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ISO 2692:2021

Geometrical product specifications (GPS) — Geometrical tolerancing — Maximum material requirement (MMR), least material requirement (LMR) and reciprocity requirement (RPR) ISO 2692:2021

Publication date:   Jun 10, 2021

General information

90.60   Close of review   Sep 3, 2026

ISO

ISO/TC 213 Dimensional and geometrical product specifications and verification

International Standard

01.100.20   Mechanical engineering drawings

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Scope

This document 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.

Life cycle

PREVIOUSLY

WITHDRAWN
ISO 2692:2014

NOW

PUBLISHED
ISO 2692:2021
90.60 Close of review
Sep 3, 2026




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