What is the German word for "stiff nut"?

The German word for "stiff nut" is "Quetschmutter." This term is used within mechanical and engineering contexts to refer to a type of nut that is designed to provide a tight and secure fit, often by deforming slightly when tightened. "Quetschmutter" literally translates to "squeeze nut," which aptly describes its function of gripping tightly when installed.

The other options do not relate to the term "stiff nut." For instance, "Wartungsbühne" refers to a maintenance platform, which has no relevance to fasteners. "Strebe" translates to "strut" or "brace," primarily related to structural elements, while "Taschenlampe" means "flashlight," which is unrelated to mechanical components. Understanding these distinctions helps clarify the specific contexts in which these terms are used, highlighting why "Quetschmutter" is the correct choice.