Marking Gauge
A tool with a pin that scribes parallel layout lines along the edge of wood.
What is it?
The marking gauge has a beam and a stock with a hardened pin that scribes a line parallel to the edge. It lays out joinery, mortises, and reveals with repeatable accuracy.
What is it used for?
- Laying out joinery and mortises
- Scribing parallel lines
- Dovetail and tenon layout
How to choose
Choose a beam length to the work and a sharp pin or wheel cutter. Two-spur wheels scribe into the grain with less tear-out.
Anatomy
Understanding the parts of a marking gauge helps you use, maintain, and buy it with confidence.
- Body: the main working portion of the tool
- Working end: the part that contacts the material
- Handle: the part you grip for control and leverage
Materials & construction
Quality marking gauges are made from hardened, heat-treated steel (often chrome-vanadium or high-carbon) chosen for strength, edge retention, and resistance to wear and corrosion.
Safety & maintenance
- Inspect the tool before use and replace any that are worn or damaged
- Use the right tool for the job and apply controlled force
- Store tools clean and dry to prevent corrosion
- Wear appropriate eye protection for the work
Also known as
mortise gauge, scratch gauge