3/8-16X3 Unslotted Indented Hex Thread Cutting Screw Type F Fully Threaded Zinc, Pkg of 300 Low Price

3/8-16X3 Unslotted Indented Hex Thread Cutting Screw Type F Fully Threaded Zinc. Thread-Cutting Type-F threaded screws are used in heavy gauge sheet metal, aluminum, zinc and lead die castings, cast iron, brass and plastic. In stainless steel, material into which the screw is to cut threads should have a lower hardness by 10-20 Rockwell hardness. Indented hex head screws are designed to be driven by a wrench or pneumatic tools.