| CONCENTRIC HOLE DIAMETER | 0.781 INCHES MINIMUM AND 0.782 INCHES MAXIMUM |
| COUNTERBORE DEPTH | 0.435 INCHES NOMINAL |
| COUNTERBORE DIAMETER | 0.437 INCHES MINIMUM AND 0.440 INCHES MAXIMUM |
| FASTENER LENGTH | 1.860 INCHES MINIMUM AND 1.890 INCHES MAXIMUM |
| HEAD HEIGHT | 1.435 INCHES NOMINAL |
| HEAD STYLE | HEXAGON |
| MATERIAL DOCUMENT AND CLASSIFICATION | QQ-N-281 CL A FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| MATERIAL | NICKEL ALLOY 400 OVERALL |
| NOMINAL THREAD DIAMETER | 1.125 INCHES |
| SPECIAL FEATURES | COUNTERBORE DIAMETER 0.781 INCHES MIN AND 0.782 INCHES MAX LENGTH IS 1.425 INCHES MIN AND 1.455 INCHES MAX |
| WIDTH BETWEEN FLATS | 1.250 INCHES NOMINAL |
| STYLE DESIGNATOR | COUNTERBORE UNTHREADED |
| THREAD CLASS | 2A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 0.425 INCHES MINIMUM AND 0.455 INCHES MAXIMUM |
| THREAD QUANTITY PER INCH | 12 |
| THREAD SERIES DESIGNATOR | UNF |