Precision Bearing System Tolerance Calculator - Thermal Effects

The below precision bearing system tolerance calculator is created to support engineers during the design of a product that may see a large thermal range. The top section is based off of installation temperatures and ABEC / DIN / ISO standards. The lower section applies the temperature input and shows an engineer how the materials will attempt to grow / 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 under consideration.

For standard applications where more accurate specifications are not known, the ambient temperature of the room where the spindle is used can be utilized for the Housing temperature and an additional 10°C increase can be used as the Shaft temperature. This 10°C rise in shaft temperature will generally make up for increased running temperatures. High n*dm applications and high load applications may have a higher temperature delta between the shaft and housing.

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

Note: There is also a Precision Bearing System Tolerance Calculator – Standards and RPM to support engineers in applications with less severe temperature conditions.

General Parameters

°C °F
°C °F
°C °F
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10-6/°C 10-6/°F
10-6/°C 10-6/°F
10-6/°C 10-6/°F

Tolerance at Installation Temperatures

Shaft

mm in
mm in
mm in
mm in

mm in
mm in
mm in

Housing

mm in
mm in
mm in
mm in

mm in
mm in
mm in

Width

mm in
mm in
mm in

Tolerance at Running Temperatures Calculate Clear

Shaft

mm in
mm in
mm in
mm in

mm in
mm in
mm in

Housing

mm in
mm in
mm in
mm in

mm in
mm in
mm in

Inner Race Width

mm in
mm in
mm in

Outer Race Width

mm in
mm in
mm in

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 install. This gap will ensure space for heat and centrifugal force expansion.
3. The generic suggested nominal install tolerances are a ~3 micron press fit on the ID and a ~4 micron gap on the OD. This is an "ideal" world and can be expensive/difficult to machine. These values should be adjusted 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. For standard applications where more accurate specifications are not known, the ambient temperature of the room where the spindle is used can be utilized for the Housing temperature and an additional 10°C increase can be used as the Shaft temperature. This 10°C rise in shaft temperature will generally make up for increased running temperatures. 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 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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