| COUNTERBORE DIAMETER | 0.291 INCHES MINIMUM AND 0.295 INCHES MAXIMUM NUT |
| HARDNESS RATING | 39.0 ROCKWELL C MINIMUM AND 43.0 ROCKWELL C MAXIMUM |
| LOCKING FEATURE | PREVAILING TORQUE ALL METAL DESIGN |
| LUBRICATION | DRY FILM LUBRICANT |
| OVERALL HEIGHT | 0.365 INCHES MAXIMUM |
| MATERIAL DOCUMENT AND CLASSIFICATION | AMS 6322 ASSN STD 1ST MATERIAL RESPONSE OR AMS 6300 ASSN STD 2ND MATERIAL RESPONSE OVERALL |
| MATERIAL | STEEL COMP 8740 OR STEEL COMP 4037 OVERALL |
| NOMINAL THREAD SIZE | 0.250 INCHES |
| NUT COUNTERBORE DEPTH | 0.175 INCHES MINIMUM AND 0.185 INCHES MAXIMUM NUT |
| NUT STYLE | HEXAGON |
| WASHER OUTSIDE DIAMETER | 0.425 INCHES MAXIMUM |
| WIDTH ACROSS FLATS | 0.305 INCHES MINIMUM AND 0.313 INCHES MAXIMUM |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | ASTM B545 ASSN STD SINGLE TREATMENT RESPONSE OVERALL |
| SURFACE TREATMENT | TIN OVERALL |
| TEMP RATING | 232.0 CELSIUS MAXIMUM |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD CLASS | 3B |
| THREAD SERIES | UNJF |
| THREAD QUANTITY PER INCH | 28 |