| THREAD SERIES | UNJF |
| NOMINAL THREAD SIZE | 0.438 INCHES |
| THREAD QUANTITY PER INCH | 20 |
| THREAD CLASS | 3B |
| THREAD DIRECTION | RIGHT-HAND |
| MATERIAL | STEEL COMP 8740 OR |
| STEEL COMP 8630 OR |
| STEEL COMP 4037 OR |
| STEEL COMP H11 OVERALL |
| MATERIAL DOCUMENT AND CLASSIFICATION | AMS 6322 ASSN STD 1ST MATERIAL RESPONSE OR |
| AMS 6280 ASSN STD 2ND MATERIAL RESPONSE OR |
| AMS 6300 ASSN STD 3RD MATERIAL RESPONSE OR |
| AMS 6304 ASSN STD 4TH MATERIAL RESPONSE OVERALL |
| SURFACE TREATMENT | CADMIUM OVERALL |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-P-416,TY 2,CL 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| HARDNESS RATING | 38.0 ROCKWELL C MINIMUM AND |
| 45.0 ROCKWELL C MAXIMUM |
| NUT STYLE | DOUBLE HEXAGON |
| NUT HEIGHT | 0.372 INCHES MAXIMUM |
| WIDTH ACROSS FLATS | 0.679 INCHES MINIMUM AND |
| 0.690 INCHES MAXIMUM |
| BEARING SURFACE TYPE | CHAMFERED |
| LOCKING FEATURE | PREVAILING TORQUE ALL METAL DESIGN |
| LUBRICATION | SOLUBLE LUBRICANT |
| TEMP RATING | -65.0 DEG FAHRENHEIT MINIMUM AND |
| 450.0 DEG FAHRENHEIT MAXIMUM |
| BEARING SURFACE FINISH | 125.0 MICROINCHES |