5/16-18 x 1 1/4 Slotted HWH Machine Screw Type F Zinc Plated

5/16-18 x 1 1/4 Slotted HWH Machine Screw Type F Zinc Plated . Slot hex head thread cutting screw with machine screw thread with blunt tapered point. having multi-cutting edges and chip cavities. For heavy gauge sheet metal. aluminum, zinc and lead die castings, cast Iron, brass and plastic.