Wrench Size | Hexagon Width Across Flats | Hexagon Width Across Corners | Length of Short Arm | Length of Long Arm (Short Series) | Radius of Bend | Chamfer | Torsional Shear - Ave. | Torque Rating | ||||
Max | Min | Max | Min | Max | Min | Max | Min | Min | Max | (Inch-Pounds) | (Inch Pounds) | |
5/16 (0.312) | 0.3125 | 0.3110 | 0.3570 | 0.3531 | 1.344 | 1.156 | 3.844 | 3.656 | 0.312 | 0.032 | 1600.0 | 1315.00 |
SEE NOTES 1 | 2 | 1 | 7 | 8 |
NOTES: |
(1) Ends | (5) Plating |
(2) Rounding of Corner | (6) Product Applicability |
(3) Material | (7) Designation |
(4) For sizes above 1" |
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/.