| BEARING SURFACE OF HEAD SURFACE FINISH | 32.0 MICROINCHES |
| EXTENDED WASHER THICKNESS | 0.060 INCHES MINIMUM |
| EXTENDED WASHER DIAMETER | 0.428 INCHES MINIMUM AND 0.448 INCHES MAXIMUM |
| FASTENER LENGTH | 0.750 INCHES NOMINAL |
| HEAD HOLE CONFIGURATION STYLE | ROUND |
| HEAD HEIGHT | 0.293 INCHES MINIMUM AND 0.313 INCHES MAXIMUM |
| HEAD STYLE | DOUBLE HEXAGON W/ HOLE |
| HOLE DIAMETER | 1.60 MILLIMETERS NOMINAL |
| HOLE QUANTITY | 4 |
| NOMINAL THREAD DIAMETER | 0.250 INCHES |
| SCREW MATERIAL DOCUMENT AND CLASSIFICATION | K7766-BS HR 650 NATIONAL STD/SPEC SINGLE MATERIAL RESPONSE |
| SCREW MATERIAL | STEEL |
| WIDTH BETWEEN FLATS | 0.302 INCHES MINIMUM AND 0.322 INCHES MAXIMUM |
| THREAD CLASS | 3A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 0.755 INCHES NOMINAL |
| THREAD QUANTITY PER INCH | 28 |
| THREAD SURFACE FINISH | 32.0 MICROINCHES |
| THREAD SERIES DESIGNATOR | UNJF |