GB /T 16674.2 – 2016 – Bu lông liền long đen
| Thread Size | M8 | M10 | M12 | (M14) | M16 | |||
| P | Fine thread | 1 | 1 | 1.25 | 1.5 | 1.5 | ||
| Fine thread | – | 1.25 | 1.5 | – | – | |||
| a | max | 3 | 3 | 4.5 | 4.5 | 4.5 | ||
| min | 1 | 1 | 1.5 | 1.5 | 1.5 | |||
| b | L≤125 | 22 | 26 | 30 | 34 | 38 | ||
| 125＜L≤200 | 28 | 32 | 36 | 40 | 44 | |||
| L＞200 | / | / | / | / | 57 | |||
| c | min | 1.2 | 1.5 | 1.8 | 2.1 | 2.4 | ||
| da | Type F | max | 9.2 | 11.2 | 13.7 | 15.7 | 17.7 | |
| Type U | max | 10 | 12.5 | 15.2 | 17.7 | 20.5 | ||
| dc | max | 17 | 20.8 | 24.7 | 28.6 | 32.8 | ||
| ds | max | 8 | 10 | 12 | 14 | 16 | ||
| min | 7.78 | 9.78 | 11.73 | 13.73 | 15.73 | |||
| du | max | 8.8 | 10.8 | 12.8 | 14.8 | 17.2 | ||
| dw | min | 14.9 | 18.7 | 22.5 | 26.4 | 30.6 | ||
| e | min | 10.95 | 14.26 | 16.5 | 19.86 | 23.15 | ||
| k | max | 8.5 | 9.7 | 12.1 | 12.9 | 15.2 | ||
| k1 | min | 3.8 | 4.3 | 5.4 | 5.6 | 6.8 | ||
| f | max | 2.1 | 2.1 | 2.1 | 2.1 | 3.2 | ||
| r1 | min | 0.4 | 0.4 | 0.6 | 0.6 | 0.6 | ||
| r2 | max | 0.5 | 0.6 | 0.7 | 0.9 | 1 | ||
| r3 | max | 0.36 | 0.45 | 0.54 | 0.63 | 0.72 | ||
| min | 0.16 | 0.2 | 0.24 | 0.28 | 0.32 | |||
| r4 | Ref. | 5.7 | 5.7 | 5.7 | 5.7 | 8.8 | ||
| s | max | 10 | 13 | 15 | 18 | 21 | ||
| min | 9.78 | 12.73 | 14.73 | 17.73 | 20.67 | |||
| V | max | 0.25 | 0.3 | 0.35 | 0.45 | 0.5 | ||
| min | 0.1 | 0.15 | 0.15 | 0.2 | 0.25 | |||
| Weight of per 1000 steel products(≈kg) | – | – | – | – | – | |||
| Length of Thread b | – | – | – | – | – | |||
