Use a ______-____ _______ ______when force is required to drive it on a shaft. The ______-____ _______ ______ puts the driving force against the inner race, where it cannot do damage.

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

Answer: (B)

When seating a bearing onto a shaft, use a tool that transfers the load to the bearing’s inner race so you don’t damage the rolling elements. The sleeve-type bearing driver provides a smooth, cylindrical sleeve that fits around the inner race and applies the force evenly around it. This keeps the contact away from the balls or rollers and avoids marring or indenting the race or races, ensuring a clean, true fit.

Other tools tend to contact the bearing in ways that can cause damage: a punch-type driver concentrates force at a point on the inner race, risking indentations; a split-dowel driver isn’t designed for bearing seating; a hammer-on driver relies on blows, which can be uncontrolled and can misalign or nick the bearing. So the sleeve-type driver is the best choice for safe, controlled seating.