| BEARING SURFACE FINISH | 125.0 MICROINCHES |
| COUNTERBORE DIAMETER | 0.277 INCHES MINIMUM AND 0.287 INCHES MAXIMUM NUT |
| HARDNESS RATING | 36.0 ROCKWELL C MINIMUM AND 40.0 ROCKWELL C MAXIMUM OR 40.0 ROCKWELL C MINIMUM AND 45.0 ROCKWELL C MAXIMUM |
| LOCKING FEATURE | PREVAILING TORQUE ALL METAL DESIGN |
| LUBRICATION | DRY FILM LUBRICANT |
| NUT COUNTERBORE DEPTH | 0.072 INCHES MINIMUM AND 0.087 INCHES MAXIMUM NUT |
| NUT STYLE | FLAT WITH TURNED UP EDGE |
| OVERALL HEIGHT | 0.271 INCHES MINIMUM AND 0.291 INCHES MAXIMUM |
| MATERIAL | STEEL COMP 1050 WASHER |
| MATERIAL | STEEL COMP 4340 OR STEEL COMP 8740 NUT |
| NOMINAL THREAD SIZE | 0.250 INCHES |
| SPECIFICATION/STANDARD DATA | 80205-NAS1726 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD |
| WASHER OUTSIDE DIAMETER | 0.460 INCHES MAXIMUM |
| WIDTH ACROSS FLATS | 0.274 INCHES MINIMUM AND 0.284 INCHES MAXIMUM |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-P-416 TYPE 2 CLASS 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| SURFACE TREATMENT | CADMIUM AND CHROMATE OVERALL |
| TEMP RATING | 450.0 FAHRENHEIT MAXIMUM |
| THREAD CLASS | 3B |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD QUANTITY PER INCH | 28 |
| THREAD SERIES | UNJF |