| COUNTERSINK ANGLE | 90.0 DEGREES NOMINAL NUT |
| HARDNESS RATING | 21.0 ROCKWELL C MINIMUM AND 27.0 ROCKWELL C MAXIMUM |
| LOCKING FEATURE | FREE-RUNNING ALL METAL DESIGN |
| OVERALL HEIGHT | 1.000 INCHES MINIMUM AND 1.015 INCHES MAXIMUM |
| MATERIAL DOCUMENT AND CLASSIFICATION | ASTM A400 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| MATERIAL | STEEL OVERALL |
| NOMINAL THREAD SIZE | 1.375 INCHES |
| NUT STYLE | HEXAGON |
| SPECIAL FEATURES | NO. 63.0 FINISH ON BEARING SURFACE OF WASHER |
| WASHER OUTSIDE DIAMETER | 2.110 INCHES MINIMUM AND 2.140 INCHES MAXIMUM |
| WASHER THICKNESS | 0.391 INCHES MINIMUM AND 0.421 INCHES MAXIMUM |
| WIDTH ACROSS FLATS | 1.720 INCHES MINIMUM AND 1.730 INCHES MAXIMUM |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | MIL-C-13924,CL 2 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL |
| SURFACE TREATMENT | OXIDE OVERALL |
| THREAD CLASS | 3B |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD QUANTITY PER INCH | 12 |
| THREAD SERIES | UNF |