| BEARING SURFACE TYPE | CHAMFERED OR WASHER FACED |
| COUNTERSINK ANGLE | 89.5 DEGREES MINIMUM AND 90.5 DEGREES MAXIMUM NUT |
| LOCKING FEATURE | PREVAILING TORQUE WITH NONMETALLIC INSERT |
| MATERIAL DOCUMENT AND CLASSIFICATION | QQ-A-225/4 FED SPEC 1ST MATERIAL RESPONSE OR QQ-A-225/6 FED SPEC 2ND MATERIAL RESPONSE OVERALL EXCEPT INSERT |
| MATERIAL | ALUMINUM ALLOY 7075 OR ALUMINUM ALLOY 2024 OVERALL EXCEPT INSERT |
| MATERIAL | PLASTIC POLYAMIDE (NYLON) LOCKING INSERT |
| NOMINAL THREAD SIZE | 1.625 INCHES |
| NUT HEIGHT | 0.391 INCHES MINIMUM AND 0.422 INCHES MAXIMUM |
| NUT STYLE | HEXAGON |
| WIDTH ACROSS FLATS | 1.922 INCHES MINIMUM AND 1.954 INCHES MAXIMUM |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | MIL-A-8625,TYPE2,CLASS 2 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL EXCEPT INSERT |
| SURFACE TREATMENT | ANODIZE OVERALL EXCEPT INSERT |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD CLASS | 3B |
| THREAD SERIES | UN |
| THREAD QUANTITY PER INCH | 12 |