| COUNTERBORE DIAMETER | 0.385 INCHES MINIMUM AND 0.395 INCHES MAXIMUM NUT |
| LOCKING FEATURE | PREVAILING TORQUE ALL METAL DESIGN |
| OVERALL HEIGHT | 0.500 INCHES NOMINAL |
| MATERIAL | STEEL CORROSION RESISTING OVERALL |
| NOMINAL THREAD SIZE | 0.312 INCHES |
| NUT COUNTERBORE DEPTH | 0.231 INCHES MINIMUM AND 0.251 INCHES MAXIMUM NUT |
| NUT HEIGHT | 0.375 INCHES NOMINAL |
| NUT STYLE | FLAT WITH TURNED BACK EDGE |
| WASHER OUTSIDE DIAMETER | 0.620 INCHES NOMINAL |
| WIDTH ACROSS FLATS | 0.500 INCHES NOMINAL |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| SURFACE TREATMENT | PASSIVATE OVERALL |
| TEMP RATING | 450.0 FAHRENHEIT NOMINAL |
| THREAD CLASS | 3B |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD QUANTITY PER INCH | 24 |
| THREAD SERIES | UNIFIED NATIONAL JOINT FINE (UNJF) |