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Our thermal range calculator shows engineers how the material of the bearing, housing and shaft will grow or shrink when in operation.

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The top section of the calculator uses installation temperatures and ABEC / DIN / ISO standards. The bottom section applies the temperature input and calculates how the materials will attempt to grow or shrink.

Note that this information is provided within the free state of the materials. There will be some variation from the below due to resistance between the materials; this should be taken into consideration.

For additional help with finding the right component for your application, contact our engineers.

Quick Tip About Housing Temperature

If you have a standard application and are unsure of the housing temperature, use the ambient temperature of the room that houses your spindle and place that into the temperature field. Add an additional 10°C for the shaft temperature. This 10°C increase for shaft temperature will usually provide a good estimate for the running temperature increase.

Note: High n*dm applications and high load applications may produce more than a 10°C difference between the shaft and housing temperature.

General Application Notes for Precision Bearings

1. The ID of the bearing should rarely float on the shaft. A line fit is an ideal minimum for many applications to prevent inner race slipping.

2. The OD of the bearing should usually have a slight gap during installation. This gap will ensure space for heat and centrifugal force expansion.

3. The suggested generic nominal install tolerances are a ~3 micron press fit on the ID and a ~4 micron gap on the OD. This is an “ideal” scenario and can be expensive and/or difficult to machine. Adjust the values for bearing size, speed, temperature, and other possible application specifics.

4. A positive resultant number above implies a GAP where a negative number implies INTERFERENCE.

5. If you have a standard application and are unsure of the housing temperature, use the ambient temperature of the room that houses your spindle and place that into the temperature field. Add an additional 10°C to the shaft temperature to allow for the increase in temperature from when the shaft is in operation. High n*dm applications and high load applications may have a higher temperature delta between the shaft and housing.

6. 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 is a guide for general applications. GMN Bearing USA and its partners make no representations or warranties of any kind regarding the tool and information contained on this page. Any use or reliance upon this tool and information shall be at the sole risk of the user and GMN Bearing USA Ltd. shall have no liability whatsoever with respect to any decisions or actions made by the user based on results obtained from this tool and information.

Helpful Tools & Resources

Angular Contact Bearing Cross Reference Tool
Interchange Chart for Angular Contact Bearings
Engineering Resources
Bearing Tolerance Standards

General Parameters

°C °F
°C °F
°C °F
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Bearing PN
Bearing Mat'l
Shaft Mat'l
Housing Mat'l
10-6/°C 10-6/°F
10-6/°C 10-6/°F
10-6/°C 10-6/°F
Bearing CTE 10-6/°C 10-6/°F
Shaft CTE 10-6/°C 10-6/°F
Housing CTE 10-6/°C 10-6/°F

Tolerance at Installation Temperatures

Shaft

mm in
mm in
mm in
mm in
Bearing ID Min mm in
Bearing ID Max mm in
Shaft Min mm in
Shaft Max mm in
mm in
mm in
mm in
Max Gap mm in
Max Interference mm in
Nominal mm in

Housing

mm in
mm in
mm in
mm in
Bearing OD Min mm in
Bearing OD Max mm in
Housing Min mm in
Housing Max mm in
mm in
mm in
mm in
Max Gap mm in
Max Interference mm in
Nominal mm in

Width

mm in
mm in
mm in
Bearing W Min mm in
Bearing W Max mm in
Nominal mm in

Tolerance at Running Temperatures Calculate Clear

Shaft

mm in
mm in
mm in
mm in
Bearing ID Min mm in
Bearing ID Max mm in
Shaft Min mm in
Shaft Max mm in
mm in
mm in
mm in
Max Gap mm in
Max Interference mm in
Nominal mm in

Housing

mm in
mm in
mm in
mm in
Bearing OD Min mm in
Bearing OD Max mm in
Housing Min mm in
Housing Max mm in
mm in
mm in
mm in
Max Gap mm in
Max Interference mm in
Nominal mm in

Inner Race Width

mm in
mm in
mm in
Bearing W Min mm in
Bearing W Max mm in
Nominal mm in

Outer Race Width

mm in
mm in
mm in
Bearing W Min mm in
Bearing W Max mm in
Nominal mm in

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. 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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