The CMT JS1243HM Special Reciprocating Saw Blade is a 12-inch carbide-tipped cutting tool engineered for demanding applications in fiber cement, porous concrete, and other abrasive specialty materials. With a coarse 2 TPI tooth configuration and tungsten carbide (HW) tips, this blade delivers controlled, aggressive cuts through difficult substrates that would rapidly dull conventional bi-metal blades. Sold as a single blade, it is a purpose-built solution for contractors and tradespeople who regularly work with hard, abrasive building materials.

Key Features

• Carbide-Tipped (HW) Teeth - tungsten carbide tips bonded to the blade body maintain cutting edge integrity far longer than standard steel teeth when working through fiber cement panels, porous concrete, and other abrasive specialty materials, reducing blade swap time on the job.
• 2 TPI Coarse Tooth Geometry - the ultra-low tooth count drives fast, aggressive stock removal through thick, hard materials, keeping the blade moving efficiently rather than binding or overheating.
• 12-Inch Total Length with 10-Inch Cutting Height - the extended blade body provides a full 10 inches of usable cutting length, giving you reach for deep cuts in thick sections without repositioning.
• Maximum Material Thickness Up to 8 1/2 Inches - rated for material thicknesses under 8 1/2 inches, this blade handles the heavy cross-sections common in masonry and specialty construction panels in a single pass.
• 0.059-Inch Blade Thickness - the robust blade body is dimensioned to resist flexing and deflection under the shock loads generated when cutting porous concrete and fiber cement, helping maintain a straighter cut line.
• 50mm (Approximately 2-Inch) Cutting Depth - the blade geometry supports a cutting depth of 50mm, suited to the panel thicknesses typically encountered in fiber cement and specialty siding applications.

Why This Product

• Fiber cement siding and porous concrete are among the most blade-wearing materials in construction - the carbide-tipped (HW) tooth design on this blade is specifically matched to these abrasive substrates, making it a targeted solution rather than a general-purpose blade pressed into service.
• At 12 inches total length with a 10-inch cutting height, this blade reaches deep into thick specialty materials that shorter blades cannot clear, reducing the need for multiple cuts or repositioning on wide panels.
• The 2 TPI tooth pitch is optimized for coarse, fast cutting through hard specialty materials - a finer-toothed blade would load up and slow dramatically in the same applications, while this geometry keeps cuts moving.
• Designed for the JSR class of reciprocating saw blades, this is a purpose-built specialty blade for the specific challenge of cutting fiber cement, porous concrete, and similar materials - not a compromised multi-material blade.

Specifications

• Manufacturer Part Number: JS1243HM
• Brand: CMT Orange Tools
• Total Length: 12"
• Cutting Height: 10"
• Cutting Depth: 50mm
• Teeth Thickness: 0.059"
• Number of Teeth: 2 TPI
• Maximum Material Thickness: Less than 8 1/2"
• Blade Material: HW (Carbide-Tipped)
• Quantity: 1-Piece

Approved Applications

• Special Materials
• Fiber Cement Panels
• Porous Concrete

What's Included

• 1x CMT JS1243HM Reciprocating Saw Blade (12" x 2 TPI)