| COUNTERSINK ANGLE | 99.5 DEGREES MINIMUM AND 100.5 DEGREES MAXIMUM |
| COUNTERSINK HEIGHT | 0.062 INCHES MAXIMUM |
| FASTENER LENGTH | 0.557 INCHES MINIMUM AND 0.567 INCHES MAXIMUM |
| HEAD HEIGHT | 0.006 INCHES NOMINAL |
| HEAD STYLE | UNDERSIZED OVAL COUNTERSUNK |
| HEAD MAJOR DIAMETER | 0.396 INCHES MAXIMUM |
| HEAD MINOR DIAMETER | 0.316 INCHES MINIMUM AND 0.326 INCHES MAXIMUM |
| MATERIAL DOCUMENT AND CLASSIFICATION | QQ-N-281 FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| MATERIAL | NICKEL ALLOY 400 OVERALL |
| SHANK DIAMETER | 0.249 INCHES MINIMUM AND 0.252 INCHES MAXIMUM |
| SHANK STYLE | STRAIGHT W/RADIUS CHAMFERED TIP |