| BEARING SURFACE TYPE | CHAMFERED |
| COUNTERSINK ANGLE | 90.0 DEGREES NOMINAL NUT |
| FEATURES PROVIDED | CASEHARDENED |
| HARDNESS RATING | 26.0 ROCKWELL C MINIMUM AND 30.0 ROCKWELL C MAXIMUM |
| LOCKING FEATURE | FREE-RUNNING ALL METAL DESIGN |
| MATERIAL DOCUMENT AND CLASSIFICATION | 66 FED STD ALL MATERIAL RESPONSES OVERALL |
| MATERIAL | STEEL COMP 1035 OR STEEL COMP 1038 OR STEEL COMP 1040 OR STEEL COMP 1042 OR STEEL COMP 1045 OR STEEL COMP 1140 OVERALL |
| NOMINAL THREAD SIZE | 0.375 INCHES |
| NUT HEIGHT | 0.453 INCHES MINIMUM AND 0.469 INCHES MAXIMUM |
| NUT STYLE | HEXAGON |
| SPECIAL FEATURES | APPLY ANTI-SEIZE COMPOUND TO THREADS PER MILA13881 |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-Z-325,TY 2,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| SURFACE TREATMENT | ZINC OVERALL |
| THREAD CLASS | 2B |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD QUANTITY PER INCH | 24 |
| THREAD SERIES | UNF |
| WIDTH ACROSS FLATS | 0.553 INCHES MINIMUM AND 0.564 INCHES MAXIMUM |