... .Grade: SAE,USS,F436 4.Material:Stainless steel Specification of our washer: 1.NameStainless steel DIN7980 High collar lock washer 2.StandardDIN, IFI, ISO ... :2008What else of washers we can offer? 1.NameFlat washer,Spring lock washer, Square washer,Dished washer,Bevel washer,etc2.StandardDIN, IFI ...