ISO 2768 is designed to simplify drawings and reduce costs. However, it's not for every single dimension. The standard applies to the following types of dimensions when they have an individual tolerance:
ISO 2768-1 defines four tolerance classes, ranging from highly precise to coarse. These classes are designated by lowercase letters: – Fine m – Medium c – Coarse v – Very Coarse
When a drawing specifies "ISO 2768" in its title block, manufacturers instantly know the acceptable limits for every unmarked dimension, angle, and geometric feature. This streamlines communication between design offices and machine shops worldwide. Why Use General Tolerances?
This comprehensive guide provides a starting point. For definitive use in production, always refer to the latest official standards purchased from an authorized reseller. Iso 2768 General Tolerances Pdf
The permissible variations below are listed in millimeters (mm) and apply to nominal sizes. Tolerance Class 0.5 to 3mm 30 to 120mm 120 to 400mm 400 to 1000mm 1000 to 2000mm m (Medium) c (Coarse) v (Very Coarse) Table 2: Broken Edges (External Radii and Chamfer Heights)
For a visual summary of the tolerance tables, you can view this General Tolerance Guide ZEISS Quality Forum specific numerical values
Engineers and machinists frequently seek out a downloadable for several vital reasons: ISO 2768 is designed to simplify drawings and reduce costs
Controls how flat or straight a surface must be.
Weeks later, the Aeon Key hummed to life. The gears didn't just fit; they glided. Leo realized then that ISO 2768 wasn't just a PDF in a folder—it was the invisible boundary where human imagination meets the hard limits of metal.
Used for precision machining and high-end components. These classes are designated by lowercase letters: –
This part focuses on the "size" of features. It is divided into four tolerance classes, ranging from very precise to coarse. Tolerance Classes
To apply these rules, you must include a note in your drawing's title block. It usually looks like this:
As of 2025, the 1989 versions are still current. ISO has not superseded these standards. Always check the ISO website for the latest "Status: Current".