| COUNTERBORE DIAMETER | 0.615 INCHES MINIMUM AND 0.635 INCHES MAXIMUM NUT |
| FEATURES PROVIDED | CASEHARDENED |
| HARDNESS RATING | 26.0 ROCKWELL C MINIMUM AND 32.0 ROCKWELL C MAXIMUM |
| LOCKING FEATURE | PREVAILING TORQUE ALL METAL DESIGN |
| OVERALL HEIGHT | 0.680 INCHES MINIMUM AND 0.700 INCHES MAXIMUM |
| MATERIAL DOCUMENT AND CLASSIFICATION | QQ-S-624 FED SPEC 1ST MATERIAL RESPONSE OR QQ-S-624 FED SPEC 2ND MATERIAL RESPONSE OR QQ-S-624 FED SPEC 3RD MATERIAL RESPONSE OVERALL |
| MATERIAL | STEEL COMP 4140 OR STEEL COMP 8640 OR STEEL COMP 8740 OVERALL |
| NOMINAL THREAD SIZE | 0.625 INCHES |
| NUT COUNTERBORE DEPTH | 0.010 INCHES MINIMUM AND 0.030 INCHES MAXIMUM NUT |
| NUT STYLE | HEXAGON |
| SPECIAL FEATURES | 125 MICROINCHES RMS ALL OVER EXCEPT 32 MICROINCHES RMS ON WASHER FACE |
| WASHER OUTSIDE DIAMETER | 0.990 INCHES MINIMUM AND 1.010 INCHES MAXIMUM |
| WASHER THICKNESS | 0.110 INCHES MINIMUM AND 0.130 INCHES MAXIMUM |
| WIDTH ACROSS FLATS | 0.865 INCHES MINIMUM AND 0.875 INCHES MAXIMUM |
| THREAD CLASS | 3B |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD QUANTITY PER INCH | 18 |
| THREAD SERIES | UNF |