| HARDNESS RATING | 32.0 ROCKWELL C MINIMUM AND 37.0 ROCKWELL C MAXIMUM |
| OVERALL LENGTH | 1.620 INCHES NOMINAL |
| MATERIAL DOCUMENT AND CLASSIFICATION | QQ-S-624 FED SPEC ALL MATERIAL RESPONSES |
| MATERIAL | STEEL COMP 8640 OR STEEL COMP 8637 |
| NOMINAL THREAD SIZE | 0.312 INCHES NUT THREAD |
| NOMINAL THREAD SIZE | 0.312 INCHES STUD THREAD |
| SPECIAL FEATURES | WITH 0.120 IN. DIA NYLOK PELLETCENTERED 0.200 IN. FROM STUD END |
| SURFACE TREATMENT | PHOSPHATE OVERALL |
| THREAD CLASS | 3A NUT THREAD |
| THREAD DIRECTION | RIGHT-HAND NUT THREAD |
| THREAD DIRECTION | RIGHT-HAND STUD THREAD |
| THREAD LENGTH | 0.620 INCHES MINIMUM STUD THREAD |
| THREAD LENGTH | 0.810 INCHES MINIMUM NUT THREAD |
| THREAD PITCH DIAMETERS | +0.2854 TO 0.2869 INCHES STUD THREAD |
| THREAD SERIES DESIGNATOR | UNIFIED NATIONAL COARSE (UNC) NUT THREAD |
| THREAD SERIES DESIGNATOR | UNS STUD THREAD |
| THREAD QUANTITY PER INCH | 18 NUT THREAD |
| THREAD QUANTITY PER INCH | 18 STUD THREAD |