#2 x 1/4 x .125 Flat Washer Nylon is a thin, flat, circular disc with a hole in the center. It is made of nylon, a strong and flexible plastic material. The washer is used to distribute the load of a screw or bolt over a larger area, preventing the screw or bolt from pulling through the material it is being fastened to. The washer also helps to prevent the screw or bolt from damaging the material it is being fastened to.