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BS EN ISO 5459:2011

BS EN ISO 5459:2011

$215.11

Geometrical product specifications (GPS). Geometrical tolerancing. Datums and datum systems

Published By Publication Date Number of Pages
BSI 2011 92
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This International Standard specifies terminology, rules and methodology for the indication and understanding of datums and datum systems in technical product documentation. This International Standard also provides explanations to assist the user in understanding the concepts involved.

This International Standard defines the specification operator (see ISO 17450-2) used to establish a datum or datum system. The verification operator (see ISO 17450-2) can take different forms (physically or mathematically) and is not the subject of this International Standard.

NOTE The detailed rules for maximum and least material requirements for datums are given in ISO 2692.

PDF Catalog

PDF Pages PDF Title
9 Scope
Normative references
10 Terms and definitions
14 Symbols
15 Role of datums
17 General concepts
General
18 Intrinsic characteristics of surfaces associated with datum
General
A single datum established from a single feature
Common datum established from two or more single features si
20 Datum systems established in a defined sequence from two or
Single datums, common datums and datum systems
General
Single datums
22 Common datums
Datum systems
25 Graphical language
General
Indication of datum features
Datum feature indicator
26 Datum feature identifier
Datum targets
General
Datum target frame
27 Datum target symbol
Leader line
29 Specification of datums and datum systems
Indication and meaning of rules
General
30 Rules
Rule 1 ā€” Datum features (established from a single feature)
32 Rule 2 ā€” Associated features of size with fixed or variable
Rule 3 ā€” Datum features established from a complete feature
33 Rule 4 ā€” Datum features established from one or more datum t
37 Rule 5 ā€” Associated feature with a different type than the n
40 Rule 6 ā€” Tolerance frame layout with a datum or a datum syst
41 Rule 7 ā€” Indication of a single or common datum in a compart
42 Rule 8 ā€” Locked or released degrees of freedom from a datum
43 Rule 9 ā€” Special indications for common datum
Rule 10 ā€” Application of geometrical modifiers in a toleranc

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BS EN ISO 5459:2011
$215.11