| COUNTERSINK ANGLE | 90.0 DEGREES NOMINAL FIRST END |
| MATERIAL | STEEL COMP 303 OR STEEL COMP 303SE OR STEEL COMP 416 OR STEEL COMP 416SE OR STEEL COMP 420F OR STEEL COMP 430F OR STEEL COMP 430FSE OR STEEL COMP 440F OVERALL |
| PILOT DIAMETER | 0.366 INCHES MINIMUM AND 0.369 INCHES MAXIMUM |
| PILOT LENGTH | 0.120 INCHES MINIMUM AND 0.130 INCHES MAXIMUM |
| NOMINAL THREAD SIZE | 0.250 INCHES |
| NUT DIAMETER | 0.497 INCHES MINIMUM AND 0.503 INCHES MAXIMUM |
| NUT HEIGHT | 0.427 INCHES MINIMUM AND 0.447 INCHES MAXIMUM |
| NUT STYLE | SPLINE |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-P-35,TY 4 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| SURFACE TREATMENT | PASSIVATE OVERALL |
| THREAD CLASS | 2B |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD QUANTITY PER INCH | 20 |
| THREAD SERIES | UNIFIED NATIONAL COARSE (UNC) |