| THREAD SERIES | UNF |
| NOMINAL THREAD SIZE | 0.562 INCHES |
| THREAD QUANTITY PER INCH | 18 |
| THREAD CLASS | 3B |
| THREAD DIRECTION | RIGHT-HAND |
| MATERIAL | STEEL COMP 4140 OR |
| STEEL COMP 8640 OR |
| STEEL COMP 8740 OVERALL |
| MATERIAL DOCUMENT AND CLASSIFICATION | QQ-S-624 FED SPEC ALL MATERIAL RESPONSES 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 | 26.0 ROCKWELL C MINIMUM AND |
| 32.0 ROCKWELL C MAXIMUM |
| NUT STYLE | HEXAGON |
| WASHER OUTSIDE DIAMETER | 0.865 INCHES MINIMUM AND |
| 0.885 INCHES MAXIMUM |
| OVERALL HEIGHT | 0.580 INCHES MINIMUM AND |
| 0.600 INCHES MAXIMUM |
| WASHER THICKNESS | 0.110 INCHES MINIMUM AND |
| 0.130 INCHES MAXIMUM |
| WIDTH ACROSS FLATS | 0.740 INCHES MINIMUM AND |
| 0.752 INCHES MAXIMUM |
| LOCKING FEATURE | FREE-RUNNING ALL METAL DESIGN |
| COUNTERSINK ANGLE | 108.0 DEGREES MINIMUM AND |
| 112.0 DEGREES MAXIMUM NUT |