Back
5/16-18 UNC NC
Clear Hole = Drill ~ Probable Ø
Basic
.3125
+.0025
5/16 (.3125) ~ .315
+.006
O (.316) ~ .3185
+.013
P (.323) ~ .3255
+.018
12/64 (.3281) ~ .3306
Cut Tap % ~ Drill ~ Probable Ø
75%
F (.257) ~ .2595
69%
G (.261) ~ .2635
62%
17/64 (.2656) ~ .2681
Form Tap % ~ Drill ~ Probable Ø
65%
7.25mm (.2854) ~ .2879
Socket Head Screw Size
Basic Head Height
.306 - .312
Basic Head Diameter
.457 - .469
General Data
Internal Hex Size
1/4
Stress Area in Sq. In.
.0524