| LOCKING FEATURE | PREVAILING TORQUE ALL METAL DESIGN |
| LUBRICATION | SOLUBLE LUBRICANT |
| PART NAME ASSIGNED BY CONTROLLING AGENCY | NAVY SPECIAL PROJECT |
| MATERIAL | PLASTIC POLYHEXAMETHYLENE AMIDE OR PLASTIC POLYCAPROLACTAM LOCKING INSERT |
| MATERIAL | STEEL COMP 5155 OR STEEL COMP 303 PLUS X NUT |
| NOMINAL THREAD SIZE | 0.250 INCHES |
| NUT HEIGHT | 0.486 INCHES MINIMUM AND 0.491 INCHES MAXIMUM |
| NUT STYLE | CLINCH |
| PILOT LENGTH | 0.129 INCHES MINIMUM AND 0.141 INCHES MAXIMUM |
| PILOT DIAMETER | 0.357 INCHES MINIMUM AND 0.361 INCHES MAXIMUM |
| SURFACE TREATMENT | PASSIVATE NUT |
| TEMP RATING | 250.0 FAHRENHEIT NOMINAL |
| THREAD CLASS | 3B |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD SERIES | UNIFIED NATIONAL COARSE (UNC) |
| THREAD QUANTITY PER INCH | 20 |
| WIDTH ACROSS FLATS | 0.428 INCHES MINIMUM AND 0.448 INCHES MAXIMUM |