The M8 steel flat washer is constructed of premium 304 stainless steel for superior durability and rust resistance. These 8 mm fender washer are designed to provide a larger bearing surface which helps prevent the nut or bolt head from tearing material and loosening due to vibration and corrosion. It has an inner diameter of 8 mm, outer diameter of 22 mm, and a thickness of 2 mm. This washer is suitable for use in homes, cars, and shops, as it distributes the load of fasteners on its surface and can also be used as a hardware washers, spring, gasket, or locking device. Steel flat washers.