Knowledge Answer

How do tolerances in the housing bore and shaft impact the performance of a wave spring designed to be 'Bore-Piloted'?

2026-06-16 FAQ

For a bore-piloted wave spring, the outside diameter ($OD$) of the spring is the primary datum. The housing bore must be sized to accommodate the $OD$ at its maximum radial expansion (at solid height). If the bore is too tight ($D_{bore} < OD_{max}$), the spring will 'hoop' and seize, causing the spring rate to spike. Conversely, if the bore is too loose,...

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For a bore-piloted wave spring, the outside diameter ($OD$) of the spring is the primary datum. The housing bore must be sized to accommodate the $OD$ at its maximum radial expansion (at solid height). If the bore is too tight ($D_{bore} < OD_{max}$), the spring will 'hoop' and seize, causing the spring rate to spike. Conversely, if the bore is too loose, the spring can shift off-center, leading to an uneven load $P$ across the wave peaks. In precision assemblies, a tolerance of H7/h6 is often targeted for the bore, and the spring $OD$ is specified with a tolerance that accounts for the manufacturing variation of the flat wire width $b$.

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