| THREAD SERIES | UNF |
| NOMINAL THREAD SIZE | 0.250 INCHES |
| THREAD QUANTITY PER INCH | 28 |
| THREAD CLASS | 3B |
| THREAD DIRECTION | RIGHT-HAND |
| MATERIAL | IRON ALLOY 660 NUT |
| IRON ALLOY 660 WASHER |
| MATERIAL DOCUMENT AND CLASSIFICATION | AMS 5525 ASSN STD SINGLE MATERIAL RESPONSE NUT |
| AMS 5732 ASSN STD SINGLE MATERIAL RESPONSE WASHER |
| SURFACE TREATMENT | SILVER NUT |
| PASSIVATE WASHER |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | AMS 2410 ASSN STD SINGLE TREATMENT RESPONSE NUT |
| HARDNESS RATING | 32.0 ROCKWELL C MINIMUM AND |
| 48.0 ROCKWELL C MAXIMUM |
| NUT STYLE | HEXAGON |
| WASHER OUTSIDE DIAMETER | 0.439 INCHES MINIMUM AND |
| 0.464 INCHES MAXIMUM |
| OVERALL HEIGHT | 0.215 INCHES MINIMUM AND |
| 0.245 INCHES MAXIMUM |
| WASHER THICKNESS | 0.013 INCHES MINIMUM |
| WIDTH ACROSS FLATS | 0.305 INCHES MINIMUM AND |
| 0.313 INCHES MAXIMUM |
| LOCKING FEATURE | PREVAILING TORQUE ALL METAL DESIGN |
| NUT COUNTERBORE DEPTH | 0.129 INCHES MINIMUM NUT |
| COUNTERBORE DIAMETER | 0.286 INCHES MINIMUM AND |
| 0.296 INCHES MAXIMUM NUT |
| LUBRICATION | SOLUBLE LUBRICANT |
| TEMP RATING | 900.0 DEG FAHRENHEIT NOMINAL |
| PRECIOUS MATERIAL AND LOCATION | EXTERNAL SURFACE SILVER |