| BEARING SURFACE TYPE | CHAMFERED OR WASHER FACED |
| NUT HEIGHT | 0.298 INCHES MINIMUM AND 0.328 INCHES MAXIMUM |
| NUT STYLE | HEXAGON |
| LOCKING FEATURE | PREVAILING TORQUE WITH NONMETALLIC INSERT |
| MATERIAL DOCUMENT AND CLASSIFICATION | SAE J995 GRADE 8 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| MATERIAL | STEEL OVERALL |
| NOMINAL THREAD SIZE | 0.250 INCHES |
| PART NAME ASSIGNED BY CONTROLLING AGENCY | NUT, SELF-LOCKING, HEXAGON, NON-METALLIC LOCKING FEATURE |
| WIDTH ACROSS FLATS | 0.428 INCHES MINIMUM AND 0.439 INCHES MAXIMUM |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | ASTM B633 TY II. FE/ZN 8 ASSN STD SINGLE TREATMENT RESPONSE OVERALL |
| SURFACE TREATMENT | ZINC OVERALL |
| TEMP RATING | 250.0 DEG FAHRENHEIT NOMINAL |
| THREAD CLASS | 3B |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD QUANTITY PER INCH | 28 |
| THREAD SERIES | UNF |