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how to install bearing into pillow block

In the mechanical design and manufacturing industry, pillow block bearings are very common parts. They are primarily used to reduce friction in machine elements and to support torque or weight. Like many other mechanical components, their proper installation and maintenance are critical. Whether you are a mechanical engineer, a hobby maker or a DIYer, proper installation of bearings into pillow blocks is critical to your productivity and the life of your mechanical parts. This article will guide you through the steps on how to install a bearing into a pillow block.

Here are the steps to install the bearings into the pillow blocks:

Step 1: Preparations

Before starting the installation, please make sure to do the following preparations:

① You need to ensure that all the bearings and pillows you install are cleaned. This not only ensures load carrying capacity, but also prevents miscalibration, scratches and other surface damage. You can lightly rub the surface with sandpaper or an abrasive cloth.

② You need to further clean all the tools and working area to ensure that there is no dust and other debris that will contaminate any part during the installation process.

③Keep a tidy working area for quick and accurate maintenance on future tasks in the future.

Step2: Insert the Bearings into the Pillow

Now that you have all your tools and work area ready and the bearings and pillows cleaned, all we have to do now is insert the bearings into the pillows.

Here are the specific steps:

① Distribute the steel balls evenly in the grooves in the inner ring of the bearing, and then gently place the bearing on the pillow block.

② Pay attention to the direction in which the bearings are placed to ensure they are inserted into the pillow block correctly. Usually, bearings are marked with arrows or letters to indicate the correct installation direction.

③ Press the bearing lightly and evenly by hand to insert the bearing into the pillow block. Since the bearing inner ring fits tightly with the steel balls, insertion is very easy if done well.

Step 3: Verify the Depth of Bearing Insertion

Once you have inserted the bearing into the bolster, you will need to verify that the bearing is inserted to the correct depth.

Here are the specific steps:

① Use a caliper to measure the diameter of the inner ring (id) of the bearing. This is necessary to ensure that your selection of bearings is correct. In general, for a given size bearings, their inner diameter should be fixed.

② Use a caliper to measure the diameter (od) of the pillow block hole. Also, by measuring the bore of the pillow block, you can be sure that you are choosing the correct bearing.

③ Make sure the size of the bearing inner ring matches the inner diameter of the pillow block sleeve and the bearing is fully sunk into the pillow block.

Step 4: Tighten the auxiliary nut

After completing the bearing installation process, you need to tighten the auxiliary nut that locks the bearing.

Here are the specific steps:

① Move the auxiliary nut to different positions to achieve the purpose of adjusting the bearing position.

② When you find the correct position, please tighten the auxiliary nut. Note that adjustments must be made very carefully to ensure that the bearings continue to hold their correct position.

③ Once the auxiliary nut is tightened, the bearing can work normally.

Of course, the above content is a guiding process. If you encounter a special situation, please be sure to adjust and apply it based on your own knowledge and sense of practice.


When it comes to installing bearings into pillow blocks, you need to be well prepared, pay attention to every detail, and be careful throughout the process in order to produce a job that will please you. By following the steps above, you will be able to properly install the bearings into the pillow block and be ready for any subsequent maintenance. Whether you’re an amateur fabricator or a professional engineer, these tips will secure your work.

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