6-18X3/4 Phillips Flat Self Tap Screw Type A Full Thread 18 8 Stainless Steel Black Oxide (Pack Qty 5,000) BC-0612APF188B

Screws shall be quenched in liquid and then tempered by reheating to 650°F minimum. They are the screw thread covering the whole length of the screw from tip to head and a pronounced thread hard enough for the intended. Steel: Rockwell C45 minimum Stainless: Austenitic 18-8 stainless steel