| FEATURES PROVIDED | CASEHARDENED |
| HARDNESS RATING | 78.0 ROCKWELL SUPERFICIAL 15-N MINIMUM AND 90.0 ROCKWELL SUPERFICIAL 15-N MAXIMUM |
| LOCKING FEATURE | PREVAILING TORQUE ALL METAL DESIGN |
| MATERIAL | STEEL OVERALL |
| III PART NAME ASSIGNED BY CONTROLLING AGENCY | NUT, SERRATED FLANGE LOCK |
| PROPRIETARY CHARACTERISTICS | PACS |
| NOMINAL THREAD SIZE | 0.312 INCHES |
| NUT STYLE | HEXAGON |
| OVERALL HEIGHT | 0.268 INCHES MINIMUM AND 0.283 INCHES MAXIMUM |
| SPECIAL FEATURES | SERRATED FLANGE LOCKING FEATURE |
| WASHER OUTSIDE DIAMETER | 0.660 INCHES MINIMUM AND 0.680 INCHES MAXIMUM |
| WASHER THICKNESS | 0.040 INCHES MINIMUM |
| WIDTH ACROSS FLATS | 0.489 INCHES MINIMUM AND 0.500 INCHES MAXIMUM |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | ASTM F1941, FE/ZN 5C ASSN STD SINGLE TREATMENT RESPONSE OVERALL |
| SURFACE TREATMENT | ZINC OVERALL |
| THREAD CLASS | 2B |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD QUANTITY PER INCH | 18 |
| THREAD SERIES | UNC |