5/16-12X1 1/2 Indented Hex Unslotted Self Tapping Screw Type A B Fully Threaded Zinc (Pack Qty 1,000) BC-3124ABH

For self starting in thin (.015-.050 thick) metal or resin-filled plywood. Recommended over a Type-A, particularly in brittle materials Screws shall be quenched in liquid and then tempered by reheating to 650°F minimumYou may also like 5/8-18X3 1/4 Fine Thread Hex Cap Screw Grade 8 Zinc Yellow Made in USA (Pack Qty 100) BC-6352CH8O.