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A hex coupling nut is a fastener with internal thread typically used with a screw or bolt to connect two or more parts. It is used in subassemblies together with screws, bolts or washers of the same diameter to fasten various elements and details in machine building and construction. Thanks to its high strength, it is a durable and reliable choice for varied applications. It is used in construction, mechanics and other fields where a secure and strong connection is essential.