The CMT 299.237.00 Reduction Ring for Saw Blades is a precision-machined arbor adapter bushing designed to reduce a 7/8 inch (22.2mm) outer diameter down to a 15mm inner bore, giving woodworkers and tradespeople the flexibility to mount circular saw blades with a 15mm arbor hole onto saws with a 7/8 inch spindle. This saw blade reducing bushing is available in different arbor adapter ring sizes, making it a practical solution whenever a blade's bore does not match the machine's arbor - no blade replacement required, just a simple, secure fit.

Key Features

• Outer diameter of 7/8 inch (22.2mm) reducing to a 15mm inner bore - allows blades with a 15mm arbor hole to mount precisely on 7/8 inch spindles, expanding blade compatibility without purchasing a new blade.
• Maximum thickness of 0.055 inch - the low-profile design keeps the blade seated flush and properly aligned on the arbor, preserving cut accuracy.
• Adjustable arbor hole compatibility - the circular saw blade bushing offers an adjustable arbor hole, making it versatile across a range of saw blade diameters and styles.
• Available in different saw blade arbor adapter ring sizes - allows users to build a set of reducers to match multiple blade-and-machine combinations without redundancy.
• Engineered to precise tolerances - a secure, wobble-free fit between blade and arbor reduces vibration and supports cleaner, safer cutting performance.

Why This Product

• Solves a common arbor mismatch problem - when a quality saw blade has a 15mm bore but the saw runs a 7/8 inch spindle, this reduction ring bridges the gap cleanly so the blade can be used as intended.
• Precision-machined for a secure fit - a well-seated arbor bushing eliminates unwanted blade movement during operation, which directly affects the quality and straightness of each cut.
• Compact, low-profile design - at a maximum thickness of 0.055 inch, the ring adds virtually no stack height, preserving the full usable cutting depth of the saw blade.
• Versatile across saw types - this circular saw blade bushing is designed to work with miter saw blades, table saw blades, and other circular saw blades, making it a single accessory that works across multiple machines in a shop.

Specifications

• Manufacturer Part Number: 299.237.00
• Brand: CMT Orange Tools
• Outer Diameter: 7/8 inch (22.2mm)
• Small Diameter: 15mm
• Bore Diameter: 15mm
• Maximum Thickness: 0.055 inch

Approved Applications

• Arbor size reduction for circular saw blades
• Bore reduction for miter saw blades
• Bore reduction for table saw blades
• Adjustable arbor hole fitting for saw blade accessories

Frequently Asked Questions

What does this reduction ring do exactly?

The CMT 299.237.00 is a saw blade arbor adapter bushing that reduces the bore of a circular saw blade from 7/8 inch (22.2mm) down to 15mm, allowing a blade with a 15mm arbor hole to fit securely onto a saw with a 7/8 inch spindle.

What is the thickness of this reduction ring?

The maximum thickness of the 299.237.00 reduction ring is 0.055 inch, which is a low-profile dimension that keeps the blade sitting flush and correctly aligned on the arbor without adding significant stack height.

Is this ring compatible with both table saws and miter saws?

Yes. This saw blade reducing bushing is designed for use with circular saw blades in general, including table saw blades and miter saw blades, wherever a 7/8 inch to 15mm arbor reduction is needed.

Are other reduction ring sizes available from CMT?

Yes. This product is part of a line of saw blade arbor adapter rings available in different sizes, so if your blade and arbor combination requires a different reduction, additional options exist within the CMT reduction ring series.