
| Nominal Size or Basic Screw Diameter | Head Diameter | Head Height | Head Chamfer | Hex Socket Size | Key Engagement | Wall Thickness | Edge of Head Chamfer | Length | ||
| Max | Min | Max | Min | Max | Nom | Min | Min | Max | Under Head | |
| 7/16" (0.4375) | 0.656 | 0.642 | 0.438 | 0.430 | 0.047 | 3/8 (0.375) | 0.213 | 0.166 | 0.015 | 3/4 |
| SEE NOTES 1 | 3 | 4 | 20 | 6 | 9, 10, 11 | |||||
Reprinted from ASME/ANSI B18.3 by permission of The American Society of Mechanical Engineers. All rights reserved. For a full copy of the standards, contact the ASME at http://www.asme.org/codes/.