DIN931 stainless steel nut 1.material:200,300,400 ect 2 ... steel nuts 1)Size and type: Bolt: M3-M64 hexagonal head, hex socket headNut: M3-M64 hexagonal, wing/butterfly ... with all sizes are also available. 2.Materials option: Stainless Steel C276, 904L, 304, 304L,310S, 316, 316L, 321, ... 317L,Super duplex stainless steel F55, F51,F53 HastelloyB&C, Inconel, Incoloy etc. 3. ...