5/16"-18 x 9-1/2" ASTM F593 18-8 Stainless Steel Hex Cap Screw / THREAD DIRECTION: RIGHT-HAND THREAD LENGTH: 1.12 INCHES NOMINAL FASTENER LENGTH: 9.70 INCHES NOMINAL HEAD STYLE: C1 HEXAGON HEAD HEIGHT: 0.20 INCHES NOMINAL WIDTH BETWEEN FLATS: 0.49 INCHES NOMINAL END ITEM IDENTIFICATION: TRUCK, FIRE FIGHTING NOMINAL THREAD DIAMETER: 0.38 INCHES THREAD QUANTITY PER INCH: 18 MATERIAL: STEEL PROPERTY CLASS 18.8 OVERALL THREAD SERIES DESIGNATOR: UNC