Copper Bushing

The copper bushing, often referred to as a copper spacer, shim, or thrust washer, is a deceptively simple yet critically important component in precision assemblies. This thin-walled, cylindrical or flanged part is precision-formed from pure copper or copper alloy powders using high-accuracy compaction tooling. The powder metallurgy process ensures the product possesses excellent dimensional consistency, flatness, and parallelity across large production runs, with thickness tolerances that rival machined parts.

Its primary roles are multifaceted: acting as a wear surface between rotating components, providing precise axial spacing to set preloads or end-play, serving as a conductive interface in electrical assemblies, or functioning as a sacrificial anode in galvanic corrosion protection. The copper bushing absorbs micro-vibrations, prevents fretting wear between steel surfaces, and aids in distributing heat axially along a shaft. You will find it in applications as diverse as the commutator end of micro-DC motors, as thrust washers in manual transmissions, as conductive contact rings in slip-ring assemblies, and as precision spacers in optical and measurement devices. We supply the copper bushing in a vast array of standard and custom inner/outer diameters and thicknesses. Secondary operations like coining for ultra-flat surfaces, heat treatment for stress relief, or selective plating for soldering are readily available to meet exact mechanical and electrical specifications.

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