Equilateral Triangular · 5 mm on A3 · Portrait

About this template

An equilateral triangular grid built from three families of parallel lines crossing at 60°. Distinct from isometric in that no axis is preferred - every direction is equivalent. Excellent for structural truss studies, tile-pattern design, hex-tile games and crystallographic illustration. See also: A short reading list on technical drawing standards can help you put any of these grids in their historical and standards-based context.

Best used for

• Truss and space-frame layouts
• Hexagonal tile pattern design
• Geodesic dome studies
• Tabletop hex-grid game maps

Why A3 in portrait

Doubles the area of A4 along the long edge - the workhorse for plan drawings, schematics and concept sketches in metric studios. The portrait orientation gives you 297 mm of horizontal run and 420 mm of vertical, which suits tall subjects - elevations, sections, single-column drawings - where the eye reads top-to-bottom. Trim and bleed allowances on consumer printers will normally remove a 5 mm strip from each edge; this grid is generated to remain measurable even after that trim, with no critical content placed inside the printer-margin band.

Standards and lineage

Triangular meshes underpin the structural geometry described in Eurocode 3 for triangulated steel trusses. The A3 sheet itself follows ISO 216, and the title-block conventions assumed by this template come from ISO 5457:1999 - the international standard governing how technical drawings are framed, dated, and signed. Background reading: See our scale-and-projection guides for a deeper dive on how all the standards in this lineage interact in practice.

A short history of this grid

Buckminster Fuller championed the triangular and hexagonal grids during the development of his geodesic dome research in the 1940s and 50s.

Printing notes

For accurate output, print at 100 % scale - never "fit to page", which silently shrinks the sheet by 4–6 % and breaks every measured cell. Use a laser printer if the grid will be traced over with ink, since inkjet inks bleed through technical pen and pencil. If your printer cannot handle the full A3 sheet, scale the SVG to the next-smaller paper size before printing - every GridCraft grid is delivered as vector artwork so it scales cleanly. The downloaded SVG carries the physical sheet dimensions in millimetres, so a compliant print driver should print at 1:1 by default. Our how-to-print guide walks through the calibration test in 30 seconds.

Designer's note

Specialty grids reward the discipline of choosing the right sheet for the right drawing. A Equilateral Triangular · 5 mm on A3 is not a one-size-fits-all sheet - it's a calibrated tool for a specific class of problem. Use it where the page suits the drawing; reach for a different sheet when it doesn't. The catalogue is large precisely so you don't have to compromise on the projection, scale or sheet size.