Black Oxide Cup Head Bolt

Product :black oxide cup head screws Standard :DIN Specification: M2-M26 Material :Carbon steel4.8grade,8.8grade,10.9grade,12.9grade;   stainless steel202,304,316,316L;Brass Productive Process:wire rod→Anneal→Acid cleaing→Draw wire→molding and rolling thread→Heat treatment→Surface treat →Packing  Surface treat :Plain,Black oxide,Blue white zinc,Yellow zinc,Hot dip  galvanized,Copper plating,Gold plating,Chromium Plating.  Quality :Control Raw material inspect→process monitoring→Product test→Packaging check Certification   :      ISO9001:2008   CE cert    ROHs Packaging :product bulk in plastic bag→Carton box→Wood pallet Application :Wind tower,Nuclear power,Railway,Automotive industry,Construction,Electronic industry Delivery time        :        3-30days Payment Terms :T⁄T30%deposit,the balance70%when we finish…