SOCKET HEAD SHOULDER SCREWS
ANSI/ASME B18.3 1986
All Dimensions in Inches
Basic
Shoulder Dia.		 Basic
Thread Dia.		 Shoulder Dia. Head Dia. Head Height Head Side Height Hex Socket Size Key Engage-
ment
Max. Min. Max. Min. Max. Min. Min. Nom.
1/4 10/24 0.2480 0.2460 0.375 0.357 0.188 0.177 0.157 0.125 0.094
5/16 1/4-20 0.3105 0.3085 0.438 0.419 0.219 0.209 0.183 0.156 0.117
3/8 5/16-18 0.3730 0.3710 0.562 0.543 0.250 0.240 0.209 0.188 0.141
1/2 3/8-16 0.4980 0.4960 0.750 0.729 0.312 0.302 0.262 0.250 0.188
5/8 1/2-13 0.6230 0.6210 0.875 0.853 0.375 0.365 0.315 0.312 0.234
3/4 5/8-11 0.7480 0.7460 1.000 0977 0.500 0.490 0.421 0.375 0.281
1 3/4-10 0.9980 0.9960 1.312 1.287 0.625 0.610 0.527 0.500 0.375
1-1/4 7/8-9 1.2480 1.2460 1.750 1.723 0.750 0.735 0.633 0.625 0.469
1-1/2 1-1/8-7 1.4980 1.4960 2.125 2.095 1.000 0.980 0.842 0.875 0.656
1-3/4 1-1/4-7 1.7480 1.7460 2.375 2.345 1.125 1.105 0.948 1.000 0.750
2 1-1/2-6 1.9980 1.9960 2.750 2.720 1.250 1.230 1.054 1.250 0.937