TS EN ISO 1101

TS EN ISO 1101 is a geometrical tolerancing standard that sets out the basic rules for defining and presenting tolerances of form, orientation, location and run-out on workpieces. In practical engineering terms, it supports the common language of Geometrical Product Specifications so that features such as flatness, angular alignment, position and rotational variation can be controlled independently of size.

What these tolerance types mean in practice

Geometrical tolerances are used when size alone is not enough to define function. A part may meet its dimensional size and still fail to assemble or perform correctly if its surface form, axis direction or feature location is outside the intended limits. In the GPS framework, these characteristics are expressed through symbols, tolerance zones and datum references, allowing design, production and inspection to communicate the same intent. This standard addresses the basic rules for that geometric language.

Why the distinction matters

• Form tolerances limit the intrinsic shape of a feature.
• Orientation tolerances control the angle or parallelism of a feature relative to a reference.
• Location tolerances define the nominal placement of a feature and its tolerance zone.
• Run-out tolerances help control the variation of a rotating surface or axis.
• The rules support consistent interpretation of symbols and indications on technical drawings.

The standard covers the basic information used for geometrical tolerancing of workpieces, so its value lies in how geometry is specified rather than in prescribing inspection equipment or a single measurement method. In general technical use, this subject is central to precision engineering, assemblies with tight fit requirements, and any application where dimensional accuracy must be complemented by geometric control. This record is based on the 2005-referenced edition of TS EN ISO 1101 and is now withdrawn.