#4 Machine Screw Washer Black Zinc NR The black oxide and oil

The black oxide and oil coating provides excellent protection against rust and corrosion

this machine bolt is a reliable choice for fastening metal

and the 3 1/2-inch length provides ample thread engagement for secure fastening

This 5/16-18 x 3 3/4 Hex Cap Screw is made of durable 18-8 stainless steel

#4 Machine Screw Washer Black Zinc NR The black oxide and oil#4 Machine Screw Washer Black Zinc is a small, flat, circular metal washer used to distribute the load of a screw or bolt. It is made of steel and has a black zinc finish for corrosion resistance. The washer has an outer diameter of 0. 437 inches and an inner diameter of 0. 136 inches. It is 0. 020 inches thick. The washer is used in a variety of applications, including automotive, construction, and manufacturing.