The ISO 2768 standard is split into two distinct parts, each covering different aspects of geometric features. Part 1: Linear and Angular Dimensions (ISO 2768-1)
ISO 2768 is an international standard created by the International Organization for Standardization (ISO). It is officially titled: "General tolerances — Part 1: Tolerances for linear and angular dimensions without individual tolerance indications" and "Part 2: Geometrical tolerances for features without individual tolerance indications."
Values represent the allowable deviation based on the length of the shorter side of the angle. Tolerance Class Up to 10mm Over 10 to 50mm Over 50 to 120mm Over 120 to 400mm Over 400mm m (Medium) c (Coarse) v (Very Coarse) Straightness and Flatness (ISO 2768-2)
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: It ensures your drawings are interpreted the same way in a local shop as they would be in a factory halfway across the world. Caveat - Tolerance Stacking
Having a PDF version of this standard on your desktop or tablet is essential for three reasons:
Specifies coarse linear tolerances (c) and loose geometric tolerances (L). Best suited for sheet metal fabrications or rough castings. Why You Need an ISO 2768 PDF Reference The ISO 2768 standard is split into two
Ø20 ±0.1 → specific tolerance overrides general. Ø20 (no tolerance) → general ISO 2768-mK applies:
"You chose 'm' for Medium," Elias noted. "For a length between 30mm and 120mm, that gives the machinist a deviation of . In the world of high-precision synchronization,
In simpler terms, it is the default rulebook for dimensions on a drawing that do not have a specific tolerance written next to them. When a designer writes a dimension as simply 10 mm instead of 10 mm ±0.1 mm , the general tolerance defined by ISO 2768 automatically applies. Tolerance Class Up to 10mm Over 10 to
ISO 2768 is commonly used in various industries, including:
Values are in millimeters (mm) based on the length of the larger surface. Tolerance Class Up to 10mm Over 10 to 30mm Over 30 to 100mm Over 100 to 300mm Over 300 to 1000mm K L How to Read "ISO 2768-mK" on a Drawing
Note: For nominal sizes below 0.5 mm, the deviations shall be indicated directly next to the nominal dimension.
For a complete, printable version, search for or "ISO 2768-2 1989 PDF" to find the official standards documents.