| THREAD SERIES | UNJF |
| NOMINAL THREAD SIZE | 0.438 INCHES |
| THREAD QUANTITY PER INCH | 20 |
| THREAD CLASS | 3B |
| THREAD DIRECTION | RIGHT-HAND |
| MATERIAL | PLASTIC NYLON LOCKING INSERT |
| STEEL COMP 1137 OR |
| STEEL COMP 11L37 OR |
| STEEL COMP 8740 NUT |
| MATERIAL DOCUMENT AND CLASSIFICATION | AMS 5024 ASSN STD 1ST MATERIAL RESPONSE OR |
| AMS 5020 ASSN STD 2ND MATERIAL RESPONSE OR |
| AMS 6322 ASSN STD 3RD MATERIAL RESPONSE OR |
| AMS 6323 ASSN STD 3RD MATERIAL RESPONSE OR |
| AMS 6325 ASSN STD 3RD MATERIAL RESPONSE OR |
| AMS 6327 ASSN STD 3RD MATERIAL RESPONSE OR |
| AMS 6358 ASSN STD 3RD MATERIAL RESPONSE NUT |
| QQ-A-225/6,T4 FED SPEC 1ST MATERIAL RESPONSE OR |
| QQ-A-250/13,T6 FED SPEC 2ND MATERIAL RESPONSE WASHER |
| SURFACE TREATMENT | CADMIUM AND |
| CHROMATE NUT |
| CHROMATE WASHER |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-P-416 TYPE 2 CLASS 2 FED SPEC SINGLE TREATMENT RESPONSE NUT |
| MIL-C-5541 MIL SPEC SINGLE TREATMENT RESPONSE WASHER |
| NUT STYLE | FLAT WITH TURNED BACK EDGE |
| WASHER OUTSIDE DIAMETER | 0.755 INCHES MINIMUM AND |
| 0.785 INCHES MAXIMUM |
| OVERALL HEIGHT | 0.473 INCHES MINIMUM AND |
| 0.513 INCHES MAXIMUM |
| WIDTH ACROSS FLATS | 0.616 INCHES MINIMUM AND |
| 0.627 INCHES MAXIMUM |
| LOCKING FEATURE | PREVAILING TORQUE WITH NONMETALLIC INSERT |
| NUT COUNTERBORE DEPTH | 0.249 INCHES MINIMUM AND |
| 0.269 INCHES MAXIMUM NUT |
| COUNTERBORE DIAMETER | 0.519 INCHES MINIMUM AND |
| 0.529 INCHES MAXIMUM NUT |
| TEMP RATING | 250.0 DEG FAHRENHEIT MAXIMUM |
| BEARING SURFACE FINISH | 125.0 MICROINCHES |