| HARDNESS RATING | 42.0 ROCKWELL C MINIMUM AND 46.0 ROCKWELL C MAXIMUM |
| MATERIAL DOCUMENT AND CLASSIFICATION | AMS6304 ASSN STD SINGLE MATERIAL RESPONSE |
| MATERIAL | STEEL COMP 601 |
| NOMINAL THREAD SIZE | 0.250 INCHES NUT THREAD |
| NOMINAL THREAD SIZE | 0.250 INCHES STUD THREAD |
| SHOULDER LENGTH | 0.615 INCHES MINIMUM AND 0.635 INCHES MAXIMUM |
| STYLE DESIGNATOR | SHOULDERED |
| SURFACE FINISH | 32.0 MICROINCHES NUT THD |
| SURFACE FINISH | 32.0 MICROINCHES STUD THD |
| SURFACE FINISH | 63.0 MICROINCHES HEAD BEARING SURFACE |
| SURFACE FINISH | 63.0 MICROINCHES TOP OF HEAD |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | AMS 2416 ASSN STD SINGLE TREATMENT RESPONSE OVERALL |
| SURFACE TREATMENT | NICKEL AND CHROMATE OVERALL |
| THREAD CLASS | 3A NUT THREAD |
| THREAD CLASS | 3A STUD THREAD |
| THREAD DIRECTION | RIGHT-HAND NUT THREAD |
| THREAD DIRECTION | RIGHT-HAND STUD THREAD |
| THREAD LENGTH | 0.615 INCHES MINIMUM AND 0.635 INCHES MAXIMUM NUT THREAD |
| THREAD LENGTH | 0.625 INCHES NOMINAL STUD THREAD |
| THREAD SERIES DESIGNATOR | UNIFIED NATIONAL JOINT FINE (UNJF) NUT THREAD |
| THREAD SERIES DESIGNATOR | UNIFIED NATIONAL JOINT FINE (UNJF) STUD THREAD |
| THREAD QUANTITY PER INCH | 28 NUT THREAD |
| THREAD QUANTITY PER INCH | 28 STUD THREAD |