How is 'burr' expressed in German?

The term 'burr' refers to a rough or sharp edge that is left on a material after a cutting or machining process. In German, the word that accurately describes this phenomenon is 'Grat.' This term is commonly used in technical and manufacturing contexts to denote the unwanted protrusions or roughness on the edge of a workpiece that result from the production process.

In contrast, the other choices do not represent the concept of a burr: 'Blase' typically translates to 'blister' or 'bubble,' which is unrelated to machining; 'Massekabel' refers to a 'ground cable' in electrical contexts; and 'Kronenmutter' means 'crown nut,' which pertains to a type of fastener. These terms are distinct from the concept of a burr, making 'Grat' the correct and relevant choice for expressing this specific technical term in German.