The reference feature (e.g., A, B, C) that the tolerance is measured from. 3. Key Concepts

: Flatness, straightness, circularity, and cylindricity. Orientation : Perpendicularity, angularity, and parallelism. Location : Position and concentricity. Run-out : How much a rotating part wobbles. The Connection: Why "ISO 1101" Matters to Coffee

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While and coffee appear in search queries together, they actually belong to two completely different worlds of standardization. ISO 1101 is the international foundation for Geometric Product Specifications (GPS) , used in mechanical engineering to define tolerances for workpieces. In contrast, the coffee industry relies on a distinct suite of standards (such as ISO 3509 or ISO 6673 ) to regulate bean quality, moisture content, and sensory analysis.

Explanations of GPS standards used for teaching engineering design.

If you genuinely need for your work, focus on the official PDF from ISO or your national member body. Ignore the “coffee” keyword — it’s a statistical ghost.

: The filter basket at the bottom of the portafilter contains hundreds of microscopic holes. If some holes are larger than others, or if they are unevenly spaced, water will tunnel through the easiest path (channeling), ruining the espresso.

The theoretical area within which a feature must be contained.

Internationally, two major systems for geometrical tolerancing exist: the ISO system (followed in most of the world) and the ASME Y14.5 system (predominant in North America). ISO 1101 is the cornerstone of the ISO GPS system. When an American company exports coffee equipment to Europe, or a European manufacturer sources grinder burrs from a supplier in Asia, the engineering drawings are almost always prepared according to ISO 1101 or a national adoption thereof (e.g., DIN EN ISO 1101 in Germany, BS EN ISO 1101 in the UK, NF EN ISO 1101 in France, UNI EN ISO 1101 in Italy).

Because ISO standards are protected by copyright, they are rarely available legally for free as a standard public PDF. To get a legitimate copy of ISO 1101 or any coffee-specific ISO standard, you can visit:

The routine method for determining moisture content in roasted ground coffee by measuring loss in mass at 103 °C.