Product Description
CMT Pair of Bore Reducers - 30mm to 3/4" by CMT are precision-ground adapter rings designed to convert cutter heads, saw blades, and other rotary tooling with a 30mm bore down to a 3/4" (19.05mm) arbor. This two-piece set makes it straightforward to mount large-bore European tooling onto standard 3/4" spindles found on spindle moulders, shapers, and table saws - eliminating compatibility gaps between metric and imperial tooling systems without the need for replacement blades or heads.
Key Features
- Outer diameter of 30mm - fits securely into cutter heads and saw blades bored to the common 30mm European standard, ensuring a snug, rattle-free seating in the tool body.
- Inner bore of 19.05mm (3/4") - adapts your 30mm-bore tooling directly onto a 3/4" spindle or arbor, bridging the gap between metric tooling and imperial machine spindles.
- Must be used in pairs - installing both reducers together ensures the tool is centered evenly on both faces of the bore, promoting balanced rotation and safer tool mounting.
- Precision-ground fit - close manufacturing tolerances mean accurate tool centering on the spindle, which reduces vibration and helps maintain cut quality over repeated use.
- Compatible with spindle moulders, shapers, and table saws - versatile across multiple machine types, so one pair of reducers serves a range of workshop or production setups.
Why This Product
- Solves the metric-to-imperial tooling mismatch - if you run a 3/4" spindle machine but need to use 30mm-bore cutter heads or saw blades, this pair provides a direct, purpose-built solution without modifying either the tool or the machine.
- Paired design promotes safe, centered mounting - using two reducers simultaneously rather than a single ring distributes clamping force evenly across both sides of the bore, which is critical for safe high-speed operation on a shaper or spindle moulder.
- Expands tooling compatibility across machines - a single pair works across spindle moulders, shapers, and table saws, giving workshops flexibility to share 30mm-bore tooling between different machines fitted with 3/4" arbors.
- Precise fit supports consistent cut quality - the close bore tolerances help keep the cutter head or blade running true to center, reducing runout that could lead to uneven cuts or premature tool wear.
Specifications
- Manufacturer Part Number: 699.030.19
- Brand: CMT Orange Tools
- Outer Diameter: 30mm
- Inner Bore Diameter: 19.05mm (3/4")
- Quantity: 2 pieces (must be used in pairs)
Approved Applications
- Bore reduction from 30mm to 3/4"
- Tool mounting on spindle moulders
- Tool mounting on shapers
- Tool mounting on table saws
What's Included
- 2x bore reducers (30mm outer diameter, 3/4" inner bore)
Frequently Asked Questions
Can I use just one bore reducer instead of both?
No. These bore reducers must always be installed as a pair. Using only one reducer would result in uneven support across the bore, which compromises centering accuracy and creates a potentially unsafe condition during high-speed operation on a spindle moulder, shaper, or table saw.
What size spindle or arbor do these reducers fit?
The inner bore diameter is 19.05mm, which corresponds to a standard 3/4" spindle or arbor. The outer diameter is 30mm, fitting cutter heads or saw blades that have a 30mm bore.
What types of tooling are these bore reducers designed to adapt?
These reducers are designed for cutter heads and saw blades with a 30mm bore. They are suitable for use on spindle moulders, shapers, and table saws equipped with a 3/4" spindle or arbor.
Are these bore reducers sold as individual pieces or as a set?
They are sold as a pair - two reducers per order. Because they must always be installed together, CMT supplies them in a matched set under part number 699.030.19.
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