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» Fastener & Gasket » ASME B18.2.1 Heavy Hex Screw
ASME B18.2.1 Heavy Hex Screw
September 27, 2019
Technical Drawing
Drawing for the heavy hex screw made in accordance with ASME B18.2.1.
The ASME B18.2.1 heavy hex screw is manufactured in the same style as the hex cap screw, except that it is more robust. The basic dimensions include E: body diameter; H: head height; F: width across flats; G: width across corners; LT: nominal thread length for screw lengths; J: minimum wrenching height.
Dimensions & Weight Calculation
| Size | E | F | ||
| Max. | Min. | Max. | Min. | |
| 3/8" | 0.3750 | 0.360 | 0.688 | 0.669 |
| 1/2" | 0.5000 | 0.482 | 0.875 | 0.850 |
| 5/8" | 0.6250 | 0.605 | 1.062 | 1.031 |
| 3/4" | 0.7500 | 0.729 | 1.250 | 1.212 |
| 7/8" | 0.8750 | 0.852 | 1.438 | 1.394 |
| 1" | 1.0000 | 0.976 | 1.625 | 1.575 |
| 1-1/8" | 1.1250 | 1.098 | 1.812 | 1.756 |
| 1-1/4" | 1.2500 | 1.223 | 2.000 | 1.938 |
| 1-3/8" | 1.3750 | 1.345 | 2.188 | 2.119 |
| 1-1/2" | 1.5000 | 1.470 | 2.375 | 2.300 |
| 1-5/8" | 1.6250 | 1.591 | 2.562 | 2.481 |
| 1-3/4" | 1.7500 | 1.716 | 2.750 | 2.662 |
| 1-7/8" | 1.8750 | 1.839 | 2.938 | 2.844 |
| 2" | 2.0000 | 1.964 | 3.125 | 3.025 |
| 2-1/4" | 2.2500 | 2.214 | 3.500 | 3.388 |
| 2-1/2" | 2.5000 | 2.4610 | 3.8750 | 3.750 |
| 2-3/4" | 2.7500 | 2.7110 | 4.2500 | 4.112 |
| 3" | 3.0000 | 2.9610 | 4.6250 | 4.475 |
| 3-1/4" | 3.2500 | 3.2100 | 5.0000 | 4.838 |
| 3-1/2" | 3.5000 | 3.4610 | 5.3750 | 5.200 |
| 3-3/4" | 3.7500 | 3.7109 | 5.7500 | 5.562 |
| 4" | 4.0000 | 3.9609 | 6.1250 | 5.925 |
| 4-1/4" | 4.2500 | 4.2228 | 6.5000 | 6.288 |
| 4-1/2" | 4.5000 | 4.4727 | 6.8750 | 6.650 |
| 4-3/4" | 4.7500 | 4.7227 | 7.2500 | 7.012 |
| 5" | 5.0000 | 4.9726 | 7.6250 | 7.375 |
| 5-1/4" | 5.2500 | 5.2226 | 8.0000 | 7.738 |
| 5-1/2" | 5.5000 | 5.4726 | 8.3750 | 8.100 |
| 5-3/4" | 5.7500 | 5.7225 | 8.7500 | 8.462 |
| 6" | 6.0000 | 5.9725 | 9.1250 | 8.825 |
| Size | J | H | |
| Max. | Min. | ||
| 3/8" | 0.160 | 0.243 | 0.226 |
| 1/2" | 0.215 | 0.323 | 0.302 |
| 5/8" | 0.269 | 0.403 | 0.378 |
| 3/4" | 0.324 | 0.483 | 0.455 |
| 7/8" | 0.378 | 0.563 | 0.531 |
| 1" | 0.416 | 0.627 | 0.591 |
| 1-1/8" | 0.461 | 0.718 | 0.658 |
| 1-1/4" | 0.530 | 0.813 | 0.749 |
