Understanding ISO 2768-mK: The Standard for General Tolerances in Manufacturing
The designation combines two different parts of the standard:
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400 to 1000 mm: ±2.0 mm
This prevents "over-tolerancing," which can lead to unnecessarily high manufacturing costs by requiring tighter precision than the part's function demands. Exceptions: general tolerance iso 2768-mk
Therefore, when you see in a drawing title block, it means the component must be manufactured to Medium linear tolerances and Medium geometric tolerances . ISO 2768-m (Part 1): Linear and Angular Dimensions
The lowercase letter "m" represents the "Medium" tolerance class. ISO 2768-1 outlines four tolerance classes for linear dimensions: f (Fine), m (Medium), c (Coarse), and v (Very Coarse).
These values are determined by choosing the longer of the two surface lengths or the diameter of the cylindrical part. Nominal Length Range (mm) Straightness & Flatness Tolerance (mm) for Class "k" Over 10 to 30 Over 30 to 100 Over 100 to 300 Over 300 to 1000 Over 1000 to 3000 2. Perpendicularity
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This article provides an exhaustive deep dive into , explaining what it means, when to use it, how to interpret its tables, and its real-world implications for CNC machining, quality control, and design engineering.
ISO 2768-1 features four tolerance classes: fine (f), medium (m), coarse (c), and very coarse (v). The "m" class balances manufacturing feasibility with functional precision.
Perpendicularity tolerances are determined by the longer of the two sides forming the right angle: Nominal Length Range (mm) Tolerance Class Up to 100 Over 100 to 300 Over 300 to 1000 Over 1000 to 3000 Symmetry and Run-out
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The uppercase represents the tolerance class for geometrical characteristics (Part 2). Deconstructing ISO 2768-mK
If you’ve seen "ISO 2768-mk" in the title block of a blueprint, What is ISO 2768?
Implementing this standard provides significant advantages across design and production workflows: