| BEARING SURFACE TYPE | CHAMFERED OR WASHER FACED |
| CRITICALITY CODE JUSTIFICATION | FEAT |
| LOCKING FEATURE | PREVAILING TORQUE WITH NONMETALLIC INSERT |
| MATERIAL | STEEL COMP 1137 OVERALL |
| NOMINAL THREAD SIZE | 0.500 INCHES |
| NUT HEIGHT | 0.575 INCHES MINIMUM AND 0.610 INCHES MAXIMUM |
| NUT STYLE | HEXAGON |
| SPECIAL FEATURES | SAFETY CRITICAL THREAD PER FED STD H28/20 SYSTEM 22 |
| WIDTH ACROSS FLATS | 0.741 INCHES MINIMUM AND 0.752 INCHES MAXIMUM |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-P-416, TY2 CL3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| SURFACE TREATMENT | CADMIUM AND CHROMATE OVERALL |
| TEMP RATING | 450.0 FAHRENHEIT MAXIMUM |
| THREAD CLASS | 3B |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD QUANTITY PER INCH | 13 |
| THREAD SERIES | UNIFIED NATIONAL COARSE (UNC) |