1/4"-28 x 5/16" Hex Drive Cup Point Grade 18-8 Stainless Steel Socket Set Screw / THREAD CLASS: 3A THREAD DIRECTION: RIGHT-HAND FASTENER LENGTH: 0.312 INCHES NOMINAL HEAD STYLE: C101 HEADLESS (SETSCREW) POINT DIAMETER: 0.118 INCHES MINIMUM AND 0.132 INCHES MAXIMUM POINT STYLE: F20 CUP INTERNAL DRIVE STYLE: D5 HEXAGON NOMINAL THREAD DIAMETER: 0.250 INCHES WIDTH ACROSS FLATS: 0.125 INCHES NOMINAL THREAD QUANTITY PER INCH: 28 POINT CHAMFER ANGLE: 118.0 DEGREES NOMINAL MATERIAL: STEEL CORROSION RESISTING OVERALL THREAD SERIES DESIGNATOR: UNF