Product Description
The CMT 541.520.00 Spacer is a precision-machined assembly component designed to fine-tune tool positioning on spindles and cutter head setups. With an outer diameter of 21mm, a bore diameter of 12mm, and an ultra-thin plate thickness of just 0.3mm, this CMT spacer delivers the exact incremental adjustment needed to stack cutters, align tooling, or achieve a target cutting width with accuracy. Whether you are setting up a cutter head assembly or dialing in tool height on a spindle, this slim shim-style spacer gives you the control to get it right.
Key Features
- Outer diameter of 21mm - sized to fit within standard CMT cutter head and tooling configurations, ensuring a secure and stable seating on the assembly.
- Bore diameter of 12mm - mates precisely with 12mm spindles and arbors, eliminating play or wobble during operation for accurate, repeatable results.
- Plate thickness of 0.3mm - an ultra-thin profile allows for very fine incremental adjustments to tool position, giving you granular control over stack height and cutter spacing.
- Designed as an assembly spacer - purpose-built for use in cutter head and tooling assemblies, making it a reliable component when precise gap management between cutters or tool components is required.
Why This Product
- The 0.3mm plate thickness makes this spacer ideal for situations where even a fraction of a millimeter matters - such as matching a target groove width or eliminating unwanted lateral movement between stacked cutters.
- The 12mm bore paired with the 21mm outer diameter provides a compact, well-proportioned fit that works within tight assembly configurations without adding unnecessary bulk.
- Using a dedicated precision spacer rather than improvised shims ensures consistent, repeatable tool positioning across setups, reducing setup time and the risk of out-of-spec cuts.
- As a CMT component, this spacer is engineered to integrate with CMT tooling systems, so you can trust dimensional compatibility when building out or fine-tuning a cutter head assembly.
Specifications
- Manufacturer Part Number: 541.520.00
- Brand: CMT Orange Tools
- Description: SPACER D=12/21x0.3mm
- Outer Diameter: 21mm
- Bore Diameter: 12mm
- Plate Thickness: 0.3mm
- Status: Active
Approved Applications
- Cutter head assembly and tooling setup
- Adjusting tool position on a spindle or arbor
- Stacking cutters to achieve a desired total cutting width
- Fine incremental spacing between tooling components
Frequently Asked Questions
What are the exact dimensions of this spacer?
This spacer has an outer diameter of 21mm, a bore diameter of 12mm, and a plate thickness of 0.3mm. These dimensions are printed in the CMT part description as D=12/21x0.3mm, where 12 is the bore and 21 is the outer diameter.
What is this spacer used for?
This component is designed as an assembly spacer - it is used to adjust tool positioning along a spindle or arbor, separate stacked cutters to a desired width, or manage precise gaps between tooling components in a cutter head assembly.
Why would I need a spacer as thin as 0.3mm?
A 0.3mm spacer is used when very fine adjustments to tool position are needed - for example, when the difference between cutter positions must be controlled to within fractions of a millimeter to achieve an exact groove width or to align cutting edges with precision.
Is this spacer compatible with 12mm spindles and arbors?
Yes. The bore diameter of this spacer is 12mm, meaning it is designed to slide onto 12mm spindles or arbors as part of a cutter head or tooling assembly configuration.
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