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Code:
The designation consists of two distinct parts that cover different aspects of part manufacturing:
This section covers linear dimensions (lengths, widths, diameters) as well as angular dimensions. The standard is divided into four classes based on precision:
The title block of all engineering drawings shall contain the following note:
Represents the tolerance class for geometrical features (form and position). The uppercase letter 'K' is a specific class for features like flatness, straightness, and symmetry. ISO 2768 Part 1: Linear and Angular Tolerances (Class m)
Understanding where 'mk' fits in the hierarchy helps designers choose correctly.
By including a simple note like "ISO 2768-mK" on the drawing, an engineer communicates a clear, globally understood set of rules. This standard defines acceptable ranges of deviation for everything from a part's length and width to the straightness of its surfaces and the accuracy of its angles, ensuring that parts are manufactured consistently and fit together as intended. Its primary goal is to simplify drawing indications and ensure the basic interchangeability of components.
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