The entire uncertainty interval must lie completely inside the specification limits.

| | Details | | :--- | :--- | | International Organization for Standardization (ISO) | The authoritative source; the latest confirmed version as of 2026 is ISO 14253-1:2017 | | National Standards Bodies | e.g., BSI (UK), DIN (Germany), ANSI (USA) | | Commercial Standards Retailers | e.g., Intertek Inform , Accuris , Techstreet |

ISO 14253‑1 is supported by other important documents:

, which is technically revised but still found in many legacy contracts. iTeh Standards Related Guides in the Series ISO 14253 is part of a larger series under Geometrical Product Specifications (GPS) INTERNATIONAL STANDARD ISO 14253-1

Outline how ISO 14253-1 compares to (the American equivalent).

Identify the upper and lower tolerance limits (USL and LSL) from the engineering drawing.

If you can extract the text or key tables from your PDF, I can provide a with the above summary or answer very specific questions (e.g., “How does ISO 14253-1 define ‘measurement uncertainty’ in clause 3.7?”).

The GPS system ensures that a designer can specify a tolerance on a drawing, and a manufacturer can measure the resulting part and confidently decide if it meets that tolerance, using a globally agreed-upon set of rules. ISO 14253-1 provides the final, critical step in this process: the decision rule.

To claim a part is good (conforming), the measured value must be within the specification limits by a margin equal to the measurement uncertainty. Proving Nonconformity: