| COUNTERSINK ANGLE | 148.0 DEGREES MINIMUM AND 150.0 DEGREES MAXIMUM |
| FASTENER LENGTH | 0.562 INCHES NOMINAL |
| HEAD HEIGHT | 0.053 INCHES MINIMUM AND 0.067 INCHES MAXIMUM |
| HEAD MAJOR DIAMETER | 0.478 INCHES MAXIMUM |
| HEAT TREATMENT | QUARTER HARD OVERALL |
| HEAD STYLE | COUNTERSUNK W/ REVERSE CHAMFER |
| HOLE DEPTH | 0.219 INCHES NOMINAL |
| HOLE DIAMETER | 0.173 INCHES MINIMUM AND 0.183 INCHES MAXIMUM |
| MATERIAL DOCUMENT AND CLASSIFICATION | QQ-W-321 1/4 HARD FED SPEC ALL MATERIAL RESPONSES OVERALL |
| MATERIAL | COPPER ALLOY 260 OR COPPER ALLOY 270 OVERALL |
| NONDEFINITIVE SPEC/STD DATA | 13 TYPE AND F GRADE |
| SHANK DIAMETER | 0.244 INCHES MINIMUM AND 0.252 INCHES MAXIMUM |
| SHANK STYLE | TUBULAR |
| SHEAR STRENGTH | 35000 DOUBLE POUNDS PER SQUARE INCH |
| SPECIAL FEATURES | OPTIONAL TAPERED HOLE |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | MIL-F-495 MIL SPEC 1ST TREATMENT RESPONSE OVERALL |
| SURFACE TREATMENT | OXIDE OVERALL |