| BEARING SURFACE TYPE | FLAT |
| PART NAME ASSIGNED BY CONTROLLING AGENCY | HEX NUT |
| MATERIAL DOCUMENT AND CLASSIFICATION | QQ-N-281,CLASS B/ASTM F467, AS FORMED OR STRESS RELIEVED FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| MATERIAL | NICKEL ALLOY R-405 OVERALL |
| NOMINAL THREAD SIZE | 0.625 INCHES |
| NUT HEIGHT | 0.535 INCHES MINIMUM AND 0.559 INCHES MAXIMUM |
| NUT STYLE | HEXAGON |
| SPECIFICATION/STANDARD DATA | 81349-MIL-DTL-1222J GOVERNMENT SPECIFICATION |
| THREAD CLASS | 2B |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD QUANTITY PER INCH | 11 |
| THREAD SERIES | UNIFIED NATIONAL COARSE (UNC) |
| WIDTH ACROSS FLATS | 0.922 INCHES MINIMUM AND 0.938 INCHES MAXIMUM |