ISO 5459-2024 PDF

Full title and description

St ISO 5459-2024 — Geometrical product specifications (GPS) — Geometrical tolerancing — Datums and datum systems. This International Standard specifies terminology, rules and methodology for the indication and interpretation of datums and datum systems used in technical product documentation and provides explanatory guidance to assist users in applying these concepts correctly.

Abstract

ISO 5459:2024 defines how datums and datum systems are specified on engineering drawings and in product documentation, describes the specification operator used to establish datums, explains associated datum features and datum feature simulators, and clarifies default contact conditions. The standard does not prescribe specific verification procedures (verification operators are outside its scope) and refers to related standards for rules on material condition (for example ISO 2692).

General information

• Status: Published
• Publication date: 4 October 2024
• Publisher: International Organization for Standardization (ISO)
• ICS / categories: 01.100.20 (Mechanical engineering drawings); 17.040.10 (Limits and fits); 17.040.40 (Geometrical Product Specification (GPS))
• Edition / version: Edition 3 (ISO 5459:2024)
• Number of pages: 115

Scope

This standard establishes the terminology, graphical notation, rules and methodology for specifying datums and datum systems on technical product documentation. It covers: definition of datum features and associated datum features; use of datum feature simulators; rules for specifying datum precedence and datum targets; the specification operator for establishing datums; and explanatory material to aid consistent interpretation. Verification methods and measurement procedures are not defined in detail by this document; those are addressed in complementary standards.

Key topics and requirements

• Definitions and terminology for datum-related concepts (datum feature, associated datum feature, datum target, datum feature simulator).
• Graphical notation and rules for indicating datums and datum systems on drawings and 3D product definition data.
• Specification operator (how a datum or datum system is established in specification language) and its correct application.
• Rules for datum precedence, ordering and multi-datum systems.
• Guidance on default contact conditions and common datum-simulation practices.
• Cross-references to related GPS standards for verification, maximum/minimum material conditions, and measurement methods (e.g., ISO 17450-2 and ISO 2692).

Typical use and users

Used by mechanical designers, CAD engineers, metrologists, quality engineers, draughtspersons and technical documentation authors to unambiguously specify reference frames for dimensional and geometrical tolerancing. It is applied in product design, engineering drawings, inspection planning, coordinate-measuring procedures, manufacturing tolerancing and contract specifications where consistent interpretation of datums is required.

Related standards

ISO 1101 (geometrical tolerancing of form, orientation, location and run-out), ISO 17450-2 (specification and verification operators — vocabulary and concepts), ISO 2692 (rules for maximum and least material conditions), ISO 5458 (pattern and combined geometrical specification), ISO 1660 (profile tolerancing) and other GPS-series standards maintained by ISO/TC 213.

Keywords

datums, datum systems, datum feature, datum feature simulator, specification operator, geometrical product specification (GPS), geometrical tolerancing, associated datum feature, datum targets, ISO 5459:2024

FAQ

Q: What is this standard?

A: ISO 5459:2024 is an international standard that defines terminology, notation and rules for specifying datums and datum systems used in geometrical product specification and tolerancing.

Q: What does it cover?

A: It covers the definition and graphical indication of datums and datum systems, the specification operator for establishing datums, rules for datum precedence and use of datum feature simulators, plus explanatory guidance for consistent interpretation. It does not define detailed measurement/verification procedures.

Q: Who typically uses it?

A: Mechanical designers, CAD and drawing authors, metrology and quality engineers, inspection planners and manufacturers use it to ensure consistent datum specification and interpretation across design and inspection activities.

Q: Is it current or superseded?

A: ISO 5459:2024 is the current edition (third edition) published on 4 October 2024. It supersedes ISO 5459:2011.

Q: Is it part of a series?

A: Yes. It is part of the ISO GPS (Geometrical Product Specification and Verification) family of standards maintained by ISO/TC 213 and is closely related to standards such as ISO 1101, ISO 17450-2 and ISO 2692.

Q: What are the key keywords?

A: Datums, datum systems, datum feature, datum feature simulator, specification operator, geometrical tolerancing, GPS.