ISO 2768-mK is a standard for general tolerances used on engineering drawings when no specific tolerances are indicated. It combines two parts: "m" (medium) from ISO 2768-1 for linear and angular dimensions, and "K" from ISO 2768-2 for geometrical features like flatness and symmetry. Part 1: Linear Dimensions (Class "m")
Flatness & Straightness: For a length up to 100mm, the tolerance is 0.2mm. Tolerance Iso 2768 Mk Pdf
Example Table for Class K (Flatness/Straightness): ISO 2768-mK is a standard for general tolerances
: Refers to geometrical tolerances, such as straightness and flatness (Part 2). Key Tolerance Tables for "mK" 1. Linear Dimensions (Class m) All dimensions without individual tolerances follow Class m
The tolerance standard ISO 2768 has several parts, and MK is one of the commonly used specifications. The "M" in MK stands for " medium" tolerance, while "K" represents the tolerance class. The MK specification provides a set of tolerances for linear dimensions, such as lengths, widths, and heights, as well as angular dimensions, like angles and tapers.
The "m" class (Medium) is the default assumption for most machining operations using standard workshop equipment. It represents a balance between precision and manufacturability.
ISO 2768 is an international standard that provides guidelines for general tolerances in mechanical engineering. It was first published in 1989 and has since become a widely accepted standard across various industries. The standard provides a framework for specifying tolerances for linear and angular dimensions, as well as geometric tolerances.