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Calculate the Press Fit Tolerances for Your Shaft & Housing Unit

Machine your shaft and housing unit within the recommended tolerances to achieve the right ball-bearing press fit for your application.

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Why is it important to perform tolerance calculations?

High-speed applications produce a high centrifugal force that causes the inner ring of a bearing to expand. This could cause a press-fit bearing to turn into a bearing slipping on the shaft. If this results, then drastic machine malfunctions could occur. It’s important that the inner ring of the bearing stays pressed into the shaft during operation.

This calculator helps you find the right machined shaft and housing tolerance recommendations to ensure a press fit is achieved. The RPM adjustment factor is based on GMN ball bearing standards and our many years of bearing experience.

Check out our Thermal Range Calculator to see how materials will grow and/or shrink when in operation. Contact our on-site engineers for additional assistance.

Helpful Tools & Resources

Engineering Resources
Bearing Tolerance Standards
Angular Contact Bearing Cross Reference Tool

General Parameters

Calculate Tolerances by Part Number

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...or by bearing attributes


Enter your shaft RPM

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Precision Bearing System Tolerance Calculator
Precision Bearing Tolerance Calculator
Shaft Tolerancing
Nominal diameter toleranceNominal diameter tolerance[μm]
CylindricityCylindricityt1
Axial runoutAxial runoutt2
ConcentricityConcentricityt3
Mean surface roughnessMean surface roughnessRa
Specifications
Part Number
RPM
Housing Tolerancing
Nominal diameter tolerance –
Fixed bearing OD		Nominal diameter tolerance[μm]
Nominal diameter tolerance –
Floating bearing OD		Nominal diameter tolerance
CylindricityCylindricityt1
Axial runoutAxial runoutt2
ConcentricityConcentricityt3
Mean surface roughnessMean 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]
    

DISCLAIMER: GMN Bearing USA, Ltd. (“GMN”) makes this calculator and other engineering guides, tools and information available on the gmnbt.com website (collectively, the “Tools”) to help engineers save time and design better products. This calculator and the other Tools are provided for information purposes only and are subject to change. Neither this calculator nor any other Tools are intended to offer engineering or technical advice, be a substitute for product design, analysis and selection by engineering professionals, or to serve as an instruction from GMN as to the selection of a particular GMN product. By its use of this calculator, user acknowledges that proper tolerancing is influenced by many factors not accounted for by this calculator including, but not limited to, bearing size, RPM, temperature, materials, and duty cycle. THIS CALCULATOR IS PROVIDED “AS-IS” WITHOUT ANY WARRANTY WHATSOEVER. THE INFORMATION PROVIDED BY THIS CALCULATOR IS PROVIDED FOR THE CONVENIENCE OF USERS, BUT SHOULD NOT BE USED TO SERVE AS AN INSTRUCTION FROM GMN AS TO THE SELECTION OF A PARTICULAR GMN PRODUCT OR AS A SUBSTITUTE FOR PROFESSIONAL ENGINEERING OR TECHNICAL ADVICE. WHILE EFFORTS HAVE BEEN MADE TO MAKE THE INFORMATION PROVIDED BY THE CALCULATOR ACCURATE, GMN DOES NOT WARRANT THE ACCURACY OF THE INFORMATION OBTAINED FROM THE CALCULATOR. USER ASSUMES ALL RISKS AND RESPONSIBILITIES FOR THE USE OF AND RESULTS OBTAINED FROM THE CALCULATOR. GMN MAKES NO WARRANTY THAT THE CALCULATOR WILL BE ERROR FREE OR FREE FROM INTERRUPTION OR FAILURE. TO THE MAXIMUM EXTENT PERMITTED BY APPLICABLE LAW, GMN DISCLAIMS AND EXCLUDES ALL REPRESENTATIONS, WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND NONINFRINGEMENT WITH RESPECT TO THE CALCULATOR. USER ACKNOWLEDGES THAT THE CALCULATOR MAY NOT BE AVAILABLE OR MAY BECOME UNAVAILABLE DUE TO ANY NUMBER OF FACTORS. THEREFORE, GMN EXPRESSLY DISCLAIMS ANY EXPRESS OR IMPLIED WARRANTY REGARDING SYSTEM AND/OR CALCULATOR AVAILABILITY, ACCESSIBILITY, OR PERFORMANCE.

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