Hex head bolts are six-sided bolts known for strength, grip and firm holding in various building and mechanical processes. Caliper Overseas is a trusted Hex Head Bolts Manufacturer and Supplier in India, delivering precise bolts which are used in automotive, infrastructure, machinery and heavy industrial purposes. These bolts are extensively applied where dependable fastening is required for safety and performance.
Made according to international standards such as BS 1768, ASME B18.2.1, JIS B1180 and DIN 558, our hex head bolts provide superior dimensional accuracy, high tensile strength and corrosion resistance. With their durability and high load capacity, they are easy to install and deliver long-term performance even in extreme environments. The consistent threading and heavy hexagonal head make them ideal for torque-based applications.
Call us today for dependable fastening solutions.

| Hex Head Bolts Metric Size | M2 to M42 |
|---|---|
| Hex Head Bolts Inches | 1/4” to 2” |
| Lengths | 30″ maximum |
| Diameter | 1/2 – 1″ |
| Dimensional Standards: | ANSI B18.2.1, ANSI B18.2.3.1M, IS1364, ISO 4014, ISO 4017, DIN 933, DIN 931, BS 1083, BS 1768, ASME B18.2.1, JIS B1180, DIN 558, ISO 4018, DIN-EN14399-4, DIN 601, ISO 4016, CSN 21301, EU 24016, DIN 7968, DIN7990 |
| Bolts Types | Hex Head Bolts |
| Threads | METRIC, BSW, UNC, UNF, BSF or as required |
| Unified Thread Standard (UTS) | UNC, UNF, NPT, UNS, UNEF, NPTF |
| Application | Wind Tower, Nuclear Power, Railway, Automotive Industry, Construction, Electronic Industry |
| Bolts Packaging | Cartoon Box / Wooden Pallet / Wooden Box / Thread Protector |
| Bolts Forming | Hot Forged Bolts & Cold Forged Bolts |
| Certification | Dual Certified As per ASTM & ASME Codes |
| Hex Head Bolt Dimensions (ANSI B18.2.1-1996) | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Nominal Click on Size to Shop Products |
Body Diameter (E) |
Width |
Width Across Corners (G) | Head Height (H) |
Radius of Fillet (R) |
Thread |
|||||||||
| Max | Min | Basic | Max | Min | Max | Min | Basic | Max | Min | Max | Min | Basic (6 in. and shorter) | Basic (Over 6 in.) | ||
| 1/4 (0.2500) | 0.260 | 0.237 | 7/16 | 0.438 | 0.425 | 0.505 | 0.484 | 11/64 | 0.188 | 0.150 | 0.03 | 0.01 | 0.750 | 1.000 | |
| 5/16 (0.3125) | 0.324 | 0.298 | 1/2 | 0.500 | 0.484 | 0.577 | 0.552 | 7/32 | 0.235 | 0.195 | 0.03 | 0.01 | 0.875 | 1.125 | |
| 3/8 (0.3750) | 0.388 | 0.360 | 9/16 | 0.562 | 0.544 | 0.650 | 0.620 | 1/4 | 0.268 | 0.226 | 0.03 | 0.01 | 1.000 | 1.250 | |
| 1/2 (0.5000) | 0.515 | 0.482 | 3/4 | 0.750 | 0.725 | 0.866 | 0.826 | 11/32 | 0.364 | 0.302 | 0.03 | 0.01 | 1.250 | 1.500 | |
| 5/8 (0.6250) | 0.642 | 0.605 | 15/16 | 0.938 | 0.906 | 1.083 | 1.033 | 27/64 | 0.444 | 0.378 | 0.06 | 0.02 | 1.500 | 1.750 | |
| 3/4 (0.7500) | 0.768 | 0.729 | 1-1/8 | 1.125 | 1.088 | 1.299 | 1.240 | 1/2 | 0.524 | 0.455 | 0.06 | 0.02 | 1.750 | 2.000 | |
| 7/8 (0.8750) | 0.895 | 0.852 | 1-5/16 | 1.312 | 1.269 | 1.516 | 1.447 | 37/64 | 0.604 | 0.531 | 0.06 | 0.02 | 2.000 | 2.250 | |
