12-14X3 1/2 Unslotted Indented Hex Washer Self Tapping Screw Type AB Fully Threaded Zinc An (Pack Qty 600) BC-1256ABW

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