What is the difference between a precision universal joint and a coupling

Over the years, customers often purchase universal joints, which are confused with couplings. What is the difference between universal joints and couplings:

A universal joint is a type of coupling for mechanical transmission parts. It can be said that a universal joint belongs to a coupling.

There are many types of couplings, which include plum blossom couplings, expansion couplings, elastic couplings, parallel couplings, diaphragm couplings, universal couplings, etc., all of which are couplings. Different, the selection and use conditions are also different.

Universal joints are also called universal couplings. Universal couplings are mostly used in applications with high torque and poor concentricity between the two shafts.