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Company News About Fixing a Bearing That Won't Fit on a Shaft: Causes & Solutions

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Contacts: Ms. Shelley Dong

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2026-03-31

Common Causes

1.Overly Tight Fit: Shaft is too large or bearing bore is too small.

2.Poor Installation: Force applied unevenly or at an angle.

3.Damaged Parts: Shaft or bearing is dented, burred, or out-of-round.

4.No Lubrication: High friction from dry surfaces.

Proven Solutions (In Order)

1.Use the Right Tools.

Press the bearing on using a proper sleeve or adapter that contacts only the inner ring.
Never hammer the bearing directly or press on the outer ring.

2.Apply Heat to the Bearing.

Heat the bearing to 80–120°C (e.g., in an oil bath) to expand its inner ring. This is the most effective method for tight fits.

3.Lubricate the Shaft.

Apply a thin film of assembly paste or light oil to the shaft to reduce friction during the final push.

4.Check Your Measurements.

Use a micrometer to verify the actual shaft diameter and bearing bore match the required tolerance.

If the Bearing Gets Stuck:

Stop immediately. Do not force it.
Remove it carefully with a puller.
Inspect both parts for scratches or debris, clean them, and restart with the correct method.

Prevention Tips

Beining Intelligent Technology (Zhejiang) Co., Ltd

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No.502,Xinxing Third Road,Cixi Intelligent Home Appliance High Tech Industrial Development Zone, Zhejiang,China

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