1/4-20X2 Six Lobe Pan Floor Board Screw Type F Fully Threaded Black Phosphate (Pack Qty 500) BC-1432FTPB by Shorpioen

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 | Steel: Screws shall be quenched in liquid and then tempered by reheating to 650F minimum. 410 Stainless: Screws shall be annealed by heating to 1850-1950F, held at least for 1/2 hour and rapid air- or oil-quenched then reheating to 525F minimum for at | Steel: AISI 1016 - 1024 or equivalent steel. Stainless: 410 martensitic stainless steel or 18-8 stainless steel