ISO 5459:2011
Geometrical product specifications (GPS) — Geometrical tolerancing — Datums and datum systems
ISO 5459:2011 specifies terminology, rules and methodology for the indication and understanding of datums and datum systems in technical product documentation. It also provides explanations to assist the user in understanding the concepts involved.
ISO 5459:2011 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 ISO 5459:2011.
The detailed rules for maximum and least material requirements for datums are given in ISO 2692.
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Scope
Normative references
Terms and definitions
Symbols
Role of datums
General concepts
General
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
Datum systems established in a defined sequence from two or
Single datums, common datums and datum systems
General
Single datums
Common datums
Datum systems
Graphical language
General
Indication of datum features
Datum feature indicator
Datum feature identifier
Datum targets
General
Datum target frame
Datum target symbol
Leader line
Specification of datums and datum systems
Indication and meaning of rules
General
Rules
Rule 1 — Datum features (established from a single feature)
Rule 2 — Associated features of size with fixed or variable
Rule 3 — Datum features established from a complete feature
Rule 4 — Datum features established from one or more datum t
Rule 5 — Associated feature with a different type than the n
Rule 6 — Tolerance frame layout with a datum or a datum syst
Rule 7 — Indication of a single or common datum in a compart
Rule 8 — Locked or released degrees of freedom from a datum
Rule 9 — Special indications for common datum
Rule 10 — Application of geometrical modifiers in a toleranc
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AS/NZS 1100.501:2002
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BS 1916-1:2009
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BS 1916-2:2009
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BS 1916-3:2009
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Scope
Normative references
Terms and definitions
Symbols
Role of datums
General concepts
General
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
Datum systems established in a defined sequence from two or
Single datums, common datums and datum systems
General
Single datums
Common datums
Datum systems
Graphical language
General
Indication of datum features
Datum feature indicator
Datum feature identifier
Datum targets
General
Datum target frame
Datum target symbol
Leader line
Specification of datums and datum systems
Indication and meaning of rules
General
Rules
Rule 1 — Datum features (established from a single feature)
Rule 2 — Associated features of size with fixed or variable
Rule 3 — Datum features established from a complete feature
Rule 4 — Datum features established from one or more datum t
Rule 5 — Associated feature with a different type than the n
Rule 6 — Tolerance frame layout with a datum or a datum syst
Rule 7 — Indication of a single or common datum in a compart
Rule 8 — Locked or released degrees of freedom from a datum
Rule 9 — Special indications for common datum
Rule 10 — Application of geometrical modifiers in a toleranc