| BEARING SURFACE TYPE | FLAT |
| HARDNESS RATING | 26.0 ROCKWELL C MINIMUM AND 34.0 ROCKWELL C MAXIMUM |
| LOCKING FEATURE | PREVAILING TORQUE ALL METAL DESIGN |
| MATERIAL DOCUMENT AND CLASSIFICATION | SAE J429,GRADE 8 NATIONAL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| MATERIAL | STEEL OVERALL |
| NOMINAL THREAD SIZE | 0.625 INCHES |
| NUT HEIGHT | 0.535 INCHES MINIMUM AND 0.731 INCHES MAXIMUM |
| NUT STYLE | HEXAGON |
| SPECIAL FEATURES | 3 DEPRESSED CONSTRICTIONS ON TOP OF NUT |
| SPECIAL TEST FEATURES | MIN PROOF LOAD 33,900 LBS (150,000 PSI) |
| WIDTH ACROSS FLATS | 0.9220 INCHES MINIMUM AND 0.9396 INCHES MAXIMUM |
| SURFACE TREATMENT | PHOSPHATE ZINC AND OIL OVERALL |
| THREAD CLASS | 2B |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD PITCH DIAMETERS | +0.5660 TO 0.5732 INCHES |
| THREAD QUANTITY PER INCH | 11 |
| THREAD SERIES | UNIFIED NATIONAL COARSE (UNC) |