Standard Iso 14253 1.pdf — International

Downloading the PDF is step one. Implementation is step two. Here is the practical workflow:

Imagine a shaft diameter with (\textLSL = 10.00\ \textmm), (\textUSL = 10.10\ \textmm), (U = 0.02\ \textmm). INTERNATIONAL STANDARD ISO 14253 1.pdf

Thus the specification limits are 10.00–10.10, but the acceptance limits for proving conformance are 10.02–10.08. Downloading the PDF is step one

The standard allows (U) at other confidence levels (e.g., 99% for safety‑critical, (k \approx 2.58)), but 95% is the default. Thus the specification limits are 10

A workpiece or instrument is declared non‑conforming if: [ y \ \le\ \textLSL - U \quad \textor \quad y \ \ge\ \textUSL + U ]

If the measured value lies between these outer limits (i.e., within (U) of the specification limit but on the “wrong” side), the standard says non‑conformance cannot be proven — it is indeterminate.