GB /T 5790 – 1986 – Bu lông liền long đen
Screw Thread | M5 | M6 | M8 | M10 | M12 | (M14) | M16 | M20 | ||
P | Pitch | 0.8 | 1 | 1.25 | 1.5 | 1.75 | 2 | 2 | 2.5 | |
b | L≤125 | 16 | 18 | 22 | 26 | 30 | 34 | 38 | 46 | |
125<L≤200 | / | / | 28 | 32 | 36 | 40 | 44 | 52 | ||
L>200 | / | / | / | / | / | / | 57 | 65 | ||
c | min | 1 | 1.1 | 1.2 | 1.5 | 1.8 | 2.1 | 2.4 | 3 | |
da | max | Type A | 5.7 | 6.8 | 9.2 | 11.2 | 13.7 | 15.7 | 17.7 | 22.4 |
Type B | 6.2 | 7.4 | 10 | 12.6 | 15.2 | 17.7 | 20.7 | 25.7 | ||
dc | max | 11.8 | 14.2 | 18 | 22.3 | 26.6 | 30.5 | 35 | 43 | |
ds | max | 5 | 6 | 8 | 10 | 12 | 14 | 16 | 20 | |
min | 4.82 | 5.82 | 7.78 | 9.78 | 11.73 | 13.73 | 15.73 | 19.67 | ||
du | max | 5.5 | 6.6 | 9 | 11 | 13.5 | 15.5 | 17.5 | 22 | |
dw | min | 9.8 | 12.2 | 15.8 | 19.6 | 23.8 | 27.6 | 31.9 | 39.9 | |
e | min | 8.56 | 10.8 | 14.08 | 16.32 | 19.68 | 22.58 | 25.94 | 32.66 | |
f | max | 1.4 | 2 | 2 | 2 | 3 | 3 | 3 | 4 | |
k | max | 5.4 | 6.6 | 8.1 | 9.2 | 10.4 | 12.4 | 14.1 | 17.7 | |
k1 | min | 2 | 2.5 | 3.2 | 3.6 | 4.6 | 5.5 | 6.2 | 7.9 | |
r1 | min | 0.25 | 0.4 | 0.4 | 0.4 | 0.6 | 0.6 | 0.6 | 0.8 | |
r2 | max | 0.3 | 0.4 | 0.5 | 0.6 | 0.7 | 0.9 | 1 | 1.2 | |
r3 | min | 0.1 | 0.1 | 0.15 | 0.2 | 0.25 | 0.3 | 0.35 | 0.4 | |
r4 | Ref. | 3 | 3.4 | 4.3 | 4.3 | 6.4 | 6.4 | 6.4 | 8.5 | |
s | max | 8 | 10 | 13 | 15 | 18 | 21 | 24 | 30 | |
min | 7.64 | 9.64 | 12.57 | 14.57 | 17.57 | 20.16 | 23.16 | 29.16 | ||
t | max | 0.15 | 0.2 | 0.25 | 0.3 | 0.35 | 0.45 | 0.5 | 0.65 | |
min | 0.05 | 0.05 | 0.1 | 0.15 | 0.15 | 0.2 | 0.25 | 0.3 | ||
Weight of per 1000 steel products(≈kg) | – | – | – | – | – | – | – | – |