How to Choose Your Bearing from the Standard Bearing Sizes?

Bearing is one of the most essential parts, which is mostly used for reducing friction and enabling a smooth rotation/movement of various parts including shafts. The bearing size is the most important element that should be considered while selecting a bearing for any particular application.

The majority of engineers utilize the bearing size compare table SKF (ขนาด ตาราง เทียบ เบอร์ bearing skf, term in Thai) to determine the standard SKF bearing sizes, which are easily accessible and have several benefits, including compatibility with existing machinery and ease of replacement. In Thailand, Nooseng Co., Ltd. represents SKF bearing.

How to select the bearings?

1. Understand your application requirements

Before delving into bearing sizes, it is crucial to fully understand the requirements of your application. Consider a few factors such as:

  • Load capacity
  • Rotational speed
  • Operating environment
  • Temperature
  • Any other special conditions that the bearing may encounter.

The proper size bearing to use relies on the particular requirements of your application because different bearings are made to handle different loads and speeds.

2. Consult bearing manufacturer catalogues


Most bearing manufacturers provide comprehensive catalogues that include detailed information about their standard bearing sizes, along with their load and speed ratings.

These catalogues also specify the type of bearing, materials used, and other technical specifications. Consult these catalogues to find bearings that meet your application requirements.

Many manufacturers also offer online tools to help you select the appropriate bearing size based on your application data.

3. Determine the bearing type


Bearings come in many different types, such as:

  • Ball bearings
  • Roller bearings
  • Plain bearings
  • Thrust bearings.

Each has its particular characteristics and uses. Consider aspects including load direction, axial and radial loads, and the potential for misalignment in your application when selecting the proper type.

Different bearing types have distinct size ranges, so knowing the type you need will narrow down your selection.

4. Load and speed ratings


Two critical factors in bearing selection are the load and speed ratings. The biggest load that a bearing can support before permanently deforming or failing is referred to as its load rating.

Speed rating, on the other hand, indicates the maximum rotational speed a bearing can handle without overheating or causing premature wear. Compare these ratings with your application’s requirements to find a suitable bearing size.

5. Consider clearance and fit


The internal distance between the raceways and rolling elements is referred to as bearing clearance. Proper clearance ensures smooth operation and compensates for thermal expansion.

Fit refers to the amount of interference between the bearing and its housing or shaft. A proper fit prevents excessive movement and reduces vibration.

Consulting bearing manufacturer guidelines will help you determine the appropriate clearance and fit for your application.

6. Review lubrication requirements


Lubrication is essential for reducing friction and preventing premature wear in bearings. Different bearing sizes and types may require specific lubrication types and intervals.

Consider your application’s lubrication capabilities and requirements when selecting the bearing size.



Choosing the appropriate bearing size from standard bearing sizes involves understanding the above. Taking the time to select the right bearing size will result in improved performance, extended bearing life, and reduced maintenance costs for your machinery or equipment.