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Stepped sleeves

Stepped sleeves are pressure joints with two slightly different inside diameters that mate with a stepped shaft. An interference fit maintains the sleeve’s position axially and determines its axial load carrying capacity. The stepped design of the fitting surface simplifies alignment during mounting but also facilitates dismounting when using the oil injection method.

Stepped sleeves do not create any stresses that might reduce the running accuracy of a shaft, but do enhance shaft stiffness. They are typically used in very high speed, lightly loaded applications where there are minimal shock loads. Compared to threaded lock nuts, stepped sleeves provide superior mounting accuracy, provided the sleeve and its seats are manufactured to the appropriate specifications, and the sleeve is mounted correctly.

SKF does not supply or manufacture stepped sleeves, but design recommendations and suitable dimensions are provided in the following sections.

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