Load carrying capacity
SAF and SAW housings are intended for loads acting perpendicularly toward the support surface. If the housing is supported over its entire base and the loads are purely perpendicular, loads are limited only by the bearing.
If loads acting in other directions occur, check that the magnitude of the load is permissible for the housing and the attachment bolts. Guideline values for the safe loads of the housings are provided in the product tables for:
The safe loads have been calculated using a safety factor of 5 against fracture and a factor of 2 against cap bolt yield. For housings made of spheroidal graphite cast iron the values obtained from the product tables should be multiplied by a factor of 1,8.
If the housing is not supported over its entire base, the load carrying capacity for vertical loads may be affected. For additional information, contact the SKF application engineering service.
For a purely axial force, static or dynamic, the permissible load on the pillow block housing should not exceed 65% of P180°. If the incorporated bearing is mounted on a sleeve, check the permissible axial load for the sleeve.
When housings are subjected to cyclic loads or dynamic imbalance, contact the SKF application engineering service.
Additional housing supportWhen the housing is subjected to loads acting parallel to the support surface, it may be necessary to pin the housing to the support surface or to provide a stop to counter the load.
When loads act at angles between 60° and 120°, or when the axial loads are greater than 25% of P180°, the housing should be pinned to the support surface or a stop should be provided to counter the load. The dowel pins or stop should be sufficiently strong to accommodate the loads acting parallel to the support surface. Dimples indicating the recommended positions for dowel pins are cast into the base of the housing.