General tolerance ISO 2768 does not specify where to use these tolerances. Tolerance class is defined as per design requirements and manufacturing capability. For example: for sheet metal parts ISO 2768–mK is used. And for CNC Machining, ISO 2768–fH can be used.
- General Tolerances to DIN ISO 2768 Created Date: 4/26/2018 3:18:31 PM.
- EXAMPLE IS0 2768-mk of In this case the general for angular dimensions in ac- cordance with IS0 2768-l do not apply to right angles (900), which are implied but not indicated, because this part of IS0 2768 specifies general tolerances on perpendicularity.
- Our website uses cookies. Cookies are small text files held on your computer. They allow us to give you the best browsing experience possible and mean that we can understand how you use our site.
ISO 2768 Part 1 is intended to simplify drawing indications and it specifies general tolerances for linear and angular dimensions without individual tolerance indications in four tolerance classes. It applies to the dimensions of parts that are produced by metal removal or parts that are formed with sheet metal fabrication.
ISO 2768 Part 1 only applies to the following dimensions which do not have an individual tolerance indication:
a) linear dimensions (e.g. external sizes, internal sizes, step sizes, diameters, radii, distances, external radii and chamfer heights for broken edges);
b) angular dimensions, including angular dimensions usually not indicated, e.g. right angles (90°). unless reference to ISO 2768-2 is made, or angles of uniform polygons;
c) linear and angular dimensions produced by machining assembled parts.
It does not apply for the following dimensions:
a) linear and angular dimensions which are covered by reference to other standards on general tolerances;
Iso 2768 Mk Pdf
b) auxiliary dimensions indicated in brackets;
c) theoretically exact dimensions indicated in rectangular frames.
Note:
1. These tolerances may be suitable for use with materials other than metal.
2. When selecting the tolerance class, the respective customary workshop accuracy has to be taken into consideration.
a) linear and angular dimensions which are covered by reference to other standards on general tolerances;
Iso 2768 Mk Pdf
b) auxiliary dimensions indicated in brackets;
c) theoretically exact dimensions indicated in rectangular frames.
Note:
1. These tolerances may be suitable for use with materials other than metal.
2. When selecting the tolerance class, the respective customary workshop accuracy has to be taken into consideration.
Iso 2768 Mk Tolerance Table
3. Smaller or larger tolerances should be indicated adjacent to the relevant nominal dimensions.
4. General tolerances specified in angular units control only the general orientation of lines or line elements of surfaces, but not their form deviations.
Iso 2768 Mk Holes
5. If general tolerances in accordance with ISO 2768 shall apply, the information shall be indicated in or near the title block, such as ISO 2768-m.
