Glossary
The basics of ISO Tolerancing with functional approach

Nominal model; digital model (1.1)

Digital model giving the ideal shape of the part in medium dimensions.

Pièce réelle ; real part (1.1)

Real part to be checked, identified by measuring points in a measurement frame.

Reference system; Datum system (1.1, 4.1)

Set of primary, secondary and tertiary references used to position the nominal model on the actual part.

Reference element, datum element (1.1)

Actual part surface used as reference.

Specified surface (1.1)

Surface whose defects must be limited to avoid failure.

Élément tolérancé; toleranced element (1.1)

Specified surface or surface associated with the specified...