| THREAD SERIES DESIGNATOR | UNC |
| NOMINAL THREAD DIAMETER | 0.500 INCHES |
| THREAD QUANTITY PER INCH | 13 |
| THREAD CLASS | 3A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 1.596 INCHES MINIMUM AND |
| 1.750 INCHES MAXIMUM |
| FASTENER LENGTH | 1.670 INCHES MINIMUM AND |
| 1.750 INCHES MAXIMUM |
| MATERIAL | PLASTIC POLYAMIDE LOCKING FEATURE |
| STEEL FASTENER |
| MATERIAL DOCUMENT AND CLASSIFICATION | MIL-F-18240 MIL SPEC SINGLE MATERIAL RESPONSE LOCKING FEATURE |
| ASTM A574 ASSN STD SINGLE MATERIAL RESPONSE FASTENER |
| SURFACE TREATMENT | ZINC AND |
| CHROMATE FASTENER |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | ASTM B633, TYPE 2, CLASS FE/ZN5 ASSN STD ALL TREATMENT RESPONSES FASTENER |
| HARDNESS RATING | 39.0 ROCKWELL C MINIMUM AND |
| 45.0 ROCKWELL C MAXIMUM OVERALL |
| MINIMUM TENSILE STRENGTH | 180000 POUNDS PER SQUARE INCH |
| HEAD STYLE | FLAT COUNTERSUNK |
| HEAD DIAMETER | 0.872 INCHES MINIMUM AND |
| 0.938 INCHES MAXIMUM |
| COUNTERSINK ANGLE | 80.0 DEGREES MINIMUM AND |
| 84.0 DEGREES MAXIMUM |
| INTERNAL DRIVE STYLE | HEXAGON |
| WIDTH ACROSS FLATS | 0.312 INCHES NOMINAL |
| LOCKING FEATURE | PATCH OR |
| STRIP THREADS |
| SPEC/STD CONTROLLING DATA | |
| MANUFACTURERS CODE | 96906 |
| DEFINITIVE GOVERNMENT SPEC/STD REFERENCE | MS24667-77ZL |