| DIAMETER OF RECESSED PORTION OF SHANK | 0.446 INCHES MINIMUM AND 0.450 INCHES MAXIMUM |
| HARDNESS RATING | 39.0 ROCKWELL C MINIMUM AND 43.0 ROCKWELL C MAXIMUM |
| LENGTH OF RECESSED PORTION OF SHANK | 0.380 INCHES NOMINAL |
| MATERIAL DOCUMENT AND CLASSIFICATION | ASTM A322 ASSN STD ALL MATERIAL RESPONSES OR ASTM A331 ASSN STD ALL MATERIAL RESPONSES |
| MATERIAL | STEEL COMP 4140 OR STEEL COMP 8640 OR STEEL COMP 8740 |
| PROPRIETARY CHARACTERISTICS | PACS |
| NOMINAL THREAD SIZE | 0.562 INCHES NUT THREAD |
| NOMINAL THREAD SIZE | 0.562 INCHES STUD THREAD |
| OVERALL LENGTH | 2.380 INCHES NOMINAL |
| SPECIAL FEATURES | COLOR RED |
| STYLE DESIGNATOR | RECESSED |
| SURFACE FINISH | 32.0 MICROINCHES SHANK |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-P-416, TYPE 2 FED SPEC ALL TREATMENT RESPONSES OVERALL |
| SURFACE TREATMENT | CADMIUM OVERALL AND CHROMATE OVERALL |
| THREAD CLASS | 5 NUT THREAD |
| THREAD DIRECTION | RIGHT-HAND NUT THREAD |
| THREAD DIRECTION | RIGHT-HAND STUD THREAD |
| THREAD LENGTH | 1.190 INCHES NOMINAL STUD THREAD |
| THREAD LENGTH | 0.810 INCHES NOMINAL NUT THREAD |
| THREAD PITCH DIAMETERS | +0.5101/+0.5157 INCHES STUD THREAD |
| THREAD PITCH DIAMETERS | +0.5196/+0.5236 INCHES NUT THREAD |
| THREAD QUANTITY PER INCH | 12 STUD THREAD |
| THREAD QUANTITY PER INCH | 18 NUT THREAD |
| THREAD SERIES DESIGNATOR | UNC STUD THREAD |
| THREAD SERIES DESIGNATOR | UNJF NUT THREAD |