13C100

13C100 — is a designation in the “DTFR Tolerance” system that indicates a specific class of part accuracy. The first digit 13 denotes the nominal size range ≈13 mm, the letter C defines a medium tolerance level, and the suffix 100 sets a maximum deviation of 100 µm. This tolerance is suitable for assemblies where moderate precision is required, such as bearings, bushings, or engine fastenings. When selecting a component, you should ensure that its geometry conforms to this class to avoid excessive wear or assembly issues.