Long Hex Coupling Nut

Long hex coupling nut, also called hex extension nut, is a special long hexagonal fastener with full internal thread, designed to connect two bolts or threaded rods end-to-end to extend overall assembly length. The six-sided outer profile provides stable clamping force with standard spanner/wrench installation, much easier to lock and adjust than round coupling sleeves.Material & Surface Treatment Material: Carbon steel / 45# alloy steel, high tensile strength Standard finish: Black oxide anti-rust treatment Optional finish: Color zinc / hot-dip galvanized for anti-corrosion Core Advantages Full internal thread, uniform thread pitch, smooth assembly without jamming Extended body design, large contact area, strong anti-loosening performance under vibration Complete metric specifications M6, M8, M10, M12 up to M36, custom length on request Strict dimensional inspection, consistent tolerance for engineering matching Factory direct supply, stable stock for fast bulk delivery Application Fields Mining support equipment & tunnel bolt assembly Railway track fastener system Construction mechanical fixtures Automotive repair jigs & heavy machinery connection Steel structure engineering