TS 5220

TS 5220 is the standard for T-squares used in technical drawing and design work. It covers T-squares made from plastic, timber, and timber-plastic materials, typically used in schools, engineering services, and drafting or project work; metal T-squares are excluded from its scope.

The T-square in drafting practice

In general technical use, a T-square is a basic drafting aid for drawing horizontal lines and for supporting precise layout work on a drawing board, often together with set squares. It helps maintain alignment and repeatability in manual drafting, where a stable straight edge is needed for construction lines, outlines, and geometric positioning.

Material categories covered by the standard

• Plastic T-squares
• Timber T-squares
• Timber-plastic composite T-squares
• Models intended for school, engineering, and technical drawing use
• Metal T-squares excluded from the scope

Because the document focuses on a specific drafting tool, its practical value lies in distinguishing product families that perform the same function through different body materials. Material choice affects handling, weight, wear behaviour, and day-to-day drafting comfort. In that sense, the standard places the T-square as a distinct item within drawing equipment rather than as a generic ruler type.