Thread & Dimensions
A internal thread (Class 3B)
1/4-20 UNC
B external thread (Class 3A)
11/32-24 NS
Ø max minor special
.2976
Ø C (+.008/-.002)
.264
D (+.015/-.000)
.095
F ref
.240
G (±.010)
.380
Through-hole preparation
Min. full THD depth .602; Min. full depth 0,415
Blind-hole preparation
Min. full THD depth .519; Min. full depth 0,415
Material & Finish
Material
A286 per AMS5731 or AMS 5734
Finish
PASSIVATED per AMS 2700 & SFL coated per SAE AS5272, Type 1
Temperature range
-400°/+650°F
Heat treat
RC 32-40
Magnetic
NO