| FASTENER LENGTH | 1.000 INCHES NOMINAL |
| HEAD HEIGHT | 0.055 INCHES MINIMUM AND 0.065 INCHES MAXIMUM |
| HEAD MAJOR DIAMETER | 0.306 INCHES MINIMUM AND 0.318 INCHES MAXIMUM |
| HEAD STYLE | OVAL/TRUSS |
| HOLE DEPTH | 0.155 INCHES NOMINAL |
| HOLE DIAMETER | 0.134 INCHES MINIMUM AND 0.141 INCHES MAXIMUM |
| IDENTIFICATION CODE COLOR | BLACK |
| MATERIAL DOCUMENT AND CLASSIFICATION | QQ-W-321,1/4 HARD FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| MATERIAL | COPPER ALLOY 260 OR COPPER ALLOY 270 OVERALL |
| NONDEFINITIVE SPEC/STD DATA | 12 TYPE AND 3 CLASS AND F GRADE |
| SHANK DIAMETER | 0.182 INCHES MINIMUM AND 0.188 INCHES MAXIMUM |
| SHANK STYLE | TUBULAR |
| SHEAR STRENGTH | 35000 SINGLE POUNDS PER SQUARE INCH |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | MIL-F-495 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL |
| SURFACE TREATMENT | OXIDE OVERALL |