| BASE THICKNESS | 0.050 INCHES MINIMUM AND 0.064 INCHES MAXIMUM |
| BASE WIDTH | 0.395 INCHES MINIMUM AND 0.405 INCHES MAXIMUM |
| COUNTERBORE DIAMETER | 0.317 INCHES NOMINAL NUT |
| LOCKING FEATURE | PREVAILING TORQUE ALL METAL DESIGN |
| LUBRICATION | DRY FILM LUBRICANT |
| MATERIAL DOCUMENT AND CLASSIFICATION | AMS 5525 ASSN STD SINGLE MATERIAL RESPONSE OR AMS 5662 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| MATERIAL | IRON ALLOY 660 OR NICKEL ALLOY 718 OVERALL |
| PART NAME ASSIGNED BY CONTROLLING AGENCY | NUT ELEMENT |
| NOMINAL THREAD SIZE | 0.3125 INCHES |
| NUT COUNTERBORE DEPTH | 0.041 INCHES MINIMUM NUT |
| NUT HEIGHT | 0.287 INCHES MAXIMUM |
| NUT LENGTH | 0.722 INCHES MINIMUM AND 0.732 INCHES MAXIMUM |
| NUT STYLE | GANG CHANNEL, SELF LOCKING |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | ASTM A967 ASSN STD SINGLE TREATMENT RESPONSE OR AMS 2700 ASSN STD SINGLE TREATMENT RESPONSE OVERALL |
| SURFACE TREATMENT | PASSIVATE OVERALL |
| THREAD CLASS | 3B |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD QUANTITY PER INCH | 24 |
| THREAD SERIES | UNIFIED NATIONAL JOINT FINE (UNJF) |