Iso 2768-mh Tolerance Chart [verified] Jun 2026

What is ISO 2768? | CNC Machining Tolerance Standards - Fictiv

Because the second letter is "H", the part is subject to strict geometrical controls for features like Straightness, Flatness, Perpendicularity, and Symmetry. Nominal Length Range (mm) Geometric Tolerance (in mm) Up to Over Over Over Over Over

Imagine a machined part with a 50 mm long shaft and a flat base. On the drawing, the general tolerance note is "ISO 2768-mH".

Note: This applies to external radii and chamfer heights (not edge radii). Dimension Length (mm) Tolerance m (Medium) (mm) Above 0.5 up to 3 Above 3 up to 6 Above 6 up to 30 Above 30 up to 120 Table C: Angular Dimensions (ISO 2768-1) iso 2768-mh tolerance chart

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The designation is composed of two parts from the ISO 2768 standard: Standard Tolerances in Manufacturing: ISO 2768 & ISO 286

This article serves as a comprehensive guide to interpreting and applying the ISO 2768-mH standard, offering detailed charts for linear dimensions, angles, and geometrical tolerances. What is ISO 2768-mH? ISO 2768 is divided into two primary parts: What is ISO 2768

Permissible deviations for linear dimensions except for broken edges. Dimension Length (mm) Tolerance m (Medium) (mm) Above 0.5 up to 3 Above 3 up to 6 Above 6 up to 30 Above 30 up to 120 Above 120 up to 400 Above 400 up to 1000 Above 1000 up to 2000 Table B: External Radii and Chamfer Heights (ISO 2768-1)

The first part of the standard, ISO 2768-1, defines four tolerance classes for linear and angular dimensions: – Fine m – Medium c – Coarse v – Very Coarse

Implementing ISO 2768-mh in your workflow offers several distinct advantages for design engineers and CNC machinists: On the drawing, the general tolerance note is "ISO 2768-mH"

These tolerances apply to external/internal sizes, diameters, and distances. Values are in millimeters ( skolarium.com Nominal Size Range ( Medium (m) Tolerance plus or minus 0.1 plus or minus 0.1 plus or minus 0.2 plus or minus 0.3 plus or minus 0.5 plus or minus 0.8 plus or minus 1.2 plus or minus 2.0 ISO 2768-1: Broken Edges (External Radii & Chamfers) Nominal Size Range ( Medium (m) Tolerance plus or minus 0.2 plus or minus 0.5 plus or minus 1.0 ISO 2768-2: Geometric Tolerances (Class "H")

Notes:

These values apply to the total deviation allowed over the longest surface length. Nominal Length Range (mm) 0.02 Over 10 to 30 0.05 Over 30 to 100 0.1 Over 100 to 300 0.2 Over 300 to 1000 0.3 Over 1000 to 3000 0.4 Perpendicularity

In the world of engineering and manufacturing, tolerances play a crucial role in ensuring that parts and assemblies fit together properly. One of the most widely used tolerance standards is ISO 2768, which provides a set of general tolerances for linear and angular dimensions. In this blog post, we'll take a closer look at the ISO 2768-MH tolerance chart and its applications.