| COUNTERSINK ANGLE | 81.0 DEGREES NOMINAL |
| DEPARTURE FROM CITED DOCUMENT | AS MODIFIED BY SURFACE TREATMENT |
| FASTENER LENGTH | 0.500 INCHES NOMINAL |
| HEAD DIAMETER | 0.195 INCHES MINIMUM AND 0.225 INCHES MAXIMUM |
| HEAD STYLE | FLAT COUNTERSUNK |
| INTERNAL DRIVE STYLE | SLOT |
| 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 260 OR COPPER ALLOY 268 OR COPPER ALLOY 270 OVERALL |
| MINIMUM TENSILE STRENGTH | 50000 POUNDS PER SQUARE INCH |
| NONDEFINITIVE SPEC/STD DATA | 1 TYPE AND 2S STYLE |
| NONMACHINE NOMINAL THREAD DIAMETER | 0.112 INCHES |
| NONMACHINE THREAD STYLE | GIMLET POINT (TYPE A, AB OR BA) |
| SURFACE TREATMENT | CHROMIUM OVERALL |