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BS EN ISO 2692:2021 – TC:2023 Edition

BS EN ISO 2692:2021 – TC:2023 Edition

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

Published By Publication Date Number of Pages
BSI 2023 152
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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.

PDF Catalog

PDF Pages PDF Title
1 30451199
89 A-30374421
90 undefined
92 European foreword
Endorsement notice
94 Foreword
95 Introduction
97 1 Scope
2 Normative references
3 Terms and definitions
101 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
102 4.1.3 Direct indication of MMVS or LMVS
103 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
104 4.2.2 MMR for related datum features with indirect determination of virtual size
106 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
107 4.3 Least material requirement (LMR)
4.3.1 LMR for toleranced features with indirect determination of virtual size
108 4.3.2 LMR for related datum features with indirect determination of virtual size
109 4.3.3 LMR for toleranced features with direct indication of virtual size
110 4.3.4 LMR for related datum features with direct indication of virtual size
111 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)
112 Annex A (informative) Examples of tolerancing with ,  and 
144 Annex B (informative) Former practice
145 Annex C (informative) Concept diagram
147 Annex D (informative) Use of symbols for geometrical characteristics with  or 
149 Annex E (informative) Relation to the GPS matrix model
150 Bibliography

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BS EN ISO 2692:2021 - TC
$258.95