Precision spacer or shim used in preload mechanisms to control axial clearance and maintain proper bearing tension.
A precision-engineered thin component inserted between mechanical parts in preload mechanisms to establish and maintain precise axial spacing, eliminate unwanted clearance, and ensure optimal bearing preload. It compensates for manufacturing tolerances and thermal expansion while preventing excessive friction or slack in rotating assemblies.
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Spacers maintain fixed distances between components, while shims are adjustable thickness components used for fine-tuning preload. In preload mechanisms, shims are often used to achieve exact bearing compression.
Measure the axial gap with precision gauges, then select a shim thickness that provides 0.002-0.015mm interference fit for ball bearings, or follow manufacturer's preload specifications for specific bearing types.
Yes, but stacking increases tolerance stack-up and may reduce stability. Single-piece shims are preferred for critical preload applications to maintain parallelism and reduce interface points.
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