1.Name:Zinc plated cup washer 2.Size: M6-M20 3.Grade: SAE,USS,F436 ... steel Specification of our washer: 1.NameZinc plated cup washer 2.StandardDIN, IFI, ISO, JIS, AS,BS, EN, SAE,ASTM3.GradeSAE,USS ... , Square washer,Dished washer,Bevel washer,etc2.StandardDIN, IFI, ISO, JIS, AS,BS, EN, SAE, ASTM3.GradeSAE,USS,F4364.MaterialCarbon steel ...