| HARDNESS RATING | 40.0 ROCKWELL C MINIMUM AND 45.0 ROCKWELL C MAXIMUM |
| OVERALL LENGTH | 1.240 INCHES MINIMUM AND 1.250 INCHES MAXIMUM |
| MATERIAL | STEEL COMP 8740 OR STEEL COMP 8630 |
| NOMINAL THREAD SIZE | 0.312 INCHES NUT THREAD |
| NOMINAL THREAD SIZE | 0.312 INCHES STUD THREAD |
| PART NAME ASSIGNED BY CONTROLLING AGENCY | NAVY SPECIAL PROJECT |
| SURFACE FINISH | 32.0 MICROINCHES NUT THD |
| SURFACE FINISH | 32.0 MICROINCHES STUD THD |
| SURFACE FINISH | 63.0 MICROINCHES SHANK |
| 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 | 0.348 INCHES MINIMUM AND 0.387 INCHES MAXIMUM NUT THREAD |
| THREAD LENGTH | 0.480 INCHES MINIMUM AND 0.520 INCHES MAXIMUM STUD THREAD |
| THREAD QUANTITY PER INCH | 18 STUD THREAD |
| THREAD QUANTITY PER INCH | 24 NUT THREAD |
| THREAD PITCH DIAMETERS | +0.2810 TO 0.2825 INCHES STUD THREAD |
| THREAD SERIES DESIGNATOR | UNC STUD THREAD |
| THREAD SERIES DESIGNATOR | UNF NUT THREAD |