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Heavy Hex Screws

ASME B 18.2.1 - 1996

Display drawing:

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