BS 916 – 1953 – Bu lông đầu vuông
Screw Thread | 43922 | 42491 | 44046 | 42552 | 43862 | 42614 | 44048 | 43924 | 44050 | 1 | 39448 | 37987 | (1-3/8) | 37257 | (1-5/8) | |
PP | BSW | 20 | 18 | 16 | 14 | 12 | 12 | 11 | 10 | 9 | 8 | 7 | 7 | 6 | 6 | 5 |
s | max | 0.445 | 0.525 | 0.6 | 0.71 | 0.82 | 0.92 | 1.01 | 1.2 | 1.3 | 1.48 | 1.67 | 1.86 | 2.05 | 2.22 | 2.41 |
min | 0.435 | 0.515 | 0.585 | 0.695 | 0.8 | 0.9 | 0.985 | 1.175 | 1.27 | 1.45 | 1.64 | 1.815 | 2.005 | 2.175 | 2.365 | |
k | max | 0.186 | 0.228 | 0.27 | 0.312 | 0.363 | 0.405 | 0.447 | 0.53 | 0.623 | 0.706 | 0.79 | 0.89 | 0.98 | 1.06 | 1.18 |
min | 0.166 | 0.208 | 0.25 | 0.292 | 0.333 | 0.375 | 0.417 | 0.5 | 0.583 | 0.666 | 0.75 | 0.83 | 0.92 | 1 | 1.08 | |
b | min | 0.5 | 0.625 | 0.75 | 0.875 | 1 | 1.125 | 1.25 | 1.5 | 1.75 | 2 | 2.25 | 2.5 | 2.75 | 3 | 3.25 |
Screw Thread | 38047 | 2 | 37988 | 37258 | 38048 | 3 | (3-1/4) | 37259 | (3-3/4) | 4 | 37260 | 5 | 37261 | 6 | |
d | |||||||||||||||
PP | BSW | 5 | 4.5 | 4 | 4 | 3.5 | 3.5 | 3.25 | 3.25 | 3 | 3 | 2.875 | 2.75 | 2.625 | 2.5 |
s | max | 2.58 | 2.76 | 3.15 | 3.55 | 3.89 | 4.18 | 4.53 | 4.85 | 5.18 | 5.55 | 6.38 | 7.3 | 8.35 | 9.45 |
min | 2.52 | 2.7 | 3.09 | 3.49 | 3.83 | 4.08 | 4.43 | 4.75 | 5.08 | 5.45 | 6.255 | 7.175 | 8.225 | 9.325 | |
k | max | 1.27 | 1.43 | 1.6 | 1.77 | 1.93 | 2.15 | 2.32 | 2.48 | 2.65 | 2.82 | 3.2 | 3.53 | 3.87 | 4.2 |
min | 1.17 | 1.33 | 1.5 | 1.67 | 1.83 | 2 | 2.17 | 2.33 | 2.5 | 2.67 | 3 | 3.33 | 3.67 | 4 | |
b | min | 3.5 | 4 | 4.5 | 5 | 5.5 | 6 | 6.5 | 7 | 7.5 | 8 | 9 | 10 | 11 | 12 |