Flat washers USS also known as regular or plain flat washers are the most common type of flat washers used in a wide variety of applications that are round or circular with a hole in the middle with a smooth surface on both sides of the washer generally used with bolt and nut for distributing stress. USS Flat washers are available in zinc plated ZP steel, grade 8 yellow zinc YZ, stainless steel SS, hot dipped galvanized HDG, plain steel and other alloys.
