| THREAD SERIES | UNJF |
| NOMINAL THREAD SIZE | 0.500 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 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 | 0.645 INCHES MAXIMUM |
| OVERALL HEIGHT | 0.583 INCHES NOMINAL |
| WASHER THICKNESS | 0.070 INCHES NOMINAL |
| WIDTH ACROSS FLATS | 0.558 INCHES MINIMUM AND |
| 0.566 INCHES MAXIMUM |
| LOCKING FEATURE | PREVAILING TORQUE ALL METAL DESIGN |
| PRECIOUS MATERIAL | SILVER |
| SPEC/STD CONTROLLING DATA | |
| MANUFACTURERS CODE | 81349 |
| NON-DEFINITIVE GOVERNMENT SPEC/STD REFERENCE | MIL-N-25027 |