| THREAD SERIES | UNJF |
| NOMINAL THREAD SIZE | 0.250 INCHES |
| THREAD QUANTITY PER INCH | 28 |
| THREAD CLASS | 3B |
| THREAD DIRECTION | RIGHT-HAND |
| MATERIAL | PLASTIC NYLON LOCKING INSERT |
| MATERIAL DOCUMENT AND CLASSIFICATION | AMS 5525 ASSN STD SINGLE MATERIAL RESPONSE OR |
| AMS 5532 ASSN STD SINGLE MATERIAL RESPONSE NUT |
| QQ-A-225/6,T4 FED SPEC 1ST MATERIAL RESPONSE OR |
| QQ-A-250/13,T6 FED SPEC 2ND MATERIAL RESPONSE WASHER |
| SURFACE TREATMENT | CADMIUM AND |
| CHROMATE NUT |
| CHROMATE WASHER |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-P-416,TY 2,CL 2 FED SPEC SINGLE TREATMENT RESPONSE NUT |
| MIL-C-5541 MIL SPEC SINGLE TREATMENT RESPONSE WASHER |
| NUT STYLE | FLAT WITH TURNED BACK EDGE |
| WASHER OUTSIDE DIAMETER | 0.530 INCHES MINIMUM AND |
| 0.560 INCHES MAXIMUM |
| OVERALL HEIGHT | 0.365 INCHES MINIMUM AND |
| 0.405 INCHES MAXIMUM |
| NUT HEIGHT | 0.193 INCHES MINIMUM AND |
| 0.213 INCHES MAXIMUM |
| WIDTH ACROSS FLATS | 0.430 INCHES MINIMUM AND |
| 0.439 INCHES MAXIMUM |
| LOCKING FEATURE | PREVAILING TORQUE WITH NONMETALLIC INSERT |
| NUT COUNTERBORE DEPTH | 0.172 INCHES MINIMUM AND |
| 0.192 INCHES MAXIMUM NUT |
| COUNTERBORE DIAMETER | 0.299 INCHES MINIMUM AND |
| 0.309 INCHES MAXIMUM NUT |
| TEMP RATING | 250.0 DEG FAHRENHEIT MAXIMUM |
| BEARING SURFACE FINISH | 125.0 MICROINCHES |