Product Description
CMT Spacer - 20mm Outer Diameter, 12mm Bore, 3mm Thick by CMT is a precision-ground assembly spacer designed to fine-tune tool positioning on spindles and cutter head setups. With an outer diameter of 20mm, a 12mm bore, and a plate thickness of 3mm, this compact spacer gives woodworkers and machinists exact control over cutter placement, stacking depth, and axial spacing in router table and cutter head assemblies. Whether you are adjusting the lateral position of a cutter on a spindle or stacking multiple cutters to reach a target profile width, this spacer delivers the dimensional accuracy needed for repeatable, consistent results.
Key Features
- 20mm outer diameter - sized to fit correctly within compatible CMT cutter head and tooling systems, ensuring the spacer seats properly without play or misalignment.
- 12mm bore diameter - matches standard 12mm spindle and arbor diameters, allowing the spacer to slide on cleanly and center accurately for reliable tool registration.
- 3mm plate thickness - provides a precise, known offset in a slim profile, so assemblers can stack multiple spacers to build up exact spacing increments without guesswork.
- Designed for assembly use - purpose-built as an assembly spacer, meaning it is engineered to maintain its dimensional integrity under the clamping forces common in cutter head stacking applications.
Why This Product
- A 3mm plate thickness gives you a predictable, repeatable increment for adjusting cutter position on a spindle - stack as many as needed to dial in your exact setup without cutting trial-and-error shims.
- The 12mm bore and 20mm outer diameter combination covers a common tooling interface, making this spacer a practical fit for a range of CMT cutter head configurations that use a 12mm arbor.
- Compact 3mm profile means minimal stack height is consumed per spacer, preserving thread engagement and clamping capacity when multiple spacers are used together.
- As a dedicated assembly spacer from CMT, it is manufactured to the dimensional tolerances expected in precision tooling setups, reducing the risk of runout or positional error that a makeshift shim might introduce.
Specifications
- Manufacturer Part Number: 541.511.00
- Brand: CMT Orange Tools
- Product Type: Spacer for Assembly
- Outer Diameter: 20mm
- Bore Diameter: 12mm
- Plate Thickness: 3mm
Approved Applications
- Adjusting cutter position axially on a spindle or arbor
- Stacking cutters to achieve a desired total cutting width
- Cutter head assembly and tooling configuration
Frequently Asked Questions
What are the exact dimensions of this spacer?
This spacer has an outer diameter of 20mm, a bore diameter of 12mm, and a plate thickness of 3mm. These three measurements define its fit and the offset it introduces in a cutter assembly stack.
What spindle or arbor size does this spacer fit?
The bore diameter is 12mm, so this spacer is designed to slide onto a 12mm spindle or arbor. Confirm your tooling uses a 12mm arbor before ordering.
Can I stack multiple CMT 541.511.00 spacers to create a larger offset?
Yes. Because the plate thickness is a consistent 3mm, multiple spacers can be stacked to build up offset in predictable 3mm increments. For example, two spacers together create a 6mm offset, three create 9mm, and so on. Ensure adequate thread engagement and clamping length remain when stacking.
What is this spacer used for in a cutter head assembly?
This is a spacer for assembly applications. Its primary roles are adjusting the lateral or axial position of a cutter on a spindle and separating or stacking cutter heads to reach a target profile width or spacing configuration.
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