| DISTANCE ACROSS FLATS | 0.740 INCHES MINIMUM AND 0.752 INCHES MAXIMUM |
| HARDNESS RATING | 27.0 ROCKWELL C MINIMUM AND 32.0 ROCKWELL C MAXIMUM |
| OVERALL LENGTH | 1.638 INCHES MINIMUM AND 1.764 INCHES MAXIMUM |
| MATERIAL DOCUMENT AND CLASSIFICATION | QQ-T-570,CL S1 FED SPEC SINGLE MATERIAL RESPONSE |
| NOMINAL THREAD SIZE | 0.250 INCHES NUT THREAD |
| NUT END SHANK DIAMETER | 0.246 INCHES MINIMUM AND 0.249 INCHES MAXIMUM |
| NUT END SHANK LENGTH | 0.171 INCHES MINIMUM AND 0.203 INCHES MAXIMUM |
| PART NAME ASSIGNED BY CONTROLLING AGENCY | NAVY SPECIAL PROJECT |
| SHOULDER LENGTH | 0.171 INCHES MINIMUM AND 0.203 INCHES MAXIMUM |
| STYLE DESIGNATOR | SHOULDERED |
| SURFACE FINISH | 125.0 MICROINCHES 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 | 0.500 INCHES MINIMUM AND 0.515 INCHES MAXIMUM STUD THREAD |
| THREAD LENGTH | 0.750 INCHES MINIMUM AND 0.765 INCHES MAXIMUM NUT THREAD |
| THREAD SERIES DESIGNATOR | UNF NUT THREAD |
| THREAD SERIES DESIGNATOR | UNF STUD THREAD |
| THREAD QUANTITY PER INCH | 28 NUT THREAD |
| THREAD QUANTITY PER INCH | 28 STUD THREAD |