Qi Sheng coupling nuts are used to connect two threaded rods or extend threaded assemblies, commonly seen in construction, anchoring systems, and general mechanical installations. Their elongated body provides sufficient thread engagement for secure connections when properly specified.
We offer coupling nuts across common thread standards and sizes, with material and surface finish options for different environments. Bulk purchasing and OEM packaging are available for projects and distribution.
Send the thread size, required length style, material/finish, and quantity to receive pricing and lead time.

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DIN6334 Long Hex Coupling Nut
DIN6334 Long Hex Coupling Nut

DIN6334 Long Hex Coupling Nut

  1. Complies with ISO 8673, DIN 6334, ANSI B18.2.2; bolt extension/docking fasteners
  2. Material: Carbon steel (45#), stainless steel (304/316), alloy steel (42CrMo); strength grades 4.8–12.9
  3. Structure: Long hexagonal body + full-through internal thread (coarse/fine) + end chamfers (for guiding)
  4. Surface treatments: Zinc plating, black oxide, passivation, hot-dip galvanizing
  5. Size M4–M36, length 10–100mm (longer than standard nuts)
Round Coupling Nut Connecting Nut
Metal round coupling nuts for mechanical connections, high-quality hardware components.

Round Coupling Nut Connecting Nut

  1. Bolt extension/docking fasteners
  2. Material: Carbon steel, stainless steel (304/316), brass; strength grades 4.8–10.9
  3. Structure: Cylindrical (round) body + full-through internal thread (coarse/fine) + chamfered ends
  4. Surface treatments: Zinc plating, black oxide, passivation, chrome plating
  5. Size M4–M36, length 10–80mm