Iso 2768-mh Tolerance Chart May 2026

Here is the Tolerance Chart for Linear Dimensions:

This note tells the manufacturer: "For any dimension on this drawing that does not have a specific tolerance listed, apply the general tolerances defined by the 'm' and 'H' classes of ISO 2768." iso 2768-mh tolerance chart

This article provides a comprehensive deep dive into the ISO 2768-mH tolerance chart. We will break down what the "m" and the "H" mean, provide detailed tolerance tables, explain how to apply them, and discuss why this standard is indispensable for modern manufacturing. ISO 2768 is an international standard (International Organization for Standardization) titled "General tolerances for linear and angular dimensions and geometrical tolerances." It is designed to simplify drawing indications. Instead of writing a tolerance next to every dimension (e.g., $25.00 \pm 0.05$), the engineer simply adds a note in the title block of the drawing: "ISO 2768-mH" . Here is the Tolerance Chart for Linear Dimensions:

In the world of mechanical engineering and manufacturing, ambiguity is the enemy of efficiency. When a design engineer creates a 3D model or a 2D drawing, every dimension represents a contract between the designer and the machinist. However, if every single measurement—down to the smallest fillet and chamfer—had to be individually toleranced, drawings would become cluttered, unreadable, and tedious to produce. Instead of writing a tolerance next to every dimension (e

| Nominal Dimension Range (mm) | Tolerance

This is where the ISO 2768 standard comes into play. Specifically, for engineers working with precision parts, the designation is one of the most common and critical specifications to understand.