| HARDNESS RATING | 28.0 ROCKWELL C MINIMUM AND 32.0 ROCKWELL C MAXIMUM |
| OVERALL LENGTH | 3.281 INCHES NOMINAL |
| MATERIAL | STEEL COMP 8740 OR STEEL COMP 4130 |
| NOMINAL THREAD SIZE | 0.250 INCHES NUT THREAD |
| NOMINAL THREAD SIZE | 0.312 INCHES STUD THREAD |
| SHANK DIAMETER | 0.250 INCHES NOMINAL |
| SPECIAL FEATURES | STUD END THREAD 0.004 IN. OVERSIZE |
| STYLE DESIGNATOR | STEPPED |
| SURFACE FINISH | 100.0 MICROINCHES NUT THD |
| SURFACE FINISH | 40.0 MICROINCHES STUD THD |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | AMS 2400 ASSN STD SINGLE TREATMENT RESPONSE OVERALL |
| SURFACE TREATMENT | CADMIUM OVERALL |
| THREAD CLASS | 3A NUT THREAD |
| THREAD DIRECTION | RIGHT-HAND NUT THREAD |
| THREAD DIRECTION | RIGHT-HAND STUD THREAD |
| THREAD LENGTH | 0.438 INCHES NOMINAL STUD THREAD |
| THREAD LENGTH | 0.500 INCHES MINIMUM NUT THREAD |
| THREAD PITCH DIAMETERS | +0.2826 TO 0.2842 INCHES STUD THREAD |
| THREAD QUANTITY PER INCH | 18 STUD THREAD |
| THREAD QUANTITY PER INCH | 28 NUT THREAD |
| THREAD SERIES DESIGNATOR | UNF NUT THREAD |
| THREAD SERIES DESIGNATOR | UNS STUD THREAD |