Finger-Joint

Finger-Joint

Definition

A Finger-Joint is a wood joinery technique used to extend the length of wood pieces. The ends of two shorter pieces are cut into interlocking zig-zag shapes (resembling fingers) using a router or specialized cutter, then glued together to create a longer, structurally stable piece. This method maximizes surface area for glue adhesion and provides a strong, durable joint.

Applications

• Extending frame moulding to achieve custom lengths without visible seams.
• Manufacturing furniture components and cabinet rails.
• Creating longer wooden panels for architectural or decorative purposes.

Advantages

• Provides a strong, long-lasting bond due to increased glue surface area.
• Reduces waste by allowing shorter offcuts to be joined into usable lengths.
• Minimizes visible end joints in finished wood surfaces when properly executed.

Best Practices

• Ensure precise cutting of finger shapes to allow snug interlocking.
• Use high-quality wood glue and apply even pressure during clamping.
• Sand and finish the joint to match surrounding surfaces for seamless appearance.
• Consider humidity and wood expansion to prevent joint gaps over time.

Related Terms

• Miter Joint
• Chop
• Lap Joint
• Mortise And Tenon