| FASTENER LENGTH | 0.625 INCHES NOMINAL |
| HEAD DIAMETER | 0.443 INCHES MINIMUM AND 0.472 INCHES MAXIMUM |
| HEAD HEIGHT | 0.160 INCHES MINIMUM AND 0.175 INCHES MAXIMUM |
| HEAD STYLE | ROUND |
| INTERNAL DRIVE STYLE | TORQUE |
| MATERIAL DOCUMENT AND CLASSIFICATION | QQ-S-633 FED SPEC ALL MATERIAL RESPONSES OVERALL |
| MATERIAL | STEEL COMP 1010 OR STEEL COMP 1011 OR STEEL COMP 1015 OR STEEL COMP 1016 OR STEEL COMP 1018 OR STEEL COMP 1019 OR STEEL COMP 1020 OVERALL |
| NOMINAL THREAD DIAMETER | 0.250 INCHES |
| PRIMARY WASHER MATERIAL THICKNESS | 0.025 INCHES NOMINAL |
| PRIMARY WASHER OUTSIDE DIAMETER | 0.462 INCHES MINIMUM AND 0.474 INCHES MAXIMUM |
| PRIMARY WASHER STYLE | FLAT EXTERNAL TEETH |
| WASHER QUANTITY | 1 |
| SURFACE TREATMENT | CADMIUM OR ZINC OVERALL |
| THREAD CLASS | 2A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 0.625 INCHES MAXIMUM |
| THREAD SERIES DESIGNATOR | UNC |
| THREAD QUANTITY PER INCH | 20 |