| HARDNESS RATING | 28.0 ROCKWELL C MINIMUM AND 32.0 ROCKWELL C MAXIMUM |
| OVERALL LENGTH | 1.531 INCHES NOMINAL |
| MATERIAL DOCUMENT AND CLASSIFICATION | AMS 6280 ASSN STD 1ST MATERIAL RESPONSE OR AMS 6322 ASSN STD 2ND MATERIAL RESPONSE OR AMS 6324 ASSN STD 2ND MATERIAL RESPONSE OR AMS 6370 ASSN STD 3RD MATERIAL RESPONSE |
| MATERIAL | STEEL COMP 8630 OR STEEL COMP 8740 OR STEEL COMP 4130 |
| NOMINAL THREAD SIZE | 0.312 INCHES NUT THREAD |
| NOMINAL THREAD SIZE | 0.375 INCHES STUD THREAD |
| SHANK DIAMETER | 0.312 INCHES NOMINAL |
| SPECIAL FEATURES | STUD END THREAD 0.007 IN. OVERSIZE |
| STYLE DESIGNATOR | STEPPED |
| SURFACE FINISH | 100.0 MICROINCHES STUD THD |
| SURFACE FINISH | 40.0 MICROINCHES NUT 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 MINIMUM NUT THREAD |
| THREAD LENGTH | 0.521 INCHES MINIMUM STUD THREAD |
| THREAD PITCH DIAMETERS | +0.3475 TO 0.3491 INCHES STUD THREAD |
| THREAD QUANTITY PER INCH | 16 STUD THREAD |
| THREAD QUANTITY PER INCH | 24 NUT THREAD |
| THREAD SERIES DESIGNATOR | UNF NUT THREAD |
| THREAD SERIES DESIGNATOR | UNS STUD THREAD |