| COUNTERBORE DIAMETER | 0.485 INCHES MINIMUM AND 0.515 INCHES MAXIMUM NUT |
| COUNTERSINK ANGLE | 80.0 DEGREES MINIMUM AND 120.0 DEGREES MAXIMUM NUT |
| MATERIAL DOCUMENT AND CLASSIFICATION | QQ-S-764,COND A FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| MATERIAL | STEEL COMP 303 OVERALL |
| NOMINAL THREAD SIZE | 0.312 INCHES |
| NUT COUNTERBORE DEPTH | 0.190 INCHES MINIMUM AND 0.220 INCHES MAXIMUM NUT |
| NUT DIAMETER | 0.750 INCHES NOMINAL |
| NUT STYLE | SPLINE |
| NUT HEIGHT | 0.730 INCHES MINIMUM AND 0.760 INCHES MAXIMUM |
| PILOT LENGTH | 0.230 INCHES MINIMUM AND 0.270 INCHES MAXIMUM |
| PILOT DIAMETER | 0.630 INCHES MINIMUM AND 0.640 INCHES MAXIMUM |
| SURFACE TREATMENT | PASSIVATE OVERALL |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD CLASS | 2B |
| THREAD SERIES | UNC |
| THREAD QUANTITY PER INCH | 18 |