TS EN ISO 6433

TS EN ISO 6433 is a technical drawing standard for the presentation of part references in assembly representations. Its purpose is to make each constituent item shown in an assembly drawing easy to identify and consistently match with the corresponding entry in a related parts list. In technical product documentation, these references create the link between what is drawn and what is recorded in the product structure.

What part references do in practice

In general engineering use, part references are the visual identifiers that let readers understand how an assembly is made up. They are commonly shown with balloon callouts, leader lines or similar pointers, so the number on the drawing can be matched unambiguously to the correct line in the parts list. This improves drawing readability, reduces the risk of mixing up components, and supports communication between design, procurement, production and maintenance teams.

The standard’s specific focus

The standard gives rules for how part references are presented in assembly representations, meaning how individual parts are identified and related to the associated parts list. Its emphasis is on keeping the graphic representation and the parts information aligned. In technical product documentation, that consistency helps users inspect the assembly structure more easily and trace components more reliably.

• Presentation of part references on assembly drawings
• Matching drawing callouts to the related parts list
• Consistent identification within technical product documentation
• Better readability and traceability in assembly views