| FASTENER LENGTH | 0.469 INCHES MINIMUM AND 0.500 INCHES MAXIMUM |
| HEAD DIAMETER | 0.146 INCHES MINIMUM AND 0.162 INCHES MAXIMUM |
| HEAD HEIGHT | 0.059 INCHES MINIMUM AND 0.069 INCHES MAXIMUM |
| HEAD STYLE | ROUND |
| 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 260 OR COPPER ALLOY 268 OR COPPER ALLOY 270 OVERALL |
| NONMACHINE NOMINAL THREAD DIAMETER | 0.086 INCHES |
| NONMACHINE THREAD STYLE | GIMLET POINT (TYPE A, AB OR BA) |