TS EN ISO 6284

TS EN ISO 6284 is a technical drawing standard concerned with the indication of limit deviations in construction drawings. In practical terms, it helps dimensions be read not only as nominal values but also as limits with permitted upper and lower deviations, reducing ambiguity in fabrication, assembly, and inspection. This edition is based on EN ISO 6284:1999 and has since been withdrawn.

What limit deviations mean in technical drawing

In general technical use, a limit deviation defines the acceptable range of a dimension. On a drawing, that range is conveyed by showing the nominal size together with the upper and lower deviations, so the permitted dimensional envelope is clear. This is especially important when components must fit together reliably, because the drawing then communicates the allowable variation directly instead of leaving it to interpretation.

Why this matters for construction drawings

Construction drawings act as the common language between design intent and site execution. Clear indication of limit deviations supports consistent understanding of production tolerances, assembly clearances, and checking dimensions on the same document. As indicated by the title and scope, the standard is focused on how this information is presented in construction drawings, supporting consistency in drawing practice and dimensioning notation.

• Helps dimensions be read together with their acceptable range.
• Reduces ambiguity in how a dimension is interpreted.
• Makes it easier to reference the same limit values in fabrication and inspection.
• Supports more orderly and comparable presentation of dimensions in construction drawings.