By using "mk", a manufacturer instantly knows that the component requires standard, medium-precision machining. This is typically achievable via conventional milling, turning, and drilling operations without requiring expensive secondary finishing processes like grinding or honing. Part 1: Linear Dimensions (The "m" Class)
ISO 2768-MK provides a widely accepted framework for general tolerances in engineering and manufacturing. Its application ensures that parts are produced within acceptable limits of variation, promoting quality, interchangeability, and efficiency. However, it is essential to evaluate the suitability of these tolerances on a case-by-case basis, considering the specific requirements of each application. As manufacturing technologies evolve and demands for precision increase, the principles behind standards like ISO 2768-MK will continue to guide best practices in the industry.
: If you are manufacturing a shaft with a diameter of 50 mm and the drawing calls out ISO 2768-m , the permissible diameter tolerance is ±0.3 mm . This means the final part diameter must be between 49.7 mm and 50.3 mm . general tolerance iso 2768-mk
| Code | Refers to | Tolerance Class | Typical Application | |------|-----------|----------------|---------------------| | | ISO 2768-1 (Linear/Angular) | Medium | General machining (lathe, mill, drilling) | | k | ISO 2768-2 (Geometrical) | Fine | Tighter form & position control |
ISO 2768-MK is a widely used international standard for general tolerances. It was published by the International Organization for Standardization (ISO) and provides a framework for defining general tolerances for linear and angular dimensions. By using "mk", a manufacturer instantly knows that
ISO 2768-mK is more than just a string of letters in a title block; it is a powerful tool for clear, efficient, and global communication in manufacturing. By setting default expectations for all untoleranced dimensions, it prevents costly misunderstandings between designers and producers.
Blueprints remain uncluttered. Engineers only write down explicit tolerances for critical dimensions (like bearing fits or sealing surfaces). Its application ensures that parts are produced within
These control the angular variations of intersecting lines or surfaces, measured in degrees and minutes. Length of Short Side ( Tolerance Limit for Class "m" ±1∘plus or minus 1 raised to the composed with power ISO 2768 Part 2: Geometrical Tolerances (Class "K")
: Reduces drawing clutter by only requiring specific tolerances for high-precision "functional" areas. : Parts with tighter tolerances than "mK" (such as plus or minus