| BEARING SURFACE FINISH | 125.0 MICROINCHES |
| BEARING SURFACE TYPE | CHAMFERED OR WASHER FACED |
| COUNTERSINK ANGLE | 88.0 DEGREES NOMINAL NUT |
| LOCKING FEATURE | PREVAILING TORQUE WITH NONMETALLIC INSERT |
| MATERIAL DOCUMENT AND CLASSIFICATION | 66 FED STD SINGLE MATERIAL RESPONSE NUT |
| MATERIAL DOCUMENT AND CLASSIFICATION | MIL-M-20693 COMDITION A, TYPE 1, MIL SPEC SINGLE MATERIAL RESPONSE LOCKING INSERT |
| MATERIAL | PLASTIC POLYHEXAMETHYLENE AMIDE LOCKING INSERT |
| MATERIAL | STEEL COMP 1137 NUT |
| NOMINAL THREAD SIZE | 0.312 INCHES |
| NUT HEIGHT | 0.271 INCHES MINIMUM AND 0.360 INCHES MAXIMUM |
| NUT STYLE | HEXAGON |
| PART NAME ASSIGNED BY CONTROLLING AGENCY | NUT, SELF-LOCKING, HEXAGON |
| WIDTH ACROSS FLATS | 0.492 INCHES MINIMUM AND 0.502 INCHES MAXIMUM |
| TEMP RATING | 250.0 FAHRENHEIT NOMINAL |
| THREAD CLASS | 3B |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD SERIES | UNIFIED NATIONAL COARSE (UNC) |
| THREAD QUANTITY PER INCH | 18 |