| DISTANCE FROM CENTERLINE TO FLAT | 0.186 INCHES MINIMUM AND 0.189 INCHES MAXIMUM |
| MATERIAL DOCUMENT AND CLASSIFICATION | QQ-S-633-CANC FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| MATERIAL | STEEL OVERALL |
| NOMINAL THREAD SIZE | 0.250 INCHES |
| NUT HEIGHT | 0.442 INCHES NOMINAL |
| NUT STYLE | CLINCH |
| PILOT LENGTH | 0.172 INCHES MINIMUM AND 0.192 INCHES MAXIMUM |
| PILOT WIDTH | 0.372 INCHES MINIMUM AND 0.378 INCHES MAXIMUM |
| SURFACE TREATMENT | CADMIUM OR ZINC OVERALL |
| THREAD CLASS | 2B |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD QUANTITY PER INCH | 20 |
| THREAD SERIES | UNIFIED NATIONAL COARSE (UNC) |
| WIDTH ACROSS FLATS | 0.518 INCHES MINIMUM AND 0.527 INCHES MAXIMUM |