| BEARING SURFACE TYPE | CHAMFERED OR WASHER FACED |
| HARDNESS RATING | 32.0 ROCKWELL C MAXIMUM |
| LOCKING FEATURE | PREVAILING TORQUE WITH NONMETALLIC INSERT |
| LUBRICATION | DRY FILM LUBRICANT |
| MATERIAL DOCUMENT AND CLASSIFICATION | GRADE 5 STEEL PER SAE J995 NATIONAL STD/SPEC SINGLE MATERIAL RESPONSE NUT |
| MATERIAL | STEEL NUT |
| NOMINAL THREAD SIZE | 0.250 INCHES |
| NONDEFINITIVE SPEC/STD DATA | G5 MATERIAL AND 4C SIZE |
| NUT HEIGHT | 0.298 INCHES MINIMUM AND 0.328 INCHES MAXIMUM |
| NUT STYLE | HEXAGON |
| PART NAME ASSIGNED BY CONTROLLING AGENCY | NUT,SELF-LOCKING,HEXAGON,NON-METALLIC LOCKING FEATURE,250DEG F,UNC/UNF-2B |
| SPECIFICATION/STANDARD DATA | 81349-MIL-DTL-45913/1A GOVERNMENT SPECIFICATION |
| WIDTH ACROSS FLATS | 0.428 INCHES MINIMUM AND 0.439 INCHES MAXIMUM |
| TEMP RATING | 250.0 FAHRENHEIT NOMINAL |
| THREAD CLASS | 2B |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD QUANTITY PER INCH | 20 |
| THREAD SERIES | UNIFIED NATIONAL COARSE (UNC) |