Spring&flat washer 1)SizeaaM3-M36, NO.6-1/2'' 2) ... . Specifications of washers SpecificationM2-M40MaterialMild carbon steel, medium carbon steel, high carbon steel, Stainless steel,copper,phosphorization, dacromet,cuprodine.Material grade ... full responsibility for it. superiority Good quality,free for samples.Product photos for referenceFlat washers Spring washersOther type of washers can be ...