This interlocking joint uses multiple straight, narrow extensions that slide into matching slots on the adjoining piece. It vastly increases the glue surface area compared to a simple butt joint. It is frequently used in commercial milling to join short boards end-to-end to create long lengths of molding or construction lumber.
Heard on the job
We can use finger joint pine for the painted trim since the seams will be covered anyway.
Also heard as
- comb joint
- box joint
Do not mix it up with
- Dovetail: A finger joint uses straight, rectangular pins, while a dovetail uses flared, wedge-shaped pins that lock mechanically.
Related terms
Butt joint
A simple connection where the ends or edges of two workpieces meet squarely without interlocking parts.
Dovetail
A flaring, wedge-shaped interlocking joint that resists being pulled apart.
Mortise-and-tenon joint
A traditional wood joint connecting two pieces at a right angle by inserting a peg into a hole.