An accessory like a locknut primarily serving a mechanical function is referred to as what?

An accessory like a locknut, which primarily serves a mechanical function, is classified as a fitting. Fittings are components used to connect various sections of conduit or piping and can accommodate a variety of functions, including mechanical connections, the prevention of physical movement or loosening under stress, and maintaining structural integrity in electrical systems.

In the case of a locknut, its primary purpose is to secure the conduit in place and ensure that it does not become detached, enhancing the overall stability of the installation. This mechanical function exemplifies why fittings are crucial in electrical and plumbing applications, where a reliable connection is necessary for safety and efficiency.

While other terms like conduit connectors and couplings refer to components that join sections of conduit, they might not encompass all fittings, especially those that do not directly connect two conduit segments. The terms rainproof and watertight describe features related to the environmental protection of enclosures but do not focus on the mechanical connection aspect that is fundamental to the definition of a fitting. Thus, recognizing a locknut as a fitting aligns correctly with its role and function in installation.