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BS EN ISO 2692:2021

BS EN ISO 2692:2021

$198.66

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 2021 64
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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
2 undefined
4 European foreword
Endorsement notice
6 Foreword
7 Introduction
9 1 Scope
2 Normative references
3 Terms and definitions
13 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
14 4.1.3 Direct indication of MMVS or LMVS
15 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
16 4.2.2 MMR for related datum features with indirect determination of virtual size
18 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
19 4.3 Least material requirement (LMR)
4.3.1 LMR for toleranced features with indirect determination of virtual size
20 4.3.2 LMR for related datum features with indirect determination of virtual size
21 4.3.3 LMR for toleranced features with direct indication of virtual size
22 4.3.4 LMR for related datum features with direct indication of virtual size
23 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)
24 Annex A (informative) Examples of tolerancing with ,  and 
56 Annex B (informative) Former practice
57 Annex C (informative) Concept diagram
59 Annex D (informative) Use of symbols for geometrical characteristics with  or 
61 Annex E (informative) Relation to the GPS matrix model
62 Bibliography

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BS EN ISO 2692:2021
$198.66