Four calculators we use when answering bearing enquiries: rating life, speed guidance, unit conversion and tolerance ranges. They run in the browser, need no data request, and every assumption is stated on the page.
Enter the dynamic load rating, the equivalent load and the speed to get the basic rating life in revolutions and hours, or the
Open tool →Check whether a bore and speed combination is inside the usual dn guidance for the bearing type and lubrication, before you look
Open tool →Convert the units that appear on bearing data sheets and drawings: length and bore, force, torque, pressure and temperature, plus
Open tool →Turn an ISO 492 precision class into the allowed bore or outside-diameter range, and calculate ISO 286 IT-grade tolerances from
Open tool →They are screening tools: they turn a duty into numbers you can compare against a catalogue, and they show the formula so you can check the arithmetic. They are not a substitute for the manufacturer's catalogue values for a specific part number, and they do not include the life adjustment factors for lubrication, contamination and reliability. Where a decision is safety related, verify against the current standard edition and the bearing maker's data.
Need the input values? Dynamic ratings and limiting speeds are on every specification page in the catalogue.