ISO 2768-1 defines four classes of tolerances. As you move from "f" to "v," the tolerance becomes looser (more deviation allowed).
solves this problem. It is the international standard that defines General Tolerances —tolerances that apply automatically to dimensions that do not have an individual tolerance indication. This allows engineers to focus on critical dimensions while ensuring non-critical features remain functional and manufacturable.
Other combos: -fH , -cL , -vK , etc.
Having a PDF version of this standard on your desktop or tablet is essential for three reasons:
The most common standard for general engineering. c (Coarse): Used for rough parts or non-mating surfaces. Iso 2768 General Tolerances Pdf
Designations, like in a title block, define the required precision level. Part 1 covers linear and angular, while Part 2 covers geometric requirements, with levels ranging from high-precision to coarse. ISO 2768 General Tolerance Guide | PDF - Scribd
To legally bind a manufacturer to these general tolerances, you must explicitly state the standard and the desired classes in or near the drawing title block. ISO 2768-1 defines four classes of tolerances
The official ISO document runs 50+ pages. The useful PDF is only 2 pages . If your PDF is longer than 4 pages, you are reading the wrong cheat sheet.
In the title block or general notes:
The format is . For example, "ISO 2768-mK" is a very common designation.
for your PDF reference:
