ASME B18.3 Hexagon Socket Flat Head Cap Screws
ASME B18.3 Hexagon Socket Flat Head Cap Screw Dimensions
Nominal Size or Basic Screw Diameter |
Body Diameter, D |
Head Diameter, A |
Head Height, H |
Hexagon Socket Size |
Key Engagement, T |
Max |
Min |
Theo. Sharp Max |
Abs Min |
Ref |
Nom |
Min |
0 |
0.0600 |
0.0600 |
0.0568 |
0.138 |
0.117 |
0.044 |
0.035 |
0.025 |
1 |
0.0730 |
0.0730 |
0.0695 |
0.168 |
0.143 |
0.054 |
0.050 |
0.031 |
2 |
0.0860 |
0.0860 |
0.0822 |
0.197 |
0.168 |
0.064 |
0.050 |
0.038 |
3 |
0.0990 |
0.0990 |
0.0949 |
0.226 |
0.193 |
0.073 |
1/16 |
0.044 |
4 |
0.1120 |
0.1120 |
0.1075 |
0.255 |
0.218 |
0.083 |
1/16 |
0.055 |
5 |
0.1250 |
0.1250 |
0.1202 |
0.281 |
0.240 |
0.090 |
5/64 |
0.061 |
6 |
0.1380 |
0.1380 |
0.1329 |
0.307 |
0.263 |
0.097 |
5/64 |
0.066 |
8 |
0.1640 |
0.1640 |
0.1585 |
0.359 |
0.311 |
0.112 |
3/32 |
0.076 |
10 |
0.1900 |
0.1900 |
0.1840 |
0.411 |
0.359 |
0.127 |
1/8 |
0.087 |
1/4 |
0.2500 |
0.2500 |
0.2435 |
0.531 |
0.480 |
0.161 |
5/32 |
0.111 |
5/16 |
0.3125 |
0.3125 |
0.3053 |
0.656 |
0.600 |
0.198 |
3/16 |
0.135 |
3/8 |
0.3750 |
0.3750 |
0.3678 |
0.781 |
0.720 |
0.234 |
7/32 |
0.159 |
7/16 |
0.4375 |
0.4375 |
0.4294 |
0.844 |
0.781 |
0.234 |
1/4 |
0.159 |
1/2 |
0.5000 |
0.5000 |
0.4919 |
0.938 |
0.872 |
0.251 |
5/16 |
0.172 |
5/8 |
0.6250 |
0.6250 |
0.6163 |
1.188 |
1.112 |
0.324 |
3/8 |
0.220 |
3/4 |
0.7500 |
0.7500 |
0.7406 |
1.438 |
1.355 |
0.396 |
1/2 |
0.220 |
7/8 |
0.8750 |
0.8750 |
0.8647 |
1.688 |
1.604 |
0.468 |
9/16 |
0.248 |
1 |
1.0000 |
1.0000 |
0.9886 |
1.938 |
1.841 |
0.540 |
5/8 |
0.297 |
1 1/8 |
1.1250 |
1.1250 |
1.1086 |
2.188 |
2.079 |
0.611 |
3/4 |
0.325 |
1 1/4 |
1.2500 |
1.2500 |
1.2336 |
2.438 |
2.316 |
0.683 |
7/8 |
0.358 |
1 3/8 |
1.3750 |
1.3750 |
1.3568 |
2.688 |
2.553 |
0.755 |
7/8 |
0.402 |
1 1/2 |
1.5000 |
1.5000 |
1.4818 |
2.938 |
2.791 |
0.827 |
1 |
0.435 |