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ASME B18.2.1 Lobed Head Screws
Dimensions of Lobed Head Screws |
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Maximum Minor Diam., B |
Drive Size |
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Nominal Size or Basic Product Diameter of Thread |
Width Across Corners, G |
Head Height, H |
Flange Thickness, K |
Flange Diam., C |
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Reference |
Max. |
Min. |
Max. |
Min. |
Max. |
Min. |
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1/4 |
0.2500 |
0.287 |
0.255 |
0.245 |
0.07 |
0.06 |
0.375 |
0.365 |
0.2073 |
E8 |
5/16 |
0.3125 |
0.362 |
0.323 |
0.313 |
0.1 |
0.09 |
0.469 |
0.457 |
0.2663 |
E10 |
3/8 |
0.3750 |
0.431 |
0.394 |
0.384 |
0.125 |
0.115 |
0.562 |
0.55 |
0.3103 |
E12 |
7/16 |
0.4375 |
0.499 |
0.472 |
0.462 |
0.155 |
0.145 |
0.656 |
0.642 |
0.3613 |
E14 |
1/2 |
0.5000 |
0.571 |
0.515 |
0.505 |
0.16 |
0.15 |
0.75 |
0.735 |
0.4113 |
E16 |
9/16 |
0.5625 |
0.645 |
0.551 |
0.541 |
0.165 |
0.153 |
0.844 |
0.828 |
0.4663 |
E18 |
5/8 |
0.6250 |
0.715 |
0.63 |
0.62 |
0.2 |
0.188 |
0.938 |
0.921 |
0.5183 |
E20 |
3/4 |
0.7500 |
0.86 |
0.787 |
0.777 |
0.255 |
0.243 |
1.125 |
1.107 |
0.6183 |
E24 |
7/8 |
0.8750 |
1 |
0.866 |
0.856 |
0.27 |
0.26 |
1.312 |
1.293 |
0.7193 |
E28 |
1 |
1.0000 |
1.138 |
1.063 |
1.053 |
0.355 |
0.343 |
1.5 |
1.479 |
0.8393 |
E32 |
1 1/8 |
1.1250 |
1.28 |
1.181 |
1.171 |
0.382 |
0.37 |
1.688 |
1.665 |
0.9433 |
E36 |
1 1/4 |
1.2500 |
1.42 |
1.299 |
1.289 |
0.422 |
0.41 |
1.875 |
1.852 |
1.0463 |
E40 |
1 3/8 |
1.3750 |
1.562 |
1.417 |
1.407 |
0.453 |
0.441 |
2.062 |
2.038 |
1.1513 |
E44 |
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