The CMT Reduction Ring for Saw Blades is a precision-machined arbor adapter bushing designed to reduce a 1-inch (25.4mm) outer diameter bore down to a 15.88mm (5/8-inch) inner bore, giving woodworkers and tradespeople the flexibility to mount 1-inch bore saw blades onto machines with smaller arbors. Whether you are fitting a table saw blade, a miter saw blade, or a circular saw blade, this saw blade arbor adapter ring delivers a secure, properly sized fit that keeps your cutting operations accurate and consistent. CMT offers this reducing bushing in a range of sizes, making it easy to match the right adapter to your specific arbor and blade combination.

Key Features

• Outer Diameter of 1 inch (25.4mm) - fits precisely into saw blades with a 1-inch arbor hole, ensuring no play or wobble during operation.
• Inner bore of 15.88mm - reduces the blade's mounting hole to accept a 5/8-inch arbor, expanding your blade library to work across machines with different arbor sizes.
• Maximum thickness of 0.055 inches - an ultra-thin profile that sits flush within the blade's arbor hole without interfering with blade seating or clamping.
• Adjustable arbor hole compatibility - the circular saw blade bushing is engineered to bridge the gap between blade bore and arbor size, so you can use blades you already own on a wider range of saws.
• Available in different saw blade arbor adapter ring sizes - select the exact reduction ring that matches your setup rather than being limited to a single size option.

Why This Product

• Rather than purchasing a separate saw blade for every machine you own, this arbor reducing bushing lets a single 1-inch bore blade work on a 5/8-inch arbor machine, reducing tooling costs and simplifying your blade inventory.
• The 15.88mm inner bore is machined to precise tolerances, meaning the ring seats firmly on the arbor without looseness - a critical factor for safe, vibration-free cutting with table saws, miter saws, and circular saws.
• At just 0.055 inches thick, this reduction ring adds virtually no profile to the blade stack, so blade guards, washers, and arbor nuts continue to fit and function exactly as intended.
• CMT's reduction ring is purpose-built for saw blades specifically, making it a more reliable choice than generic spacers or improvised adapters when blade-to-arbor fit matters for cut quality and operator safety.

Specifications

• Manufacturer Part Number: 299.216.00
• Brand: CMT Orange Tools
• Outer Diameter: 1 inch (25.4mm)
• Small Diameter: 15.88mm
• Bore Diameter: 15.88mm
• Maximum Thickness: 0.055 inches
• Application: Reduction ring for saw blades

Approved Applications

• Arbor size reduction for circular saw blades
• Arbor size reduction for table saw blades
• Arbor size reduction for miter saw blades
• Adapting 1-inch bore blades to 5/8-inch arbor machines

Frequently Asked Questions

What does this reduction ring actually do?

This saw blade reducing bushing is placed inside the arbor hole of a saw blade that has a 1-inch (25.4mm) bore. It reduces that opening to 15.88mm, allowing the blade to mount securely on a machine with a 5/8-inch arbor rather than a 1-inch arbor.

What is the maximum thickness of this reduction ring, and will it affect blade installation?

The maximum thickness is 0.055 inches. This slim profile is designed to sit within the blade bore without adding meaningful height to the blade assembly, so standard arbor hardware - including washers and locking nuts - continues to fit and function normally.

Is this ring compatible with all saw types?

The CMT saw blade arbor adapter ring is designed for use with circular saw blades, table saw blades, and miter saw blades. As long as the blade has a 1-inch bore and the machine has a 5/8-inch arbor, this bushing is the correct fit for that combination.

Does CMT offer this reduction ring in other sizes?

Yes. CMT makes reduction rings available in different saw blade arbor adapter ring sizes, so you can find the specific outer-to-inner diameter combination that matches your blade bore and arbor requirements beyond the 1-inch to 15.88mm pairing offered by this particular ring.