What does bushing mean?
A bushing is a cylindrical sleeve or lining — typically made of bronze, steel, rubber, nylon, or porcelain — that fits into a hole in a machine or structure to serve as a bearing surface, guide, spacer, or insulator. In automotive and industrial machinery, bushings cushion moving parts such as shafts and pivot pins, absorbing vibration and reducing friction and wear between components; a degraded suspension bushing, for instance, produces looseness and clunking in a vehicle's handling. In electrical engineering, the term describes insulating fittings, often ceramic, through which conductors pass into grounded enclosures such as transformers and switchgear. Almost entirely technical in register, the word appears chiefly in maintenance manuals, parts catalogs, and repair estimates rather than casual conversation. It is closely related to the shorter form "bush," which serves the same function and is more common in British usage. For anyone reading a mechanic's report or an equipment specification, understanding what a bushing does helps explain why so many small, inexpensive rings play an outsize role in how smoothly machines run.
nounA cylindrical sleeve or lining, typically of metal, rubber, or other durable material, fitted into a housing or around a shaft to reduce friction, provide insulation, or act as a bearing surface.
- A cylindrical sleeve or liner, usually of metal or rubber, inserted into a machine housing or around a shaft to serve as a bearing, reduce wear, or provide vibration isolation.
- (In electrical engineering) A hollow insulating fitting through which a conductor passes, allowing it to enter or exit an enclosure safely.
"The mechanic replaced the worn rubber bushings in the suspension to eliminate the clunking noise over bumps."
"The worn suspension bushings allowed the wheels to shift slightly, making the steering feel loose."
"Each high-voltage cable enters the transformer through a porcelain bushing that insulates it from the metal casing."
Regular plural; used freely when referring to multiple sleeve components, e.g., across a vehicle's suspension system.
"All four control-arm bushings were cracked and needed replacement."
That tiny rubber ring under your car that costs a few dollars can make a whole vehicle feel like it's falling apart when it wears out — mechanics call it a bushing.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of bushing
The noun "bushing" arises from "bush," the older English term for a metal lining or sleeve fitted into a hole, a sense recorded from the early nineteenth century. The ultimate source is generally traced to related forms in Low German and Dutch — such as Dutch "bus," meaning a box, cylinder, or barrel-like container — which supplied several similar workshop terms to English trades vocabulary. The extended form "bushing," with its diminutive-style -ing suffix, became the standard term in American engineering usage, while British engineers often retain the bare form "bush." A distant relative in this same Germanic lineage is "bushel," the dry-measure word that passed through Old French before entering Middle English.
Related word forms
How bushing is actually used
"Bushing" is almost exclusively a technical term, encountered in automotive repair, machining, plumbing, and electrical engineering contexts. It carries no figurative or everyday idiomatic use, and laypeople most often meet it on a mechanic's invoice. In British engineering usage "bush" alone is sometimes preferred for the plain bearing sense, while "bushing" remains standard in American practice.
Easily confused with bushing
Brushing refers to applying a coat with a brush or a light sweeping contact, while a bushing is a mechanical sleeve used in machinery.
Pushing means exerting force to move something, whereas a bushing is a hardware component that lines a hole or supports a shaft.