Quick view 5/16" 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): 5/16"Inside Diameter (Nominal): 11/32"Outside Diameter (Nominal):... $1,222.41 Select Quantity Compare