TS ISO 9960-1

TS ISO 9960-1 is a technical drawing standard concerned with the accuracy and essential characteristics of graduated or non-graduated draughting scale rules. These instruments belong to the core set of drawing equipment used to read, transfer, and lay out dimensions on technical drawings, and this standard focuses on their measurement reliability and basic functional features.

In general technical practice, a scale rule helps connect the dimensions on a drawing with the real-world size they represent. Graduated rules provide marked divisions for direct reading of lengths, while non-graduated rules offer a plain straightedge for transfer and layout work. The subject of this standard is the scale-rule arrangement and accuracy associated with SI units, so that reading and transferring dimensions can be done with greater consistency.

Why scale rules matter in technical drafting

Scale rules are widely used in architecture, mechanical drafting, and technical documentation where proportional representation is essential. SI-based graduation provides a metric reference that supports consistent work across drawing scales. In broader technical context, the value of these rules lies not only in speed, but also in repeatable dimension handling and dependable interpretation of the drawing scale.

• Graduated rules: marked tools that support direct length reading
• Non-graduated rules: plain straightedges used for transfer and layout
• SI units: metric-based graduation and scaling reference
• Accuracy: reliable spacing and marking for technical use

This standard addresses the accuracy and essential properties of scale rules, not every aspect of drafting instrument design. For users, the main technical interest is whether the rule is suitable for precise drawing work and whether its graduation system is consistent and dependable.