| COUNTERBORE DIAMETER | 0.548 INCHES MINIMUM AND 0.578 INCHES MAXIMUM NUT |
| DISTANCE FROM CENTERLINE OF THREADED HOLE TO END OF NUT | 0.424 INCHES MINIMUM AND 0.434 INCHES MAXIMUM |
| HARDNESS RATING | 26.0 ROCKWELL C MINIMUM AND 32.0 ROCKWELL C MAXIMUM |
| MATERIAL DOCUMENT AND CLASSIFICATION | 66 FED STD SINGLE MATERIAL RESPONSE OR AMS 6370 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| MATERIAL | STEEL COMP 4130 OVERALL |
| NOMINAL THREAD SIZE | 0.500 INCHES |
| NUT COUNTERBORE DEPTH | 0.098 INCHES MINIMUM AND 0.128 INCHES MAXIMUM NUT |
| NUT DIAMETER | 0.863 INCHES MINIMUM AND 0.866 INCHES MAXIMUM |
| NUT STYLE | PLAIN BARREL |
| NUT LENGTH | 0.844 INCHES MINIMUM AND 0.874 INCHES MAXIMUM |
| PART NAME ASSIGNED BY CONTROLLING AGENCY | NAVY SPECIAL PROJECT |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-P-416,TY 1,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| SURFACE TREATMENT | CADMIUM OVERALL |
| THREAD CLASS | 3B |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD QUANTITY PER INCH | 20 |
| THREAD SERIES | UNF |