Thread & Dimensions
Internal thread A (in, Class 3B)
.1900-32 UNF
External thread B (in)
.2500-28 UNF
External altered minor dia max (in)
.2170
C (in, ±.010)
.290
D dia (in, +.008/-.002)
.192
E (in, +.015/-.000)
.080
F (in, ref)
.075
G (in, ref)
.180
Min shear engagement (in²)
.1098
Counterbore depth (in)
.082
Full thread depth min (in)
.325
Blind-hole drill depth min (in)
.414
Material & Finish
Material
A286 CRES
Finish
Silver plated per SAE AMS2411 grade B, at least 0.0002 in
Hardness
32–40 HRC