8-15 x 3/8 Square Pan Self Tapping Screw Type A Fully Threaded Zinc 5/16-18-.200 and a 6-lobe pan head

and a 6-lobe pan head for easy driving and secure hold

while its 1/2-inch length provides ample grip for secure fastening

The slotted indented hex head allows for easy driving with a hex key or screwdriver

The 6-lobe modified truss head provides excellent driving torque and prevents cam-out

#2 Medium Split Lock Washer Black Oxide is a versatile and durable washer designed to prevent loosening of fasteners due to vibration or movement

8-15 x 3/8 Square Pan Self Tapping Screw Type A Fully Threaded Zinc 5/16-18-.200 and a 6-lobe pan headThese 8 15 x 3 8 square pan self tapping screws are Type A screws, meaning they have a fully threaded body. They are made of steel and have a zinc coating for corrosion resistance. These screws are designed to be driven into metal without the need for a pre drilled hole. They are commonly used in a variety of applications, including metal roofing, siding, and HVAC.