| 1 (1.0000) | 1.022 | 0.976 | 1-1/2 | 1.500 | 1.450 | 1.732 | 1.653 | 43/64 | 0.700 | 0.591 | 0.09 | 0.03 | 2.250 | 2.500 | |
| D1D1 | K | E | S |
|---|---|---|---|
| M3 | 2 | 6.01 | 5.5 |
| M4 | 2.8 | 7.66 | 7 |
| M5 | 3.5 | 8.79 | 8 |
| M6 | 4 | 11.05 | 10 |
| M8 | 5.3 | 14.38 | 13 |
| M10 | 6.4 | 18.9 | 17 |
| M12 | 7.5 | 21.1 | 19 |
| M14 | 8.8 | 24.49 | 22 |
| M16 | 10 | 26.75 | 24 |
| M18 | 11.5 | 30.14 | 27 |
| M20 | 12.5 | 33.53 | 30 |
| M22 | 14 | 35.72 | 32 |
| M24 | 15 | 39.98 | 36 |
| M27 | 17 | 45.2 | 41 |
| M30 | 18.7 | 50.85 | 46 |
| M33 | 21 | 55.37 | 50 |
| M36 | 22.5 | 60.79 | 55 |
| M42 | 26 | 71.3 | 65 |
| M48 | 30 | 82.6 | 75 |
| Length | Diameter | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| 1⁄2" | 5⁄8" | 3⁄4" | 7⁄8" | 1" | 11⁄8" | 11⁄4" | 13⁄8 | 11⁄2 | |
| 1 | 16.5 | 29.4 | 47.0 | - | - | - | - | - | - |
| 11⁄4 | 17.8 | 31.3 | 49.6 | 74.4 | 104 | - | - | - | - |
| 11⁄2 | 19.2 | 33.1 | 52.2 | 78 | 109 | 148 | 197 | - | - |
| 13⁄4 | 20.5 | 35.3 | 55.3 | 81.9 | 114 | 154 | 205 | 261 | 333 |
| 2 | 21.9 | 37.4 | 58.4 | 86.1 | 119 | 160 | 212 | 270 | 344 |
| 21⁄4 | 23.3 | 39.8 | 61.6 | 90.3 | 124 | 167 | 220 | 279 | 355 |
| 21⁄2 | 24.7 | 41.7 | 64.7 | 94.6 | 130 | 174 | 229 | 290 | 366 |
| 23⁄4 | 26.1 | 43.9 | 67.8 | 98.8 | 135 | 181 | 237 | 300 | 379 |
| 3 | 27.4 | 46.1 | 70.9 | 103 | 141 | 188 | 246 | 310 | 391 |
| 31⁄4 | 28.8 | 48.2 | 74 | 107 | 146 | 195 | 255 | 321 | 403 |
| 31⁄2 | 30.2 | 50.4 | 77.1 | 111 | 151 | 202 | 263 | 332 | 416 |
| 33⁄4 | 31.6 | 52.5 | 80.2 | 116 | 157 | 209 | 272 | 342 | 428 |
| 4 | 33 | 54.7 | 83.3 | 120 | 162 | 216 | 280 | 353 | 441 |
| 41⁄4 | 34.3 | 56.9 | 86.4 | 124 | 168 | 223 | 289 | 363 | 453 |
| 41⁄2 | 35.7 | 59 | 89.5 | 128 | 173 | 230 | 298 | 374 | 465 |
| 43⁄4 | 37.1 | 61.2 | 92.7 | 133 | 179 | 237 | 306 | 384 | 478 |
| 5 | 38.5 | 63.3 | 95.8 | 137 | 184 | 244 | 315 | 395 | 490 |
| 51⁄4 | 39.9 | 65.5 | 98.9 | 141 | 190 | 251 | 324 | 405 | 503 |
| 51⁄2 | 41.2 | 67.7 | 102 | 146 | 196 | 258 | 332 | 416 | 515 |
| 53⁄4 | 42.6 | 69.8 | 105 | 150 | 201 | 265 | 341 | 426 | 527 |
| 6 | 44 | 71.9 | 108 | 154 | 207 | 272 | 349 | 437 | 540 |
| 61⁄4 | - | 74.1 | 111 | 158 | 212 | 279 | 358 | 447 | 552 |
| 61⁄2 | - | 76.3 | 114 | 163 | 218 | 286 | 367 | 458 | 565 |
| 63⁄4 | - | 78.5 | 118 | 167 | 223 | 293 | 375 | 468 | 577 |
| 7 | - | 80.6 | 121 | 171 | 229 | 300 | 384 | 479 | 589 |
| 71⁄4 | - | 82.8 | 124 | 175 | 234 | 307 | 392 | 489 | 602 |
| 71⁄2 | - | 84.9 | 127 | 179 | 240 | 314 | 401 | 500 | 614 |
| 73⁄4 | - | 87.1 | 130 | 183 | 246 | 321 | 410 | 510 | 626 |
| 8 | - | 89.2 | 133 | 187 | 251 | 328 | 418 | 521 | 639 |
| 81⁄4 | - | - | - | 192 | 257 | 335 | 427 | 531 | 651 |
| 81⁄2 | - | - | - | 196 | 262 | 342 | 435 | 542 | 664 |
| 83⁄4 | - | - | - | - | - | - | 444 | 552 | 676 |
| 9 | - | - | - | - | - | - | 453 | 563 | 689 |
| Per inch Adder |
5.5 | 8.6 | 12.4 | 16.9 | 22.1 | 28 | 34.4 | 42.5 | 49.7 |
| F436 Round Washers | 2.1 | 3.6 | 4.8 | 7 | 9.4 | 11.3 | 13.8 | 16.8 | 20 |
Hex Head Bolts in Distillery Plants
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