| HARDNESS RATING | 19.0 ROCKWELL C MINIMUM AND 26.0 ROCKWELL C MAXIMUM |
| LOCKING FEATURE | PREVAILING TORQUE ALL METAL DESIGN |
| OVERALL HEIGHT | 0.428 INCHES MINIMUM AND 0.448 INCHES MAXIMUM |
| MATERIAL DOCUMENT AND CLASSIFICATION | AMS 6320 ASSN STD 1ST MATERIAL RESPONSE OR AMS 4140 ASSN STD 2ND MATERIAL RESPONSE OVERALL |
| MATERIAL | STEEL COMP 8735 OR STEEL COMP 4140 OVERALL |
| NOMINAL THREAD SIZE | 0.375 INCHES |
| NUT STYLE | HEXAGON |
| WASHER OUTSIDE DIAMETER | 0.646 INCHES MINIMUM AND 0.666 INCHES MAXIMUM |
| WASHER THICKNESS | 0.084 INCHES MINIMUM AND 0.104 INCHES MAXIMUM |
| WIDTH ACROSS FLATS | 0.556 INCHES MINIMUM AND 0.563 INCHES MAXIMUM |
| THREAD CLASS | 3B |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD QUANTITY PER INCH | 24 |
| THREAD SERIES | UNF |