| COUNTERSINK ANGLE | 108.0 DEGREES MINIMUM AND 112.0 DEGREES MAXIMUM NUT |
| FEATURES PROVIDED | CASEHARDENED |
| HARDNESS RATING | 24.0 ROCKWELL C MINIMUM AND 37.0 ROCKWELL C MAXIMUM |
| LOCKING FEATURE | PREVAILING TORQUE ALL METAL DESIGN |
| OVERALL HEIGHT | 0.495 INCHES MINIMUM AND 0.505 INCHES MAXIMUM |
| MATERIAL | STEEL OVERALL |
| NOMINAL THREAD SIZE | 0.500 INCHES |
| NUT STYLE | HEXAGON |
| SPECIAL FEATURES | 63 MICROINCH FINISH BEARING SURFACE,250 MICROINCH FINISH ON FLATS AND HEAD,0.020 IN. 45 DEGREE CHAMFER ON OD OF WASHER FACE |
| WASHER OUTSIDE DIAMETER | 0.865 INCHES MINIMUM AND 0.880 INCHES MAXIMUM |
| WASHER THICKNESS | 0.060 INCHES MINIMUM AND 0.080 INCHES MAXIMUM |
| WIDTH ACROSS FLATS | 0.736 INCHES MINIMUM AND 0.748 INCHES MAXIMUM |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-Z-325 TYPE 2 CLASS 3 FED SPEC 2ND TREATMENT RESPONSE OR QQ-Z-325 TYPE 2 CLASS 3 FED SPEC 3RD TREATMENT RESPONSE OVERALL |
| SURFACE TREATMENT | CADMIUM OR ZINC OR CHROMATE OVERALL |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD CLASS | 3B |
| THREAD SERIES | UNF |
| THREAD QUANTITY PER INCH | 20 |