... : SAE,USS,F436 4.Material:Carbon steel,Stainless steel Specification of our washer: 1.NameDIN9021 Stainless steel flat washers 2.StandardDIN, IFI, ISO, JIS, AS ... or wooden case10.CertificateISO9001:2008What else of washers we can offer? 1.NameFlat washer,Spring lock washer, Square washer,Dished washer,Bevel ...