TS EN ISO 1101/AC

TS EN ISO 1101/AC is a technical corrigendum to the GPS standard for geometrical tolerancing, covering the notation of form, orientation, location and run-out tolerances. It is not a fresh requirements document on its own; rather, it corrects details in the underlying TS EN ISO 1101 text so the standard can be read and applied consistently.

How geometrical tolerancing works in practice

Geometrical tolerancing complements size tolerancing by describing not only how large a feature is, but how its shape and relationship to other features are controlled. Form tolerances limit deviations of an individual surface or axis from its ideal geometry. Orientation tolerances relate a feature to a specified datum direction or plane. Location tolerances control the position of features such as holes or slots relative to datums. Run-out tolerances address variation observed on rotating parts. In the GPS framework, these concepts provide a common language for engineering drawings and inspection.

What this corrigendum contributes

• It corrects the published standard rather than redefining the subject itself.
• It supports clearer interpretation of symbols, terminology and references used in geometrical tolerancing.
• It is tied to EN ISO 1101:2013/AC:2014.
• It serves the broader drafting and inspection workflow used in mechanical engineering drawings.

In general technical terms, this area matters because many functional requirements cannot be verified by dimensions alone. A part may meet a nominal size and still fail if its faces are not parallel enough, its holes are misplaced, or its rotating surfaces show excessive variation. Geometrical tolerancing provides the framework for expressing those relationships precisely, and this corrigendum exists to keep that framework internally consistent.