JIS B 1182 – 1995 – Bu lông đầu vuông
Screw Thread | M10 | M12 | M16 | M20 | (M22) | M24 | |
P | Pitch | 1.5 | 1.75 | 2 | 2.5 | 2.5 | 3 |
ds | Nominal Size | 10 | 12 | 16 | 20 | 22 | 24 |
max | 10.7 | 12.9 | 16.9 | 20.95 | 22.95 | 24.95 | |
min | 9.8 | 11.8 | 15.8 | 19.65 | 21.65 | 23.65 | |
k | Nominal Size | 7 | 8 | 10 | 13 | 14 | 15 |
max | 7.6 | 8.8 | 10.8 | 13.9 | 14.9 | 15.9 | |
min | 6.4 | 7.2 | 9.2 | 12.1 | 13.1 | 14.1 | |
s | max=nominal size | 24 | 30 | 36 | 41 | 46 | 55 |
min | 23.2 | 29.2 | 35 | 40 | 45 | 53.8 |