5/16"-18 x 3/4" Grade 5 Zinc Finish Hex Cap Screw / THREAD DIRECTION: RIGHT-HAND FASTENER LENGTH: 0.750 INCHES NOMINAL HEAD STYLE: C1 HEXAGON WIDTH BETWEEN FLATS: 0.500 INCHES NOMINAL END ITEM IDENTIFICATION: F-15SA NOMINAL THREAD DIAMETER: 0.312 INCHES THREAD QUANTITY PER INCH: 18 MINIMUM TENSILE STRENGTH: 120000 POUNDS PER SQUARE INCH PART NAME ASSIGNED BY CONTROLLING AGENCY: ZINC FINISH GRD 5 HEX CAP SCREW MATERIAL: STEEL OVERALL SURFACE TREATMENT: ZINC OVERALL THREAD SERIES DESIGNATOR: UNC