Product Description
CMT Pair of Bore Reducers - 1" to 3/4" by CMT are precision-ground adapter rings designed to mount cutter heads, dado sets, or saw blades with a 1" bore onto 3/4" spindles and arbors. These bore reduction rings make it straightforward to adapt your existing tooling to a different machine spindle without purchasing entirely new blades or heads - saving both cost and setup time on spindle moulders, shapers, and table saws.
Key Features
- Bore reduction from 1" to 3/4" - allows cutter heads and saw blades with a 1" bore to mount securely on 3/4" arbors and spindles, expanding the range of machines your existing tooling can fit.
- Must be installed in pairs - using both reducers simultaneously ensures the tool is centered evenly on the arbor, producing accurate cuts and safe, balanced operation.
- Precision-fit design - ground to close tolerances so the adapted tool runs true, minimizing vibration and runout for cleaner results on shapers, spindle moulders, and table saws.
- Two pieces included per order - the pair is supplied together, so you have everything needed for a properly balanced installation right out of the package.
Why This Product
- Adapting a 1" bore blade or cutter head to a 3/4" spindle is a common challenge when switching between machines - these reducers solve that directly without requiring new tooling.
- Because the reducers must be used in pairs, the included two-piece set means your installation is complete and balanced from the start, with no additional hardware to source separately.
- The 1" outer diameter (19.05 mm bore) fits a widely used standard tool bore size, making these reducers compatible across a broad range of cutter heads and saw blades used on spindle moulders and shapers.
- CMT manufactures these to tight dimensional tolerances, so the reduced-bore fit is snug and accurate - important for safe high-speed tool operation on table saws and moulding machines.
Specifications
- Brand: CMT Orange Tools
- Order Number: 699.026.19
- Original Bore Diameter: 1"
- Reduced Bore Diameter: 3/4"
- Bore (millimeters): 19.05 mm
- Quantity: 2 pieces (must be used in pairs)
Approved Applications
- Bore reduction - adapting 1" bore tooling to 3/4" spindles and arbors
- Tool mounting on spindle moulders
- Tool mounting on shapers
- Blade and cutter head mounting on table saws
What's Included
- 2x bore reducer rings (1" to 3/4")
Frequently Asked Questions
Can I use just one bore reducer instead of the full pair?
No. These bore reducers must always be installed in pairs. Using only one reducer will not center the tool correctly on the arbor and can result in unsafe, unbalanced tool operation. Always install both pieces together.
What machines are these bore reducers compatible with?
These reducers are designed for use on spindle moulders, shapers, and table saws - any machine where a cutter head or saw blade with a 1" bore needs to mount on a 3/4" spindle or arbor.
What is the bore diameter in millimeters?
The bore diameter is 19.05 mm, which corresponds to the 3/4" reduced bore size. This is the inner dimension that fits the 3/4" spindle after reduction from the 1" original bore.
Why is precise centering important when using bore reducers?
When a cutter head or saw blade spins at high speed, any off-center mounting creates vibration and runout that affects cut quality and safety. These reducers are ground to close tolerances so the tool seats accurately, minimizing those risks on shapers, spindle moulders, and table saws.
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