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International Standard Iso 14253 1.pdf May 2026

ISO 14253‑1 is a fundamental standard within the Geometrical Product Specification (GPS) system. It establishes decision rules for verifying whether a manufactured workpiece or a measuring instrument conforms to a given specification limit (e.g., upper or lower tolerance limit) when measurement uncertainty is present.

The key purpose is to resolve ambiguity: No measurement is perfect. Even with a high‑quality measuring system, there is always uncertainty. ISO 14253‑1 tells industry how to decide “pass” or “fail” while accounting for that uncertainty — thereby reducing false acceptances (consumer risk) and false rejections (producer risk). INTERNATIONAL STANDARD ISO 14253 1.pdf

The standard applies to:

It explicitly refers to ISO/IEC Guide 98‑3 (Guide to the Expression of Uncertainty in Measurement, GUM) for evaluating measurement uncertainty. ISO 14253‑1 is a fundamental standard within the

To account for uncertainty, the actual decision limits may be narrower than the specification limits (for proving conformance) or wider (for proving non‑conformance). These are called acceptance limits. It explicitly refers to ISO/IEC Guide 98‑3 (Guide

  • Interpretation: The measurement result is too close to the limit to be certain. It is mathematically impossible to prove conformance or non-conformance without reducing the measurement uncertainty.
  • Verdict: Neither conformance nor non-conformance is proved.

    • ISO 14253-1 creates three distinct zones based on the measurement result ($y$) and the expanded measurement uncertainty ($U$). The limits of specification are defined as the Upper Specification Limit ($USL$) and Lower Specification Limit ($LSL$).