8-18 x 3/8 Phillips Indented Hex Washer Self Tapping Screw Type AB Fully Threaded Zinc MPO188 They have a serrated flange

They have a serrated flange that helps to prevent loosening and a hex head for easy installation

It has a 6-lobe drive and a length of 1/4 inch

The 5/16-18 NTE Thin Pattern Nylon Insert Hex Lock Nut Zinc is a type of nut that is used to secure bolts and screws

With a diameter of 18mm and a thickness of 2mm

which gives it a yellow color and helps to protect it from corrosion

8-18 x 3/8 Phillips Indented Hex Washer Self Tapping Screw Type AB Fully Threaded Zinc MPO188 They have a serrated flangeThese 8 18 x 3 8 Phillips indented hex washer self tapping screws are Type AB screws made of steel and have a zinc finish. They are fully threaded and have a Phillips drive. These screws are designed for use in metal and are self tapping, meaning they create their own threads as they are driven into the material. They are commonly used in a variety of applications, including automotive, construction, and manufacturing.