ISO 2692:2021 PDF

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

Open preview (PDF)

Title (English):

ISO 2692:2021

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

Document status:: Active
Format:: Electronic (PDF)
Number of pages:: 54
Publication date:: June 10, 2021
Edition:: ISO IS 2692 edition 4 version 1
ICS:: 01.100.20

Delivery type:

Full version25 €Read online 24h10 €Read online 72h15 €

Document language:

enru

Delivery time:Immediate download

Price:25 €

Description (English):

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.

Technical details

Technical committee: ISO/TC 213 - Dimensional and geometrical product specifications and verification
SKU: ISO 2692:2021

Abstract

Overview

ISO 2692:2021 is an ISO standard in the Geometrical Product Specifications (GPS) family that defines the Maximum Material Requirement (MMR), Least Material Requirement (LMR) and the optional Reciprocity Requirement (RPR) for geometrical tolerancing. This fourth edition clarifies how MMR and LMR apply to linear features of size - specifically cylindrical features and two parallel opposite planes - and provides rules for direct and indirect determination of virtual sizes (MMVS / LMVS). ISO 2692:2021 is part of the GPS system that links dimensional size and geometric deviation to functional performance.

Key topics and requirements

Scope limitation: MMR, LMR and RPR apply only to features of linear size of cylindrical type or two parallel opposite planes type.
MMR and LMR concepts: Combine size and geometry control to manage functions such as assemblability (MMR) or minimum wall thickness / material strength (LMR).
Virtual condition definitions: Specifies maximum material virtual size (MMVS) and least material virtual size (LMVS) and how to determine them indirectly (from feature size + geometric tolerance) or directly (explicit indication).
Reciprocity Requirement (RPR): Optional modifier that can enlarge permissible size tolerance when the actual geometrical deviation does not fully consume the MMVC/LMVC - useful where functional clearance or material minimums permit greater size variation.
Datum and multiple-feature rules: Guidance on applying MMR/LMR to datum features, several toleranced features, and simultaneous requirements (SIM).
Symbols and practice updates: This edition adds direct virtual-size indication, permits SZ/CZ usage for certain cases, and formalizes the SIM modifier for simultaneous tolerance application.

Applications and users

ISO 2692:2021 is practical for design, manufacturing and inspection workflows where size and geometry interact:

Design engineers: specify MMR/LMR to ensure part assemblability, minimum wall thickness or other function-driven limits.
Tolerance analysts / GD&T practitioners: combine dimensional and geometric tolerances using MMVS/LMVS and RPR for accurate stack-up analysis.
Manufacturing & quality control: interpret drawings with MMR/LMR to set inspection criteria and acceptance tests.
CAD/CAM and metrology teams: implement virtual condition checks and measurement strategies for cylindrical features and paired parallel planes. Keywords: ISO 2692:2021, geometrical product specifications, GPS, geometrical tolerancing, MMR, LMR, RPR, virtual condition, assemblability, minimum wall thickness.

Related standards

ISO 2692:2021 links into the GPS framework and references:

ISO 1101 (geometrical tolerancing - form, orientation, location, run-out)
ISO 5458, ISO 5459 (patterns, datums)
ISO 14405-1 (dimensional tolerancing - linear sizes)
ISO 17450-1 / ISO 17450-3 (GPS general concepts and toleranced features)

Use ISO 2692:2021 when you need a standardized method to control combined size-and-geometry functions (assembly fit, strength, or clearance) for cylindrical and parallel-plane features.

Related standards

Standards mentioned in the description

Abstract

Overview

Key topics and requirements

Scope limitation: MMR, LMR and RPR apply only to features of linear size of cylindrical type or two parallel opposite planes type.
MMR and LMR concepts: Combine size and geometry control to manage functions such as assemblability (MMR) or minimum wall thickness / material strength (LMR).
Virtual condition definitions: Specifies maximum material virtual size (MMVS) and least material virtual size (LMVS) and how to determine them indirectly (from feature size + geometric tolerance) or directly (explicit indication).
Reciprocity Requirement (RPR): Optional modifier that can enlarge permissible size tolerance when the actual geometrical deviation does not fully consume the MMVC/LMVC - useful where functional clearance or material minimums permit greater size variation.
Datum and multiple-feature rules: Guidance on applying MMR/LMR to datum features, several toleranced features, and simultaneous requirements (SIM).
Symbols and practice updates: This edition adds direct virtual-size indication, permits SZ/CZ usage for certain cases, and formalizes the SIM modifier for simultaneous tolerance application.

Applications and users

ISO 2692:2021 is practical for design, manufacturing and inspection workflows where size and geometry interact:

Design engineers: specify MMR/LMR to ensure part assemblability, minimum wall thickness or other function-driven limits.
Tolerance analysts / GD&T practitioners: combine dimensional and geometric tolerances using MMVS/LMVS and RPR for accurate stack-up analysis.
Manufacturing & quality control: interpret drawings with MMR/LMR to set inspection criteria and acceptance tests.
CAD/CAM and metrology teams: implement virtual condition checks and measurement strategies for cylindrical features and paired parallel planes. Keywords: ISO 2692:2021, geometrical product specifications, GPS, geometrical tolerancing, MMR, LMR, RPR, virtual condition, assemblability, minimum wall thickness.

Related standards

ISO 2692:2021 links into the GPS framework and references:

ISO 1101 (geometrical tolerancing - form, orientation, location, run-out)
ISO 5458, ISO 5459 (patterns, datums)
ISO 14405-1 (dimensional tolerancing - linear sizes)
ISO 17450-1 / ISO 17450-3 (GPS general concepts and toleranced features)

Use ISO 2692:2021 when you need a standardized method to control combined size-and-geometry functions (assembly fit, strength, or clearance) for cylindrical and parallel-plane features.

ISO 2692:2021 PDF

Technical details

Abstract

Overview

Key topics and requirements

Applications and users

Related standards

Related standards

Abstract

Overview

Key topics and requirements

Applications and users

Related standards

Related standards

Geometrical product specifications (GPS) - Geometrical tolerancing - Tolerances of form, orientation, locatio…

Geometrical product specifications (GPS) - Geometrical tolerancing - Pattern and combined geometrical specifi…

Geometrical product specifications (GPS) - Geometrical tolerancing - Datums and datum systems (ISO 5459:2024)

Geometrical product specifications (GPS) - Dimensional tolerancing - Part 1: Linear sizes (ISO 14405-1:2025)

Geometrical product specifications (GPS) - General concepts - Part 1: Model for geometrical specification and…

Geometrical product specifications (GPS) - General concepts - Part 3: Toleranced features (ISO 17450-3:2016)