ISO 2768-mK is commonly utilized in the manufacturing of sheet metal components, while manufacturers of machined components may opt for ISO 2768-fH.
is a canyon. The gears are seizing because your 'General Tolerance' was too generous." Geometry of Silence
Limits the displacement between two opposing features. For class H, the symmetry limit is 0.5mm; for class K, it is 0.6mm; and for class L, it is 0.6mm.
ISO 2768 is an international standard created by the International Organization for Standardization (ISO). It provides general geometric and linear tolerances for technical drawings where specific tolerance values are not explicitly stated next to a dimension. Iso 2768 General Tolerances Pdf
Comprehensive Guide to ISO 2768 General Tolerances: Understanding and Implementing the Standard
The ISO 2768 standard is divided into two distinct parts. A complete drawing callout usually references both (e.g., ISO 2768-mK ). Part 1: Linear and Angular Dimensions (ISO 2768-1)
If a specific feature on that same drawing requires a higher level of precision, the engineer must explicitly write out the target tolerance (e.g., ISO 2768-mK is commonly utilized in the manufacturing
To apply these standards, the tolerance designation must be added to the technical drawing (usually near the title block). ISO 2768-mH This indicates: m : Medium Class for Linear/Angular dimensions (Part 1). H : Class H for Geometrical tolerances (Part 2). Best Practices
The ISO 2768 standard is divided into two main parts, each addressing a different type of tolerance.
While this document provides a detailed breakdown of the standard's contents, technical requirements, and application guidelines, please note that it is an educational summary. To obtain the official, certified of the standard, you must purchase it from the International Organization for Standardization (ISO) store or authorized distributors like the ANSI Webstore or BSI. For class H, the symmetry limit is 0
He then flipped to , which covers Geometrical Tolerances —things like flatness, symmetry, and circular run-out.
| Nominal Size Range (mm) | f (Fine) | m (Medium) | c (Coarse) | v (Very Coarse) | |------------------------:|:--------:|:----------:|:----------:|:---------------:| | 0.5 up to 3 | ±0.05 | ±0.10 | ±0.15 | — | | over 3 up to 6 | ±0.05 | ±0.10 | ±0.20 | ±0.50 | | over 6 up to 30 | ±0.10 | ±0.20 | ±0.50 | ±1.00 | | over 30 up to 120 | ±0.15 | ±0.30 | ±0.80 | ±1.50 | | over 120 up to 400 | ±0.20 | ±0.50 | ±1.20 | ±2.50 | | over 400 up to 1000 | ±0.30 | ±0.80 | ±2.00 | ±4.00 | | over 1000 up to 2000 | ±0.50 | ±1.20 | ±3.00 | ±6.00 | | over 2000 up to 4000 | — | ±2.00 | ±4.00 | ±8.00 |
: Covers linear and angular dimensions , such as external and internal sizes, radii, and chamfer heights.
– Medium (Most common in general mechanical engineering) c – Coarse v – Very Coarse