Hex bolts (six-sided heads) are the industry standard for fasteners with forged heads. ASTM A307 grade A bolts, all SAE hex bolts, and several other common specifications require a standard (finished) hex head. For specifications such as A307 grade B, A325, and A490 that require a heavy hex pattern, refer to dimensional tolerances for heavy hex bolts or structural bolts.
Applications
Hex bolts can be used for many different applications that include fastening wood, steel, and other construction materials for projects such as docks, bridges, highway structures, and buildings. Hex bolts with forged heads are also commonly used as headed anchor bolts.
Manufacturing
Portland Bolt manufactures hex bolts from 1/2″ diameter through 2-1/2″ diameter in most ASTM, AASHTO, and SAE specifications. Special tooling can be created to produce nonstandard head dimensions or bolt heads with your company’s name and/or logo.
Stock
Diameters: 1/2 – 1″
Grade: ASTM A307 Grade A, F1554 Grade 36
Lengths: 30″ maximum
Origin: Domestic and import
Finish: Plain and hot dip galvanized
Standard Thread Length
Bolt lengths ≤ 6″: Thread length = (2 X diameter) + 1/4″
Bolt lengths > 6″: Thread length = (2 X diameter) + 1/2″
Note: Most stock hex bolts 10″ and longer will have 6″ of thread.
Hex Bolt Dimensions
| Bolt Diameter | D | F | C | H | |||||
|---|---|---|---|---|---|---|---|---|---|
| Body Diameter | Width Across Flats | Width Across Corners | Height | ||||||
| Max | Basic | Max | Min | Max | Min | Basic | Max | Min | |
| 1⁄2 | 0.515 | 3⁄4 | 0.750 | 0.725 | 0.866 | 0.826 | 11⁄32 | 0.364 | 0.302 |
| 5⁄8 | 0.642 | 15⁄16 | 0.938 | 0.906 | 1.083 | 1.033 | 27⁄64 | 0.444 | 0.378 |
| 3⁄4 | 0.768 | 11⁄8 | 1.125 | 1.088 | 1.299 | 1.240 | 1⁄2 | 0.524 | 0.455 |
| 7⁄8 | 0.895 | 15⁄16 | 1.312 | 1.269 | 1.516 | 1.447 | 37⁄64 | 0.604 | 0.531 |
| 1 | 1.022 | 11⁄2 | 1.500 | 1.450 | 1.732 | 1.653 | 43⁄64 | 0.700 | 0.591 |
| 11⁄8 | 1.149 | 111⁄16 | 1.688 | 1.631 | 1.949 | 1.859 | 3⁄4 | 0.780 | 0.658 |
| 11⁄4 | 1.277 | 17⁄8 | 1.875 | 1.812 | 2.165 | 2.066 | 27⁄32 | 0.876 | 0.749 |
| 13⁄8 | 1.404 | 21⁄16 | 2.062 | 1.994 | 2.382 | 2.273 | 29⁄32 | 0.940 | 0.810 |
| 11⁄2 | 1.531 | 21⁄4 | 2.250 | 2.175 | 2.598 | 2.480 | 1 | 1.036 | 0.902 |
| 15⁄8 | 1.658 | 27⁄16 | 2.438 | 2.356 | 2.815 | 2.616 | 13⁄32 | 1.116 | 0.978 |
| 13⁄4 | 1.785 | 2-5/8 | 2.625 | 2.538 | 3.031 | 2.893 | 15⁄32 | 1.196 | 1.054 |
| 17⁄8 | 1.912 | 213⁄16 | 2.812 | 2.719 | 3.248 | 3.099 | 11⁄4 | 1.276 | 1.130 |
| 2 | 2.039 | 3 | 3.000 | 2.900 | 3.464 | 3.306 | 111⁄32 | 1.388 | 1.175 |
| 21⁄4 | 2.305 | 33⁄8 | 3.375 | 3.262 | 3.897 | 3.719 | 11⁄2 | 1.548 | 1.327 |
| 21⁄2 | 2.559 | 33⁄4 | 3.750 | 3.625 | 4.330 | 4.133 | 121⁄32 | 1.708 | 1.479 |
| Dimensions per ASME B18.2.1 | |||||||||
Stock Domestic Hex Bolts
| Length | Diameter | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 1/2" | 5/8" | 3/4" | 7/8" | 1" | ||||||
| Plain | Galv. | Plain | Galv. | Plain | Galv. | Plain | Galv. | Plain | Galv. | |
| 8 | - | 17490 | - | 17997 | 18035 | 18036 | - | - | - | - |
| 10 | - | 17492 | - | 17999 | 18007 | 18008 | - | - | - | - |
| 12 | - | 17494 | 1800 | 18001 | 18009 | 18010 | - | - | - | - |
| 14 | - | - | - | - | 18013 | 18014 | - | - | 18051 | - |
| 16 | - | - | - | - | 18017 | 18018 | - | 18040* | - | 18054 |
| 18 | - | 17496 | 18002 | 18003 | 18021 | 18022 | 18045* | 18041* | 18055 | 18056 |
