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 minimum
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