| BEARING SURFACE FINISH | 125.0 MICROINCHES |
| COUNTERBORE DIAMETER | 0.299 INCHES MINIMUM AND 0.309 INCHES MAXIMUM NUT |
| MATERIAL | IRON ALLOY 660 NUT |
| NOMINAL THREAD SIZE | 0.250 INCHES |
| NUT COUNTERBORE DEPTH | 0.172 INCHES MINIMUM AND 0.192 INCHES MAXIMUM NUT |
| NUT STYLE | FLAT WITH TURNED BACK EDGE |
| OVERALL HEIGHT | 0.405 INCHES MINIMUM AND 0.425 INCHES MAXIMUM |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| SURFACE TREATMENT | PASSIVATE OVERALL |
| TEMP RATING | 450.0 FAHRENHEIT MAXIMUM |
| THREAD CLASS | 3B |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD QUANTITY PER INCH | 28 |
| THREAD SERIES | UNJF |
| WASHER OUTSIDE DIAMETER | 0.530 INCHES MINIMUM AND 0.560 INCHES MAXIMUM |
| WIDTH ACROSS FLATS | 0.430 INCHES MINIMUM AND 0.499 INCHES MAXIMUM |