Iso 8015 |top| Jun 2026

Officially titled ISO 8015 is the foundational document for all other geometrical tolerance standards.

"Each specified requirement on a drawing shall be met independently, unless a particular relationship is specified." iso 8015

: A dimensional tolerance (like a diameter) does not control form deviations (like roundness or straightness) unless a specific relationship is explicitly defined. Officially titled ISO 8015 is the foundational document

If you work with technical drawings, you are likely familiar with GD&T (Geometrical Dimensioning and Tolerancing). You know the symbols, the feature control frames, and the tolerance zones. But do you know the fundamental rules that govern how those tolerances are interpreted? You know the symbols, the feature control frames,

In 1985, the International Organization for Standardization (ISO) published a document that seemed, on its surface, dry as dust: .

ISO 8015 did more than standardize tolerances. It changed engineering culture. It forced engineers to think like lawyers and metrologists to think like logicians. Every dimension now had to answer three questions: