1/4"-28 x 1/2" Hex Drive Knurled Cup Point Black Oxide Finish Alloy Steel Socket Set Screw / THREAD CLASS: 1A THREAD DIRECTION: RIGHT-HAND FASTENER LENGTH: 0.500 INCHES NOMINAL HEAD STYLE: C101 HEADLESS (SETSCREW) POINT STYLE: F20 CUP INTERNAL DRIVE STYLE: D5 HEXAGON END ITEM IDENTIFICATION: INTERNALLY TRANSPORTABLE VEHICLE (ITV-LSV) NOMINAL THREAD DIAMETER: 0.250 INCHES WIDTH ACROSS FLATS: 0.125 INCHES NOMINAL THREAD QUANTITY PER INCH: 28 PART NAME ASSIGNED BY CONTROLLING AGENCY: 1/4-28 X 1/2 BLACK OXIDE ALLOY STEEL KNURLED SOCKET SET SCREW COLOR: BLACK OVERALL MATERIAL: STEEL OVERALL SURFACE TREATMENT: OXIDE OVERALL THREAD SERIES DESIGNATOR: UNF