| 20 | - | - | - | - | 18023 | 18024 | - | 18042* | - | 18058 |
| 22 | - | - | - | - | - | 18026 | - | - | - | - |
| 24 | - | - | - | 18005 | 18027 | 18028 | 18047* | 18043* | 18061 | 18062 |
| 26 | - | - | - | - | 18029 | 18030 | - | - | - | - |
| 30 | - | - | - | - | - | 18034 | - | 18045* | 18871 | 18872 |
| 36 | - | - | - | - | - | - | - | - | 18876 | 18877 |
| 38 | - | - | - | - | - | - | - | 18878* | - | 18850 |
| These hex bolts meet the requirements of both F1554 Grade 36 and A307 Grade A. * 7/8 diameter bolts meet A307 Grade A and F1554 Grade 55, not F1554 Grade 36 Other sizes and finishes available on request. |
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Stock Import Hex Bolts
| Length (in.) | Diameter | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 1/2" | 5/8" | 3/4" | 7/8" | 1" | ||||||
| Plain | Galv. | Plain | Galv. | Plain | Galv. | Plain | Galv. | Plain | Galv. | |
| 1 | 10235 | 10236 | - | - | 10477 | 10478 | - | - | - | - |
| 11⁄2 | 10239 | 10240 | 10339 | 10340 | - | - | - | - | - | - |
| 2 | 10243 | 10244 | 10343 | 10344 | 10481 | 10482 | 10619 | 10620 | 10729 | 10730 |
| 21⁄2 | 10247 | 10248 | 10347 | 10348 | - | - | 10623 | 10624 | 10733 | 10734 |
| 3 | 10251 | 10252 | 10351 | 10352 | 10489 | 10490 | 10627 | 10628 | 10737 | 10738 |
| 31⁄2 | 10253 | 10254 | 10355 | 10356 | 10493 | 10494 | 10631 | 10632 | 10741 | 10742 |
| 4 | 10255 | 10256 | 10354 | 10360 | 10497 | 10498 | 10635 | 10636 | 10745 | 10746 |
| 41⁄2 | 10257 | 10258 | 10361 | 10362 | 10499 | 10500 | 10639 | 10640 | 10749 | 10750 |
| 5 | 10259 | 10260 | 10363 | 10364 | 10501 | 10502 | 10641 | 10642 | 10751 | 10752 |
| 51⁄2 | 10261 | 10270 | 10365 | 10366 | 10503 | 10504 | - | - | 10753 | 10754 |
| 6 | 10263 | 10264 | 10367 | 10368 | 10505 | 10506 | 10645 | 10646 | 10755 | 10756 |
| 61⁄2 | 10265 | 10266 | 10369 | 10370 | 10507 | 10508 | 10647 | 10648 | 10757 | 10758 |
| 7 | 10267 | 10268 | 10371 | 10372 | 10509 | 10510 | 10649 | 10650 | 10759 | 10760 |
| 71⁄2 | 10269 | 10270 | 10373 | 10374 | 10511 | 10512 | 10651 | 10652 | 10761 | 10762 |
| 8 | 10271 | 10272 | 10375 | 10376 | 10513 | 10514 | 10653 | 10654 | 10763 | 10764 |
| 81⁄2 | 10273 | 10274 | 10377 | 10378 | 10515 | 10516 | - | - | 10765 | 10766 |
| 9 | 10275 | 10276 | 10379 | 10380 | 10517 | 10518 | 10657 | 10658 | 10767 | 10768 |
| 10 | 10279 | 10280 | 10383 | 10384 | 18320 | 18321 | 18328 | 18329 | 18805 | 18806 |
| 11 | 10283 | 10284 | 10387 | 10388 | 18324 | 18325 | 19489 | 19490 | 18809 | 18810 |
| 12 | 10287 | 10288 | 18310 | 18311 | 18326 | 18327 | 18799 | 18800 | 18811 | 18812 |
| 13 | 10295 | 18772 | 18822 | 18823 | 18409 | 19223 | 18850 | 18851 | 19250 | 19251 |
| 14 | 10295 | 10296 | 18312 | 18313 | 19227 | 19228 | 19246 | 19247 | 19252 | 19253 |
| 15 | 18193 | 18194 | 18824 | 18825 | 19229 | 19230 | 18852 | 18853 | 19256 | 19157 |
| 16 | 18773 | 18774 | 18314 | 18315 | 18410 | 19231 | 19248 | 19249 | 19254 | 19255 |
| 18 | 18777 | 18778 | 18316 | 18317 | 19234 | 19235 | 18854 | 18855 | 19260 | 19261 |
| 20 | 18781 | 18782 | 18318 | 18319 | 19238 | 19239 | 18857 | 18858 | 19262 | 19263 |
| 24 | 19503 | - | 18833 | 18834 | 19244 | 19245 | 18862 | 18863 | - | - |
| These sizes are readily available in the marketplace and Portland Bolt stocks many of them in varying quantities. If you require a size that is not listed, Portland Bolt will manufacture them. | ||||||||||