ISO 7412 – 1984 – Bu lông kết cấu
Screw Thread | M12 | M16 | M20 | (M22) | M24 | (M27) | M30 | M36 | |
P | Pitch | 1.75 | 2.0 | 2.5 | 2.5 | 3 | 3 | 3.5 | 4 |
b | L≤100 | 25 | 31 | 36 | 38 | 41 | 44 | 49 | 56 |
100<L | 32 | 38 | 43 | 45 | 48 | 51 | 56 | 63 | |
ds | max | 12.70 | 16.70 | 20.84 | 22.84 | 24.84 | 27.84 | 30.84 | 37.00 |
min | 11.30 | 15.30 | 19.16 | 21.16 | 23.16 | 26.16 | 29.16 | 35.00 | |
k | max | 7.95 | 10.75 | 13.40 | 14.90 | 15.90 | 17.90 | 19.75 | 23.55 |
min | 7.05 | 9.25 | 11.60 | 13.10 | 14.10 | 16.10 | 17.65 | 21.45 | |
s | max | 21 | 27 | 34 | 36 | 41 | 46 | 50 | 60 |
min | 20.16 | 26.16 | 33 | 35 | 40 | 45 | 49 | 58.8 |