Product Description
The CMT Reduction Bushing for Bearing - 5/16" to 3/16" is a precision-ground steel adapter designed to reduce bearing and collet bore sizes, giving woodworkers and machinists a reliable way to fit CMT router bits and tooling to the correct bearing dimensions. Built from solid steel and machined to tight tolerances, this small but essential component eliminates wobble and ensures accurate, repeatable tool positioning on routers and router tables.
Key Features
- Reduction bushing design steps down from a 5/16" (8mm) outer diameter to a 3/16" (4.76mm) bore - allows you to adapt bearings and collets to the correct bore size without replacing entire tooling assemblies
- Precision-ground steel construction - delivers a tight, wobble-free fit that maintains accurate bearing alignment and protects the quality of your cuts
- Steel material throughout - provides the durability and dimensional stability needed to hold precise tolerances under the rotational forces of router operation
Why This Product
- Solves the common problem of mismatched bearing and collet bore sizes - instead of sourcing an entirely new bearing or bit, this bushing bridges the gap between a 5/16" bearing and a 3/16" bore quickly and economically
- Precision-ground steel means you are not sacrificing accuracy for convenience - the fit is tight and true, which directly affects cut quality and tool longevity on routers and router tables
- Compact and purpose-built for CMT tooling systems - designed to work with CMT router bits and bearing accessories, so compatibility is built in rather than assumed
- Steel construction resists deformation under load - maintaining the 8mm outer diameter and 4.76mm bore relationship even through repeated installation and removal cycles
Specifications
- Manufacturer Part Number: 799.017.00
- Brand: CMT Orange Tools
- Product Type: Reduction Bushing for Bearing
- Outer Diameter: 8mm
- Bore Diameter: 4.76mm
- Material: Steel
Approved Applications
- Adapting bearing bore sizes on CMT router bits and tooling
- Reducing collet bore dimensions to achieve correct bearing fit on routers and router tables
Frequently Asked Questions
What size does this reduction bushing adapt between?
This bushing has an outer diameter of 8mm (5/16") and a bore diameter of 4.76mm (3/16"), allowing you to adapt a bearing or collet from the larger bore down to the smaller dimension.
What material is this bushing made from?
The CMT 799.017.00 reduction bushing is made from steel, which provides the strength and dimensional stability required to maintain a precise, wobble-free fit during router operation.
What tools or machines is this bushing compatible with?
This reduction bushing is designed for use with routers and router tables, specifically for adapting CMT router bits and bearing tooling to the correct bore size.
Why would I need a reduction bushing for a bearing?
When a bearing's inner bore is larger than the shaft or collet it needs to mount on, a reduction bushing fills that gap precisely. This lets you reuse existing bearings and bits rather than replacing components, while maintaining accurate tool alignment and cut quality.
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