Product Details
The 5/16-18x1 unslotted indented hex washer thread cutting screw type 1 is fully threaded and made of zinc. These thread-cutting type-1 screws are designed for use in materials such as steel sheets, structural shapes, special alloy steels, cast iron, brass, or plastics. It is essential that the stainless steel material into which the screw is to cut threads has a lower hardness by 10-20 Rockwell hardness to ensure optimal performance. The indented hex washer head combines the benefits of a hex head with enhanced protection for the mating surface.
