| MATERIAL | STEEL COMP E4340 OR |
| STEEL COMP 8740 OR |
| STEEL COMP 4140 OVERALL |
| 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 |
| SURFACE TREATMENT | CADMIUM AND |
| CHROMATE OVERALL |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-P-416, TYPE II, CLASS 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| HARDNESS RATING | 39.0 ROCKWELL C MINIMUM AND |
| 44.0 ROCKWELL C MAXIMUM OVERALL |
| HEAD STYLE | FLUSH COUNTERSUNK |
| HEAD MAJOR DIAMETER | 0.428 INCHES MINIMUM AND |
| 0.478 INCHES MAXIMUM |
| COUNTERSINK ANGLE | 99.0 DEGREES MINIMUM AND |
| 101.0 DEGREES MAXIMUM |
| SHANK STYLE | PIN-RIVET, STRAIGHT, THREADED |
| FASTENER LENGTH | 1.248 INCHES NOMINAL |
| WIDTH BETWEEN FLATS | 0.0947 INCHES MINIMUM AND |
| 0.0967 INCHES MAXIMUM |
| SHANK DIAMETER | 0.2645 INCHES MINIMUM AND |
| 0.2661 INCHES MAXIMUM |
| GRIP LENGTH | 0.812 INCHES NOMINAL |
| THREAD SERIES DESIGNATOR | UNJF |
| NOMINAL THREAD SIZE | 0.250 INCHES |
| THREAD CLASS | 3A |
| THREAD QUANTITY PER INCH | 28 |
| LUBRICATION | DRY FILM AND |
| CETYL ALCOHOL |