| MILITARY STANDARDS PROMULGATED BY MILITARY DEPARTMENTS UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M | 96906 |
| THREAD CLASS | 3A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 0.630 INCHES MINIMUM AND 0.690 INCHES MAXIMUM |
| FASTENER LENGTH | 1.500 INCHES NOMINAL |
| HEAD STYLE | DOUBLE HEXAGON W/HOLE |
| HEAD HEIGHT | 0.260 INCHES NOMINAL |
| WIDTH BETWEEN FLATS | 0.243 INCHES MINIMUM AND 0.251 INCHES MAXIMUM |
| EXTENDED WASHER DIAMETER | 0.375 INCHES NOMINAL |
| EXTENDED WASHER THICKNESS | 0.040 INCHES MINIMUM AND 0.050 INCHES MAXIMUM |
| NOMINAL THREAD DIAMETER | 0.190 INCHES |
| GRIP LENGTH | 0.810 INCHES MINIMUM AND 0.870 INCHES MAXIMUM |
| FEATURES PROVIDED | FINISHED HEAD |
| THREAD QUANTITY PER INCH | 32 |
| MINIMUM TENSILE STRENGTH | 130000 POUNDS PER SQUARE INCH |
| HARDNESS RATING | 248.0 BRINELL STANDARD MINIMUM OVERALL AND 341.0 BRINELL STANDARD MAXIMUM OVERALL |
| MINIMUM YIELD STRENGTH | 85000 POUNDS PER SQUARE INCH |
| SURFACE FINISH | 32.0 MICROINCHES BEARING SURFACE OF HEAD |
| SURFACE FINISH | 32.0 MICROINCHES GRIP |
| SURFACE FINISH | 32.0 MICROINCHES THREADS |
| MATERIAL | IRON ALLOY 660 OVERALL |
| MATERIAL DOCUMENT AND CLASSIFICATION | AMS 5731 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| THREAD SERIES DESIGNATOR | UNJF |
| An externally threaded fastener designed for insertion through holes in assembled parts and normally intended to be tightened or released by torquing a nut. The threaded and unthreaded portions are both of one nominal diameter of .19 inch (5 mm) or larger. The head is not designed to be held or driven with an inserted driver or by the thumb and fingers. A locking feature may be incorporated in the design of the head or threads. Head dimensions and sizes of threaded and unthreaded portions shall conform to internationally recognized fastener standards. For items having a grip length portion machined to a tolerance of . 15 inch ( . 38 mm) or less, BOLT, SHEAR. See also SCREW, CAP, HEXAGON HEAD and SCREW, MACHINE. |
