› Screws › Thread-Cutting › type 23 thread cutting screws › hex washer type 23 thread cutting screws › unslotted hex washer type 23 thread cutting screws › steel zinc unslotted hex washer type 23 thread cutting screws › 5/16-18X5/8 Unslotted Indented Hex Washer Thread Cutting Screw Type 23 Fully Threaded Zinc