Which tool is used to drive a bearing onto a shaft without damaging the inner race?

• A. punch-type bearing driver
• B. split-dowel bearing driver
• C. sleeve-type bearing driver
• D. hammer-on driver

Answer: (C)

To drive a bearing onto a shaft without damaging the inner race, use a bearing driver that distributes the force evenly across the inner race. A sleeve-type bearing driver provides a smooth, cylindrical surface that fits over the inner race and backs the force with a proper shoulder, allowing you to press the bearing onto the shaft without contacting or deforming the race edges. This even contact helps prevent brinelling and keeps the bearing concentric with the shaft. Other tools aren’t as protective: a punch-type driver concentrates impact on a small point and can dent the race; a hammer-on driver relies on direct hammer blows that can damage the race; a split-dowel driver isn’t intended for bearing press fits onto shafts. The sleeve-type driver offers the safest, most controlled installation.