GB /T 5788 – 1986 – Bu lông liền long đen
Screw Thread | M5 | M6 | M8 | M10 | M12 | (M14) | M16 | ||
P | Pitch | 0.8 | 1 | 1.25 | 1.5 | 1.75 | 2 | 2 | |
b | L≤125 | 16 | 18 | 22 | 26 | 30 | 34 | 38 | |
125<L≤200 | – | – | 28 | 32 | 36 | 40 | 44 | ||
L>200 | – | – | – | – | – | – | 57 | ||
c | min | 1 | 1.1 | 1.2 | 1.5 | 1.8 | 2.1 | 2.4 | |
da | Type A | max | 5.7 | 6.8 | 9.2 | 11.2 | 13.7 | 15.7 | 17.7 |
Type B | max | 6.2 | 7.4 | 10 | 12.6 | 15.2 | 17.7 | 20.7 | |
dc | max | 11.4 | 13.6 | 17 | 20.8 | 24.7 | 28.6 | 32.8 | |
ds | max | 5 | 6 | 8 | 10 | 12 | 14 | 16 | |
min | 4.82 | 5.82 | 7.78 | 9.78 | 11.73 | 13.73 | 15.73 | ||
du | max | 5.5 | 6.6 | 9 | 11 | 13.5 | 15.5 | 17.5 | |
dw | min | 9.4 | 11.6 | 14.9 | 18.7 | 22.6 | 26.4 | 30.6 | |
e | min | 7.44 | 8.56 | 10.8 | 14.08 | 16.32 | 19.68 | 22.94 | |
f | max | 1.4 | 2 | 2 | 2 | 3 | 3 | 3 | |
k | max | 5.6 | 6.8 | 8.5 | 9.7 | 11.9 | 12.9 | 15.1 | |
k1 | min | 2.3 | 2.9 | 3.8 | 4.3 | 5.4 | 5.6 | 6.7 | |
r1 | min | 0.2 | 0.25 | 0.4 | 0.4 | 0.6 | 0.6 | 0.6 | |
r2 | max | 0.3 | 0.4 | 0.5 | 0.6 | 0.7 | 0.9 | 1 | |
r3 | min | 0.1 | 0.1 | 0.15 | 0.2 | 0.25 | 0.3 | 0.35 | |
r4 | Ref. | 3 | 3.4 | 4.3 | 4.3 | 6.4 | 6.4 | 6.4 | |
s | max | 7 | 8 | 10 | 13 | 15 | 18 | 21 | |
min | 6.64 | 7.64 | 9.64 | 12.57 | 14.57 | 17.57 | 20.48 | ||
t | max | 0.15 | 0.2 | 0.25 | 0.3 | 0.35 | 0.45 | 0.5 | |
min | 0.05 | 0.05 | 0.1 | 0.15 | 0.15 | 0.2 | 0.25 | ||
Length of Thread b | – | – | – | – | – | – | – |