Corner Chisels

Corner chisels (sash chisels) cut accurate 90 degree corners in mortises and housings.  Their L shaped blades clean out corners left by routers or drills.

What are corner chisels used for?
Corner chisels are specialized tools used to cut clean, square inside corners, typically in mortises, hinge recesses, and housing joints. They’re ideal for squaring up the round edges left behind by router bits or drill bits, especially in wood joinery and cabinetry.

How do corner chisels differ from standard chisels?
Corner chisels have an L-shaped cutting edge that simultaneously cuts both sides of a corner at a perfect 90° angle. Unlike flat or bevel chisels, they are struck vertically with a mallet to quickly and cleanly form or refine corners, reducing the need for manual clean-up with multiple tools.

How do I use and maintain a corner chisel properly?

• Place the chisel squarely in the corner of the routed or drilled recess

• Use a firm mallet strike to drive the blade cleanly into the wood

• Avoid twisting or levering the tool, which can damage the cutting edges

• Keep both cutting edges sharp using sharpening stones or a flat diamond file
  Regular maintenance ensures clean cuts, accurate corners, and a longer tool life, especially in detailed joinery work.