When moving or installing a bearing with a hammer and drift, what material should the drift (punch) be made of?

Using a drift made of mild steel is ideal for moving or installing bearings with a hammer because it provides a combination of strength and ductility. Mild steel can absorb impacts without shattering or cracking, which is essential when applying force to delicate components like bearings. Additionally, mild steel won't deform as easily as softer materials, ensuring that it provides a solid striking surface that transmits energy effectively to the bearing.

In this application, a punch or drift made from mild steel protects both the bearing and the drift itself from damage. Importantly, it also allows for controlled installation without excessive risk of fracturing or damaging the component being installed.

Other material options may not deliver the same benefits: aluminum could flatten easily under impact, brass might deform too readily, and carbon steel, while strong, runs a higher risk of chipping or cracking under heavy use if not properly treated. Thus, mild steel strikes the right balance for this task, making it the preferred choice.