Hex Flange Screws
ASME B18.2.3.4 Dimensions of Hex Flange Screws
All dimensions are in mm unless mentioned otherwise
| Nominal Size or Basic Major Diameter of Thread | Body Diam., E | Width Across Flats, F | Width Across Corners, G | Maximum Flange Diam., B | Minimum Flange Thickness, K | Maximum Head Height, H | Minimum Hex Height, H1 | Maximum Flange Top Radius, R2 |
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| inch | mm | Max | Min | Basic | Max | Min | Max | Min | |||||
| 1/4 | 0.25 | 0.25 | 0.245 | 0.375 | 0.375 | 0.367 | 0.433 | 0.409 | 0.56 | 0.04 | 0.28 | 0.17 | 0.015 |
| 5/16 | 0.3125 | 0.3125 | 0.3065 | 0.5 | 0.5 | 0.489 | 0.577 | 0.548 | 0.68 | 0.05 | 0.32 | 0.21 | 0.019 |
| 3/8 | 0.375 | 0.375 | 0.369 | 0.5625 | 0.5625 | 0.551 | 0.65 | 0.618 | 0.81 | 0.06 | 0.39 | 0.25 | 0.022 |
| 7/16 | 0.4375 | 0.4375 | 0.4305 | 0.625 | 0.625 | 0.612 | 0.722 | 0.685 | 0.93 | 0.07 | 0.46 | 0.3 | 0.026 |
| 1/2 | 0.5 | 0.5 | 0.493 | 0.75 | 0.75 | 0.736 | 0.866 | 0.825 | 1.07 | 0.08 | 0.51 | 0.34 | 0.03 |
| 9/16 | 0.5625 | 0.5625 | 0.5545 | 0.8125 | 0.8125 | 0.798 | 0.938 | 0.895 | 1.19 | 0.09 | 0.57 | 0.38 | 0.034 |
| 5/8 | 0.625 | 0.625 | 0.617 | 0.9375 | 0.9375 | 0.922 | 1.083 | 1.034 | 1.33 | 0.1 | 0.62 | 0.42 | 0.038 |
| 3/4 | 0.75 | 0.75 | 0.741 | 1.125 | 1.125 | 1.1 | 1.299 | 1.234 | 1.59 | 0.11 | 0.73 | 0.51 | 0.045 |
All dimensions are in mm unless mentioned otherwise
| Nominal Size or Basic Major Diameter of Thread | Minimum Bearing Diam., B₁ | Maximum Runout of Bearing Surface FIM | Basic Thread Length, Lr | Maximum Transition Thread Length, Y | Ring T | Ring B | |||||
| For Screws With L≤ 6 in. | For Screws With L> 6 in. | For Screws With L≤ 6 in. | For Screws With L> 6 in. | Inside Diameter | Minimum Thickness | Inside Diameter | Thickness | ||||
| inch | mm | +0.0000 0.0003 | +0.0000 0.0003 | +0.0000 0.0003 |
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| 1/4 | 0.25 | 0.25 | 0.01 | 0.75 | 1 | 0.4 | 0.65 | 0.4093 | 0.5 | 0.438 | 0.1186 |
| 5/16 | 0.3125 | 0.3125 | 0.011 | 0.875 | 1.125 | 0.417 | 0.667 | 0.5483 | 0.5 | 0.582 | 0.1457 |
| 3/8 | 0.375 | 0.375 | 0.012 | 1 | 1.25 | 0.438 | 0.688 | 0.6183 | 0.5 | 0.655 | 0.1729 |
| 7/16 | 0.4375 | 0.4375 | 0.013 | 1.125 | 1.375 | 0.464 | 0.714 | 0.6853 | 0.5 | 0.73 | 0.21 |
| 1/2 | 0.5 | 0.5 | 0.014 | 1.25 | 1.5 | 0.481 | 0.731 | 0.8253 | 0.5 | 0.875 | 0.2371 |
| 9/16 | 0.5625 | 0.5625 | 0.015 | 1.375 | 1.625 | 0.75 | 0.75 | 0.8953 | 0.5 | 0.95 | 0.2643 |
| 5/8 | 0.625 | 0.625 | 0.017 | 1.5 | 1.75 | 0.773 | 0.773 | 1.0343 | 0.5 | 1.095 | 0.2914 |
| 3/4 | 0.75 | 0.75 | 0.02 | 1.75 | 2 | 0.8 | 0.8 | 1.2343 | 0.5 | 1.312 | 0.3557 |