4-40X3/8 Slotted Indented Hex Washer Thread Cutting Screw Type F Fully Thread 18-8 Stain (Pack Qty 5,000) BC-0406FSW188

Slotted Indented Hex Washer Thread Cutting Screw Type F Fully Thread 18-8 Stain

Steel thread-cutters are used in heavy gauge sheet metal, aluminum, zinc and lead die castings, cast iron, brass and plastic. Stainless screws offer additional resistance to corrosion, 18-8 moreso than 410. When using any thread-cutting screw, the material in which the threads are cut should have a lower hardness by at least 10 to 20 Rockwell hardness points