TS 2955 ISO 2692

TS 2955 ISO 2692 is a withdrawn standard that addresses the maximum material principle within geometrical tolerancing in technical drawings and its application. In practical engineering terms, this concept helps define how size and geometry interact when a feature must still satisfy assembly and functional fit requirements; it is about interpreting not only the size of a feature, but also the geometric consequences tied to that size.

What the maximum material principle means in drawing practice

In general technical use, the maximum material principle is a geometrical tolerancing concept used to state how the permitted geometric tolerance is interpreted when a feature contains the greatest amount of material. It is commonly applied to mating features such as holes and shafts, where maintaining functional clearance or assembly compatibility matters. As the actual size departs from the maximum material condition, additional geometric tolerance may become available, which makes the rule especially useful in tolerance design and interchangeability planning.

What this standard covers in context

The scope of this standard is limited to the maximum material principle and its application. In the broader language of technical drawing, that places it within the core framework of geometrical product specification, alongside related concepts such as form, location, and datum referencing. Used together with standards like ISO 1101, ISO 5458, ISO 5459 and ISO 8015, it supports clear communication of functional requirements in mechanical engineering drawings without replacing the need for the underlying dimensional and geometrical specification system.

• Part of the technical vocabulary used in geometrical tolerancing.
• Helps relate size tolerances to allowable geometric variation.
• Especially relevant for mating holes, shafts and assembly fit.
• This record is based on ISO 2692:1988 plus Amendment 1:1992 and is now withdrawn.