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Thus, the hole must be manufactured between 40.000 mm and 40.025 mm.

is a foundational document in mechanical engineering used to ensure high-precision assembly. While it was withdrawn and replaced by newer standards like DIN EN ISO 286

In mechanical engineering and manufacturing, defining every single dimension with a specific tolerance is impractical and would clutter technical drawings. To solve this, standards bodies have established "General Tolerances" to apply to dimensions that do not have individual tolerance specifications.