| COUNTERSINK ANGLE | 99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM |
| FASTENER LENGTH | 1.310 INCHES NOMINAL |
| GRIP LENGTH | 0.875 INCHES NOMINAL |
| HARDNESS RATING | 39.0 ROCKWELL C MINIMUM AND 44.0 ROCKWELL C MAXIMUM OVERALL |
| HEAD MAJOR DIAMETER | 0.428 INCHES MINIMUM AND 0.478 INCHES MAXIMUM |
| HEAD STYLE | FLUSH COUNTERSUNK |
| LUBRICATION | DRY FILM AND CETYL ALCOHOL |
| MATERIAL DOCUMENT AND CLASSIFICATION | MIL-S-5000 MIL SPEC 1ST MATERIAL RESPONSE OR MIL-S-6049 MIL SPEC 2ND MATERIAL RESPONSE OR MIL-S-5626 MIL SPEC 3RD MATERIAL RESPONSE OVERALL |
| MATERIAL | STEEL COMP E4340 OR STEEL COMP 8740 OR STEEL COMP 4140 OVERALL |
| NOMINAL THREAD SIZE | 0.250 INCHES |
| SHANK DIAMETER | 0.2645 INCHES MINIMUM AND 0.2661 INCHES MAXIMUM |
| SHANK STYLE | PIN-RIVET, STRAIGHT, THREADED |
| WIDTH BETWEEN FLATS | 0.0947 INCHES MINIMUM AND 0.0967 INCHES MAXIMUM |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-P-416, TYPE II, CLASS 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| SURFACE TREATMENT | CADMIUM AND CHROMATE OVERALL |
| THREAD CLASS | 3A |
| THREAD SERIES DESIGNATOR | UNIFIED NATIONAL JOINT FINE (UNJF) |
| THREAD QUANTITY PER INCH | 28 |