TS ISO 9178-3

TS ISO 9178-3 is the standard that addresses slot widths in templates used for lettering and symbols, with a specific focus on templates intended for use with tubular-tip technical pens conforming to TS ISO 9175-1. In technical drawing, templates help guide the pen so letters, numerals, and symbols can be produced with consistent placement and form; slot geometry is therefore closely tied to the writing tool itself.

How the template and pen fit together

The key subject here is the width of the slots in the template. Slot width is the dimensional feature that allows the pen to move in a controlled way while limiting unnecessary play between the tool and the template. Tubular-tip technical pens are controlled drawing instruments used to produce lines and characters in drafting work, and the template acts as a guide that supports neat, repeatable marking. In general technical terms, this is about the geometric compatibility between the template and the writing instrument in technical drawing practice.

Context within technical drawing equipment

The standard belongs to the broader family of technical drawing equipment standards and is concerned with the visual consistency of lettering, symbols, and related drafting presentation. Templates are used in educational, office, and engineering drawing settings to obtain repeatable character forms, and defined slot dimensions help align different pen types with the intended use. This listing refers to a 1999 edition based on ISO 9178-3:1989 and is marked as withdrawn.

• Slot widths define the physical fit between the template and the tubular-tip technical pen.
• The application area is lettering and symbol formation in technical drawing.
• Compatibility is linked to technical drawing pens conforming to TS ISO 9175-1.
• The document is part of the templates for lettering and symbols series.
• The record is marked as a withdrawn standard.