
| 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 | |
| 1-1/4" (1.250) | 1.875 | 1.852 | 1.250 | 1.236 | 0.144 | 7/8 (0.875) | 0.620 | 0.475 | 0.020 | 4-1/2 |
| 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/.