| 1-3/8" | 0.569 | 0.878 | 0.810 |
| 1-1/2" | 0.640 | 0.974 | 0.902 |
| 1-5/8" | 0.694 | 1.038 | 0.962 |
| 1-3/4" | 0.748 | 1.134 | 1.054 |
| 1-7/8" | 0.802 | 1.198 | 1.114 |
| 2" | 0.825 | 1.263 | 1.175 |
| 2-1/4" | 0.933 | 1.423 | 1.327 |
| 2-1/2" | 1.042 | 1.583 | 1.479 |
| 2-3/4" | 1.151 | 1.744 | 1.632 |
| 3" | 1.290 | 1.935 | 1.815 |
| 3-1/4" | 1.399 | 2.126 | 1.998 |
| 3-1/2" | 1.484 | 2.256 | 2.120 |
| 3-3/4" | 1.612 | 2.447 | 2.303 |
| 4" | 1.697 | 2.576 | 2.424 |
| 4-1/4" | 1.826 | 2.768 | 2.608 |
| 4-1/2" | 1.910 | 2.896 | 2.728 |
| 4-3/4" | 2.038 | 3.088 | 2.912 |
| 5" | 2.123 | 3.217 | 3.033 |
| 5-1/4" | 2.251 | 3.408 | 3.216 |
| 5-1/2" | 2.337 | 3.538 | 3.338 |
| 5-3/4" | 2.465 | 3.729 | 3.521 |
| 6" | 2.549 | 3.858 | 3.642 |
| Size | LT | G | ||
| ≤6" | ≥6" | Max. | Min. | |
| 3/8" | 1.000 | 1.250 | 0.794 | 0.763 |
| 1/2" | 1.250 | 1.500 | 1.010 | 0.969 |
| 5/8" | 1.500 | 1.750 | 1.227 | 1.175 |
| 3/4" | 1.750 | 2.000 | 1.443 | 1.383 |
| 7/8" | 2.000 | 2.250 | 1.660 | 1.589 |
| 1" | 2.250 | 2.500 | 1.876 | 1.796 |
| 1-1/8" | 2.500 | 2.750 | 2.093 | 2.002 |
| 1-1/4" | 2.750 | 3.000 | 2.309 | 2.209 |
| 1-3/8" | 3.000 | 3.250 | 2.526 | 2.416 |
| 1-1/2" | 3.250 | 3.500 | 2.742 | 2.622 |
| 1-5/8" | 3.500 | 3.750 | 2.959 | 2.829 |
| 1-3/4" | 3.750 | 4.000 | 3.175 | 3.035 |
| 1-7/8" | 4.000 | 4.250 | 3.392 | 3.242 |
| 2" | 4.250 | 4.500 | 3.608 | 3.449 |
| 2-1/4" | - | 5.000 | 4.041 | 3.862 |
| 2-1/2" | - | 5.500 | 4.474 | 4.275 |
| 2-3/4" | - | 6.000 | 4.907 | 4.688 |
| 3" | - | 6.500 | 5.340 | 5.102 |
| 3-1/4" | - | 7.000 | 5.774 | 5.515 |
| 3-1/2" | - | 7.500 | 6.207 | 5.928 |
| 3-3/4" | - | 8.000 | 6.640 | 6.341 |
| 4" | - | 8.500 | 7.073 | 6.755 |
| 4-1/4" | - | 9.000 | 7.506 | 7.168 |
| 4-1/2" | - | 9.500 | 7.939 | 7.581 |
| 4-3/4" | - | 10.000 | 8.372 | 7.994 |
| 5" | - | 10.500 | 8.805 | 8.408 |
| 5-1/4" | - | 11.000 | 9.238 | 8.821 |
| 5-1/2" | - | 11.500 | 9.671 | 9.234 |
| 5-3/4" | - | 12.000 | 10.104 | 9.647 |
| 6" | - | 12.500 | 10.537 | 10.060 |
| ASME B18.2.1 Nine Types of Bolts & Screws | ||
|---|---|---|
| Square Head Bolt | Hex Bolt | Heavy Hex Bolt |
| Askew Head Bolt | Hex Cap Screw | Heavy Hex Screw |
| Hex Flange Screw | Lobed Head Screw | Lag Screw |
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