Graders Triangle Ruler, 40cm (Hard Plastic)

The Industrial-Scale Precision Ruler for Pattern Cutters and Graders

Maximize your drafting speed and guarantee absolute geometric accuracy with the Graders Triangle Ruler (40cm Hard Plastic Edition). Commonly referred to in commercial ateliers as a heavy-duty grader’s set square, this professional-grade instrument is a critical fixture on expansive cutting tables and technical design workbenches. Combining a multi-increment grading matrix, an integrated protractor, and a robust right-angle square into a single high-definition tool, it allows technical designers and bespoke tailors to plot full-scale garment blocks, establish balance lines, and grade complex patterns with flawless millimetric execution.

Advanced Multi-Axis Grid Layout for Professional Mapping

The large-format 40cm baseline profile provides the extended structural surface needed to span full bodice pieces, trouser rises, and long jacket blocks without losing alignment. Its precise layout allows you to mathematically calculate and draw:

• Flawless 90° Perpendiculars: Drop completely square lines down from center-fronts or grainlines to construct balanced hems, waistbands, and right-angled seam intersections.
• Integrated 180° Protractor: Easily measure and trace intricate dart angles, shoulder slopes, collar pitches, or lapel breaks directly using the built-in central semi-circle protractor.
• Dual-Interval Parallel Grading Lines: Instantly draft parallel seam lines and map industrial size grading increments via the internal multi-line matrix, featuring specialized 5mm spacing on one half and precise 2.5mm spacing on the other.
• Mathematical Bias Lines (45°): Rapidly align your fabric on a perfect true bias for draping cowl panels, cutting bias strips, or plotting diagonal style accents.

Rigid, Heavy-Duty Rigid Hard Plastic Construction

Forged from premium, heavy-weight rigid hard plastic, this 40cm triangle square is engineered to stay perfectly flat under high-pressure studio workloads. Unlike lighter, flexible rulers that can bow or flex during long pencil passes, this rigid board provides a rock-solid mechanical guide for mechanical pencils, pattern markers, or rotary blades. Its crystal-clear transparency keeps your underlying markings fully visible, while the high-contrast black grid lines are permanently embedded inside the hard plastic body—ensuring they remain sharp and completely rub-proof, even after thousands of layout runs across rough pattern paper.

Technical Specifications