This article provides a complete guide to the ISO 2768 tolerance standard, with a focus on the practical application of the "mH" tolerance combination.
The 'H' in ISO 2768-mh is where many engineers make mistakes. You cannot ignore geometry. For features that are not explicitly toleranced (e.g., a flat surface without a flatness callout), ISO 2768-2 applies.
: The permissible radial and axial run-out for Class H is max. Why Use the ISO 2768-mh Standard? 1. Cleaner Blueprints Instead of labeling hundreds of features with individual ±plus or minus iso 2768-mh tolerance chart
The "H" class defines the permissible limits for the form and position of features.
Determined based on the longer of the two legs forming the right angle: Nominal Length Range (mm) Perpendicularity Tolerance (mm) Parallelism (Class H) This article provides a complete guide to the
The Ultimate Guide to the ISO 2768-mh Tolerance Chart In manufacturing, clear communication prevents costly mistakes. When engineering drawings lack specific tolerances for every single dimension, manufacturers rely on general tolerance standards. is the global benchmark for these linear and angular dimensions, and the "mh" designation is one of its most widely used combinations.
These tolerances apply to broken edges, such as external radii and chamfer heights. Nominal Size Range (mm) Tolerance (± mm) Over 3 to 6 3. Angular Dimensions For features that are not explicitly toleranced (e
6 — 30: ±0.2
This article provides a detailed breakdown of the ISO 2768-mH tolerance chart, its application, and why it is crucial for design and production. 1. What is ISO 2768?
: Represents the High/Tight tolerance class for geometrical features (such as flatness, straightness, parallelism, and symmetry) [1, 4].
These tolerances apply to broken edges, including rounding radii and chamfer heights. Nominal Size Range (mm) Medium (m) Coarse (c) Very Coarse (v) ±0.2 Over 3 to 6 ±0.5 Over 6 ±1.0 Angular Dimensions