| BEARING SURFACE TYPE | CHAMFERED OR WASHER FACED |
| COUNTERBORE DIAMETER | 1.427 INCHES MINIMUM AND 1.467 INCHES MAXIMUM FIRST END |
| COUNTERSINK ANGLE | 88.0 DEGREES MINIMUM SECOND END |
| LOCKING FEATURE | PREVAILING TORQUE WITH NONMETALLIC INSERT |
| MATERIAL DOCUMENT AND CLASSIFICATION | QQ-N-281, CLASS A FED SPEC SINGLE MATERIAL RESPONSE OVERALL EXCEPT INSERT |
| MATERIAL | NICKEL ALLOY OVERALL EXCEPT INSERT |
| MATERIAL | PLASTIC POLYAMIDE (NYLON) LOCKING INSERT |
| NOMINAL THREAD SIZE | 1.375 INCHES |
| NUT HEIGHT | 1.547 INCHES MINIMUM AND 1.609 INCHES MAXIMUM |
| NUT STYLE | HEXAGON |
| TEMP RATING | 250.0 FAHRENHEIT NOMINAL |
| THREAD CLASS | 3B |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD QUANTITY PER INCH | 12 |
| THREAD SERIES | UNF |
| WIDTH ACROSS FLATS | 1.973 INCHES MINIMUM AND 2.011 INCHES MAXIMUM |