| THREAD SERIES | UNJF |
| NOMINAL THREAD SIZE | 0.625 INCHES |
| THREAD QUANTITY PER INCH | 18 |
| THREAD CLASS | 3B |
| THREAD DIRECTION | RIGHT-HAND |
| MATERIAL | IRON ALLOY 660 OVERALL |
| MATERIAL DOCUMENT AND CLASSIFICATION | MS 5525 ASSN STD SINGLE MATERIAL RESPONSE OR |
| AMS 5732 ASSN STD SINGLE MATERIAL RESPONSE OR |
| AMS 5737 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| SURFACE TREATMENT | SILVER OVERALL |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | AMS 2410 ASSN STD SINGLE TREATMENT RESPONSE OR |
| AMS 2411 ASSN STD SINGLE TREATMENT RESPONSE OVERALL |
| HARDNESS RATING | 46.0 ROCKWELL C MAXIMUM |
| NUT STYLE | CASTELLATED HEXAGON |
| WASHER OUTSIDE DIAMETER | 0.850 INCHES MAXIMUM |
| OVERALL HEIGHT | 0.313 INCHES NOMINAL |
| WASHER THICKNESS | 0.045 INCHES NOMINAL |
| WIDTH ACROSS FLATS | 0.680 INCHES MINIMUM AND |
| 0.692 INCHES MAXIMUM |
| LOCKING FEATURE | PREVAILING TORQUE ALL METAL DESIGN |
| TEMP RATING | 800.0 DEG FAHRENHEIT MAXIMUM |
| PRECIOUS MATERIAL | SILVER |
| PRECIOUS MATERIAL AND LOCATION | EXTERNALS SURFACE SILVER |
| BEARING SURFACE FINISH | 125.0 MICROINCHES |