Irwin 373300BX Bi-metal Hole Saw 3 Inches

Product Description

The IRWIN 373300BX is a bi-metal hole saw with a 3-inch cutting diameter, built for trade professionals who need reliable performance across a wide range of materials. The bi-metal construction combines a hardened high-speed steel tooth band with a flexible alloy steel body, delivering durability under repeated use. Rated at 115 RPM, it is suited for controlled-speed drilling through wood, aluminum, copper, iron, stainless steel, and zinc. Electricians, plumbers, and HVAC technicians reach for this saw when cutting clean, accurate holes in both structural and mechanical applications.

This hole saw fits typical trade install scenarios where multi-material cutting is required in a single job — running conduit through framing, cutting pipe penetrations, or sizing knockouts in sheet metal enclosures. Its 3-inch diameter is a common size for pipe and conduit rough-in work in residential and light commercial construction. The bi-metal design reduces the need to switch between saws when moving from wood substrate to metal backing on the same penetration.

Key Features

• Bi-metal construction with high-speed steel teeth for extended tooth life across hard and soft materials
• 3-inch cutting diameter suits common conduit, pipe, and knockout applications
• Cuts wood, aluminum, copper, iron, stainless steel, and zinc in a single tool
• 115 RPM operating speed rating supports controlled cutting to reduce heat buildup
• