... of our nut: 1.NameDIN6923 Hexagon flange nut2.StandardDIN, IFI, ISO, JIS, AS,BS, EN, SAE,ASTM3.GradeGr.2,5 ... Black Oxided, Dacromet,Geomet,etc8.Production TechniqueCold forming,Hot forging,Machining,Heat treatment,etc9.Production Capacity2-3X20'GP/Month10. ... Black Oxided, Dacromet,Geomet,etc8.Production TechniqueCold forming,Hot forging,Machining,Heat treatment,etc9.Production Capacity2-3x20'GP/Month10. ...