The 5/16 x .032 NAS1149 Military Flat Washer is a thin, round, metal washer with a 5/16-inch inner diameter and a .032-inch thickness. It is made of 18-8 stainless steel, which is highly resistant to corrosion and rust. The washer is designed to be used with a 5/16-inch bolt or screw, and it helps to distribute the load of the fastener over a larger area, preventing damage to the material being fastened. The washer also helps to prevent the fastener from loosening over time. It meets the requirements of the National Aerospace Standard (NAS) 114