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Focuses on linear and angular dimensions. It specifies four tolerance classes: (very coarse) Part 2 (ISO 2768-2):

Below are the standard tolerance values used across different dimension ranges. All values are in millimeters (mm). 1. Linear Dimensions

Designers do not have to guess standard machining capabilities, and machinists do not have to halt production to ask about missing tolerances.

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Table 2: Permissible Deviations for Broken Edges (External Radii and Chamfers) Values are in millimeters (mm). Tolerance Class 0.5 to 3mm ±plus or minus ±plus or minus ±plus or minus m (Medium) ±plus or minus ±plus or minus ±plus or minus c (Coarse) ±plus or minus ±plus or minus ±plus or minus v (Very Coarse) ±plus or minus ±plus or minus ±plus or minus Table 3: Permissible Deviations for Angular Dimensions

Disclaimer: This write-up is for educational purposes. For official manufacturing and quality control, always refer to the official ISO 2768 PDF document purchased from an authorized standards body (such as ISO.org or ANSI).

ISO 2768-1 categorizes tolerances into four classes, often referred to by their letters:

is the international standard for general tolerances, designed to simplify engineering drawings by providing default permissible deviations for dimensions without individual tolerance callouts. Core Parts of the Standard The standard is divided into two distinct parts: Part 1 (ISO 2768-1): linear and angular dimensions , such as lengths, diameters, radii, and chamfers. Part 2 (ISO 2768-2): geometrical tolerances

ISO 2768-2 defines three tolerance classes for geometrical tolerances.

: General tolerances for symmetry match the perpendicularity values.

Choosing "Fine" (f) for an entire assembly when "Medium" (m) is sufficient will drastically increase manufacturing rejection rates and production costs without adding functional value. Where to Download the ISO 2768 General Tolerances PDF

This part of the standard is the most commonly referenced. It categorizes tolerances into four . The choice of class depends on the manufacturing process and the industry standards.