GB /T 32076.7 – 2015 – Bu lông kết cấu
Screw Thread | (M39) | M42 | (M45) | M48 | (M52) | M56 | M64 | |
P | Pitch | 4 | 4.5 | 4.5 | 5 | 5 | 5.5 | 6 |
b | Ref. | 68 | 74 | 76 | 82 | 85 | 90 | 100 |
c | min | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 |
max | 1 | 1 | 1 | 1 | 1 | 1 | 1 | |
da | max | 45.0 | 48.0 | 52.0 | 55.0 | 60.0 | 64.2 | 73.2 |
ds | Nominal Size | 39 | 42 | 45 | 48 | 52 | 56 | 64 |
max | 40 | 43 | 46 | 49 | 53 | 57.2 | 65.2 | |
min | 38 | 41 | 44 | 47 | 51 | 54.8 | 62.8 | |
dw | min | 60.00 | 64.70 | 69.45 | 74.20 | 78.80 | 83.40 | 92.90 |
e | min | 71.3 | 76.95 | 82.6 | 88.25 | 93.79 | 99.2 | 110.5 |
k | Nominal Size | 25 | 26 | 28 | 30 | 33 | 35 | 40 |
max | 26.05 | 27.05 | 29.05 | 31.05 | 34.25 | 36.25 | 41.25 | |
min | 23.95 | 24.95 | 26.95 | 28.95 | 31.75 | 33.75 | 38.75 | |
k1 | min | 16.76 | 17.46 | 18.86 | 20.26 | 22.23 | 23.63 | 27.13 |
r | min | 2.5 | 2.5 | 3.0 | 3.0 | 3.5 | 3.5 | 4.0 |
s | max=nominal size | 65 | 70 | 70 | 80 | 85 | 90 | 100 |
min | 63.1 | 68.1 | 73.1 | 78.1 | 83 | 87.8 | 97.8 | |
Length of Thread b | – | – | – | – | – | – | – |