| COUNTERSINK ANGLE | 80.0 DEGREES MINIMUM AND 82.0 DEGREES MAXIMUM |
| FASTENER LENGTH | 0.219 INCHES MINIMUM AND 0.250 INCHES MAXIMUM |
| HEAD DIAMETER | 0.195 INCHES MINIMUM AND 0.225 INCHES MAXIMUM |
| HEAD STYLE | FLAT COUNTERSUNK |
| INTERNAL DRIVE STYLE | CROSS RECESS TYPE 1 |
| MATERIAL DOCUMENT AND CLASSIFICATION | QQ-B-613 1/4 HARD FED SPEC 1ST MATERIAL RESPONSE OR QQ-B-626 1/4 HARD FED SPEC 1ST MATERIAL RESPONSE OR QQ-W-321 1/4 HARD FED SPEC 1ST MATERIAL RESPONSE OR QQ-B-613 1/4 HARD FED SPEC 2ND MATERIAL RESPONSE OR QQ-B-626 1/4 HARD FED SPEC 2ND MATERIAL RESPONSE OR QQ-W-321 1/4 HARD FED SPEC 3RD MATERIAL RESPONSE OVERALL |
| MATERIAL | COPPER ALLOY OVERALL |
| NONMACHINE NOMINAL THREAD DIAMETER | 0.112 INCHES |
| NONMACHINE THREAD STYLE | GIMLET POINT (TYPE A, AB OR BA) |