Iso 2768 General Tolerances Pdf Jun 2026

This means the component must be manufactured using linear tolerances and Class K (k) geometric tolerances. Example: ISO 2768-fH

This part covers length, width, diameters, radii, and angles. It defines four tolerance classes based on the desired precision level: For high-precision components. m (medium): The most common standard for general machining.

When a manufacturer looks at the title block of an engineering drawing, they will often see a designation written like this: . Here is how to decode it:

As of 2025, the 1989 versions are still current. ISO has not superseded these standards. Always check the ISO website for the latest "Status: Current". Iso 2768 General Tolerances Pdf

| Range of Nominal Length of Shorter Side (mm) | Grade H | Grade K | Grade L | | :--- | :--- | :--- | :--- | | up to 100 | 0.2 | 0.4 | 0.6 | | >100 up to 300 | 0.3 | 0.6 | 1.0 | | >300 up to 1000 | 0.4 | 0.8 | 1.5 | | >1000 up to 3000 | 0.5 | 1.0 | 2.0 |

ISO 2768-1 focuses on linear dimensions (such as external sizes, internal sizes, step heights, and diameters) and angular dimensions. It divides manufacturing accuracy into four distinct tolerance classes: – Fine

The correct format is simply the standard number followed by the chosen tolerance class, e.g., "ISO 2768-mK". By putting this on your drawing, you are instructing any manufacturer who reads it that: This means the component must be manufactured using

Always cross-reference a downloaded third-party PDF with official documentation before using it to program CNC machinery or approve quality control batches. A single typo in a downloaded chart can result in costly manufacturing defects. Conclusion

Explain how to using calipers or a CMM

The is more than just a document; it is the silent language of precision engineering. It tells your machinist exactly how much error is acceptable without forcing you to label every single line on your blueprint. m (medium): The most common standard for general machining

Every manufacturing process has inherent variations. Forcing engineers to specify a unique tolerance for every single edge, hole, and radius on a blueprint is highly inefficient.

Regulates the alignment of two features relative to a center plane. How to use ISO 2768 in your Project

| Range of Nominal Length of Shorter Side (mm) | Fine (f) | Medium (m) | Coarse (c) | Very Coarse (v) | | :--- | :--- | :--- | :--- | :--- | | up to 10 | ±1° | ±1° | ±1°30' | ±3° | | >10 up to 50 | ±0°30' | ±0°30' | ±1° | ±2° | | >50 up to 120 | ±0°20' | ±0°20' | ±0°30' | ±1° | | >120 up to 400 | ±0°10' | ±0°10' | ±0°15' | ±0°30' | | >400 | ±0°5' | ±0°5' | ±0°10' | ±0°20' |

That said, for engineering reference and workshop use, you can find "equivalent" or "summary" PDFs for free. Search for:

: Covers linear and angular dimensions , such as external and internal sizes, radii, and chamfer heights.