ANSI / ASME B 18.2.1 – 2012 – Bu lông đầu vuông
Screw Thread | 44046 | 43862 | 44048 | 43924 | 44050 | 1 | |
d | 0.3750 | 0.5000 | 0.6250 | 0.7500 | 0.8750 | 10.000 | |
PP | UNC | 16 | 13 | 11 | 10 | 9 | 8 |
ds | max | 0.388 | 0.515 | 0.642 | 0.768 | 0.895 | 1.022 |
min | 0.36 | 0.482 | 0.605 | 0.729 | 0.852 | 0.976 | |
s | max | 0.562 | 0.75 | 0.938 | 1.125 | 1.312 | 1.5 |
min | 0.544 | 0.725 | 0.906 | 1.088 | 1.269 | 1.45 | |
k | max | 0.317 | 0.411 | 0.52 | 0.614 | 0.723 | 0.801 |
min | 0.277 | 0.371 | 0.48 | 0.574 | 0.683 | 0.761 | |
k1 | 0.25 | 0.328 | 0.422 | 0.5 | 0.594 | 0.656 | |
b | L≤6 | 1 | 1.25 | 1.5 | 1.75 | 2 | 2.25 |
L>6 | 1.25 | 1.5 | 1.75 | 2 | 2.25 | 2.5 |