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» Fastener & Gasket » ASME B18.2.1 Hex Cap Screw
ASME B18.2.1 Hex Cap Screw
September 27, 2019
Technical Drawing
Drawing for the hex cap screw made in accordance with ASME B18.2.1.
The hex cap screw, manufactured in accordance with the ASME B18.2.1, is the most classic screw with a hexagonal head. It can fit an pre-tapped hole without using a nut. 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
| Size | E | F | ||
| Max. | Min. | Max. | Min. | |
| 1/4" | 0.2500 | 0.2450 | 0.438 | 0.428 |
| 5/16" | 0.3125 | 0.3065 | 0.500 | 0.489 |
| 3/8" | 0.3750 | 0.3690 | 0.562 | 0.551 |
| 7/16" | 0.4375 | 0.4305 | 0.625 | 0.612 |
| 1/2" | 0.5000 | 0.4930 | 0.750 | 0.736 |
| 9/16" | 0.5625 | 0.5545 | 0.812 | 0.798 |
| 5/8" | 0.6250 | 0.6170 | 0.938 | 0.922 |
| 3/4" | 0.7500 | 0.7410 | 1.125 | 1.100 |
| 7/8" | 0.8750 | 0.8660 | 1.312 | 1.285 |
| 1" | 1.0000 | 0.9900 | 1.500 | 1.469 |
| 1-1/8" | 1.1250 | 1.1140 | 1.688 | 1.631 |
| 1-1/4" | 1.2500 | 0.2390 | 1.875 | 1812 |
| 1-3/8" | 1.3750 | 1.3630 | 2.062 | 1994 |
| 1-1/2" | 1.5000 | 1.4880 | 2.250 | 2175 |
| 1-5/8" | 1.6250 | 1.6130 | 2.438 | 2.356 |
| 1-3/4" | 1.7500 | 1.7380 | 2.625 | 2.538 |
| 1-7/8" | 1.8750 | 1.8630 | 2.812 | 2.719 |
| 2" | 2.0000 | 1.9880 | 3.000 | 2.900 |
| 2-1/4" | 2.2500 | 2.2380 | 3.375 | 3.262 |
| 2-1/2" | 2.5000 | 2.4880 | 3.750 | 3.625 |
| 2-3/4" | 2.7500 | 2.7380 | 4.125 | 3.988 |
| 3" | 3.0000 | 2.9880 | 4.500 | 4.350 |
| Size | J | H | |
| Max. | Min. | ||
| 1/4" | 0.106 | 0.163 | 0.150 |
| 5/16" | 0.140 | 0.211 | 0.195 |
| 3/8" | 0.160 | 0.243 | 0.226 |
| 7/16" | 0.195 | 0.291 | 0.272 |
| 1/2" | 0.215 | 0.323 | 0.302 |
| 9/16" | 0.250 | 0.371 | 0.348 |
| 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 |
| Size | LT | G | ||
| ≤6" | ≥6" | Max. | Min. | |
| 1/4" | 0.750 | 1.000 | 0.505 | 0.488 |
| 5/16" | 0.875 | 1.125 | 0.577 | 0.557 |
| 3/8" | 1.000 | 1.250 | 0.650 | 0.628 |
| 7/16" | 1.125 | 1.375 | 0.722 | 0.698 |
| 1/2" | 1.250 | 1.500 | 0.866 | 0.840 |
| 9/16" | 1.375 | 1.625 | 0.938 | 0.910 |
| 5/8" | 1.500 | 1.750 | 1.083 | 1.051 |
| 3/4" | 1.750 | 2.000 | 1.299 | 1.254 |
| 7/8" | 2.000 | 2.250 | 1.516 | 1.465 |
| 1" | 2.250 | 2.500 | 1.732 | 1.675 |
| 1-1/8" | 2.500 | 2.750 | 1.949 | 1.859 |
| 1-1/4" | 2.750 | 3.000 | 2.165 | 2.066 |
| 1-3/8" | 3.000 | 3.250 | 2.382 | 2.273 |
| 1-1/2" | 3.250 | 3.500 | 2.598 | 2.480 |
| 1-5/8" | 3.500 | 3.750 | 2.815 | 2.686 |
| 1-3/4" | 3.750 | 4.000 | 3.031 | 2.893 |
| 1-7/8" | 4.000 | 4.250 | 3.248 | 3.099 |
| 2" | 4.250 | 4.500 | 3.464 | 3.306 |
| 2-1/4" | - | 5.000 | 3.897 | 3.719 |
| 2-1/2" | - | 5.500 | 4.330 | 4.133 |
| 2-3/4" | - | 6.000 | 4.763 | 4.546 |
| 3" | - | 6.500 | 5.196 | 4.959 |
| 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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