... ,JIS,ANSI plain washer/spring lock washer stainless steel/zp Product name Galvanized flat washers SpecificationM2-M40MaterialMild carbon steel, medium carbon steel, high carbon steel, Stainless steel,copper ... ,phosphorization, dacromet,cuprodine.Material grade A2,A4, 4.8,6.8,8.8,12.9Color Plain ...