Thread & Dimensions
A internal thread (Class 3B)
2-56 UNC
B external thread (Class 3A)
6-40 UNF
Ø max minor special
.1073
Ø C (+.008/-.002)
.086
D (+.015/-.000)
.042
F
.080
G (±.010)
.130
J (±1)
21
Through-hole preparation
Min. full THD depth .273; Min. full depth .160
Blind-hole preparation
Min. full THD depth .223; Min. full depth .160
Material & Finish
Material
Alloy Steel 4130 per AMS 6370
Finish
Cadmium Plated per AMS-QQ-P-416 Type 2, Class 3 & SFL per SAE AS5272
Temperature range
Up to 450+°F
Heat treat
RC 25-34
Magnetic
YES