| MATERIAL | IRON ALLOY 660 OVERALL |
| MATERIAL DOCUMENT AND CLASSIFICATION | AMS 5731 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| HARDNESS RATING | 30.0 ROCKWELL C MINIMUM AND |
| 36.0 ROCKWELL C MAXIMUM OVERALL |
| STYLE DESIGNATOR | SHOULDER |
| SHANK LENGTH | 0.790 INCHES MINIMUM AND |
| 0.820 INCHES MAXIMUM |
| SHOULDER WIDTH ACROSS FLATS | 0.430 INCHES MINIMUM AND |
| 0.439 INCHES MAXIMUM |
| SHANK DIAMETER | 0.2491 INCHES MINIMUM AND |
| 0.2496 INCHES MAXIMUM |
| OVERALL LENGTH | 1.560 INCHES MINIMUM AND |
| 1.600 INCHES MAXIMUM |
| SECOND SHANK DIAMETER | 0.2495 INCHES MINIMUM AND |
| 0.2505 INCHES MAXIMUM |
| SECOND SHANK LENGTH | 0.660 INCHES MINIMUM AND |
| 0.680 INCHES MAXIMUM |
| FIRST END STYLE | CHAMFERED |
| FIRST END TAPER LENGTH | 0.040 INCHES MAXIMUM |
| FIRST END TAPER ANGLE | 50.0 DEGREES NOMINAL |
| SECOND END RELATIONSHIP WITH FIRST END | NOT IDENTICAL |
| SECOND END STYLE | CHAMFERED |
| SECOND END TAPER LENGTH | 0.100 INCHES MINIMUM AND |
| 0.120 INCHES MAXIMUM |
| SECOND END TAPER ANGLE | 14.0 DEGREES MINIMUM AND |
| 16.0 DEGREES MAXIMUM |
| FIRST END LOCATION | THREADED END |
| THREAD SERIES DESIGNATOR | UNJF |
| NOMINAL THREAD SIZE | 0.250 INCHES |
| THREAD CLASS | 3A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 0.360 INCHES MINIMUM AND |
| 0.400 INCHES MAXIMUM |
| SURFACE FINISH | 63.0 MICROINCHES BEARING |
| 63.0 MICROINCHES LARGE SHANK |
| 32.0 MICROINCHES LONG SHANK |