| COUNTERBORE DIAMETER | 0.370 INCHES MINIMUM AND 0.380 INCHES MAXIMUM BOSS |
| COUNTERBORE DIAMETER | 0.312 INCHES MINIMUM AND 0.317 INCHES MAXIMUM FLANGE |
| MATERIAL DOCUMENT AND CLASSIFICATION | ASTM A581 ASSN STD ALL MATERIAL RESPONSES OVERALL |
| MATERIAL | STEEL COMP 303 OR STEEL COMP 303SE OR STEEL COMP 416 OR STEEL COMP 416SE OR STEEL COMP 430F OR STEEL COMP 430FSE OVERALL |
| NOMINAL THREAD SIZE | 0.250 INCHES |
| NUT COUNTERBORE DEPTH | 0.088 INCHES MINIMUM AND 0.096 INCHES MAXIMUM FLANGE |
| NUT COUNTERBORE DEPTH | 0.395 INCHES MINIMUM AND 0.405 INCHES MAXIMUM BOSS |
| NUT HEIGHT | 0.615 INCHES MINIMUM AND 0.635 INCHES MAXIMUM |
| NUT DIAMETER | 0.528 INCHES MINIMUM AND 0.534 INCHES MAXIMUM |
| NUT STYLE | CLINCH |
| PILOT LENGTH | 0.088 INCHES MINIMUM AND 0.098 INCHES MAXIMUM |
| PILOT DIAMETER | 0.430 INCHES MINIMUM AND 0.433 INCHES MAXIMUM |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| SURFACE TREATMENT | PASSIVATE OVERALL |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD CLASS | 2B |
| THREAD SERIES | UNC |
| THREAD QUANTITY PER INCH | 20 |