Trend Butterfly Spline Router Cutter

The Trend Butterfly Spline Router Cutter is a specialist routing bit designed to cut butterfly keys and splines in timbers and man-made boards — an essential tool for decorative joinery and structural crack repair work.

Used in a router table, this cutter works in conjunction with a 104° (14°) dovetail cutter (ref. L120), which first cuts the corresponding dovetail pocket. The two-cutter system allows precise, repeatable butterfly spline joints, with the width of the finished butterfly determined by the dovetail cutter used.

The cutting process requires two passes to produce the characteristic butterfly shape, making technique straightforward once set up correctly. With a 1/2" shank, 28mm diameter, and a generous 46mm cut length, this cutter is well suited to professional cabinetmakers, furniture makers, and experienced woodworkers tackling both aesthetic and structural joinery applications.

Features and Benefits:
• Designed specifically for butterfly key and spline routing in timber and man-made boards
• Compatible with Trend L120 104° dovetail cutter for matched dovetail pocket and spline profiles
• Two-pass cutting process creates precise butterfly shapes
• 1/2" shank for secure, stable mounting in a router table
• Suitable for both decorative and structural joinery applications

Specifications:
Shank Diameter: 1/2"
Diameter: 28mm
Cut Length: 46mm
Overall Length: 84mm
Angle: 104°