| COUNTERSINK ANGLE | 100.0 DEGREES NOMINAL |
| FASTENER LENGTH | 0.406 INCHES MINIMUM AND 0.437 INCHES MAXIMUM |
| HARDNESS RATING | 28.0 ROCKWELL C MINIMUM AND 34.0 ROCKWELL C MAXIMUM OVERALL |
| HEAD DIAMETER | 0.275 INCHES MINIMUM AND 0.305 INCHES MAXIMUM |
| HEAD STYLE | FLAT COUNTERSUNK |
| INTERNAL DRIVE STYLE | CROSS RECESS TYPE 1 |
| MATERIAL | STEEL COMP 1022 OR STEEL COMP 1050 OVERALL |
| MINIMUM TENSILE STRENGTH | 125000 POUNDS PER SQUARE INCH |
| NOMINAL THREAD DIAMETER | 0.164 INCHES |
| PRIMARY WASHER MATERIAL THICKNESS | 0.017 INCHES NOMINAL |
| PRIMARY WASHER OUTSIDE DIAMETER | 0.645 INCHES MINIMUM AND 0.665 INCHES MAXIMUM |
| PRIMARY WASHER STYLE | DOME INTERNAL TEETH |
| SECONDARY WASHER MATERIAL THICKNESS | 0.017 INCHES NOMINAL |
| WASHER QUANTITY | 1 |
| THREAD CLASS | 3A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 0.296 INCHES MINIMUM |
| THREAD SERIES DESIGNATOR | UNC |
| THREAD QUANTITY PER INCH | 32 |