TS ISO 9175-1

TS ISO 9175-1 is the standard that deals with the dimensions, designation and marking of tubular tips for hand-held technical pens used with india ink on tracing paper. Its focus is not the pen body as a whole, but the geometry of the tip that governs line width and the consistency of the mark produced.

According to its scope, the standard covers tubular tip dimensions for pens used with or without lettering guides and templates, with the aim of achieving a constant line thickness within predetermined specifications. In general technical terms, the tip opening, ink delivery and the way the tip contacts the paper all influence the character of the line; standardising those dimensions helps different pens behave in a compatible and predictable way in technical drawing practice.

Definition, designation and marking

The wording in the title indicates that the document is also concerned with how these tips are defined and identified. “Designation” and “marking” are important in technical equipment because they provide a common language for specifying tip types and sizes in catalogues, drawings and procurement documents. That matters when similar products differ in details but must still be matched to the same drafting task.

As Part 1, this document forms the core reference for the subject area and is meant to work alongside related parts of the same standard family. For users of technical drawing instruments, its practical value lies in linking tip dimensions to a shared and repeatable notion of line thickness, rather than to a particular pen design or manufacturer.