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What is the difference between ABEC 3 and C3? Does the fit get better going up to C4 or down to C2?

April 26, 2017abec C2 C3 C4 fit going

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What is the difference between ABEC 3 and C3? Does the fit get better going up to C4 or down to C2?

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ABEC 3 is an AMBA tolerance class. C3 is an internal clearance specification. Fit is the relationship between the bearing bore and outside diameters to the housing bore and shaft outside diameter. Tolerance, clearance and fit are independent dimensions, although in some cases choosing a larger internal clearance can allow you to use a tighter interference fit. Please contact NTN engineering for details.