The MS27183 Military Flat Washer is a thin, circular metal ring with a large inner diameter and a small outer diameter. It is made of cadmium-plated steel and has a thickness of .271-.734 inches. The washer is used to distribute the load of a bolt or screw over a larger surface area, preventing damage to the material being fastened. It also helps to prevent the bolt or screw from loosening due to vibration or movement. The MS27183 washer meets the specifications of Military Standard MS27183 and is commonly used in military and aerospace applica