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CNC extension adapter router bit describes this Amana Tool 47640 component, which is a 1/2 inch shank CNC extension adapter designed for 1/4 inch shank router bits, so it allows a 1/4 inch tool to be driven from a 1/2 inch collet. The adapter has a 1/4 inch internal diameter, so it grips 1/4 inch shank router bits for use in CNC or router setups that accept a 1/2 inch shank drive, which supports using common small-bit profiles with larger spindle configurations. The extension length is 3-7/16 inches, so it positions the cutting tool farther from the collet, which helps reach deeper operations where a standard bit length is not sufficient. The body diameter of 3/4 inch provides a solid extension profile, which helps support the tool during cutting operations.
The 1/2 inch shank on this Amana Tool 47640 CNC extension adapter fits tool holders or collets sized for 1/2 inch shanks, so it functions as the driven side of the setup. The opposite end provides a 1/4 inch internal diameter bore for a 1/4 inch shank router bit, so the bit is secured inside the adapter rather than directly in the spindle. The 3-7/16 inch extension length defines how far the bit can be positioned away from the collet face, which matters when setting up cuts where fixtures, clamps, or workpiece geometry require additional reach beyond standard bit lengths.
The Amana Tool 47640 extension adapter is identified as a router bit component in the router bits product class, which places it within the typical tooling group used on routers and CNC machines for woodworking and similar routing tasks. Its listing in the replacement parts category shows that it functions as a discrete tooling component that can be selected when an extension adapter is needed for 1/4 inch shank router bits. With a 1/2 inch shank and 1/4 inch internal diameter, this extension fits workflows where the main spindle uses 1/2 inch shank tooling while the cutting profiles are available on 1/4 inch shank bits, so it links these two interface sizes in one setup. The 3/4 inch diameter body and 3-7/16 inch length place the cutting bit forward relative to the collet, which can help when working over jigs, high fences, or tall workpieces that stand between the spindle nose and the cut location. The Total Indicated Run-out value of 0.00118 inch, or 0.03 mm, characterizes how much the extended bit can deviate from true rotation, which matters in jobs where cut location and surface finish are influenced by tool concentricity under rotation.
The 1/2 inch shank dimension on this CNC extension adapter standardizes how it seats in a 1/2 inch tool holder, which supports repeatable mounting because the shank matches common 1/2 inch router and CNC interfaces. The 1/4 inch internal diameter complements 1/4 inch shank router bits, so once the bit is secured in the bore, the extension effectively creates a longer, 1/2 inch driven shank for that bit, which helps keep tool selection flexible without changing the spindle collet size. The 3-7/16 inch extension length defines the distance from the drive shank to the bit clamping area, so once this distance is known, operators can plan stick-out from the collet and reference it during repeated setups for similar jobs. The 3/4 inch body diameter gives the extension a substantial cross section relative to its length, which supports the bit over the extended reach and helps maintain a consistent tool path as the bit moves through the material. The specified Total Indicated Run-out of 0.00118 inch, or 0.03 mm, quantifies the extension's run-out level at the bit, so this numerical value can be considered when planning operations that depend on consistent edge location, such as fine profiling or detail routing.
The Amana Tool 47640 CNC extension adapter uses a 1/2 inch shank, which lets it be driven by routers or CNC spindles that accept 1/2 inch shank tooling.
This CNC extension adapter has a 1/4 inch internal diameter, so it is designed to hold 1/4 inch shank router bits as the cutting tool.
The Amana Tool 47640 CNC extension adapter has an extension length of 3-7/16 inches, which positions the router bit farther from the collet for extended reach operations.
The 0.00118 inch Total Indicated Run-out value indicates the measured run-out of the extension, which reflects how closely the rotating bit tracks to its center line.
The 3/4 inch body diameter gives the extension a substantial size, which supports the bit along its length and helps maintain a stable connection during cutting.
The 47640 extension adapter is identified as a router bit component in the router bits product class, used as a CNC extension adapter for 1/4 inch shank router bits.
This Amana Tool 3/4 inch by 3-7/16 inch CNC extension adapter router bit matches setups that use a 1/2 inch shank drive and 1/4 inch shank router bits, so it links common bit sizes to 1/2 inch spindles. With a defined 3-7/16 inch extension length and 3/4 inch body diameter, it establishes a known geometry between the spindle and the bit, which supports repeatable positioning. The 0.00118 inch, or 0.03 mm, Total Indicated Run-out rating further characterizes how the extension holds a rotating bit, which matters when selecting tooling for work that values controlled run-out.