BS EN ISO 2692:2021 + Ex Comm

This kit includes the BS EN ISO 2692:2021 as well as Expert commentary.

What is BS EN ISO 2692:2021 about?

Part of ISO’s geometrical product specifications series, BS EN ISO 2692:2021 is the latest revision of one of the key geometrical tolerancing standards and covers maximum material requirements.

Who is BS EN ISO 2692:2021 for?

Mechanical engineers, design engineers, and engineering designers who work in the aerospace, defence, automotive, rail, nuclear and medical devices sectors Engineering or manufacturing organizations that need to produce engineering drawings (using 2D manual drawings or 3D CAD-generated models) in their product design and development processes Independent design consultancies and design agencies Users of the former national standard, BS 308, who are updating their practice

What does BS EN ISO 2692:2021 cover?

It defines the maximum material requirement (MMR), the least material requirement (LMR) and the reciprocity requirement (RPR). These requirements can only be applied to linear features of size of cylindrical type or two parallel opposite planes type.

These requirements are often used to control specific functions of workpieces where size and geometry are interdependent, for example to fulfil the functions “assembly of parts” (for MMR) or “minimum wall thickness” (for LMR). However, the MMR and LMR can also be used to fulfil other functional design requirements.

This latest version deals with some frequently occurring workpiece functional cases in design and tolerancing. The “maximum material requirement” (MMR) can cover, for example, “assemblability” and the “least material requirement” (LMR) can cover, for example, “minimum wall thickness” of a part.

MMR and LMR requirements can accurately simulate the intended function of the workpiece by allowing the combination of two independent requirements into one collective requirement or to directly define maximum material virtual condition (MMVC) or least material virtual condition (LMVC). In some cases of both MMR and LMR, the “reciprocity requirement” (RPR) can be added.

Why should you use BS EN ISO 2692:2021?

It allows engineers and engineering designers to specify their products better during the design and specification stages (on their engineering drawings and/or CAD models) It provides improved design and specification requirements for important workpiece functional cases It adds to the ISO GPS toolbox of requirements (enhancing the full suite of ISO/TC 213 standards) It ensures the international acceptance of drawings and CAD models, helping users enter new markets and trade more easily Its incorporates the latest thinking, increasing confidence and trust in drawings and CAD models It will help users of BS 308, which is now withdrawn, to transition to current international practice

BS EN ISO 2692:2021 contributes to UN Sustainable Development Goal 9 on building resilient infrastructure, promoting inclusive and sustainable industrialization and fostering innovation.

What’s new about BS EN ISO 2692:2021?

This is a technical revision which replaces BS EN ISO 2692:2014. The main changes compared to the previous edition are:

Direct indication of maximum material or least material virtual size has been added The use of SZ or CZ symbols has been added The use of SIM symbol has been added