... steel,Stainless steel Specification of our nut: 1.NameDIN557 Square Nuts 2.StandardDIN, IFI, ISO, JIS, AS,BS, EN, ... ., Black Oxided, Dacromet,Geomet,etc8.Production TechniqueCold forming,Hot forging,Machining,Heat treatment,etc9.Production Capacity2-3X20'GP/Month10.PackageBulk ... box,then pallet or wooden case11.CertificateISO9001:2008What else of nuts we can offer? 1.NameHex nut, Coupling nut, Nylon ...