ISO 128-2:2020
Technical product documentation (TPD) — General principles of representation — Part 2: Basic conventions for lines
This document establishes the types of lines used in technical drawings (e.g. diagrams, plans or maps), their designations and their configurations, as well as general rules for the draughting of lines. In addition, this document specifies general rules for the representation of leader and reference lines and their components as well as for the arrangement of instructions on or at leader lines in technical documents. Annexes have been provided for specific information on mechanical, construction and shipbuilding technical drawings.
For the purposes of this document the term "technical drawing" is interpreted in the broadest possible sense encompassing the total package of documentation specifying the product (workpiece, subassembly, assembly).
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Types of lines
4.1 General
4.2 Basic types
4.3 Line sub types
4.4 Variations of the basic types of lines
4.5 Combinations of lines with the same length
4.5.1 Arrangement of two or more lines parallel to each other
4.5.2 Arrangement of two different types of lines
4.5.3 Arrangement of two continuous lines parallel to each other with regularly recurring connecting elements between them
4.5.4 Arrangement of regularly recurring geometric pictorial elements in association with continuous lines
5 Line dimensions
5.1 Line width
5.2 Deviation in line width
5.3 Configuration of lines
6 Draughting of lines
6.1 Spacing
6.2 Junctions
6.2.1 Types
6.2.2 Representation
6.3 Location of a second line
6.4 Hierarchy of overlapping lines
7 Colours
8 Designation
9 Basic conventions and applications for leader lines and reference lines
9.1 Presentation of leader lines
9.2 Representation of reference lines
9.3 Indication of instructions
Annex A (informative) Preparation of lines by CAD systems
Annex B (normative) Lines on construction technical drawings
Annex C (informative) Examples of application on construction technical drawings
Annex D (normative) Types of lines and their application on mechanical engineering technical drawings
Annex E (informative) Examples of application on mechanical engineering technical drawings
Annex F (normative) Types of lines and their application on shipbuilding technical drawings
Annex G (informative) Application examples of the different types of lines on shipbuilding technical drawings
Bibliography
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Types of lines
4.1 General
4.2 Basic types
4.3 Line sub types
4.4 Variations of the basic types of lines
4.5 Combinations of lines with the same length
4.5.1 Arrangement of two or more lines parallel to each other
4.5.2 Arrangement of two different types of lines
4.5.3 Arrangement of two continuous lines parallel to each other with regularly recurring connecting elements between them
4.5.4 Arrangement of regularly recurring geometric pictorial elements in association with continuous lines
5 Line dimensions
5.1 Line width
5.2 Deviation in line width
5.3 Configuration of lines
6 Draughting of lines
6.1 Spacing
6.2 Junctions
6.2.1 Types
6.2.2 Representation
6.3 Location of a second line
6.4 Hierarchy of overlapping lines
7 Colours
8 Designation
9 Basic conventions and applications for leader lines and reference lines
9.1 Presentation of leader lines
9.2 Representation of reference lines
9.3 Indication of instructions
Annex A (informative) Preparation of lines by CAD systems
Annex B (normative) Lines on construction technical drawings
Annex C (informative) Examples of application on construction technical drawings
Annex D (normative) Types of lines and their application on mechanical engineering technical drawings
Annex E (informative) Examples of application on mechanical engineering technical drawings
Annex F (normative) Types of lines and their application on shipbuilding technical drawings
Annex G (informative) Application examples of the different types of lines on shipbuilding technical drawings
Bibliography