fitments

Fitment is a noun referring to a component, device, or accessory that is installed or fitted into a larger system to enable its function. The term is widely used in manufacturing, construction, and trade to describe items that are added to existing structures or equipment. In building and architecture, fitments commonly denote fixtures and fittings installed in a space, such as plumbing fixtures, lighting fixtures, doors, handles, and cabinet hardware.

In automotive and mechanical contexts, fitment can describe the compatibility and mounting configuration of components. For example, wheel fitment covers the combination of wheel size, bolt pattern, offset, and overall diameter that must align with a vehicle. Similar considerations apply to other parts that must fit precisely with the host system, such as engine components, accessories, or mounting brackets. The concept is central to procurement, specification, and retrofitting, where correct fitment ensures performance, safety, and ease of installation.

Fitments are typically designed to meet relevant standards and tolerances and are specified by part numbers, sizes, thread types, and materials. They may be permanent elements of a structure or detachable items that can be swapped or upgraded. In practice, fitment choices affect compatibility, maintenance access, and long-term reliability. Related terms include fittings, fixtures, and hardware, which describe broader categories of components used to equip and complete a system.

Etymology traces fitment to fit, with the suffix -ment, indicating a thing that is fitted or installed.