| COUNTERSINK ANGLE | 80.0 DEGREES MINIMUM AND 82.0 DEGREES MAXIMUM |
| FASTENER LENGTH | 0.594 INCHES MINIMUM AND 0.625 INCHES MAXIMUM |
| HEAD DIAMETER | 0.389 INCHES MINIMUM AND 0.438 INCHES MAXIMUM |
| HEAD STYLE | FLAT COUNTERSUNK |
| INTERNAL DRIVE STYLE | SLOT |
| MATERIAL DOCUMENT AND CLASSIFICATION | QQ-B-613 ALLOY 260 1/4 H FED SPEC 1ST MATERIAL RESPONSE OR QQ-B-613 ALLOY 1/4 H FED SPEC ALL MATERIAL RESPONSES OR QQ-B-626 ALLOY 268 1/4 H FED SPEC 2ND MATERIAL RESPONSE OR QQ-B-626 ALLOY 260 1/4 H FED SPEC 1ST MATERIAL RESPONSE OR QQ-W-321 ALLOY 270 1/4 H FED SPEC 3RD MATERIAL RESPONSE OR QQ-W-321 ALLOY 260 1/4 H FED SPEC 1ST MATERIAL RESPONSE OVERALL |
| MATERIAL | COPPER ALLOY 260 OR COPPER ALLOY 268 OR COPPER ALLOY 270 OVERALL |
| NONDEFINITIVE SPEC/STD DATA | 1 TYPE AND 2S STYLE |
| NONMACHINE NOMINAL THREAD DIAMETER | 0.216 INCHES |
| NONMACHINE THREAD STYLE | GIMLET POINT (TYPE A, AB OR BA) |