The static load number is calculated according (ISO 76, 2006) and ( ISO/TR 10657, 1991). It is only for documentation and only used in the calculation of static safety factor if the static safety is not calculated based on stresses (see settings “Calculate static safety factor based on stresses”). It is also used in one case for track roller calculation, see that section for details.
If the option for hybrid bearing is selected in the bearing options dialog, the static load capacity is calculated according to (ISO/FDIS 20056-2, 2017), leading to larger static load capacities in case of silicon nitride rolling elements with Youngs Modulus larger than 300GPa . Note that (ISO/FDIS 20056-2, 2017) also uses higher values for recommendations of static safety factors.
The static load number is based on a permissible stress which can be changed at inputs for material data.
For bearings with low speed higher loads are permitted sometimes. For example, (ISO 1002, 1983) allows a radial force of over five times the static load capacity for nonrotating ball bearings.