Thread Types
Right-Hand Threads: The most common type, where the nut tightens by turning clockwise.
Left-Hand Threads: Used in applications where right-hand threads might loosen due to rotational forces.
Some coupling nuts may have a combination of right-hand and left-hand threads for specialized applications.
Standards and Specifications
ISO Standards: Many coupling nuts conform to international standards such as ISO 4035.
ASTM Standards: In the US, ASTM standards (such as ASTM A563 for carbon and alloy steel nuts) might apply.
For specialized applications, custom sizes and specifications can be manufactured.
Materials
Steel: Offers high strength and is often used in structural applications. It can be zinc-plated for corrosion resistance.
Stainless Steel: Provides excellent corrosion resistance and is used in environments exposed to moisture or chemicals.
Brass: Known for its corrosion resistance and electrical conductivity, often used in plumbing and electrical applications.
Aluminum: Lightweight and corrosion-resistant, suitable for applications where weight is a concern.
Applications
Construction: Used to connect threaded rods in structural assemblies, scaffolding, and framework.
Plumbing: Helps in extending threaded pipes or rods in plumbing installations.
Electrical: Used in electrical installations to join conduits or rods.
Mechanical Assemblies: Common in machinery and equipment where extension of threaded components is needed.
