| HARDNESS RATING | 29.0 ROCKWELL C MINIMUM AND 39.0 ROCKWELL C MAXIMUM |
| LOCKING FEATURE | PREVAILING TORQUE WITH NONMETALLIC INSERT |
| LUBRICATION | DRY FILM LUBRICANT |
| OVERALL HEIGHT | 0.350 INCHES MAXIMUM |
| MATERIAL DOCUMENT AND CLASSIFICATION | A50TF146,CL A,FSCM 07482 MFR REF SINGLE MATERIAL RESPONSE LOCKING INSERT |
| MATERIAL DOCUMENT AND CLASSIFICATION | AMS 5737 ASSN STD SINGLE MATERIAL RESPONSE OVERALL EXCEPT INSERT |
| MATERIAL | IRON ALLOY 660 OVERALL EXCEPT INSERT |
| MATERIAL | PLASTIC POLYAMIDE NYLON LOCKING INSERT |
| NOMINAL THREAD SIZE | 0.250 INCHES |
| NUT STYLE | DOUBLE HEXAGON |
| WASHER OUTSIDE DIAMETER | 0.531 INCHES MAXIMUM |
| WASHER THICKNESS | 0.070 INCHES MINIMUM AND 0.090 INCHES MAXIMUM |
| WIDTH ACROSS FLATS | 0.367 INCHES MINIMUM AND 0.376 INCHES MAXIMUM |
| THREAD CLASS | 3B |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD SERIES | UNIFIED NATIONAL JOINT FINE (UNJF) |
| THREAD QUANTITY PER INCH | 28 |