| BEARING SURFACE TYPE | CHAMFERED |
| LOCKING FEATURE | PREVAILING TORQUE WITH NONMETALLIC INSERT |
| MATERIAL DOCUMENT AND CLASSIFICATION | SAE-J995 GRADE 8 ASSN STD 1ST MATERIAL RESPONSE OVERALL EXCEPT INSERT |
| MATERIAL | STEEL OVERALL EXCEPT INSERT |
| NOMINAL THREAD SIZE | 0.250 INCHES |
| NUT HEIGHT | 0.298 INCHES MINIMUM AND 0.328 INCHES MAXIMUM |
| NUT STYLE | HEXAGON |
| WIDTH ACROSS FLATS | 0.428 INCHES MINIMUM AND 0.439 INCHES MAXIMUM |
| SPECIFICATION/STANDARD DATA | 81349-MIL-DTL 45913/1 GOVERNMENT SPECIFICATION |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-P-416 TYPE 2 CLASS 2 OR 3 FED SPEC 1ST TREATMENT RESPONSE OVERALL EXCEPT INSERT |
| SURFACE TREATMENT | ZINC OVERALL EXCEPT INSERT |
| TEMP RATING | 250.0 FAHRENHEIT NOMINAL |
| THREAD CLASS | 2B |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD QUANTITY PER INCH | 20 |
| THREAD SERIES | UNIFIED NATIONAL COARSE (UNC) |