JIS B 1182 – 1995 – Bu lông đầu vuông
Screw Thread | M3 | M4 | M5 | M6 | M8 | M10 | M12 | (M14) | M16 | (M18) | M20 | (M22) | M24 | |
P | Pitch | 0.5 | 0.7 | 0.8 | 1 | 1.25 | 1.5 | 1.75 | 2 | 2 | 2.5 | 2.5 | 2.5 | 3 |
ds | max=nominal size | 3 | 4 | 5 | 6 | 8 | 10 | 12 | 14 | 16 | 18 | 20 | 22 | 24 |
min | 2.9 | 3.9 | 4.9 | 5.9 | 7.85 | 9.85 | 11.8 | 13.8 | 15.8 | 17.8 | 19.8 | 21.8 | 23.8 | |
k | Nominal Size | 2 | 2.8 | 3.5 | 4 | 5.5 | 7 | 8 | 9 | 10 | 12 | 13 | 14 | 15 |
max | 2.1 | 2.9 | 3.65 | 4.15 | 5.65 | 7.2 | 8.2 | 9.2 | 10.2 | 12.2 | 13.2 | 14.2 | 15.2 | |
min | 1.9 | 2.7 | 3.35 | 3.85 | 5.35 | 6.8 | 7.8 | 8.8 | 9.8 | 11.8 | 12.8 | 13.8 | 14.8 | |
s | max=nominal size | 5.5 | 7 | 8 | 10 | 13 | 17 | 19 | 22 | 24 | 27 | 30 | 32 | 36 |
min | 5.3 | 6.8 | 7.8 | 9.8 | 12.75 | 16.75 | 18.65 | 21.65 | 23.65 | 26.65 | 29.65 | 31.6 | 35.6 |