| THREAD SERIES DESIGNATOR | UNC |
| NOMINAL THREAD DIAMETER | 0.112 INCHES |
| THREAD QUANTITY PER INCH | 40 |
| THREAD CLASS | 2A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 0.293 INCHES MINIMUM AND |
| 0.375 INCHES MAXIMUM |
| FASTENER LENGTH | 0.343 INCHES MINIMUM AND |
| 0.375 INCHES MAXIMUM |
| MATERIAL | COPPER ALLOY 260 OR |
| COPPER ALLOY 268 SECONDARY WASHER |
| COPPER ALLOY 510 PRIMARY WASHER |
| COPPER ALLOY FASTENER |
| MATERIAL DOCUMENT AND CLASSIFICATION | QQ-B-613 FED SPEC ALL MATERIAL RESPONSES SECONDARY WASHER |
| QQ-B-750 FED SPEC SINGLE MATERIAL RESPONSE PRIMARY WASHER |
| QQ-B-613 FED SPEC SINGLE MATERIAL RESPONSE OR |
| QQ-B-626 FED SPEC SINGLE MATERIAL RESPONSE FASTENER |
| SURFACE TREATMENT | NICKEL OVERALL |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-N-290 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| MINIMUM TENSILE STRENGTH | 55000 POUNDS PER SQUARE INCH |
| HEAD STYLE | PAN NO. 2 |
| HEAD DIAMETER | 0.205 INCHES MINIMUM AND |
| 0.219 INCHES MAXIMUM |
| HEAD HEIGHT | 0.058 INCHES MINIMUM AND |
| 0.068 INCHES MAXIMUM |
| INTERNAL DRIVE STYLE | SLOT |
| WASHER QUANTITY | 2 |
| PRIMARY WASHER STYLE | SPLIT HELICAL RING |
| PRIMARY WASHER OUTSIDE DIAMETER | 0.209 INCHES MAXIMUM |
| PRIMARY WASHER MATERIAL THICKNESS | 0.025 INCHES MINIMUM AND |
| 0.031 INCHES MAXIMUM |
| SECONDARY WASHER RELATIONSHIP TO PRIMARY WASHER | NOT IDENTICAL |
| SECONDARY WASHER STYLE | FLAT |
| SECONDARY WASHER OUTSIDE DIAMETER | 0.213 INCHES MINIMUM AND |
| 0.223 INCHES MAXIMUM |
| SECONDARY WASHER MATERIAL THICKNESS | 0.013 INCHES MINIMUM AND |
| 0.019 INCHES MAXIMUM |
| SPECIFICATION/STANDARD DATA | 80205-NAS720 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD |