| MATERIAL | IRON ALLOY 660 |
| MATERIAL DOCUMENT AND CLASSIFICATION | AMS 5731 ASSN STD SINGLE MATERIAL RESPONSE OR |
| AMS 5734 ASSN STD SINGLE MATERIAL RESPONSE |
| SURFACE TREATMENT | PASSIVATE OVERALL |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | ASTM A380 ASSN STD SINGLE TREATMENT RESPONSE OVERALL |
| STYLE DESIGNATOR | LOCKED IN |
| DISTANCE FROM SERRATED PORTION TO NUT END | 0.860 INCHES MINIMUM AND |
| 0.890 INCHES MAXIMUM |
| DISTANCE FROM SERRATED PORTION TO STUD END | 0.735 INCHES MINIMUM AND |
| 0.765 INCHES MAXIMUM |
| DISTANCE FROM SERRATED PORTION TO END OF STUD THREAD | 0.125 INCHES NOMINAL |
| OVERALL LENGTH | 1.735 INCHES NOMINAL |
| THREAD SERIES DESIGNATOR | UNJF NUT THREAD |
| UNF STUD THREAD |
| NOMINAL THREAD SIZE | 0.312 INCHES NUT THREAD |
| 0.438 INCHES STUD THREAD |
| THREAD CLASS | 3A NUT THREAD |
| 2A STUD THREAD |
| THREAD QUANTITY PER INCH | 24 NUT THREAD |
| 20 STUD THREAD |
| THREAD DIRECTION | RIGHT-HAND NUT THREAD |
| RIGHT-HAND STUD THREAD |
| THREAD LENGTH | 0.673 INCHES MINIMUM AND |
| 0.693 INCHES MAXIMUM NUT THREAD |
| 0.610 INCHES MINIMUM AND |
| 0.640 INCHES MAXIMUM STUD THREAD |
| LOCKING FEATURE | RING, LOCK SERRATED |
| SPECIAL FEATURES | 140000P.S.I. MIN. TENSILE STRENGTH |
| HARDNESS RATING | 277.0 BRINELL HULTGREN NOMINAL |
| SURFACE FINISH | 63.0 MICROINCHES OVERALL |
| SPEC/STD CONTROLLING DATA | |
| MANUFACTURERS CODE | 96906 |
| DEFINITIVE GOVERNMENT SPEC/STD REFERENCE | MS51992C644-14 |