| HARDNESS RATING | HRC 37-45 |
| MATERIAL DOCUMENT AND CLASSIFICATION | AMS 5731 OR AMS 5734 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| MATERIAL | STEEL CORROSION RESISTING OVERALL |
| NOMINAL THREAD SIZE | 0.250 INCHES |
| NUT HEIGHT | 0.307 INCHES MINIMUM AND 0.322 INCHES MAXIMUM |
| NUT STYLE | DOUBLE HEXAGON |
| PART NAME ASSIGNED BY CONTROLLING AGENCY | NUT, SELF-LOCKING, 12 POINT, REDUCED HEIGHT, SILVER PLATE, UNS S66286 |
| SPECIAL FEATURES | FINISH: SILVER PLATE PER AMS 2411; SILVER PLATE ONLY ON THE THREADS WITH OPTIONAL COVERAGE ON COUNTERSINK. DIMENTIONS APPLY AFTER PLATING. UPPER THREADED PORTION DEFORMED FOR LOCKING FEATURE, TOOL MARKS AND DISTORTION ARE PERMISSIBLE IN LOCKING AREA. |
| WIDTH ACROSS FLATS | 0.430 INCHES NOMINAL |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | AMS 2411 ASSN STD SINGLE TREATMENT RESPONSE OVERALL |
| THREAD CLASS | 3B |
| THREAD QUANTITY PER INCH | 28 |
| THREAD SERIES | UNJF |