Typical shaft-bearing combinations

SNL housings in the 30, 31 and 32 series can accommodate different shaft-bearing combinations:
Plain shaft with bearing on an adapter sleeve
For this arrangement (fig. 1), housings, appropriate parts and dimensions are listed in the product tables for bearings on an adapter sleeve (with standard seals) and for bearings on an adapter sleeve (with oil seals)).
Stepped shaft with bearing on a cylindrical seat

For this arrangement (fig. 2), housings, appropriate parts and dimensions are listed in the product table for bearings on a cylindrical seat.

The bearing is located axially between a shaft shoulder and a spacer sleeve, which is held in place by another component on the shaft. The outside diameter of the sleeve must match the bore diameter of the seal. The sleeve is not supplied by SKF.

Stepped shaft with bearing on a withdrawal sleeve
When using an SNL housing for this arrangement (fig. 3), the withdrawal sleeve must be located axially on the shaft. This can be done using a spacer sleeve that is held in place by another component. Using a lock nut can be difficult because of the limited space in the housing. The outside diameter of the spacer sleeve must match the bore diameter of the seal. The spacer sleeve is not supplied by SKF.
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