| FASTENER LENGTH | 0.380 INCHES MINIMUM AND 0.390 INCHES MAXIMUM |
| HARDNESS RATING | 66.0 ROCKWELL A MINIMUM AND 69.0 ROCKWELL A MAXIMUM OVERALL |
| HEAD DIAMETER | 0.375 INCHES NOMINAL |
| HEAD HEIGHT | 0.300 INCHES MINIMUM AND 0.310 INCHES MAXIMUM |
| HEAD STYLE | FLAT CHAMFER |
| INTERNAL DRIVE STYLE | SLOT |
| MATERIAL DOCUMENT AND CLASSIFICATION | 66 FED STD SINGLE MATERIAL RESPONSE OVERALL |
| MATERIAL | STEEL COMP 4140 OVERALL |
| NOMINAL THREAD DIAMETER | 0.375 INCHES |
| POINT STYLE | FLAT |
| SPLINE WIDTH | 0.060 INCHES MINIMUM AND 0.070 INCHES MAXIMUM |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | MIL-C-16232,TY 2 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL |
| SURFACE TREATMENT | PHOSPHATE OVERALL |
| THREAD CLASS | 2A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 0.290 INCHES MINIMUM AND 0.310 INCHES MAXIMUM |
| THREAD SERIES DESIGNATOR | UNF |
| THREAD QUANTITY PER INCH | 24 |