
| Nominal Size or Basic Shoulder Diameter | Shoulder Diameter | Head Diameter | Head Height | Head Chamfer | Hex Socket Size | |||
| Max | Min | Max | Min | Max | Min | Max | Nom | |
| 1/4" (0.250) | 0.2480 | 0.2460 | 0.375 | 0.357 | 0.188 | 0.177 | 0.020 | 1/8 (0.125) |
| SEE NOTES | 1 | 2 | 15 | |||||
| Key Engagement | Shoulder Neck Diameter | Basic Thread Diameter | Thread Neck Diameter | Thread Length | Shoulder Length | |
| Min | Min | Max | Min | Basic | ||
| 0.094 | 0.227 | No. 10 - 24 | 0.142 | 0.133 | 0.375 | 5/8 |
| SEE NOTES | 8 | 13 | 10 | 6 | ||
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/.