Rolling and plain bearings
Dynamic and static rolling-bearing life assessment, plus plain (journal) bearing load, clearance, Sommerfeld number and film thickness.
For rolling bearings, determine equivalent loads, calculate rating life, and check static safety. For plain bearings, check specific load, clearance and film thickness against experience values.
Calculators in this category
Hydrodynamic Journal Bearing to DIN 31652
Complete steady-state design of a hydrodynamic plain journal bearing to DIN 31652: Sommerfeld number, relative eccentricity and attitude angle, minimum film thickness, friction power, lubricant flow from self-pressure and feed pressure, and the thermal iteration for convection cooling or pressure-fed lubrication, checked against the DIN 31652-3 guide values.
Open calculator →Thrust Pad Bearing to ISO 12131
Steady-state design of a hydrodynamic thrust pad bearing to ISO 12131: load and friction characteristic values, minimum film thickness, friction power, lubricant flow with the mixing model and the bearing temperature from the heat balance for convection or recirculating lubrication, checked against the ISO 12131-3 guide values.
Open calculator →Hydrostatic Journal Bearing to ISO 12167
Hydrostatic plain journal bearing with capillary restrictors to ISO 12167-1: recess pressures from the per-recess continuity of Annex A, journal eccentricity and film thickness for a given load, stiffness, oil flow, pumping and friction power, temperatures and Reynolds checks.
Open calculator →Bearing Duty Cycle: Mean Equivalent Load
Condense a duty cycle of up to ten load steps into the mean equivalent bearing load and mean speed using the ISO 281 life exponent, with optional weighting by each step's share of revolutions, ready for the rating-life calculator.
Open calculator →Dynamically Equivalent Bearing Load (ISO 281)
Calculate the ISO 281 dynamically equivalent radial load P=X*Fr+Y*Fa from radial and axial load, selecting the applicable Fa/Fr<=e or Fa/Fr>e branch from your own catalogue X/Y/e factors, then feed P into the rating-life calculator.
Open calculator →Static Load Safety (DIN ISO 76)
Determine the equivalent static load P0 from radial and axial force and check the static load safety S0.
Open calculator →Rolling Bearing Life
Calculate bearing rating life and static safety.
Open calculator →Dynamic/Kinematic Viscosity Conversion
Convert between kinematic and dynamic viscosity using fluid density.
Open calculator →Lubricant Viscosity vs Temperature
Interpolate kinematic viscosity at a target temperature (Walther method).
Open calculator →Lubricant Viscosity vs Pressure
Estimate the pressure rise of dynamic viscosity with the Barus equation.
Open calculator →Plain Bearing Specific Load
Calculate the projected specific load of a journal bearing.
Open calculator →Plain Bearing Sliding Speed
Calculate journal surface sliding speed from diameter and speed.
Open calculator →Plain Bearing PV Value
Combine specific load and sliding speed into the PV value.
Open calculator →Plain Bearing Operating Clearance
Calculate diametral, radial and relative clearance, with optional thermal correction.
Open calculator →Journal Bearing Sommerfeld Number
Calculate the dimensionless Sommerfeld number from load, clearance, viscosity and speed.
Open calculator →Minimum Journal-Bearing Film Thickness
Calculate the geometric minimum film thickness from clearance and eccentricity ratio.
Open calculator →Plain Bearing Friction Power
Calculate friction force, torque and power from a supplied friction coefficient.
Open calculator →