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Heavy Hex Screws

ASME B 18.2.1 - 1996

Display drawing:

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