5/16"-18 x 1" ASTM F879 Hex Drive Grade 18-8 Stainless Steel Flat Socket Cap Screw / THREAD CLASS: COURSE THREAD DIRECTION: RIGHT-HAND THREAD LENGTH: 1.052 INCHES NOMINAL FASTENER LENGTH: 1.250 INCHES NOMINAL HEAD STYLE: C50 FLAT COUNTERSUNK HEAD DIAMETER: 0.656 INCHES NOMINAL INTERNAL DRIVE STYLE: D5 HEXAGON END ITEM IDENTIFICATION: 7310-01-295-7479, TRAY RATION HEATING SYSTEM (TRHS) NOMINAL THREAD DIAMETER: 0.313 INCHES WIDTH ACROSS FLATS: 0.188 INCHES NOMINAL THREAD QUANTITY PER INCH: 18 COUNTERSINK ANGLE: 82.0 DEGREES NOMINAL MATERIAL: STEEL CORROSION RESISTING OVERALL THREAD SERIES DESIGNATOR: UNC