ANSI/ASME B 18.2.1 – 2012 – Bu lông đầu vuông
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43922 | 42491 | 44046 | 42552 | 43862 | 44048 | 43924 | 44050 | 1 | 39448 | 37987 | 39508 | 37257 | |
d | 0.2500 | 0.3125 | 0.3750 | 0.4375 | 0.5000 | 0.6250 | 0.7500 | 0.8750 | 10.000 | 11.250 | 12.500 | 13.750 | 15.000 | |
PP | UNC | 20 | 18 | 16 | 14 | 13 | 11 | 10 | 9 | 8 | 7 | 7 | 6 | 6 |
ds | max | 0.260 | 0.324 | 0.388 | 0.452 | 0.515 | 0.642 | 0.768 | 0.895 | 1.022 | 1.149 | 1.277 | 1.404 | 1.531 |
min | 0.237 | 0.298 | 0.36 | 0.421 | 0.482 | 0.605 | 0.729 | 0.852 | 0.976 | 1.098 | 1.223 | 1.345 | 1.47 | |
s | max | 0.375 | 0.500 | 0.562 | 0.625 | 0.750 | 0.938 | 1.125 | 1.312 | 1.500 | 1.688 | 1.875 | 2.062 | 2.250 |
min | 0.362 | 0.484 | 0.544 | 0.603 | 0.725 | 0.906 | 1.088 | 1.269 | 1.450 | 1.631 | 1.812 | 1.944 | 2.175 | |
k | max | 0.188 | 0.220 | 0.268 | 0.316 | 0.348 | 0.444 | 0.524 | 0.620 | 0.684 | 0.780 | 0.876 | 0.940 | 1.036 |
min | 0.156 | 0.186 | 0.232 | 0.278 | 0.308 | 0.400 | 0.476 | 0.568 | 0.628 | 0.720 | 0.812 | 0.872 | 0.964 | |
b | L≤6 | 0.750 | 0.875 | 1.000 | 1.125 | 1.250 | 1.500 | 1.750 | 2.000 | 2.250 | 2.500 | 2.750 | 3.000 | 3.250 |
L>6 | 1.000 | 1.125 | 1.250 | 1.375 | 1.500 | 1.750 | 2.000 | 2.250 | 2.500 | 2.750 | 3.000 | 3.250 | 3.500 |