The 7/16 x .063 NAS1149 Military Flat Washer is a high-strength, corrosion-resistant washer designed for use in military and aerospace applications. It is made from 18-8 stainless steel and meets the requirements of DFAR (Defense Federal Acquisition Regulation). The washer has a diameter of 7/16 inches and a thickness of .063 inches. It is designed to distribute the load of a fastener evenly over a surface, preventing damage to the material being fastened. The washer is also heat-treated for added strength and durability.