GB /T 32076.3 – 2015 – Bu lông kết cấu
Thread Size | M12 | (M14) | M16 | (M18) | M20 | (M22) | M24 | (M27) | M30 | M36 | |
P | Pitch | 1.75 | 2 | 2 | 2.5 | 2.5 | 2.5 | 3 | 3 | 3.5 | 4 |
b | L≤125 | 30 | 34 | 38 | 42 | 46 | 50 | 54 | 60 | 66 | 78 |
125<L≤200 | – | 40 | 44 | 48 | 52 | 56 | 60 | 66 | 72 | 84 | |
c | max | 0.8 | 0.8 | 0.8 | 0.8 | 0.8 | 0.8 | 0.8 | 0.8 | 0.8 | 0.8 |
min | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 | |
da | max | 15.2 | 17.2 | 19.2 | 21.7 | 24.4 | 26.4 | 28.4 | 32.4 | 35.4 | 42.4 |
ds | max | 12.7 | 14.7 | 16.7 | 18.7 | 20.84 | 22.84 | 24.84 | 27.84 | 30.84 | 37 |
min | 11.3 | 13.3 | 15.3 | 17.3 | 19.16 | 21.16 | 23.16 | 26.16 | 29.16 | 35 | |
dw | min | 20.1 | 22.0 | 24.9 | 27.7 | 29.5 | 33.3 | 38.0 | 42.8 | 46.6 | 55.9 |
e | min | 23.91 | 26.17 | 29.56 | 32.95 | 35.03 | 39.55 | 45.2 | 50.85 | 55.37 | 66.44 |
k | Nominal Size | 7.5 | 8.8 | 10 | 11.5 | 12.5 | 14 | 15 | 17 | 18.7 | 22.5 |
max | 7.95 | 9.25 | 10.75 | 12.4 | 13.4 | 14.9 | 15.9 | 17.9 | 19.75 | 23.55 | |
min | 7.05 | 8.35 | 9.25 | 10.6 | 11.6 | 13.1 | 14.1 | 16.1 | 17.65 | 21.45 | |
k1 | min | 4.90 | 5.85 | 6.50 | 7.42 | 8.10 | 9.2 | 9.9 | 11.3 | 12.4 | 15.0 |
r | min | 1.2 | 1.2 | 1.2 | 1.5 | 1.5 | 1.5 | 1.5 | 2.0 | 2.0 | 2.0 |
s | max | 22 | 24 | 27 | 30 | 32 | 36 | 41 | 46 | 50 | 60 |
min | 21.16 | 23.16 | 26.16 | 29.16 | 31 | 35 | 40 | 45 | 49 | 58.8 | |
Length of Thread b | – | – | – | – | – | – | – | – | – | – |