Thread Cutting Screw Finish Zinc Plated Material Steel Head Style Hex Drive Slotted Thread Size 5/16 In.-18 Fastener Length 3/4 in Head Type Hex Washer Head and Washer Height 0.23 in Dimensional Standards SAE J933 Maximum Head Width 0.5 in Minimum Head Width 0.489 in Maximum Head Height 0.23 in Minimum Head Height 0.208 in System of Measurement Inch Head Height 0.23 in Head Width 0.5 in Includes Nut No Includes Washer No Package Quantity 100