| COUNTERBORE DIAMETER | 0.266 INCHES MINIMUM AND 0.268 INCHES MAXIMUM |
| FASTENER LENGTH | 0.995 INCHES MINIMUM AND 1.005 INCHES MAXIMUM |
| HEAD HEIGHT | 0.145 INCHES MINIMUM AND 0.155 INCHES MAXIMUM |
| HEAD STYLE | HEXAGON |
| HOLE CONFIGURATION STYLE | HEXAGON LONGITUDINAL HOLE |
| HOLE DIAMETER | 0.040 INCHES MINIMUM AND 0.050 INCHES MAXIMUM |
| HOLE QUANTITY | 4 |
| HOLE TYPE | DRILLED |
| MATERIAL DOCUMENT AND CLASSIFICATION | QQ-S-763 FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| MATERIAL | STEEL COMP 347 OVERALL |
| PROPRIETARY CHARACTERISTICS | PACS |
| NOMINAL THREAD DIAMETER | 0.500 INCHES |
| SPECIAL FEATURES | FSECOND COUNTERBORE UNTHREADED 0.343 MIN. AND 0.345 MAX. DIAMETER AND 0.875 MIN. AND 0.885 MAX. LENGTH,TWO UNDERCUTS,FIRST UNDER HEAD 0.423 MIN. AND 0.426 MAX. DIAMETER AND 0.120 MIN. AND 0.140 MAX. LENGTH,SECOND UNDERCUT IN THREADED AREA,FROM HEAD TO BEGINNING OF UNDERCUT 0.445 MIN. AND 0.455 MAX. WIDTH 0.140 MIN. AND 0.150 MAX.,DIAMETER 0.423 MIN. AND 0.426 MAX.,HEAD SLOTTED TWO WAYS,0.310 MIN. AND 0.330 MAX. WIDTH AND 0.025 MIN. AND 0.035 MAX. DEEP |
| WIDTH BETWEEN FLATS | 0.625 INCHES NOMINAL |
| STYLE DESIGNATOR | COUNTERBORE UNTHREADED |
| THREAD CLASS | 3A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 0.855 INCHES MINIMUM AND 0.885 INCHES MAXIMUM |
| THREAD QUANTITY PER INCH | 20 |
| THREAD SERIES DESIGNATOR | UNF |
| CONCENTRIC HOLE DIAMETER | 0.155 INCHES MINIMUM AND 0.157 INCHES MAXIMUM |
| COUNTERBORE DEPTH | 0.980 INCHES MINIMUM AND 0.990 INCHES MAXIMUM |