The CMT Contractor ITK Plus Fast Framing Saw Blade - 6-1/2" x 20mm, 24-Tooth ATB+Shear is a metric-arbor circular saw blade engineered for professionals who need fast, aggressive cuts through framing lumber, structural panels, and engineered wood products. Designed specifically for cordless circular saws and track saws with metric bore sizing, this blade combines an Alternate Top Bevel geometry with an 8 deg. shear angle to deliver cleaner crosscuts and rips in softwood, hardwood, plywood, OSB, and pressure-treated lumber - with less splintering and reduced tear-out on every pass.

Key Features

• 24-Tooth ATB+Shear Geometry (10 deg. ATB + 8 deg. Shear) - the combination of alternate top bevel and shear angles produces fast stock removal while minimizing surface tear-out, making this blade well-suited for both rough framing and finish-quality crosscuts in structural lumber and sheet goods.
• 18 deg. Hook (Cutting) Angle - a positive hook angle pulls material into the cut aggressively, accelerating feed rate and reducing operator effort during long ripping sessions or repetitive framing cuts.
• Hardmetal (HW) Tipped Teeth - carbide-grade tooth material resists heat and abrasion, sustaining edge sharpness longer when cutting through dense hardwoods, pressure-treated lumber, and abrasive composite panels.
• 0.067" Kerf / 0.043" Plate Thickness - a thin kerf removes less material per pass, reducing strain on cordless tool batteries and allowing faster, more efficient cutting with lower-torque metric-arbor saws.
• 20mm Bore with 5/8" Adapter Compatibility - the 20mm metric bore fits track saws and cordless circular saws with metric arbors, while the included adapter pin holes (2/6/32 pattern) allow compatibility with a wider range of tool configurations.
• Orange Chrome Coating - a chromium layer electrolytically deposited on the plate increases wear resistance, protects against corrosion, and extends overall blade service life - particularly valuable in outdoor framing environments or when cutting wet or pressure-treated stock.
• Laser-Cut Steel Plate - laser cutting maintains tight dimensional tolerances across the plate, contributing to stable, accurate tracking through the cut and reducing blade wobble at operating speed.
• Polymer-Filled Sound-Dampening Slots - laser-cut slots filled with polymer material reduce vibration and noise during operation, improving control and comfort during extended use on the jobsite.
• Precision-Sharpened Teeth - each tooth is sharpened to tight tolerances at the factory, ensuring consistent cut quality and a longer interval between resharpenings across the blade's service life.

Why This Product

• Built for metric-arbor tools - the 20mm bore diameter targets cordless circular saws and track saws that use metric arbors, a specification not met by standard 5/8" imperial blades, making this the correct fit for those tool platforms.
• ATB+Shear tooth design spans framing and finish work - unlike a standard flat-top or pure ATB blade, the combined 10 deg. ATB and 8 deg. shear geometry handles aggressive ripping and cleaner crosscutting in a single blade, reducing the need to swap blades between framing and trimming tasks.
• Thin kerf extends cordless runtime - at 0.067" kerf width against a 0.043" plate, the blade is optimized to draw less power from battery-powered saws, directly extending cut count per charge on the jobsite.
• Corrosion-resistant coating suits outdoor and treated-lumber environments - the electrolytically deposited chrome layer is a practical advantage when cutting pressure-treated lumber or working in exposed outdoor framing conditions where moisture and chemical exposure accelerate wear on uncoated blades.

Specifications

• Manufacturer Part Number: 271.165.24H
• Brand: CMT Orange Tools
• Diameter: 6-1/2"
• Number of Teeth: 24
• Bore Diameter: 20mm (+15.88mm)
• Pin Hole: 2/6/32
• Tooth Grind: ATB+Shear
• Sharpening Configuration: 10 ATB + 8 Shear
• Cutting Angle: 18 deg.
• Kerf Thickness: 0.067"
• Plate Thickness: 0.043"
• Tooth Material: HW (Hardmetal/Carbide)

Approved Applications

• Ripping - solid lumber and sheet goods along the grain
• Crosscuts - cutting softwood, hardwood, plywood, OSB, and pressure-treated lumber across the grain
• Framing - structural lumber cuts in residential and commercial framing applications
• Track saw operations - guided straight cuts in plywood and OSB panels
• Cordless circular saw use - optimized for battery-powered metric-arbor saws

Frequently Asked Questions

What is the difference between the ATB+Shear tooth grind and a standard ATB grind?

A standard ATB (Alternate Top Bevel) grind bevels alternating teeth in opposite directions to shear material cleanly. The ATB+Shear configuration on this blade adds an 8 deg. shear angle to that geometry - on this blade expressed as 10 deg. ATB combined with 8 deg. shear - which further tilts the cutting edge to reduce tear-out on the top face of the workpiece. This makes the blade more effective for crosscutting plywood, OSB, and finish lumber where surface quality matters, while still maintaining the speed needed for framing work.

Will this blade fit my standard 5/8" arbor circular saw?

This blade has a 20mm primary bore diameter (equivalent to approximately 15.88mm in alternate sizing), which is designed for metric-arbor tools such as cordless circular saws and track saws with 20mm arbors. The blade includes pin hole provisions (2/6/32 pattern) to support adapter use. Verify your saw's arbor size before installation to confirm compatibility.

What materials can this blade cut?

The 24-tooth ATB+Shear geometry and hardmetal-tipped teeth make this blade suitable for cutting softwood, hardwood, plywood, OSB, and pressure-treated lumber. The chrome-coated plate offers additional resistance to the moisture and chemical exposure commonly associated with pressure-treated stock.

Why does kerf thickness matter when choosing a circular saw blade?

Kerf thickness - the width of material removed with each pass - directly affects how much resistance the saw motor must overcome. At 0.067" kerf, this blade is a thin-kerf design relative to its plate thickness of 0.043", which reduces cutting resistance. On cordless, battery-powered tools this translates to less power draw per cut, helping extend battery runtime over the course of a work session.