flat washer 1.Delivery time:7days 2.OEM:manufacturer 3.ISO9001:2008,ROHS 4.Standard:GB,DIN,JIS,ANSI DIN125 ... A flat washer without chamfer for screw up to property class 8.8 ... steel,copper,phosphorization, dacromet,cuprodine.Material grade A2,A4, 4.8,6.8,8.8,12.9Color Plain, blue plated, white plated, yellow plated ...