Load carrying capacity

SNL 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, or if the housing is not supported over its entire base, be sure that the magnitude of the load is permissible for the housing, the cap bolts and the attachment bolts. When housings are subjected to cyclic loads or dynamic imbalance, contact the SKF application engineering service.

Breaking loads and safety factors

Guideline values for the breaking loads of housings made of grey cast iron are listed in the product tables for
The limits for P apply only when the housing is not supported over its entire base.
The load Pa is the axial breaking load of the housing. If the incorporated bearing is mounted on a sleeve, check the permissible axial load for the sleeve.
For housings made of spheroidal graphite cast iron, the values obtained from the product tables for

Safe loads

In some countries, safe loads are used instead of breaking loads. Approximate safe loads are listed in table 1. These guideline values have been established using accepted engineering practices, taking safety, ultimate tensile strength of the materials and working stresses into account. They reflect a safety factor of 5 against fracture, and a minimum factor of 2 against cap bolt yield

Additional housing support

When a 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 55° and 120°, or when the axial loads are greater than 5% of P180° (→ product tables for
Recommendations for the position and size of the holes to accommodate dowel pins are provided in the product tables for

Load carrying capacity of the cap bolts

Approximate values for the yield points for cap bolts are provided in table 2. The values apply to 8.8 class cap bolts, which are supplied with SNL housings made of grey cast iron. SSNLD housings made of spheroidal graphite cast iron are supplied with 10.9 class cap bolts. For these cap bolts, the values obtained from the product tables should be multiplied by a factor of 1,4.
If a safety factor of 6 is used for the permissible load of grey cast iron SNL housings, the cap bolts do not need to be considered. In this case, the permissible load of the housing is less than the permissible load for the cap bolts.
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