Thread Cutting Screw, 5/16" x 1 in, Zinc Plated Steel Hex Head Slotted Drive, 100 PKMfr #: 3116FSWS Price For: Each System of Measurement: Inch Application: For Use In Heavy Gauge Sheet Metal, Aluminum, Zinc, Lead Die Castings, Cast Iron, Brass and Plastic Type: F Thread Size: 5 16 18 Material: steel Length: 1" Head Height: 0. 222" Item: Thread Cutting Screw Head Dia.: 0. 492" Finish: zinc plated Meets Exceeds: ASME B18. 6. 4 1998 Head Type: Hex Washer Driver Size: 1 Drive Type: Slotted Country of Origin (subject to change): Multiple