Coupling nuts are threaded fasteners used to join two male threads, most commonly threaded rod. The outside of a coupling nut is typically a hex so it can be driven with a wrench. Coupling nuts are also used to make up long rod assemblies from shorter lengths of rods. Available in coarse and fine thread.
Coupling nut dimensions are described by the industrial fastener institute in standard IFI-128.
A coupling Reducer Nut differs from a standard coupling nut, in that the diameter and pitch on each end is different. This is used to connect threaded rods of different sizes.
Coupling Reducer Nuts listed below are case hardened (CR+3) Zinc Plated A563 Grade A Steel.
Sizes listed as: Diameter - Pitch Min. to Diameter-Pitch Max (Width Across Flats x Length)