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Butterfly spline dovetail router bit is a 1-1/8 inch x 3-1/4 inch bit from Amana Tool that cuts a butterfly spline dovetail profile, giving cabinet and woodworking joints a defined shape that follows the bit geometry for consistent results. The bit belongs to the router bits class, so it is designed to run in a router to shape stock for cabinet joinery and similar work where a controlled profile is required. A 1/2 inch shank connects the bit firmly to the router collet, which helps the cutting edges track accurately along guides or jigs. The two-flute cutting layout engages the wood with a pair of cutting edges, so each pass follows the same path set by the dovetail design. This bit is used for certain operations with the Incra dovetail jig, tying the profile directly to jig-guided layouts where matched geometry matters.
The 1/2 inch shank on this Amana Tool butterfly spline dovetail router bit is made to seat in a 1/2 inch router collet, so the mounting step centers on securing the shank straight in the router for accurate running. Because the bit is a router bit from the cabinet joinery category, it fits into workflows where jigs or fences guide the cut, and the router carries the 1-1/8 inch x 3-1/4 inch profile through the stock. The two-flute layout means the installer aligns the bit so both flutes clear the work path defined by the jig or guide, letting the dovetail form follow the geometry the bit was designed to cut.
This 1-1/8 inch x 3-1/4 inch butterfly spline dovetail router bit from Amana Tool is positioned in the cabinet joinery category, so it serves work where routed joints are part of the build sequence. The bit is used for certain operations with the Incra dovetail jig, which places it in workflows where the jig determines the layout and the bit supplies the matching dovetail profile. In these situations, the router carries the bit along the jig-guided path, and the bit geometry shapes the mating cuts so the butterfly spline dovetail form follows the Incra setup. Because the bit is defined by its butterfly spline dovetail profile, projects that call for that shape can rely on this specific cutter to match the jig steps that reference this part number.
The Amana Tool router bit 45860 uses a 1/2 inch shank, which provides a solid interface to the router collet so the butterfly spline dovetail profile runs true when the router is guided by a jig or fence. Its 2-flute construction means two cutting edges share the work, which helps the bit follow the same path on each pass as the Incra dovetail jig moves the router through its pattern. The 1-1/8 inch x 3-1/4 inch specification ties the actual cut dimensions to the bit itself, so when a setup is built around this part, the joints cut later follow the same size reference. Being part of the router bits class for cabinet joinery keeps the geometry aligned with typical joinery tasks where the bit shape and jig layout must match.
The butterfly spline dovetail router bit is listed in the cabinet joinery category, so it is intended for routed joinery tasks where a dovetail-style butterfly spline profile is part of the build.
The 1/2 inch shank fits routers with a 1/2 inch collet, which provides a solid mounting point so the bit can run true while following a jig or guide path.
The 1-1/8 inch x 3-1/4 inch size defines the butterfly spline dovetail geometry, so joints based on this bit share the same profile when matching parts are routed.
The 2-flute design provides two cutting edges that remove material along the dovetail path, supporting a balanced cut pattern during guided cabinet joinery operations.
This Amana Tool router bit is used for certain operations with the Incra dovetail jig, so it serves layouts where the jig pattern is matched to this butterfly spline profile.
Amana Tool part number 45860 identifies this specific butterfly spline dovetail router bit, letting setups and jig instructions reference an exact cutter.
The Amana Tool butterfly spline dovetail router bit 45860 combines a 1-1/8 inch x 3-1/4 inch profile, 2-flute layout, and 1/2 inch shank in a router bit built for cabinet joinery. When a project or Incra dovetail jig operation specifies this geometry, choosing this exact bit keeps the cut profile aligned with the intended layout so routed joints follow the same pattern from piece to piece.