6-18X3 Phillips Flat Self Tapping Screw Type A Fully Threaded Black Oxide (Pack Qty 1,500) BC-0648APFB

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 A thread forming tapping screw with wider spaced threads than a Type-AB and a gimlet point