Precision Bearing System Tolerance Calculator - Standards and RPM

The below precision bearing system tolerance calculator is to support engineers in the initial stages of their product design. The below bearing, shaft, and housing tolerances are per ABEC / DIN / ISO standards. There is also a built in RPM tolerance adjustment. The RPM adjustment factor is done per GMN internal standards and experience to insure a proper inner race press fit at high RPM’s. Inner race slippage can cause premature bearing failure for a super precision bearing application.

Every application may have specifics that need to be taken into account to adjust a standard system tolerance strategy to unique parameters. Please contact GMN Bearing USA Ltd engineers for technical support and questions.

Note: There is also a Precision Bearing System Tolerance Calculator – Thermal Effects to support engineers in applications with higher (or lower) temperatures.

General Parameters

Calculate Tolerances by Part Number

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...or by bearing attributes

Enter your shaft RPM

Calculate Clear
Shaft Tolerancing
Nominal diameter tolerance[μm]
Axial runoutt2
Mean surface roughnessRa
Part Number
Housing Tolerancing
Nominal diameter tolerance –
Fixed bearing OD
Nominal diameter tolerance –
Floating bearing OD
Axial runoutt2
Mean surface roughnessRa
GMN Recommended Shaft Tolerance Correction for Application RPM - utilizing n · dm factor*
Bearing dm [mm]Application n · dmCorrected Nominal Interference [μm]Corrected Nominal Diameter Tolerance [μm]

*There are many factors that go into proper tolerancing; bearing size, RPM, temperature, materials, duty cycle, etc. All can play a role in proper tolerancing. This page is designed to be a guide for general applications. GMN Bearing USA Ltd. and it's partners are not held liable for the use of this tool.

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