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＃6～1-1/2 、 M4～M36、up to 130mm length Designed to join two externally threaded objects usually threaded rod together. Coupling nuts are used in joining threaded rods or where a threaded fitting is used with threaded rod in suspension applications. Material: Carbon Steel、Alloy Steel、Stainless Steel、Aluminum、Copper Finish: Zinc plating、Zn-Ni plating、HDG、Xylan、Geomet、Magni、Copper plating、Nickel plating in any type of coating