The ISO 2768 standard defines general tolerances for linear and angular dimensions to simplify technical drawings by removing the need for individual tolerance indications for every feature. It ensures that parts are manufactured within a reasonable accuracy range suitable for most general mechanical engineering purposes. Core Parts of ISO 2768
The standard is divided into two distinct parts, often cited together (e.g., ISO 2768-mK) in a drawing's title block:
ISO 2768-1: Specifies tolerances for linear and angular dimensions, such as diameters, distances, and radii. Iso 2768 General Tolerances Pdf
ISO 2768-2: Specifies geometrical tolerances for features without individual indications, covering straightness, flatness, perpendicularity, symmetry, and run-out. Tolerance Classes
Each part uses specific tolerance classes to define the level of precision: General Tolerance - ISO 2768 1 & 2 - ZEISS Quality Forum The ISO 2768 standard defines general tolerances for
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ISO 2768 (full title: ISO 2768: General Tolerances) is an international standard that specifies general tolerances for linear and angular dimensions without individual tolerance indications on technical drawings.
It applies when a designer does not write a specific tolerance next to a dimension. Instead, the drawing notes "ISO 2768" or "General tolerances ISO 2768-mK" (or similar) in the title block.