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Lock miter router bit from Amana Tool is a 2-11/16 inch x 45 degree lock miter bit with a 1/2 inch shank that creates interlocking miter joints, so cabinet joinery projects assemble with accurate, repeatable alignment. The bit is a 2-flute router bit, which means two cutting edges share the workload and help produce a smooth cut surface that needs less cleanup before assembly. The first workpiece is cut flat in a horizontal position, so one setup handles the base component of the joint on a router table or similar support. The second workpiece is cut perpendicular in a vertical position to the first, so the mating piece forms a matching profile that locks together during glue-up. The design is described as router bit, lock mitre, so the profile geometry is intended specifically for lock miter cabinet joinery rather than general profiling.
The web description states that there is no need to realign the router depth, provided that the wood is centered to the cutting edge of the bit, so once the depth is dialed in for the horizontal pass, the same depth setting works for the vertical pass when stock is positioned correctly. This behavior matters on cabinet joinery runs, because one height setup can process both mating parts and reduce time spent changing router depth between cuts. The note that performance depends on the wood being centered to the cutting edge highlights how the profile is engineered to cut equal geometry on both sides of the centerline, which supports accurate lock miter engagement when the horizontal and vertical pieces are brought together.
This router bit, lock mitre design is placed in the Cabinet Joinery category, so its geometry is oriented toward building cabinet components that need aligned, interlocking corners. The ability to cut the first piece flat (horizontal) lets wide cabinet sides or bottoms run against a table surface, supporting straight tracking as the lock miter profile is milled along the edge. The matching ability to cut the second piece perpendicular (vertical) to the first means narrow stiles or adjoining cabinet members can be run upright to form a complementary shape that keys into the horizontal member. The description notes that the joint produced by these two passes gives a perfect fit when the stock is centered to the cutting edge, so the installed cabinet corner seats tightly along the entire miter length instead of relying only on surface contact at the outside edge.
The manufacturer part number 55390 identifies this specific Amana Tool lock miter router bit, so once a setup performs well on a cabinet run it can be repeated later by using the same part. The 2-11/16 inch x 45 degree specification defines a consistent geometry, so both horizontal and vertical cuts match profile-to-profile and help control joint alignment along tall cabinet case edges. Because there is no need to realign the router depth when the wood is centered to the cutting edge, installers can process both parts of each joint using a single height reference, which supports consistent results from one cabinet to the next. The 2-flute layout spreads cutting action across two edges, which interacts with the centering requirement to maintain a balanced cut on both faces of the profile, and that balance supports smoother assembly as the lock miter joint slides together.
The 55390 lock miter router bit creates a lock mitre joint where one piece is cut flat and the mating piece is cut perpendicular, producing an interlocking miter profile for tight cabinet joinery.
The router bit cuts the first piece flat in a horizontal position and the second piece perpendicular in a vertical position, so the two parts form matching profiles that fit together precisely.
The 55390 lock miter router bit is described as needing the wood centered to the cutting edge so the profile geometry matches on both pieces, allowing the assembled joint to achieve a perfect fit.
The lock miter router bit is described as requiring no router depth realignment between passes when the wood is centered, so one depth setting serves both horizontal and vertical cuts.
The Amana Tool lock mitre router bit has a 1/2 inch shank, so it fits routers designed to hold 1/2 inch shank bits for cabinet joinery operations.
The 2-flute layout on this router bit means two cutting edges share the work, promoting smoother cutting surfaces on the lock miter profile that assist with tight-fitting cabinet joints.
The 2-11/16 inch x 45 degree lock miter bit from Amana Tool offers a router bit, lock mitre profile specifically described for cabinet joinery, so it suits projects where interlocking miter joints help align cabinet components. With its 1/2 inch shank, the bit is ready for routers that accept this common shank size, supporting stable mounting during edge forming. The ability to cut one piece horizontal and a second piece vertical, without changing router depth when the wood is centered to the cutting edge, lets shops run repeatable lock miter joints across cabinet parts with a consistent setup.