| COUNTERBORE DIAMETER | 0.154 INCHES MINIMUM AND 0.159 INCHES MAXIMUM BOSS |
| MATERIAL DOCUMENT AND CLASSIFICATION | QQ-A-225/5,TY 4 FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| MATERIAL | ALUMINUM ALLOY OVERALL |
| NOMINAL THREAD SIZE | 0.138 INCHES |
| NUT COUNTERBORE DEPTH | 0.276 INCHES MINIMUM AND 0.286 INCHES MAXIMUM BOSS |
| NUT DIAMETER | 0.307 INCHES MINIMUM AND 0.317 INCHES MAXIMUM |
| NUT HEIGHT | 0.424 INCHES NOMINAL |
| NUT STYLE | CLINCH |
| PILOT LENGTH | 0.050 INCHES MINIMUM AND 0.060 INCHES MAXIMUM |
| PILOT DIAMETER | 0.215 INCHES MINIMUM AND 0.220 INCHES MAXIMUM |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | MIL-C-5541 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL |
| SURFACE TREATMENT | OXIDE FILM OVERALL |
| THREAD CLASS | 2B |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD QUANTITY PER INCH | 32 |
| THREAD SERIES | UNIFIED NATIONAL COARSE (UNC) |