| BEARING SURFACE TYPE | CHAMFERED OR WASHER FACED |
| COUNTERBORE DIAMETER | 1.798 INCHES MINIMUM AND 1.838 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 FED SPEC SINGLE MATERIAL RESPONSE OVERALL EXCEPT INSERT |
| MATERIAL | NICKEL ALLOY 400 OR NICKEL ALLOY R-405 OVERALL EXCEPT INSERT |
| MATERIAL | PLASTIC POLYAMIDE NYLON LOCKING INSERT |
| NOMINAL THREAD SIZE | 1.750 INCHES |
| NUT STYLE | HEXAGON |
| NUT HEIGHT | 2.250 INCHES MINIMUM AND 2.376 INCHES MAXIMUM |
| SPECIAL FEATURES | NICKEL ALLOY 400 IS CLASS A AND NICKEL ALLOY 405 IS CLASS B |
| WIDTH ACROSS FLATS | 2.715 INCHES MINIMUM AND 2.766 INCHES MAXIMUM |
| TEMP RATING | 250.0 FAHRENHEIT NOMINAL |
| THREAD CLASS | 3B |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD SERIES | UNIFIED NATIONAL COARSE (UNC) |
| THREAD QUANTITY PER INCH | 5 |