6 x 5/16 Round Head Type U Drive Screw 18-8 Stainless Steel KPO and a self-tapping thread that

and a self-tapping thread that creates its own mating threads as it is driven in

The #12 Regular (medium) Split Lock Washer Zinc and Bake is a type of washer that is used to prevent nuts and bolts from loosening

and it also helps to prevent the screws from loosening over time

Black Phosphate is a high-quality nut designed for use in automated assembly applications

6 x 5/16 Round Head Type U Drive Screw 18-8 Stainless Steel KPO and a self-tapping thread thatThese 6 x 5 16 Round Head Type U Drive Screws are made of 18 8 stainless steel, which provides excellent corrosion resistance. They have a round head with a Phillips drive, and are designed for use in a variety of applications. The Type U drive has a rounded bottom that helps to prevent cam out, making them easy to install. These screws are also self tapping, which eliminates the need for pre drilling.