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