For a length up to 100mm, the 'k' class allows a 0.2mm deviation.
ISO 2768 is an international standard created by the International Organization for Standardization. It provides a set of general tolerances for linear and angular dimensions without individual tolerance indications.
The 'k' class generally allows a symmetry deviation of 0.6mm. Run-out: Circular run-out for class 'k' is typically 0.2mm. Why use ISO 2768-mk? general tolerance iso 2768-mk
Refers to Part 2 of the standard, covering Geometrical tolerances (like flatness, symmetry, and run-out). The 'k' is the class for general geometrical tolerances. ISO 2768-1: Linear Dimensions (The 'm')
Parts made from plastics or materials with high thermal expansion (the standard is primarily designed for metal removal/machining). Dimensions where safety or critical function is at stake. For a length up to 100mm, the 'k' class allows a 0
It provides a universal language between designers and manufacturers worldwide, ensuring that a part made in Germany fits a part made in the USA. When NOT to use it
It signals to the machine shop that standard workshop accuracy is sufficient for non-critical areas, preventing over-processing and reducing costs. The 'k' class generally allows a symmetry deviation of 0
ISO 2768-mk is the "Goldilocks" of manufacturing tolerances—not too tight, not too loose. It ensures that parts are functional and interchangeable without unnecessary manufacturing expenses. When you see it on a drawing, you’re looking at a standard of and Medium Geometrical control .
Understanding ISO 2768-mk: The Standard for General Tolerances
It keeps drawings clean. Only critical dimensions (like a bearing fit or a sealing surface) need specific ± tolerances.