#5-40 x 1/4" ASTM F879 Hex Drive Grade 18-8 Stainless Steel Flat Socket Cap Screw / THREAD CLASS: 3A THREAD DIRECTION: RIGHT-HAND THREAD LENGTH: 0.13 INCHES MINIMUM AND 0.16 INCHES MAXIMUM FASTENER LENGTH: 0.22 INCHES MINIMUM AND 0.25 INCHES MAXIMUM HEAD STYLE: A39 FLAT COUNTERSUNK HEAD DIAMETER: 0.240 INCHES MINIMUM AND 0.281 INCHES MAXIMUM HEAD HEIGHT: 0.090 INCHES NOMINAL INTERNAL DRIVE STYLE: NOMINAL THREAD DIAMETER: 0.1250 INCHES WIDTH ACROSS FLATS: 0.0781 INCHES NOMINAL THREAD QUANTITY PER INCH: 40 PART NAME ASSIGNED BY CONTROLLING AGENCY: FLAT HEAD SOCKET CAP SCREW MATERIAL: STEEL CORROSION RESISTING THREAD SERIES DESIGNATOR: UNRC