... DH, /8/ 4.Material:Carbon steel,Stainless steel Specification of our nut: 1.NameDIN557 Square Nuts 2.StandardDIN, IFI, ISO, ... Oxided, Dacromet,Geomet,etc8.Production TechniqueCold forming,Hot forging,Machining,Heat treatment,etc9.Production Capacity2-3X20'GP/Month10 ... Oxided, Dacromet,Geomet,etc8.Production TechniqueCold forming,Hot forging,Machining,Heat treatment,etc9.Production Capacity2-3x20'GP/ ...