| HEAD HEIGHT | 0.089 INCHES MAXIMUM |
| HEAD DIAMETER | 0.529 INCHES NOMINAL |
| HEAD STYLE | FLAT COUNTERSUNK REVERSE KEYED |
| KEY LENGTH | 0.089 INCHES MAXIMUM |
| MATERIAL DOCUMENT AND CLASSIFICATION | NAS1330 NATIONAL STD/SPEC SINGLE MATERIAL RESPONSE OVERALL |
| MATERIAL | STEEL OVERALL |
| PART NAME ASSIGNED BY CONTROLLING AGENCY | NUT, BLIND RIVET, COUNTER SUNK HEAD, INTERNAL THREAD, NON-LOCKING (FREE-RUNNING) AND SELF-LOCKING (PREVAILING TORQUE) |
| NOMINAL THREAD SIZE | 0.2500 INCHES |
| NUT DIAMETER | 0.328 INCHES MAXIMUM |
| NUT STYLE | BLIND RIVET W/SMOOTH ROUND SHANK |
| SHANK END TYPE | CLOSED |
| SPECIFICATION/STANDARD DATA | 80205-NAS1330 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD |
| SURFACE TREATMENT | CADMIUM OVERALL |
| THREAD CLASS | 3B |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD QUANTITY PER INCH | 20 |
| THREAD SERIES | UNIFIED NATIONAL COARSE (UNC) |