3/8-16X2 1/2 Unslotted Indented Hex Washer Thread Cutting Screw Type 23 Fully Threaded Zinc 450 pcs

3/8-16X2 1/2 Unslotted Indented Hex Washer Thread Cutting Screw Type 23 Fully Threaded Zinc. Thread-Cutting Type-23 screws provide excellent chip clearance with minimum tightening torques. Steel: Used in cast iron and zinc, aluminum die castings, and plastics. Stainless: Material into which the screw is to cut threads should have a lower hardness. Indented hex washer head offers advantages of hex head, plus greater protection to mating surface.