Screw Size
American National Standard Hexagon and Spline Socket Flat Countersunk Head Cap Screws ANSI/ASME B18.3-1998
Nominal Size | Body Diameter | Head Diameter | Head Height | Spline Socket Size | Hexagon Socket Size | Key Engagement | ||
---|---|---|---|---|---|---|---|---|
Theoretical Sharp Max. | Abs. Min. | Reference | ||||||
Max. | Min. | Nom. | Min. | |||||
D | A | H | M | J | T | |||
0 | 0.0600 | 0.0568 | 0.138 | 0.117 | 0.044 | 0.048 | 0.035 | 0.025 |
1 | 0.0730 | 0.0695 | 0.168 | 0.143 | 0.054 | 0.060 | 0.050 | 0.031 |
2 | 0.0860 | 0.0822 | 0.197 | 0.168 | 0.064 | 0.060 | 0.050 | 0.038 |
3 | 0.0990 | 0.0949 | 0.226 | 0.193 | 0.073 | 0.072 | 1/16 | 0.044 |
4 | 0.1120 | 0.1075 | 0.255 | 0.218 | 0.083 | 0.072 | 1/16 | 0.055 |
5 | 0.1250 | 0.1202 | 0.281 | 0.240 | 0.090 | 0.096 | 5/64 | 0.061 |
6 | 0.1380 | 0.1329 | 0.307 | 0.263 | 0.097 | 0.096 | 5/64 | 0.066 |
8 | 0.1640 | 0.1585 | 0.359 | 0.311 | 0.112 | 0.111 | 3/32 | 0.076 |
10 | 0.1900 | 0.1840 | 0.411 | 0.359 | 0.127 | 0.145 | 1/8 | 0.087 |
1/4 | 0.2500 | 0.2435 | 0.531 | 0.480 | 0.161 | 0.183 | 5/32 | 0.111 |
5/16 | 0.3125 | 0.3053 | 0.656 | 0.600 | 0.198 | 0.216 | 3/16 | 0.135 |
3/8 | 0.3750 | 0.3678 | 0.781 | 0.720 | 0.234 | 0.251 | 7/32 | 0.159 |
7/16 | 0.4375 | 0.4294 | 0.844 | 0.781 | 0.234 | 0.291 | 1/4 | 0.159 |
1/2 | 0.5000 | 0.4919 | 0.938 | 0.872 | 0.251 | 0.372 | 5/16 | 0.172 |
5/8 | 0.6250 | 0.6163 | 1.188 | 1.112 | 0.324 | 0.454 | 3/8 | 0.220 |
3/4 | 0.7500 | 0.7406 | 1.438 | 1.355 | 0.396 | 0.454 | 1/2 | 0.220 |
7/8 | 0.8750 | 0.8647 | 1.688 | 1.604 | 0.468 | ... | 9/16 | 0.248 |
1 | 1.0000 | 0.9886 | 1.938 | 1.841 | 0.540 | ... | 5/8 | 0.297 |
1 1/8 | 1.1250 | 1.1086 | 2.188 | 2.079 | 0.611 | ... | 3/4 | 0.325 |
1 1/4 | 1.2500 | 1.2336 | 2.438 | 2.316 | 0.683 | ... | 7/8 | 0.358 |
1 3/8 | 1.3750 | 1.3568 | 2.688 | 2.553 | 0.755 | ... | 7/8 | 0.402 |
1 1/2 | 1.5000 | 1.4818 | 2.938 | 2.791 | 0.827 | ... | 1 | 0.435 |