GB /T 16939 – 2016 – Bu lông kết cấu
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M12 | M14 | M16 | M20 | M24 | M27 | M30 | M36 | M39 | M42 | |
P | Pitch | 1.75 | 2 | 2 | 2.5 | 3 | 3 | 3.5 | 4 | 4 | 4.5 |
b | min | 15 | 17 | 20 | 25 | 30 | 33 | 37 | 44 | 47 | 50 |
max | 18.5 | 21 | 24 | 30 | 36 | 39 | 44 | 52 | 55 | 59 | |
dk | max | 18 | 21 | 24 | 30 | 36 | 41 | 46 | 55 | 60 | 65 |
min | 17.38 | 20.38 | 23.48 | 29..48 | 35.38 | 40.38 | 45.38 | 54.26 | 59.26 | 64.26 | |
ds | max | 12.35 | 14.35 | 16.35 | 20.42 | 24.42 | 27.42 | 30.42 | 36.5 | 39.5 | 42.5 |
min | 11.65 | 13.65 | 15.65 | 19.58 | 23.58 | 26.58 | 29.58 | 35.5 | 38.5 | 41.5 | |
k | Nominal Size | 6.4 | 7.5 | 10 | 12.5 | 15 | 17 | 18.7 | 22.5 | 25 | 26 |
max | 7.15 | 8.25 | 10.75 | 13.4 | 15.9 | 17.9 | 19.75 | 23.55 | 26.05 | 27.05 | |
min | 5.65 | 6.75 | 9.25 | 11.6 | 14.1 | 16.1 | 17.65 | 21.45 | 23.95 | 24.95 | |
L | Nominal Size | 50 | 54 | 62 | 73 | 82 | 90 | 98 | 125 | 128 | 136 |
max | 50.8 | 54.95 | 62.95 | 73.95 | 83.1 | 91.1 | 99.1 | 126.25 | 129.25 | 137.25 | |
min | 49.2 | 53.05 | 61.05 | 72.05 | 80.9 | 88.9 | 96.9 | 123.75 | 126.75 | 134.75 | |
L1 | Nominal Size | 18 | 18 | 22 | 24 | 24 | 28 | 28 | 43 | 43 | 43 |
max | 18.35 | 18.35 | 22.42 | 24.42 | 24.42 | 28.42 | 28.42 | 43.50 | 43.50 | 43.50 | |
min | 17.65 | 17.65 | 21.58 | 23.58 | 23.58 | 27.58 | 27.58 | 42.50 | 42.50 | 42.50 | |
L2 | ≈ | 10 | 10 | 13 | 16 | 18 | 20 | 24 | 26 | 26 | 30 |
L3 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | |
n | max | 3.3 | 3.3 | 3.3 | 5.3 | 5.3 | 6.3 | 6.3 | 8.36 | 8.36 | 8.36 |
min | 3 | 3 | 3 | 5 | 5 | 6 | 6 | 8 | 8 | 8 | |
t1 | max | 2.8 | 2.8 | 2.8 | 3.3 | 3.3 | 4.38 | 4.38 | 5.38 | 5.38 | 5.38 |
min | 2.2 | 2.2 | 2.2 | 2.7 | 2.7 | 3.62 | 3.62 | 4.62 | 4.62 | 4.62 | |
t2 | max | 2.3 | 2.3 | 2.3 | 2.8 | 2.8 | 3.3 | 3.3 | 4.38 | 4.38 | 4.38 |
min | 1.7 | 1.7 | 1.7 | 2.2 | 2.2 | 2.7 | 2.7 | 3.62 | 3.62 | 3.62 | |
per 1000 units ≈ kg | 51.39 | 77.82 | 122.8 | 229.6 | 381 | 542.2 | 736.4 | 1330 | 1655 | 2034 |
Screw Thread | M45 | M48 | M56 | M60 | M64 | M68 | M72 | M76 | M80 | M85 | |
P | Pitch | 4.5 | 5 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 |
b | min | 55 | 58 | 66 | 70 | 74 | 78 | 83 | 87 | 92 | 98 |
max | 64 | 68 | 74 | 78 | 82 | 86 | 91 | 95 | 100 | 106 | |
dk | max | 70 | 75 | 90 | 95 | 100 | 100 | 105 | 110 | 125 | 125 |
min | 69.26 | 74.26 | 89.13 | 94.13 | 99.13 | 99.13 | 104.13 | 109.13 | 124 | 124 | |
ds | max | 45.5 | 48.5 | 56.6 | 60.6 | 64.6 | 68.68 | 72.72 | 76.76 | 80.8 | 85.85 |
min | 44.5 | 47.5 | 55.86 | 59.86 | 63.86 | 67.94 | 71.98 | 76.02 | 80.06 | 84.98 | |
k | Nominal Size | 28 | 30 | 35 | 38 | 40 | 45 | 45 | 50 | 56 | 55 |
max | 29.05 | 31.05 | 36.25 | 39.25 | 41.25 | 46.39 | 46.39 | 51.55 | 56.71 | 56.71 | |
min | 26.95 | 28.95 | 33.75 | 36.75 | 38.75 | 43.56 | 43.56 | 48.4 | 53.24 | 53.24 | |
L | Nominal Size | 145 | 148 | 172 | 196 | 205 | 215 | 230 | 240 | 245 | 265 |
max | 146.25 | 149.25 | 173.25 | 197.45 | 206.45 | 217.3 | 232.2 | 242.3 | 247.3 | 267.6 | |
min | 143.75 | 146.75 | 170.75 | 194.55 | 203.55 | 212.3 | 227.7 | 237.7 | 242.7 | 262.4 | |
L1 | Nominal Size | 48 | 48 | 53 | 53 | 58 | 58 | 63 | 63 | 63 | 68 |
max | 48.50 | 48.50 | 53.60 | 53.60 | 58.60 | 58.6 | 63.6 | 63.6 | 63.6 | 68.6 | |
min | 47.50 | 47.50 | 52.40 | 52.40 | 57.40 | 57.4 | 62.4 | 62.4 | 62.4 | 67.4 | |
L2 | ≈ | 30 | 30 | 42 | 57 | 57 | 65 | 70 | 75 | 80 | 85 |
L3 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | |
n | max | 8.36 | 8.36 | 8.36 | 8.36 | 8.36 | 8.36 | 8.36 | 8.36 | 8.36 | 8.36 |
min | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | |
t1 | max | 5.38 | 5.38 | 5.38 | 5.38 | 5.38 | 5.38 | 5.38 | 5.38 | 5.38 | 5.38 |
min | 4.62 | 4.62 | 4.62 | 4.62 | 4.62 | 4.62 | 4.62 | 4.62 | 4.62 | 4.62 | |
t2 | max | 4.38 | 4.38 | 4.38 | 4.38 | 4.38 | 4.38 | 4.38 | 4.38 | 4.38 | 4.38 |
min | 3.62 | 3.62 | 3.62 | 3.62 | 3.62 | 3.62 | 3.62 | 3.62 | 3.62 | 3.62 | |
per 1000 units ≈ kg | 2515 | 2975 | 4863 | 6217 | 7368 | – | – | – | – | – |