5/16-9X1 3/4 Slotted Indented Hex Washer Self Tapping Screw Type A Fully Threaded Zinc (Pack Qty 750) BC-3128ASW

For self starting in thin (.015-.050 thick) metal or resin-filled plywood. 18-8 Stainless steel tapping screws may be used in applications which require general atmospheric corrosion resistance. Fastening stainless steel parts to aluminum or steel can cause a type of corrosion known as a galvanic couple in some environments Screws shall be quenched in liquid and then tempered by reheating to 650°F minimum Steel: Rockwell C45 minimum