ISO 129-5-2018 PDF

Full title and description

Technical product documentation — Indication of dimensions and tolerances — Part 5: Dimensioning of structural metal work. This ISO part gives rules and conventions for indicating dimensions and tolerances specifically applicable to structural metalwork such as plates, bars and profile sections used in fabrication and construction.

Abstract

ISO 129-5:2018 specifies conventions for the dimensioning of technical drawings used for structural metal work. It defines how to present dimensions, applicable symbols for common structural sections, and special indications to ensure clear transfer of information from design drawings to fabrication and assembly.

General information

• Status: Published (confirmed current following ISO review).
• Publication date: April 2018 (2018-04).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 01.100.01 (Technical drawings in general).
• Edition / version: Edition 1 (2018).
• Number of pages: 17 pages.

Core bibliographic and status information above is taken from the ISO bibliographic entry for ISO 129-5:2018.

Scope

Provides requirements and recommendations for the dimensioning of drawings intended for general use on structural metal work, primarily covering plates, bars and profile sections. The standard focuses on presentation conventions that reduce ambiguity in fabrication and inspection of structural components.

Key topics and requirements

• Rules for placement and grouping of dimensions on structural-detail drawings (overall, local and reference dimensions).
• Conventions for dimension lines, extension lines and leaders appropriate to structural parts.
• Use of standardized symbols and section-type indicators for common structural profiles (for example I/H/Channel/T/flat sections) to simplify cross-section specification.
• Guidance on indicating lengths, cut/bend dimensions and repetitive features to support fabrication efficiency.
• Recommendations for indicating tolerances and special indications relevant to structural metalwork to avoid ambiguity between design intent and manufacture.

These topics reflect the standard's orientation toward clear, unambiguous dimensioning for fabrication and assembly of structural metal components.

Typical use and users

Used by structural engineers, steel detailers, fabricators, draughting/CAD teams, construction document authors and quality/inspection personnel to produce and interpret shop and fabrication drawings for structural metalwork. The standard is applied where consistent presentation of dimensions and tolerances reduces rework and misinterpretation during manufacturing and assembly.

Related standards

ISO 129-5 is part of the ISO 129 series (Presentation of dimensions and tolerances). Related parts include ISO 129-1 (General principles) and ISO 129-4 (Dimensioning of shipbuilding drawings); related technical product documentation standards such as ISO 3098 (lettering) and profile-shape standards (e.g., ISO 5261) are often used alongside ISO 129-5.

Keywords

dimensioning, tolerances, structural metal work, fabrication drawings, profiles, plates, bars, section symbols, technical product documentation, ISO 129

FAQ

Q: What is this standard?

A: ISO 129-5:2018 is an ISO international standard that specifies conventions for the dimensioning of drawings for structural metal work (plates, bars and profile sections).

Q: What does it cover?

A: It covers how to present and place dimensions and tolerance indications on drawings for structural metal components, including recommended symbols and conventions for common structural profiles to ensure clarity for fabrication and inspection.

Q: Who typically uses it?

A: Structural engineers, detailers, fabricators, CAD/draughting teams and inspection personnel use ISO 129-5 when preparing or interpreting fabrication and shop drawings for structural metalwork.

Q: Is it current or superseded?

A: ISO 129-5:2018 is the published Edition 1 from April 2018; ISO's record indicates this version was reviewed and confirmed as current (review confirmed in 2024).

Q: Is it part of a series?

A: Yes — it is Part 5 of the ISO 129 series (Presentation of dimensions and tolerances), which also includes Part 1 (general principles) and other parts addressing specific application areas such as shipbuilding.

Q: What are the key keywords?

A: Dimensioning, tolerancing, structural metal work, fabrication drawings, section symbols, technical product documentation (ISO 129).