What is the correct translation for "axle" in German?

The correct translation for "axle" in German is "Achse (Bauteil)." In engineering and mechanical contexts, "Achse" specifically refers to a structural component that acts as a pivot point or a support for rotating wheels. The term "Bauteil" indicates that it is a part or component, adding clarity to its application in machinery or vehicles.

While "Radachse" can also refer to an axle specifically linked to wheels, it is a more specific term that relates primarily to the wheel axle setup rather than the broader concept of an axle as a component. "Welle" translates to "shaft," which is a different type of mechanical component used for transmitting power. Similarly, "Stütze" means "support" or "brace," which does not represent the function of an axle. Therefore, "Achse (Bauteil)" is the most appropriate translation for "axle" in a general sense within mechanical terminology.