| THREAD SERIES DESIGNATOR | UNC |
| NOMINAL THREAD DIAMETER | 0.112 INCHES |
| THREAD QUANTITY PER INCH | 40 |
| THREAD CLASS | 2A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 0.500 INCHES NOMINAL |
| FASTENER LENGTH | 0.500 INCHES NOMINAL |
| MATERIAL | COPPER ALLOY SECONDARY WASHER |
| COPPER ALLOY 510 PRIMARY WASHER |
| COPPER ALLOY 230 FASTENER |
| SURFACE TREATMENT | TIN OVERALL |
| MINIMUM TENSILE STRENGTH | 55000 POUNDS PER SQUARE INCH |
| HEAD STYLE | PAN NO. 2 |
| HEAD DIAMETER | 0.219 INCHES NOMINAL |
| HEAD HEIGHT | 0.218 INCHES NOMINAL |
| INTERNAL DRIVE STYLE | SLOT |
| WASHER QUANTITY | 2 |
| PRIMARY WASHER STYLE | SPLIT HELICAL RING |
| PRIMARY WASHER OUTSIDE DIAMETER | 0.209 INCHES NOMINAL |
| PRIMARY WASHER MATERIAL THICKNESS | 0.025 INCHES NOMINAL |
| SECONDARY WASHER RELATIONSHIP TO PRIMARY WASHER | NOT IDENTICAL |
| SECONDARY WASHER STYLE | FLAT |
| SECONDARY WASHER OUTSIDE DIAMETER | 0.213 INCHES NOMINAL |
| SECONDARY WASHER MATERIAL THICKNESS | 0.016 INCHES NOMINAL |
| SPECIFICATION/STANDARD DATA | 80205-NAS 720 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD |