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Reduction bushing 1/2 to 3/8 describes exactly what this Amana Tool RB-122 part does: it adapts a 1/2 inch router collet to hold router bits with a 3/8 inch shank, so those tools can be used in a 1/2 inch collet setup. This part is an industrial high precision machined collet reduction sleeve, which means the inner and outer diameters are accurately sized to support the bit shank and collet grip during cutting. The sleeve is produced with high quality steel, so the bore and outside surface stay stable under CNC or handheld router loads. The precise machining limits the chance of run-out, helping the bit cut closer to true to reduce unwanted side loading. As a reduction sleeve, it simply provides a temporary way to run smaller shank router bits in equipment that is currently fitted with a 1/2 inch collet.
This 1/2 inch x 1-3/16 inch high precision steel router collet reducer with a 3/8 inch shank interface is designed to sit inside a 1/2 inch collet while holding a 3/8 inch shank router or CNC bit. The outer surface is sized for a 1/2 inch collet, so the collet jaws clamp on the steel sleeve instead of directly on the bit shank. The inner bore is sized for a 3/8 inch shank, centering the bit relative to the collet axis. The high precision machined construction limits the chance of run-out, so the router bit rotates more closely around its center line. In use, the reduction sleeve provides a way to run 3/8 inch shank tooling in a 1/2 inch collet system.
This industrial high precision machined collet reduction sleeve is built for CNC and router bits that have smaller shank sizes than the installed collet. In a 1/2 inch router collet, the RB-122 occupies the space between the collet jaws and a 3/8 inch shank, so the clamping force transfers through the high quality steel body of the sleeve. The 1/2 inch x 1-3/16 inch sizing defines the outside diameter and length of the reducer, which establishes how it seats inside the collet and supports the bit over its length. Because it is described as a router collet reducer with a 3/8 inch shank interface, the sleeve is directly matched to bits labeled with a 3/8 inch shank size, aligning the tool to the router spindle as the collet tightens.
The RB-122 reduction bushing is produced with high quality steel and is precisely machined to limit the chance of run-out, so the bit is held more concentrically during cutting. Reduced run-out means the cutting edges follow a more accurate circular path, which supports consistent cut width and helps reduce uneven loading on the tool. As an industrial high precision machined collet reduction sleeve, each surface that contacts the collet and the bit shank is designed to fit closely, promoting repeatable positioning each time the bit is clamped. The web description notes that reducing the router collet with a sleeve is not a long term solution, for best results using the correct size collet is strongly recommended, which frames this part as a practical way to use smaller shank bits when the installed collet size differs.
The RB-122 reduction bushing adapts a 1/2 inch router collet to hold CNC and router bits with a 3/8 inch shank, so 3/8 inch shank tooling can be used in a 1/2 inch collet.
The industrial high precision machined sleeve is precisely machined to limit the chance of run-out, helping router or CNC bits rotate more concentrically for more predictable cutting.
This part is described as a collet reduction sleeve that enables collet sizes to be reduced to accept CNC and router bits with smaller shank sizes, so one collet can hold different shank diameters.
The RB-122 is produced with high quality steel, which supports stable clamping surfaces between the router collet and the bit shank during use.
The web description notes that reducing the router collet with a sleeve is not a long term solution and states that for best results using the correct size collet is strongly recommended.
The product name describes it as a 1/2 inch x 1-3/16 inch high precision steel router collet reducer, indicating the outer collet diameter and overall length of the sleeve body.
The Amana Tool 1/2 inch x 1-3/16 inch high precision steel router collet reducer, 3/8 inch shank, provides a way to adapt a 1/2 inch collet to CNC and router bits with a 3/8 inch shank size. The industrial high precision machined construction and high quality steel are specified to limit the chance of run-out, supporting more accurate cutting paths. When a router or CNC setup is configured with a 1/2 inch collet and 3/8 inch shank bits are needed, this RB-122 collet reduction sleeve offers a practical way to match those sizes so work can proceed with the available tooling.