| COLOR | BLACK OVERALL |
| COUNTERSINK ANGLE | 80.0 DEGREES MINIMUM AND 84.0 DEGREES MAXIMUM |
| FASTENER LENGTH | 0.750 INCHES NOMINAL |
| HARDNESS RATING | 39.0 ROCKWELL C MINIMUM AND 45.0 ROCKWELL C MAXIMUM OVERALL |
| HEAD DIAMETER | 0.480 INCHES MINIMUM AND 0.531 INCHES MAXIMUM |
| HEAD STYLE | FLAT COUNTERSUNK |
| INTERNAL DRIVE STYLE | HEXAGON |
| MATERIAL DOCUMENT AND CLASSIFICATION | QQ-N-281 CLA FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| MATERIAL | NICKEL ALLOY 400 OVERALL |
| MINIMUM YIELD STRENGTH | 155000 POUNDS PER SQUARE INCH |
| MINIMUM TENSILE STRENGTH | 180000 POUNDS PER SQUARE INCH |
| NOMINAL THREAD DIAMETER | 0.250 INCHES |
| NONDEFINITIVE SPEC/STD DATA | 4 TYPE |
| WIDTH ACROSS FLATS | 0.156 INCHES NOMINAL |
| SURFACE FINISH | 32.0 MICROINCHES BEARING SURFACE OF HEAD |
| SURFACE FINISH | 32.0 MICROINCHES FASTENER |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | MIL-C-13924 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL |
| SURFACE TREATMENT | OXIDE OVERALL |
| THREAD CLASS | 3A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 0.489 INCHES MINIMUM AND 0.589 INCHES MAXIMUM |
| THREAD SERIES DESIGNATOR | UNIFIED NATIONAL COARSE (UNC) |
| THREAD QUANTITY PER INCH | 20 |