| MATERIAL | COPPER ALLOY 260 OR |
| COPPER ALLOY 270 OVERALL |
| MATERIAL DOCUMENT AND CLASSIFICATION | QQ-W-321,1/4 HARD FED SPEC ALL MATERIAL RESPONSES OVERALL |
| HARDNESS RATING | 60.0 ROCKWELL B MAXIMUM OVERALL |
| MINIMUM TENSILE STRENGTH | 62000 POUNDS PER SQUARE INCH |
| SHEAR STRENGTH | 35000 SINGLE POUNDS PER SQUARE INCH |
| HEAD STYLE | FLUSH (FLAT) COUNTERSUNK (INCLUDED ANGLE - LESS THAN 135 DEG W OR W/O CHAMFER) |
| HEAD MAJOR DIAMETER | 0.235 INCHES MAXIMUM |
| COUNTERSINK ANGLE | 88.0 DEGREES MINIMUM AND |
| 92.0 DEGREES MAXIMUM |
| SHANK STYLE | STRAIGHT |
| FASTENER LENGTH | 0.234 INCHES MINIMUM AND |
| 0.266 INCHES MAXIMUM |
| SHANK DIAMETER | 0.121 INCHES MINIMUM AND |
| 0.127 INCHES MAXIMUM |
| NONDEFINITIVE SPEC/STD DATA | 10 TYPE AND |
| F GRADE |
| SPEC/STD CONTROLLING DATA | |
| MANUFACTURERS CODE | 81348 |
| NON-DEFINITIVE GOVERNMENT SPEC/STD REFERENCE | FF-R-556 |
| MANUFACTURERS CODE | 96906 |
| DEFINITIVE GOVERNMENT SPEC/STD REFERENCE | MS51945-15 |