What is the German equivalent of 'seal'?

The German equivalent of 'seal' in the context of something that provides a closure or prevents leaks is indeed 'Dichtung'. In various technical applications, a seal refers to a material or device that fits tightly between two surfaces, ensuring that liquids or gases do not escape.

'Dichtung' encompasses several types of seals, including gaskets and O-rings, playing a crucial role in mechanical assemblies to maintain pressure and prevent leakage. This term is widely used in engineering and manufacturing contexts where precision and reliability of seals are essential.

The other terms do not relate to seals in this context; for example, 'Kratzer' translates to 'scratch', 'Rauheit' means 'roughness', and 'Schraube' means 'screw'. Each of these terms applies to different concepts and items in design and mechanical engineering, making 'Dichtung' the correct answer for the question about the equivalent of 'seal' in German.