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ISO 2768m General Tolerances PDF: A Complete Guide for CNC Machining and Sheet Metal Fabrication

If you are a CNC machinist or a sheet metal worker, you know how important it is to follow the correct tolerances for your parts. Tolerances are the allowable deviations from the nominal dimensions of a part, and they ensure that the parts fit and function properly. However, specifying individual tolerances for every dimension on a drawing can be tedious and time-consuming. That’s why there is a standard that simplifies the drawing indications and specifies general tolerances for linear and angular dimensions without individual tolerance indications. This standard is called ISO 2768m.

In this article, you will learn what ISO 2768m is, what are the tolerance classes and ranges, how to apply it to your drawings, and how to download the PDF file of the standard for free.

What is ISO 2768m?

ISO 2768m is an international standard made by the International Organization for Standardization (ISO), which consists of two parts: ISO 2768-1 and ISO 2768-2. ISO 2768-1 specifies general tolerances for linear and angular dimensions without individual tolerance indications in four tolerance classes: f (fine), m (medium), c (coarse), and v (very coarse). ISO 2768-2 specifies general geometrical tolerances for features without individual tolerance indications in three tolerance classes: H, K, and L.

The purpose of ISO 2768m is to simplify the drawing indications and reduce the number of tolerances required. It applies to the dimensions of parts that are produced by metal removal or parts that are formed with sheet metal fabrication. It does not apply to dimensions that have individual tolerance indications, auxiliary dimensions, or theoretically exact dimensions.

What are the tolerance classes and ranges?

The tolerance classes and ranges depend on the type of dimension and the nominal length. The tables below show the permissible deviations for linear dimensions, external radii and chamfer heights, and angular dimensions according to ISO 2768-1. The tables are based on the web search results .

If you need to specify geometrical tolerances for some features that are not covered by ISO 2768-2, or if you need smaller or larger tolerances than the general ones, you can indicate them using the symbols and modifiers according to ISO 1101. For example, if you need to specify a flatness tolerance of 0.01 mm for a surface, you can write next to the surface.

How to download ISO 2768m General Tolerances PDF for free?

If you want to download the PDF file of ISO 2768m General Tolerances for free, you can use the following link:

ISO 2768 1 & 2 – ISO General Tolerances Chart (PDF) – DEK

This link will take you to a website that provides a free PDF file of ISO 2768-1 and ISO 2768-2, which includes the general tolerances for linear and angular dimensions and geometrical tolerances. You can download the file by clicking on the download button or by right-clicking on the link and choosing “Save link as”.

You can also use this link to view the PDF file online without downloading it. You can zoom in and out, scroll up and down, and search for keywords using the toolbar at the top of the page.

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