| THREAD SERIES | UNJF |
| NOMINAL THREAD SIZE | 0.4375 INCHES |
| THREAD QUANTITY PER INCH | 20 |
| THREAD CLASS | 3B |
| THREAD DIRECTION | RIGHT-HAND |
| MATERIAL | IRON ALLOY 660 OVERALL |
| MATERIAL DOCUMENT AND CLASSIFICATION | AMS 5525 ASSN STD SINGLE MATERIAL RESPONSE OR |
| AMS 5731 ASSN STD SINGLE MATERIAL RESPONSE OR |
| AMS 5732 ASSN STD SINGLE MATERIAL RESPONSE OR |
| AMS 5737 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| SURFACE TREATMENT | PASSIVATE OVERALL |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-P-35,TY II OR TY VIII FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| NUT STYLE | HEXAGON |
| WASHER OUTSIDE DIAMETER | 0.720 INCHES MAXIMUM |
| OVERALL HEIGHT | 0.313 INCHES MINIMUM AND |
| 0.328 INCHES MAXIMUM |
| WASHER THICKNESS | 0.040 INCHES MINIMUM |
| WIDTH ACROSS FLATS | 0.494 INCHES MINIMUM AND |
| 0.505 INCHES MAXIMUM |
| LOCKING FEATURE | PREVAILING TORQUE ALL METAL DESIGN |
| TEMP RATING | 450.0 DEG FAHRENHEIT NOMINAL |