When referring to tools, what does "Schlüssel" mean?

In this context, "Schlüssel" is a German term specifically used to refer to a tool that is commonly known as a wrench in English. A wrench is a device used to provide grip and mechanical advantage in applying torque to turn objects—most often rotary fasteners such as nuts and bolts. The use of "Schlüssel" in this sense aligns with how it is understood in technical and hand tool terminology, denoting a tool that is essential for tasks involving tightening or loosening.

Understanding the nuances of these terms is important, as different tools can serve similar functions yet have specific applications. The other terms, although related, refer to different types of tools or accessories. For instance, while a "spanner" may be used in some regions to mean a tool similar to a wrench, "fastener" pertains to items that secure or attach things together, which does not directly relate to the term "Schlüssel" as a tool.