| FIRST END STYLE | SQUARE |
| FIRST STEP DIAMETER | 0.092 INCHES MINIMUM AND 0.094 INCHES MAXIMUM |
| FIRST STEP LENGTH | 0.240 INCHES MINIMUM AND 0.246 INCHES MAXIMUM |
| HEAD STYLE | FLAT |
| HEIGHT | 0.045 INCHES MINIMUM AND 0.050 INCHES MAXIMUM |
| INTERNAL DRIVE STYLE | SLOT |
| MATERIAL DOCUMENT AND CLASSIFICATION | QQ-B-626 1/2 HARD FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| MATERIAL | COPPER ALLOY OVERALL |
| PIN HEAD DIAMETER | 0.151 INCHES MINIMUM AND 0.156 INCHES MAXIMUM |
| SECOND STEP DIAMETER | 0.084 INCHES MINIMUM AND 0.086 INCHES MAXIMUM |
| SECOND STEP LENGTH | 0.029 INCHES MINIMUM AND 0.035 INCHES MAXIMUM |
| STYLE DESIGNATOR | SHOULDER |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | MIL-F-495 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL |
| SURFACE TREATMENT | OXIDE OVERALL |
| UNDER HEAD LENGTH | 0.275 INCHES NOMINAL |