| COUNTERBORE DIAMETER | 0.255 INCHES MINIMUM AND 0.258 INCHES MAXIMUM OVERALL EXCEPT THREADS |
| HEAD HEIGHT | 0.040 INCHES NOMINAL |
| HEAD MAJOR COUNTERSINK ANGLE | 75.0 DEGREES MINIMUM AND 77.0 DEGREES MAXIMUM |
| HEAD MAJOR DIAMETER | 0.4176 INCHES MINIMUM AND 0.4400 INCHES MAXIMUM |
| HEAD MINOR COUNTERSINK ANGLE | 59.0 DEGREES MINIMUM AND 61.0 DEGREES MAXIMUM |
| HEAD MINOR DIAMETER | 0.3500 INCHES MINIMUM |
| HEAD STYLE | ELIPTICAL COUNTERSUNK |
| LOCKING FEATURE | PREVAILING TORQUE ALL METAL DESIGN |
| LUBRICATION | DRY FILM LUBRICANT |
| MATERIAL DOCUMENT AND CLASSIFICATION | QQ-S-763,COND A FED SPEC ALL MATERIAL RESPONSES OVERALL |
| MATERIAL | STEEL COMP 304 OR STEEL COMP 305 OVERALL |
| NOMINAL THREAD SIZE | 0.2500 INCHES |
| NUT COUNTERBORE DEPTH | 0.221 INCHES MINIMUM OVERALL EXCEPT THREADS |
| NUT DIAMETER | 0.325 INCHES MINIMUM AND 0.327 INCHES MAXIMUM |
| NUT GRIP RANGE | +0.220 TO 0.280 INCHES |
| NUT LENGTH | 1.077 INCHES MINIMUM AND 1.107 INCHES MAXIMUM |
| NUT STYLE | BLIND RIVET W/SMOOTH ROUND SHANK |
| SHANK END TYPE | OPEN |
| SPECIFICATION/STANDARD DATA | 80205-NAS1734 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| SURFACE TREATMENT | PASSIVATE OVERALL |
| THREAD CLASS | 3B |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD SERIES | UNJF |
| THREAD QUANTITY PER INCH | 28 |