| HARDNESS RATING | 25.0 ROCKWELL C MINIMUM AND 34.0 ROCKWELL C MAXIMUM |
| OVERALL LENGTH | 2.500 INCHES MINIMUM AND 3.000 INCHES MAXIMUM |
| MATERIAL DOCUMENT AND CLASSIFICATION | 666 FED STD ALL MATERIAL RESPONSES |
| MATERIAL | STEEL COMP 4140 OR STEEL COMP 4142 OR STEEL COMP 4145 |
| NOMINAL THREAD SIZE | 0.625 INCHES NUT THREAD |
| NOMINAL THREAD SIZE | 0.625 INCHES STUD THREAD |
| NONDEFINITIVE SPEC/STD DATA | 1 TYPE AND B7 GRADE |
| PART NAME ASSIGNED BY CONTROLLING AGENCY | NAVY SPECIAL PROJECT |
| THREAD CLASS | 3A NUT THREAD |
| THREAD CLASS | 5A STUD THREAD |
| THREAD DIRECTION | RIGHT-HAND NUT THREAD |
| THREAD DIRECTION | RIGHT-HAND STUD THREAD |
| THREAD LENGTH | 0.812 INCHES NOMINAL STUD THREAD |
| THREAD LENGTH | 1.250 INCHES NOMINAL NUT THREAD |
| THREAD QUANTITY PER INCH | 11 STUD THREAD |
| THREAD QUANTITY PER INCH | 11 NUT THREAD |
| THREAD SERIES DESIGNATOR | UNIFIED NATIONAL COARSE (UNC) NUT THREAD |
| THREAD SERIES DESIGNATOR | UNIFIED NATIONAL COARSE (UNC) STUD THREAD |