Quick view ID=49/64" Flat Washers, AISI 304 Stainless Steel (18-8) Type 304 stainless steel is defined as a Chromium-Nickel austenitic alloy.Stainless steel significantly improves resistance to tarnishing or corrosion.The nominal diameter is the bolt size to use for this flat washer.Inside Diameter (Nominal):... $214.85 Select Quantity Compare