Bosch Bi Metal Hole Saw HBT225 2-1/4 Inch M42 (8 Percent Cobalt Progressor Tooth Triangle Slot Wood Metal Drywall Cutting Accessory)

Bosch HBT225 2-1/4 Inch M42 Bi-Metal Progressor Tooth Hole Saw

The Bosch HBT225 is a 2-1/4-inch diameter bi-metal hole saw constructed with an 8% cobalt M42 alloy composition to execute smooth, clean penetrations through dimensional lumber, sheet metal, drywall, and plastic. Featuring variable 5 TPI Progressor tooth geometry and a 1-3/4-inch cutting depth capacity, this heavy-duty cutter accelerates material removal while offering 20% longer service life in high-friction drilling conditions. Equipped with side triangle slots for rapid slug ejection and reinforced shoulders to absorb rotational stress, it pairs with standard arbors and SpinLOCK systems to drill door hardware prep openings, pipe clearances, and electrical junction pass-throughs.

Best Used For:

• Door Hardware & Lockset Hole Coring: Drilling precise 2-1/4-inch cross-bore openings through solid wood doors, composite slabs, and metal-clad doors.
• Plumbing & Mechanical Pipe Clearance: Slicing clean pass-throughs through floor joists, subfloors, and studs for 1-1/2-inch PVC lines and copper piping.
• Electrical Conduit & Drywall Wall Pass-Throughs: Executing fast, burr-free cuts through multi-layer drywall, plasterboard, and metal stud framing panels.

Key Performance & Safety Features

• 8% Cobalt M42 Alloy Matrix: Premium cobalt-infused high-speed steel edge resists thermal breakdown to extend cutter life by up to 20%.
• Progressor Variable Tooth Geometry: Alternating 5 TPI tooth pitch cuts rapidly through softwoods and thick metals while dampening operational chatter.
• Rapid Plug Removal Triangle Slots: Side slot access geometry allows easy screwdriver insertion to push out core plugs and dissipate cutting friction.
• Deep Cup 1-3/4-Inch Cutting Reach: Extended cup barrel depth allows single-pass cutting through 2x dimensional lumber and stacked wall materials.
• Reinforced Shoulder Architecture: Heavy-duty backing plate and strengthened shoulders prevent tooth stripping under high-torque drilling loads.
• Universal Arbor Fitment: Compatible with standard 1/2-20 thread arbors, Quick Change setups, and Bosch SpinLOCK system hubs.

What's Included

• (1) Bosch HBT225 2-1/4" Bi-Metal M42 Hole Saw

Technical Specifications

Pro-Tip: When cutting mild steel or structural metal framing with this M42 bi-metal hole saw, maintain the recommended 195 RPM operating speed and apply cutting fluid to preserve tooth sharpness and prevent cobalt edge overheating.