› 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 › 1/4-20X1 1/2 Slotted Indented Hex Washer Thread Cutting Screw Type 1 Fully Threaded Zinc And