8-18X3/4 Square Recess Pan Self Tapping Screw Type A B Fully Threaded Zinc (Pack Qty 8,000) BC-0812ABQP

For self starting in thin (.015-.050 thick) metal or resin-filled plywood. Recommended over a Type-A, particularly in brittle materialsYou may also like 1/2-20 NE Nylon Insert Hex Lock Nut Zinc (Pack Qty 300) BC-51NS.