 | M5 | M6 | M8 | M10 | M12 | (M14) | M16 | (M18) | M20 | (M22) | M24 | |||
| a | max | 1.5 | 2.1 | 2.4 | 3 | 3.75 | 4.5 | 5.25 | 6 | 6 | 7.5 | 7.5 | 7.5 | 9 | ||
| min | – | – | – | – | – | – | – | 2 | – | 2.5 | – | 2.5 | – | |||
| c | max | 0.4 | 0.4 | 0.5 | 0.5 | 0.6 | 0.6 | 0.6 | 0.6 | 0.8 | 0.8 | 0.8 | 0.8 | 0.8 | ||
| min | 0.15 | 0.15 | 0.15 | 0.15 | 0.15 | 0.15 | 0.15 | 0.15 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | |||
| da | max | 3.6 | 4.7 | 5.7 | 6.8 | 9.2 | 11.2 | 13.7 | 15.7 | 17.7 | 20.2 | 22.4 | 24.4 | 26.4 | ||
| dw | Grade A | min | 4.6 | 5.9 | 6.9 | 8.9 | 11.6 | 14.6 | 16.6 | 19.6 | 22.5 | 25.3 | 28.2 | 31.7 | 33.6 | |
| Grade B | min | – | – | 6.7 | 8.7 | 11.4 | 14.4 | 16.4 | 19.2 | 22 | 24.8 | 27.7 | 31.4 | 33.2 | ||
| e | Grade A | min | 6.07 | 7.66 | 8.79 | 11.05 | 14.38 | 17.77 | 20.03 | 23.35 | 26.75 | 30.14 | 33.53 | 37.72 | 39.98 | |
| Grade B | min | – | – | 8.63 | 10.89 | 14.2 | 17.59 | 19.85 | 22.78 | 26.17 | 29.56 | 32.95 | 37.29 | 39.55 | ||
| k | Nominal Size | 2 | 2.8 | 3.5 | 4 | 5.3 | 6.4 | 7.5 | 8.8 | 10 | 11.5 | 12.5 | 14 | 15 | ||
| Grade A | min | 1.88 | 2.68 | 3.35 | 3.85 | 5.15 | 6.22 | 7.32 | 8.62 | 9.82 | 11.28 | 12.28 | 13.78 | 14.78 | ||
| max | 2.12 | 2.92 | 3.65 | 4.15 | 5.45 | 6.58 | 7.68 | 8.98 | 10.18 | 11.72 | 12.72 | 14.22 | 15.22 | |||
| Grade B | min | – | – | 3.26 | 3.76 | 5.06 | 6.11 | 7.21 | 8.51 | 9.71 | 11.15 | 12.15 | 13.65 | 14.65 | ||
| max | – | – | 3.74 | 4.24 | 5.54 | 6.69 | 7.79 | 9.09 | 10.29 | 11.85 | 12.85 | 14.35 | 15.35 | |||
| k1 | Grade A | min | 1.3 | 1.9 | 2.35 | 2.7 | 3.6 | 4.35 | 5.12 | 6 | 6.9 | 7.9 | 8.6 | 9.6 | 10.35 | |
| Grade B | min | – | – | 2.28 | 2.63 | 3.54 | 4.28 | 5.05 | 6 | 6.8 | 7.8 | 8.5 | 9.5 | 10.3 | ||
| r | min | 0.1 | 0.2 | 0.2 | 0.25 | 0.4 | 0.4 | 0.6 | 0.6 | 0.6 | 0.6 | 0.8 | 1 | 0.8 | ||
| s | max=nominal size | 5.5 | 7 | 8 | 10 | 13 | 16 | 18 | 21 | 24 | 27 | 30 | 34 | 36 | ||
| Grade A | min | 5.32 | 6.78 | 7.78 | 9.78 | 12.73 | 15.73 | 17.73 | 20.67 | 23.67 | 26.67 | 29.67 | 33.38 | 35.38 | ||
| Grade B | min | – | – | 7.64 | 9.64 | 12.57 | 15.57 | 17.57 | 20.16 | 23.16 | 26.76 | 29.16 | 33 | 35 | ||
| Thread Size | (M27) | M30 | (M33) | M36 | (M39) | M42 | (M45) | M48 | (M52) | M56 | (M60) | M64 | |||
| a | max | 9 | 10.5 | 10.5 | 12 | 12 | 13.5 | 13.5 | 15 | 15 | 16.5 | 16.5 | 18 | ||
| min | 3 | – | 3.5 | – | 4 | 4.5 | 4.5 | 5 | 5 | 5.5 | 5.5 | 6 | |||
| c | max | 0.8 | 0.8 | 0.8 | 0.8 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | ||
| min | 0.2 | 0.2 | 0.2 | 0.2 | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 | |||
| da | max | 30.4 | 33.4 | 36.4 | 39.4 | 42.4 | 48.6 | 48.6 | 56.6 | 56.6 | 67 | 67 | 75 | ||
| dw | Grade A | min | – | – | – | – | – | – | – | – | – | – | – | – | |
| Grade B | min | 38 | 42.7 | 46.6 | 51.1 | 55.9 | 60.6 | 64.7 | 69.4 | 74.2 | 78.7 | 83.41 | 88.2 | ||
| e | Grade A | min | – | – | – | – | – | – | – | – | – | – | – | – | |
| Grade B | min | 45.2 | 50.85 | 55.37 | 60.79 | 66.44 | 72.02 | 76.95 | 82.6 | 88.25 | 93.56 | 99.21 | 104.86 | ||
| k | Nominal Size | 17 | 18.7 | 21 | 22.5 | 25 | 26 | 28 | 30 | 33 | 35 | 38 | 40 | ||
| Grade A | min | – | – | – | – | – | – | – | – | – | – | – | – | ||
| max | – | – | – | – | – | – | – | – | – | – | – | – | |||
| Grade B | min | 16.65 | 18.28 | 20.58 | 22.08 | 24.58 | 24.75 | 27.58 | 28.95 | 32.5 | 33.75 | 37.5 | 38.75 | ||
| max | 17.35 | 19.12 | 21.42 | 22.92 | 25.42 | 27.05 | 28.42 | 31.05 | 33.5 | 36.25 | 38.5 | 41.25 | |||
| k1 | Grade A | min | – | – | – | – | – | – | – | – | – | – | – | – | |
| Grade B | min | 11.7 | 12.8 | 14.4 | 15.5 | 17.2 | 17.5 | 19.3 | 20.1 | 22.8 | 23.6 | 26.2 | 27.1 | ||
| r | min | 1 | 1 | 1 | 1 | 1 | 1.2 | 1.2 | 1.6 | 1.6 | 2 | 2 | 2 | ||
| s | max=nominal size | 41 | 46 | 50 | 55 | 60 | 65 | 70 | 75 | 80 | 85 | 90 | 95 | ||
| Grade A | min | – | – | – | – | – | – | – | – | – | – | – | – | ||
| Grade B | min | 40 | 45 | 49 | 53.8 | 58.8 | 63.8 | 68.1 | 73.1 | 78.1 | 82.8 | 87.8 | 92.8 | ||
