| Thread Class |
3A |
| Thread Direction |
Right-hand |
| Thread Length |
0.262 inches minimum and 0.375 inches maximum |
| Fastener Length |
0.345 inches minimum and 0.375 inches maximum |
| Head Style |
Flat Chamfer |
| Head Diameter |
0.303 inches minimum and 0.312 inches maximum |
| Head Height |
0.185 inches minimum and 0.190 inches maximum |
| Internal Drive Style |
Hexagon |
| Thread Diameter |
0.190 inches |
| Width Across Flats |
0.156 inches minimum and 0.159 inches maximum |
| Thread Qty Per Inch (TPI) |
24 |
| Min. Tensile Strength (psi) |
180000 pounds per square inch |
| Hardness Rating |
38.0 Rockwell C minimum overall and 45.0 Rockwell C maximum overall |
| Minimum Yield Strength |
155000 pounds per square inch |
| Color |
Black overall |
| Material |
Steel overall |
| Surface Treatment |
Oxide overall |
| Surface Treatment Specification |
MIL-C-13924, Class 1 Military Specification (Single Treatment Response Overall) |
| Thread Series Designator |
UNRC |
| Specification Data |
80205-NAS1351 Professional/Industrial Association Standard |
