› Screws › Thread-Cutting › type 1 thread cutting screws › hex washer type 1 thread cutting screws › slotted hex washer type 1 thread cutting screws › steel zinc slotted hex washer type 1 thread cutting screws › 5/16-18X3/4 Slotted Indented Hex Washer Thread Cutting Screw Type 1 Fully Threaded Zinc And