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Heavy Hex Screws

ASME B 18.2.1 - 1996

Display drawing:

Screw Thread 1/2 5/8 3/4 7/8 1 1-1/8 1-1/4 1-3/8 1-1/2 2 2-1/4 2-1/2 2-3/4 3 1-3/4
Nominal Diameter 1/2 5/8 3/4 7/8 1 1-1/8 1-1/4 1-3/8 1-1/2 2 2-1/4 2-1/2 2-3/4 3 1-3/4
P 20 18 16 14 12 12 12 12 12 4.5 4 4 4 4 5
Ds Max 0.5 0.625 0.75 0.875 1 1.125 1.25 1.375 1.5 2 2.25 2.5 2.75 3 1.75
Ds Min 0.482 0.605 0.729 0.852 0.976 1.098 1.223 1.345 1.47 1.964 2.214 2.461 2.711 2.961 1.716
S Max 0.875 1.062 1.25 1.438 1.625 1.812 2 2.188 2.375 3.125 3.5 3.875 4.25 4.625 2.75
S Min 0.85 1.031 1.212 1.394 1.575 1.756 1.938 2.119 2.3 3.025 3.388 3.75 4.112 4.475 2.662
E Max 1.01 1.227 1.443 1.66 1.876 2.093 2.309 2.526 2.742 3.608 4.041 4.474 4.907 5.34 3.175
E Min 0.969 1.175 1.383 1.589 1.796 2.002 2.209 2.416 2.622 3.449 3.862 4.275 4.688 5.102 3.035
K Max 0.323 0.403 0.483 0.563 0.627 0.718 0.813 0.878 0.974 1.263 1.423 1.583 1.744 1.935 1.134
K Min 0.302 0.378 0.455 0.531 0.591 0.658 0.749 0.81 0.902 1.175 1.327 1.479 1.632 1.815 1.054
Kw Min 0.215 0.269 0.324 0.378 0.416 0.461 0.53 0.569 0.64 0.825 0.933 1.042 1.151 1.290 0.748
B L≤6 1.25 1.5 1.75 2 2.25 2.5 2.75 3 3.25 4.25 None None None None 3.75
B L＞6 1.5 1.75 2 2.25 2.5 2.75 3 3.25 3.5 4.5 5 5.5 6 6.5 4
R Max 0.025 0.045 0.045 0.065 0.095 0.095 0.095 0.095 0.095 0.095 0.095 0.095 0.095 0.095 0.095
R Min 0.015 0.02 0.02 0.04 0.06 0.06 0.06 0.06 0.06 0.06 0.060 0.060 0.060 0.060 0.06