#4-40 x 1/2" ASTM F879 Hex Drive 18-8 Stainless Steel Button Socket Cap Screw / THREAD DIRECTION: RIGHT-HAND THREAD LENGTH: 0.50 INCHES NOMINAL FASTENER LENGTH: 0.50 INCHES NOMINAL HEAD STYLE: C30 BUTTON HEAD DIAMETER: 0.213 INCHES NOMINAL HEAD HEIGHT: 0.059 INCHES NOMINAL INTERNAL DRIVE STYLE: D5 HEXAGON END ITEM IDENTIFICATION: MRAP - M-ATV UI NOMINAL THREAD DIAMETER: 0.112 INCHES WIDTH ACROSS FLATS: 0.0625 INCHES NOMINAL THREAD QUANTITY PER INCH: 40 PART NAME ASSIGNED BY CONTROLLING AGENCY: 18-8 STAINLESS STEEL BUTTON SOCKET HEAD CAP SCREW MATERIAL: STEEL PROPERTY CLASS 18.8 OVERALL THREAD SERIES DESIGNATOR: UNC