Quick view 1/2" Flat Washers, Aluminum Alloy 2024-T4 Aluminum: light weight, corrosion resistant and has excellent electrical and thermal conductivity.The nominal diameter is the bolt size to use for this flat washer.Diameter (Nominal): 1/2"Inside Diameter (Nominal): 9/16"Outside Diameter (Nominal):... $1,067.98 Select Quantity Compare