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Beware of "free PDF" sites. The ISO 286 standard is updated periodically (the 2010 version is current as of this writing, but check for amendments). Outdated versions may contain errors in the IT grade formulas or missing size ranges.
The numerical tables required to calculate deviations are highly complex and cannot be memorized. A certified copy of the ISO 286 PDF is a mandatory tool for:
In ISO 286, the terms "hole" and "shaft" are used abstractly:
ISO 286 PDFs are available for purchase from ISO member bodies worldwide, such as:
You can obtain localized versions from organizations like DIN (Germany), ANSI (USA), BSI (UK), or AFNOR (France). These versions are identical in technical tables but may include localized translations or forewords. Public Reference Material iso 286 pdf
The magnitude of the tolerance zone, denoted by numbers (e.g., IT01 to IT18).
on linear sizes, specifically for cylindrical features (holes and shafts) and parallel surfaces
This comprehensive guide breaks down the core components of the ISO 286 standard, its practical applications, and how to correctly interpret its complex engineering tables. What is ISO 286?
Tables for (indicated by lowercase letters, e.g., g6). Data for nominal sizes up to 3150mm. 3. Key Concepts in ISO 286 Beware of "free PDF" sites
. It provides a standardized alphanumeric code system (e.g.,
Common uses: High-precision location fits where parts must be accurately aligned but can still be disassembled with a rubber mallet. Interference Fit (Press Fit)
When reviewing tables, you will typically see the following columns: Nominal Size Range (mm): E.g., over 10 up to 18. Fundamental Deviation: The top or bottom limit deviation.
The current version of ISO 286 is divided into two main parts, with the latest editions published in 2010: The numerical tables required to calculate deviations are
The algebraic difference between a size and the nominal size.
When you see Ø25 H7 , you are looking at a hole with:
ISO 286 uses an to designate tolerances. This system communicates both the tolerance zone width and its position relative to the nominal dimension.
In a clearance fit, the shaft is always smaller than the hole, ensuring there is always a gap between the two components. This allows for relative rotation or sliding movement (e.g., a rotating shaft inside a sleeve bearing). Example combination: H7/g6 Transition Fit
: Defining the precise clearance or interference required for a rotating part. CNC Machining
