What is a hex head bolt half thread, and how does it differ from other bolt types?
A Hex Head Bolt Half Thread is a type of fastener designed with a hexagonal head on one end and threads covering only a portion of its shank, leaving the remaining length plain and unthreaded. The hexagonal head allows easy gripping and turning using a wrench or socket, making it ideal for applications requiring high torque. The half-thread design means that only a section of the bolt's length is threaded, which can provide advantages in specific situations.
This configuration allows for a secure fastening of materials while also enabling efficient load distribution between the threaded and unthreaded sections. Hex Head Bolt Half Thread differs from other bolt types, such as fully threaded bolts or fully unthreaded ones (known as tap bolts), in its unique combination of threaded and unthreaded sections, making it suitable for applications that require both secure fastening and some degree of flexibility in load distribution.
What are the common applications of hex head bolt half thread in various industries?
Hex head bolt half thread finds widespread applications across various industries due to its unique design features. In the automotive sector, these bolts are commonly used in engine assemblies, transmissions, and chassis components, where their high torque capabilities ensure secure fastening of critical parts. In construction and infrastructure projects, hex head bolt half thread is often employed for connecting structural elements, such as steel beams and columns, offering reliable joint integrity and load distribution. Within the manufacturing industry, these bolts are utilized in machinery assembly, enabling efficient coupling of components and facilitating maintenance and repairs.
The aerospace sector relies on hex head bolt half thread for aircraft assembly, where the combination of threaded and unthreaded sections helps to achieve robust connections while reducing overall weight. In consumer goods and electronics manufacturing, these bolts are essential fasteners for assembling furniture, appliances, and electronic devices, ensuring stability and longevity. The versatility of hex head bolt half thread makes it a go-to choice in numerous applications, meeting the demands for secure fastening and load-bearing in diverse industrial settings.
| Hex Head Bolts Half Thread Metric Size | M2 to M42 |
|---|---|
| Half Threaded 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 |
| Half Thread 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 Half Thread in Distillery Plants
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Hex Head Bolts Half Thread in Petrochemical Plants
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