| THREAD SERIES | UNJF |
| NOMINAL THREAD SIZE | 0.438 INCHES |
| THREAD QUANTITY PER INCH | 20 |
| THREAD CLASS | 3B |
| THREAD DIRECTION | RIGHT-HAND |
| MATERIAL | IRON ALLOY 660 NUT |
| STEEL COMP 302 WASHER |
| MATERIAL DOCUMENT AND CLASSIFICATION | AMS 5731 ASSN STD SINGLE MATERIAL RESPONSE OR |
| AMS 5737 ASSN STD SINGLE MATERIAL RESPONSE NUT |
| MIL-S-5059 MIL SPEC SINGLE MATERIAL RESPONSE WASHER |
| SURFACE TREATMENT | PASSIVATE OVERALL |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| NUT STYLE | FLAT WITH TURNED BACK EDGE |
| WASHER OUTSIDE DIAMETER | 0.785 INCHES MAXIMUM |
| OVERALL HEIGHT | 0.530 INCHES MINIMUM AND |
| 0.550 INCHES MAXIMUM |
| NUT HEIGHT | 0.281 INCHES NOMINAL |
| WIDTH ACROSS FLATS | 0.616 INCHES MINIMUM AND |
| 0.627 INCHES MAXIMUM |
| NUT COUNTERBORE DEPTH | 0.249 INCHES MINIMUM AND |
| 0.269 INCHES MAXIMUM FIRST END |
| COUNTERBORE DIAMETER | 0.519 INCHES MINIMUM AND |
| 0.529 INCHES MAXIMUM FIRST END |
| TEMP RATING | 450.0 DEG FAHRENHEIT MAXIMUM |