| PROPRIETARY CHARACTERISTICS | PACS |
| NOMINAL THREAD DIAMETER | 0.4375 INCHES |
| SCREW MATERIAL DOCUMENT AND CLASSIFICATION | MS21099-67 MIL STD SINGLE MATERIAL RESPONSE |
| SCREW MATERIAL | STEEL CORROSION RESISTING |
| WIDTH ACROSS FLATS | 0.50 INCHES NOMINAL |
| THREAD CLASS | 3A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD QUANTITY PER INCH | 20 |
| THREAD SERIES DESIGNATOR | UNF |
| EXTENDED WASHER THICKNESS | 0.056 INCHES MINIMUM AND 0.062 INCHES MAXIMUM |
| HEAD HEIGHT | 0.256 INCHES NOMINAL |
| HEAD STYLE | DOUBLE HEXAGON EXTENDED WASHER |
| INTERNAL DRIVE STYLE | DOUBLE HEXAGON |
| LOCKING FEATURE | STRIP |
| III PART NAME ASSIGNED BY CONTROLLING AGENCY | SCREW STRIP TENSIONER INST. |