| FASTENER LENGTH | 0.312 INCHES NOMINAL |
| HEAD DIAMETER | 0.240 INCHES MINIMUM AND 0.260 INCHES MAXIMUM |
| HEAD HEIGHT | 0.091 INCHES MINIMUM AND 0.103 INCHES MAXIMUM |
| HEAD STYLE | ROUND |
| INTERNAL DRIVE STYLE | SLOT |
| MATERIAL DOCUMENT AND CLASSIFICATION | QQ-S-671 FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| MATERIAL | STEEL COMP 1010 OVERALL |
| MINIMUM YIELD STRENGTH | 60000 POUNDS PER SQUARE INCH |
| NOMINAL THREAD DIAMETER | 0.138 INCHES |
| PRIMARY WASHER MATERIAL THICKNESS | 0.016 INCHES NOMINAL |
| PRIMARY WASHER OUTSIDE DIAMETER | 0.270 INCHES MINIMUM AND 0.280 INCHES MAXIMUM |
| PRIMARY WASHER STYLE | FLAT EXTERNAL TEETH |
| WASHER QUANTITY | 1 |
| SURFACE TREATMENT | CADMIUM OVERALL |
| THREAD CLASS | 2A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 0.312 INCHES NOMINAL |
| THREAD QUANTITY PER INCH | 32 |
| THREAD SERIES DESIGNATOR | UNC |