Plain = QSC010-------
Case Hardened Steel
Zinc = QSC010-------Z1
| Bolt Diameter | Width Across Flats | Width Across Corners | Head Height | |||
| Max | Min | Max | Min | Max | Min | |
| 10 | 0.188 | 0.180 | 0.265 | 0.247 | 0.148 | 0.134 |
| 1/4 | 0.25 | 0.241 | 0.354 | 0.331 | 0.196 | 0.178 |
| 5/16 | 0.312 | 0.302 | 0.442 | 0.415 | 0.245 | 0.224 |
| 3/8 | 0.375 | 0.362 | 0.530 | 0.497 | 0.293 | 0.270 |
| 7/16 | 0.438 | 0.423 | 0.619 | 0.581 | 0.341 | 0.315 |
| 1/2 | 0.500 | 0.484 | 0.707 | 0.665 | 0.389 | 0.361 |
| 9/16 | 0.562 | 0.545 | 0.795 | 0.748 | 0.437 | 0.407 |
| 5/8 | 0.625 | 0.606 | 0.884 | 0.833 | 0.485 | 0.452 |
| 3/4 | 0.750 | 0.729 | 1.060 | 1.001 | 0.582 | 0.544 |
| 7/8 | 0.875 | 0.852 | 1.237 | 1.170 | 0.678 | 0.635 |
| 1 | 1.00 | 0.974 | 1.414 | 1.337 | 0.774 | 0.726 |
| 1-1/8 | 1.125 | 1.096 | 1.591 | 1.505 | 0.870 | 0.817 |
| 1-1/4 | 1.250 | 1.219 | 1.768 | 1.674 | 0.966 | 0.908 |
| 1-3/8 | 1.750 | 1.342 | 1.945 | 1.843 | 1.063 | 1.00 |
| 1-1/2 | 1.500 | 1.464 | 2.121 | 2.010 | 1.159 | 1.091 |
Disclaimer: The dimensions listed are for reference only. Sizes not listed may be available off the shelf or can be manufactured to customer requirements.