| BEARING SURFACE TYPE | CHAMFERED |
| COUNTERBORE DIAMETER | 0.270 INCHES MAXIMUM NUT |
| HARDNESS RATING | 38.0 ROCKWELL C MINIMUM AND 45.0 ROCKWELL C MAXIMUM |
| LOCKING FEATURE | PREVAILING TORQUE ALL METAL DESIGN |
| LUBRICATION | SOLUBLE LUBRICANT |
| MATERIAL DOCUMENT AND CLASSIFICATION | AMS 6304 ASSN STD 1ST MATERIAL RESPONSE OR AMS 6322 ASSN STD 2ND MATERIAL RESPONSE OR AMS 6485 ASSN STD 3RD MATERIAL RESPONSE OVERALL |
| MATERIAL | STEEL COMP 601 OR STEEL COMP 8740 OR STEEL COMP H11 OVERALL |
| NOMINAL THREAD SIZE | 0.250 INCHES |
| NUT HEIGHT | 0.199 INCHES MAXIMUM |
| NUT STYLE | DOUBLE HEXAGON |
| SPECIFICATION/STANDARD DATA | 80205-NAS1759 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD |
| WIDTH ACROSS FLATS | 0.430 INCHES MINIMUM AND 0.439 INCHES MAXIMUM |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-P-416,TY 2,CL 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 SERIES | UNJF |
| THREAD QUANTITY PER INCH | 28 |