| THREAD SERIES DESIGNATOR | UNC |
| NOMINAL THREAD DIAMETER | 0.250 INCHES |
| THREAD QUANTITY PER INCH | 20 |
| THREAD CLASS | 2A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 0.750 INCHES MINIMUM |
| FASTENER LENGTH | 3.500 INCHES NOMINAL |
| MATERIAL | STEEL OVERALL |
| MATERIAL DOCUMENT AND CLASSIFICATION | FF-B-571 FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| SURFACE TREATMENT | CADMIUM OR |
| ZINC OVERALL |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-P-416 FED SPEC 1ST TREATMENT RESPONSE OR |
| QQ-Z-325 FED SPEC 2ND TREATMENT RESPONSE OVERALL |
| HEAD STYLE | BUTTON |
| HEAD DIAMETER | 0.563 INCHES NOMINAL |
| HEAD HEIGHT | 0.125 INCHES NOMINAL |
| NECK LENGTH | 0.219 INCHES NOMINAL |
| NECK WIDTH | 0.250 INCHES NOMINAL |
| FEATURES PROVIDED | SQUARE NUT |
| NONDEFINITIVE SPEC/STD DATA | C2 TYPE |
| SPEC/STD CONTROLLING DATA | |
| NON-DEFINITIVE GOVERNMENT SPEC/STD REFERENCE | FFB571 |
| MANUFACTURERS CODE | 81348 |
| DEFINITIVE GOVERNMENT SPEC/STD REFERENCE | FFB571TYPEC2CLASSC |