| COUNTERSINK ANGLE | 88.0 DEGREES MINIMUM AND 92.0 DEGREES MAXIMUM |
| FASTENER LENGTH | 0.562 INCHES NOMINAL |
| HARDNESS RATING | 60.0 ROCKWELL B MAXIMUM OVERALL |
| HEAD STYLE | FLUSH (FLAT) COUNTERSUNK (INCLUDED ANGLE - LESS THAN 135 DEG W OR W/O CHAMFER) |
| HEAD MAJOR DIAMETER | 0.284 INCHES MINIMUM AND 0.293 INCHES MAXIMUM |
| MATERIAL DOCUMENT AND CLASSIFICATION | QQ-W-321,1/4 H FED SPEC ALL MATERIAL RESPONSES OVERALL |
| MATERIAL | COPPER ALLOY 260 OR COPPER ALLOY 270 OVERALL |
| SHANK DIAMETER | 0.152 INCHES MINIMUM AND 0.158 INCHES MAXIMUM |
| SHANK STYLE | STRAIGHT |