| COUNTERSINK ANGLE | 90.0 DEGREES NOMINAL NUT |
| HARDNESS RATING | 30.0 ROCKWELL C MINIMUM AND 35.0 ROCKWELL C MAXIMUM |
| OVERALL HEIGHT | 0.320 INCHES MINIMUM AND 0.340 INCHES MAXIMUM |
| MATERIAL DOCUMENT AND CLASSIFICATION | 66 FED STD 1ST MATERIAL RESPONSE OR AMS 6322 ASSN STD 2ND MATERIAL RESPONSE OVERALL |
| MATERIAL | STEEL COMP 1030 OR STEEL COMP 8740 OVERALL |
| NOMINAL THREAD SIZE | 0.438 INCHES |
| NUT STYLE | HEXAGON |
| WASHER OUTSIDE DIAMETER | 0.680 INCHES MINIMUM AND 0.700 INCHES MAXIMUM |
| WASHER THICKNESS | 0.050 INCHES MINIMUM AND 0.070 INCHES MAXIMUM |
| WIDTH ACROSS FLATS | 0.560 INCHES MINIMUM AND 0.565 INCHES MAXIMUM |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | AMS 2400 ASSN STD SINGLE TREATMENT RESPONSE OVERALL |
| SURFACE TREATMENT | CADMIUM OVERALL |
| THREAD CLASS | 3B |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD QUANTITY PER INCH | 20 |
| THREAD SERIES | UNF |