RSA12 Adjustable Rafter Square (imperial)


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Introducing our NEW RSA12 Adjustable Rafter Square. The largest imperial Rafter Square by TrigJig.

Developed for quick and simple marking/laying out of roof trusses with the smart adjusting fence that locks in position for speed, ease and repeatability.

With 6 marking gauges on the blade, the RSA12 Adjustable can be used in many carpentry and fabrication projects, though its speciality is for roofing and use with big timber.

The RSA12 is manufactured in-house from the highest quality European T6 4mm thick aluminium. We CNC machine each tool to tight tolerances, with right angle precision of +/- 0.008° along the entire length. 

The RSA12 has an anti-glare anodised surface to help with outdoor use on sunny days. The laser marked graduation rulers and parallel scribe scales are recessed in pockets to avoid wear over time.

The degree lines are deep engraved so they won't rub off, and as they are made on the same CNC milling machine that profiles the square, the level of precision is excellent. 

The adjustable silver anodised aluminium fence is also CNC machined and is fixed to the tool via nylon 66 bearings for smooth operation that snaps back to exactly 0°. The fence can be locked in place with a stainless steel thumb screw for repeatable cuts and marking super precise birds mouths, without any repeat measuring required.

There are several features and marking gauges on the face of the tool, including;

  • 12 inch rule (plus a smaller rule along the fence edge)
  • Fixed deep engraved protractor gauge along the hypotenuse edge
  • Rise and run protractor gauge (in degrees and fractions)
  • Scribe lines for common timber dimensions every 1/4"
  • 1/3rd scribe marks for common timber thicknesses
  • Parallel slots
  • Rise per foot of run table
  • Rafter length per foot of run table

The precision and workmanship from our manufacturing process is unrivalled and next level compared to mass produced, laser cut or cast rafter squares. The RSA12 Adjustable is built to an extremely high standard, designed for tradespeople who are looking for exceptional durability, design and quality from their tools. 

  • Constructed from high quality 4mm aluminium
  • High precision CNC machine profiled
  • Adjustable CNC machined aluminum fence
  • Anodised protective finish
  • CNC laser marked graduation scales

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