| AERONAUTICAL STANDARDS GROUP DEPT OF NAVY AND AIR FORCE | 88044 |
| THREAD CLASS | 3A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 0.469 INCHES MINIMUM |
| FASTENER LENGTH | 2.531 INCHES NOMINAL |
| HEAD STYLE | HEXAGON |
| HEAD HEIGHT | 0.140 INCHES MINIMUM AND 0.172 INCHES MAXIMUM |
| WIDTH BETWEEN FLATS | 0.428 INCHES MINIMUM AND 0.440 INCHES MAXIMUM |
| HOLE DIAMETER | 0.046 INCHES NOMINAL |
| SHANK UNTHREADED HOLE DIAMETER | 0.076 INCHES NOMINAL FIRST HOLE |
| NOMINAL THREAD DIAMETER | 0.250 INCHES |
| GRIP LENGTH | 2.062 INCHES NOMINAL |
| HOLE QUANTITY | 1 |
| HOLE TYPE | DRILLED |
| FEATURES PROVIDED | FINISHED HEAD |
| THREAD QUANTITY PER INCH | 28 |
| MINIMUM TENSILE STRENGTH | 125000 POUNDS PER SQUARE INCH |
| HARDNESS RATING | 26.0 ROCKWELL C MINIMUM OVERALL AND 32.0 ROCKWELL C MAXIMUM OVERALL |
| HOLE CONFIGURATION STYLE | HEXAGON FLATS |
| DISTANCE FROM HEAD LARGEST BEARING SURFACE TO SHANK HOLE CENTER | 2.374 INCHES NOMINAL FIRST HOLE |
| MATERIAL | STEEL COMP 4037 OVERALL OR STEEL COMP 4130 OVERALL OR STEEL COMP 8630 OVERALL OR STEEL COMP 8735 OVERALL OR STEEL COMP 8740 OVERALL OR STEEL COMP 4140 OVERALL |
| MATERIAL DOCUMENT AND CLASSIFICATION | MIL-B-6812 MIL SPEC ALL MATERIAL RESPONSES OVERALL |
| SURFACE TREATMENT | CADMIUM OVERALL AND CHROMATE OVERALL |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-P-416 TY 2 CL 3 FED SPEC ALL TREATMENT RESPONSES OVERALL |
| THREAD SERIES DESIGNATOR | UNF |
| 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. |
