GB /T 9125 – 2003 – Bu lông kết cấu
Thread Size | M10 | M12 | M14 | M16 | M20 | M24 | M27 | M30 | M33 | |||
P | Pitch | Coarse thread | 1.5 | 1.75 | 2 | 2 | 2.5 | 3 | 3 | 3.5 | 3.5 | |
Fine thread | 1.25 | 1.5 | 1.5 | 1.5 | 2 | 2 | 2 | 2 | 2 | |||
very fine thread | 1 | 1.25 | – | – | 1.5 | – | – | – | – | |||
b | L≤125 | 26 | 30 | 34 | 38 | 46 | 54 | 60 | 66 | – | ||
125<L≤200 | 32 | 36 | 40 | 44 | 52 | 60 | 66 | 72 | 78 | |||
L>200 | 45 | 49 | 53 | 57 | 65 | 73 | 79 | 85 | 91 | |||
ds | max=nominal size | 10 | 12 | 14 | 16 | 20 | 24 | 27 | 30 | 33 | ||
min | Grade A | 9.78 | 11.73 | 13.73 | 15.73 | 19.67 | 23.67 | – | – | – | ||
Grade B | 9.64 | 11.57 | 13.57 | 15.57 | 19.48 | 23.48 | 26.48 | 29.48 | 32.38 | |||
e | min | Grade A | 17.77 | 20.03 | 23.36 | 26.75 | 33.53 | 39.98 | – | – | – | |
Grade B | 17.59 | 19.85 | 22.78 | 26.17 | 32.95 | 39.55 | 45.2 | 50.85 | 55.37 | |||
k | Nominal Size | 6.4 | 7.5 | 8.8 | 10 | 12.5 | 15 | 17 | 18.7 | 21 | ||
Grade A | max | 6.58 | 7.68 | 8.98 | 10.18 | 12.715 | 15.215 | – | – | – | ||
min | 6.22 | 7.32 | 8.62 | 9.82 | 12.285 | 14.785 | – | – | – | |||
Grade B | max | 6.69 | 7.79 | 9.09 | 10.29 | 12.85 | 15.35 | 17.35 | 19.12 | 21.42 | ||
min | 6.11 | 7.21 | 8.51 | 9.71 | 12.15 | 14.65 | 16.65 | 18.28 | 20.58 | |||
s | max=nominal size | 16 | 18 | 21 | 24 | 30 | 36 | 41 | 46 | 50 | ||
min | Grade A | 15.73 | 17.73 | 20.67 | 23.67 | 29.67 | 35.38 | – | – | – | ||
Grade B | 15.57 | 17.57 | 20.16 | 23.16 | 29.16 | 35 | 40 | 45 | 49 |