... .black,zinc plated,HDG,etc din975 din976 stainless steel and carbon steel threaded rod threaded rod 1.various kinds of thread ... .3.material of thread rod:stainless steel S304,SS316,SS201 ,carbon steel Q235,A3,40Cr,etc4.surface treatment:black,white blue ... or according require7.grade:stainless steel A2-70,A4-70,carbon steel 4.6,4.8,8.8,10.9,B7 ...