Product Description
CMT Bore Reducers - 3/4" to 1/2" (Pair) from CMT are precision-fit reducing bushings designed to adapt cutter heads, saw blades, and other tooling with a 3/4" bore down to a 1/2" arbor. Used in pairs for safe and centered tool mounting, these bore reducers are a reliable solution for spindle moulders, shapers, and table saws where arbor and bore sizes do not match. Having the right bore adapter on hand means you can run more tooling on your existing machines without the cost of purchasing additional dedicated arbors.
Key Features
- Adapts 3/4" bore to 1/2" arbor - lets you mount tooling bored at 3/4" onto a 1/2" spindle or arbor, expanding the range of cutters and blades you can use on a single machine.
- Must be installed in pairs - using both reducers together ensures the tool seats concentrically on the arbor, eliminating wobble and maintaining safe, balanced operation.
- Precision ground to close tolerances - accurate centering of the mounted cutter or blade reduces runout, which translates directly to cleaner cuts and longer tool life.
- Sold as a pair (2 pieces) - the package includes both reducers needed for a complete, properly balanced installation, so you have everything required right out of the box.
Why This Product
- Solves the common problem of mismatched bore and arbor sizes on spindle moulders, shapers, and table saws - allowing you to use a wider variety of tooling without purchasing new arbors or dedicated tooling sets.
- Packaged as a matched pair so both reducers are always available together, ensuring you never install only one reducer by mistake - a critical safety consideration for rotating tool applications.
- Precision fit at the 12.7 mm (1/2") bore ensures the adapted tool runs true on the arbor, protecting both the workpiece finish and the cutting tool itself.
- CMT bore reducers are purpose-built for professional woodworking machines, making them a straightforward, dependable choice when you need a 3/4"-to-1/2" bore reduction solution for shop use.
Specifications
- Manufacturer Part Number: 699.019.13
- Brand: CMT Orange Tools
- Original Bore Diameter: 3/4"
- Reduced Bore Diameter: 12.7 mm (1/2")
- Quantity: 2 pieces (must be used in pairs)
Approved Applications
- Spindle Moulder
- Shaper
- Table Saw
- Bore Reduction
- Tool Mounting
What's Included
- 2x Bore Reducers (3/4" to 1/2")
Frequently Asked Questions
Can I use just one bore reducer instead of both at the same time?
No. These bore reducers must always be installed in pairs. Using only a single reducer creates an unbalanced, off-center condition on the arbor, which is unsafe for rotating cutting tools. Always install both pieces together as a set.
What machines are these bore reducers compatible with?
These reducers are designed for use on spindle moulders, shapers, and table saws - any machine where the arbor or spindle measures 1/2" and the cutter head or blade has a 3/4" bore.
What exact bore sizes do these reducers cover?
These reducers adapt a 3/4" original bore down to a 1/2" (12.7 mm) arbor. They are specifically sized for this one combination and are not intended for other bore or arbor size pairings.
Why does precision fit matter for bore reducers?
A precisely ground bore reducer centers the cutting tool accurately on the arbor, minimizing runout. Reduced runout means cleaner, more consistent cuts and less stress on both the tool and the machine spindle during operation.
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