8-18 x 3/4 Phillips Oval #6 Head Self Tapping Screw Type AB Fully Thread Zinc AWB They have a hex washer

They have a hex washer head and are designed to tap their own threads as they are driven into a material

12-24 x 1 1/2 Phillips Pan Machine Screw Fully Threaded Black Zinc is a type of screw that is used in a variety of applications

and the fully threaded body provides a secure hold

and other small machinery

meaning that they have threads along their entire length for maximum holding power

8-18 x 3/4 Phillips Oval #6 Head Self Tapping Screw Type AB Fully Thread Zinc AWB They have a hex washerThese 8 18 x 3 4 Phillips Oval #6 Head Self Tapping Screw Type AB Fully Thread Zinc are designed for use in a variety of applications. They are made of zinc plated steel for durability and corrosion resistance. The Phillips oval head provides a secure hold and the self tapping design eliminates the need for pre drilling. These screws are ideal for use in metal, wood, and plastic.