ISO 2692:2021
Geometrical product specifications (GPS) — Geometrical tolerancing — Maximum material requirement (MMR), least material requirement (LMR) and reciprocity requirement (RPR)
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.
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Maximum material requirement (MMR) and least material requirement (LMR)
4.1 General
4.1.1 MMVS or LMVS specification
4.1.2 Indirect determination of MMVS or LMVS
4.1.3 Direct indication of MMVS or LMVS
4.1.4 MMR or LMR applied to several toleranced features
4.1.5 Simultaneous requirement
4.1.6 MMR or LMR on a datum without MMR or LMR on the toleranced feature
4.2 Maximum material requirement (MMR)
4.2.1 MMR for toleranced features with indirect determination of virtual size
4.2.2 MMR for related datum features with indirect determination of virtual size
4.2.3 MMR for toleranced features with direct indication of virtual size
4.2.4 MMR for related datum features with direct indication of virtual size
4.3 Least material requirement (LMR)
4.3.1 LMR for toleranced features with indirect determination of virtual size
4.3.2 LMR for related datum features with indirect determination of virtual size
4.3.3 LMR for toleranced features with direct indication of virtual size
4.3.4 LMR for related datum features with direct indication of virtual size
5 Reciprocity requirement (RPR)
5.1 General
5.2 Reciprocity requirement (RPR) and maximum material requirement (MMR)
5.3 Reciprocity requirement (RPR) and least material requirement (LMR)
Annex A (informative) Examples of tolerancing with ,  and 
Annex B (informative) Former practice
Annex C (informative) Concept diagram
Annex D (informative) Use of symbols for geometrical characteristics with  or 
Annex E (informative) Relation to the GPS matrix model
Bibliography
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Maximum material requirement (MMR) and least material requirement (LMR)
4.1 General
4.1.1 MMVS or LMVS specification
4.1.2 Indirect determination of MMVS or LMVS
4.1.3 Direct indication of MMVS or LMVS
4.1.4 MMR or LMR applied to several toleranced features
4.1.5 Simultaneous requirement
4.1.6 MMR or LMR on a datum without MMR or LMR on the toleranced feature
4.2 Maximum material requirement (MMR)
4.2.1 MMR for toleranced features with indirect determination of virtual size
4.2.2 MMR for related datum features with indirect determination of virtual size
4.2.3 MMR for toleranced features with direct indication of virtual size
4.2.4 MMR for related datum features with direct indication of virtual size
4.3 Least material requirement (LMR)
4.3.1 LMR for toleranced features with indirect determination of virtual size
4.3.2 LMR for related datum features with indirect determination of virtual size
4.3.3 LMR for toleranced features with direct indication of virtual size
4.3.4 LMR for related datum features with direct indication of virtual size
5 Reciprocity requirement (RPR)
5.1 General
5.2 Reciprocity requirement (RPR) and maximum material requirement (MMR)
5.3 Reciprocity requirement (RPR) and least material requirement (LMR)
Annex A (informative) Examples of tolerancing with ,  and 
Annex B (informative) Former practice
Annex C (informative) Concept diagram
Annex D (informative) Use of symbols for geometrical characteristics with  or 
Annex E (informative) Relation to the GPS matrix model
Bibliography