| Square Bolts | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Nominal or Basic Product Diameter Click on Size to Shop Products |
Diameter of Full Size Body (B) | Width Across Flats (W) | Width Across Corners (C) | Head Height (H) | Radius of Fillet (R) | Thread Length for Bolt Lengths | |||||||
| Max | Min | Max | Min Sharp | Max | Min | Max | Min | Max | Min (Basic) | 6 in. & Shorter (Basic) | over 6 in. (Basic) | ||
| 1/4 | .2500 | .260 | .237 | .375 | .362 | .530 | .498 | .188 | .156 | 0.03 | 0.01 | .750 | 1.000 |
| 5/16 | .3125 | .324 | .298 | .500 | .484 | .707 | .665 | .220 | .186 | 0.03 | 0.01 | .875 | 1.125 |
| 3/8 | .3750 | .388 | .360 | .562 | .544 | .795 | .747 | .268 | .232 | 0.03 | 0.01 | 1.000 | 1.250 |
| 7/16 | .4375 | .452 | .421 | .625 | .603 | .884 | .828 | .316 | .278 | 0.03 | 0.01 | 1.125 | 1.375 |
| 1/2 | .5000 | .515 | .482 | .750 | .725 | 1.061 | .995 | .348 | .308 | 0.03 | 0.01 | 1.250 | 1.500 |
| 5/8 | .6250 | .642 | .605 | .938 | .906 | 1.326 | 1.244 | .444 | .400 | 0.06 | 0.02 | 1.500 | 1.750 |
| 3/4 | .7500 | .768 | .729 | 1.125 | 1.088 | 1.591 | 1.494 | .524 | .476 | 0.06 | 0.02 | 1.750 | 2.000 |
| 7/8 | .8750 | .895 | .852 | 1.312 | 1.269 | 1.856 | 1.742 | .620 | .568 | 0.06 | 0.02 | 2.000 | 2.250 |
| 1 | 1.0000 | 1.022 | .976 | 1.500 | 1.450 | 2.121 | 1.991 | .684 | .628 | 0.09 | 0.03 | 2.250 | 2.500 |
| 1-1/8 | 1.1250 | 1.149 | 1.098 | 1.688 | 1.631 | 2.386 | 2.239 | .780 | .720 | 0.09 | 0.03 | 2.500 | 2.750 |
| 1-1/4 | 1.2500 | 1.277 | 1.223 | 1.875 | 1.812 | 2.652 | 2.489 | .876 | .812 | 0.09 | 0.03 | 2.750 | 3.000 |
| 1-3/8 | 1.3750 | 1.404 | 1.345 | 2.062 | 1.994 | 2.917 | 2.738 | .940 | .872 | 0.09 | 0.03 | 3.000 | 3.250 |
| 1-1/2 | 1.5000 | 1.531 | 1.470 | 2.250 | 2.175 | 3.182 | 2.986 | 1.036 | .964 | 0.09 | 0.03 | 3.250 | 3.500 |
* Click on the nominal size to find products.
| Square Bolts: Tolerance on Length | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Nominal Bolt Diameter | Up to 1 in., incl. |
Over 1 in. to 2-1/2 in., incl. | Over 2-1/2 in. to 4 in., incl. | Over 4 in. to 6 in., incl. | Longer than 6 in. | |||||
| 1/4 - 3/8 | +0.02 | -0.03 | +0.02 | -0.04 | +0.04 | -0.06 | +0.06 | -0.10 | +0.10 | -0.18 |
|
7/16 & 1/2 |
+0.02 | -0.03 | +0.04 | -0.06 | +0.06 | -0.08 | +0.08 | -0.10 | +0.12 | -0.18 |
| 9/16 - 3/4 | +0.02 | -0.03 | +0.06 | -0.08 | +0.08 | -0.10 | +0.10 | -0.10 | +0.14 | -0.18 |
| 7/8 - 1 | +0.08 | -0.10 | +0.10 | -0.14 | +0.12 | -0.16 | +0.16 | -0.20 | ||
| 1-1/8 - 1-/12 | +0.12 | -0.12 | +0.16 | -0.16 | +0.18 | -0.18 | +0.22 | -0.22 | ||
| Square Bolts: Performance & Mechanical Stats | ||
|---|---|---|
| Description |
A low or medium carbon steel, externally threaded mechanical device 1/4" diameter or larger, with a trimmed square shaped external |
|
| Applications |
Offers greater bearing surface for wrenching than hex head bolts. |
|
| Material |
Bolts shall be made from a carbon steel which conforms to the following chemical composition requirements-- |
|
| Hardness |
Bolts of a length less than 3 times diameter: Rockwell B69-100 |
|
| Tensile Strength |
60,000 psi. minimum |
|
| Elongation in 2 in. | 18% minimum | |
Additional Resources
