... ,ss316,40Cr,etc 3.SGS,ISO 4.black,zinc plated,HDG,etc din975 din976 stainless steel and carbon steel threaded rod threaded rod 1.various ... .3.material of thread rod:stainless steel S304,SS316,SS201 ,carbon steel Q235,A3,40Cr,etc4.surface treatment:black,white blue,zinc nickel Passivation ...