| COUNTERBORE DIAMETER | 0.413 INCHES MINIMUM AND 0.423 INCHES MAXIMUM NUT |
| HARDNESS RATING | 36.0 ROCKWELL C MINIMUM AND 40.0 ROCKWELL C MAXIMUM |
| LOCKING FEATURE | PREVAILING TORQUE ALL METAL DESIGN |
| OVERALL HEIGHT | 0.351 INCHES NOMINAL |
| MATERIAL | STEEL COMP 4340 OVERALL |
| NOMINAL THREAD SIZE | 0.3750 INCHES |
| NUT STYLE | FLAT WITH TURNED UP EDGE |
| SPECIAL FEATURES | DOUBLE HEXAGON WRENCHING ELEMENT |
| WASHER OUTSIDE DIAMETER | 0.660 INCHES MAXIMUM |
| WIDTH ACROSS FLATS | 0.430 INCHES MINIMUM AND 0.439 INCHES MAXIMUM |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-P-416 TY 2 CL 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| SURFACE TREATMENT | CADMIUM AND CHROMATE OVERALL |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD CLASS | 3B |
| THREAD SERIES | UNJF |
| THREAD QUANTITY PER INCH | 24 |