| MATERIAL | IRON ALLOY 660 |
| MATERIAL DOCUMENT AND CLASSIFICATION | AMS5731 ASSN STD SINGLE MATERIAL RESPONSE OR |
| AMS5734 ASSN STD SINGLE MATERIAL RESPONSE |
| SURFACE TREATMENT | PASSIVATE OVERALL |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| STYLE DESIGNATOR | LOCKED IN |
| DISTANCE FROM SERRATED PORTION TO NUT END | 1.735 INCHES MINIMUM AND |
| 1.765 INCHES MAXIMUM |
| DISTANCE FROM SERRATED PORTION TO STUD END | 1.056 INCHES MINIMUM AND |
| 1.096 INCHES MAXIMUM |
| DISTANCE FROM SERRATED PORTION TO END OF STUD THREAD | 0.180 INCHES MINIMUM AND |
| 0.220 INCHES MAXIMUM |
| OVERALL LENGTH | 1.950 INCHES NOMINAL |
| THREAD SERIES DESIGNATOR | UNJF NUT THREAD A |
| UNJF NUT THREAD B |
| NOMINAL THREAD SIZE | 0.375 INCHES NUT THREAD A |
| 0.500 INCHES NUT THREAD B |
| THREAD CLASS | 3A NUT THREAD A |
| 3A NUT THREAD B |
| THREAD QUANTITY PER INCH | 24 NUT THREAD A |
| 13 NUT THREAD B |
| THREAD DIRECTION | RIGHT-HAND NUT THREAD A |
| RIGHT-HAND NUT THREAD B |
| THREAD LENGTH | 0.735 INCHES MINIMUM AND |
| 0.765 INCHES MAXIMUM NUT THREAD A |
| 0.856 INCHES MINIMUM AND |
| 0.896 INCHES MAXIMUM NUT THREAD B |
| LOCKING FEATURE | RING, LOCK SERRATED |
| HARDNESS RATING | 277.0 BRINELL HULTGREN NOMINAL |
| SURFACE FINISH | 32.0 MICROINCHES NUT THD |
| 63.0 MICROINCHES SHANK |
| SERRATION QUANTITY | 24 |
| SERRATION INCLUDED ANGLE | 102.0 DEGREES NOMINAL |
| SPEC/STD CONTROLLING DATA | |
| MANUFACTURERS CODE | 81349 |
| NON-DEFINITIVE GOVERNMENT SPEC/STD REFERENCE | MIL-S-45909 |
| MANUFACTURERS CODE | 96906 |
| DEFINITIVE GOVERNMENT SPEC/STD REFERENCE | MS51992C805-28 |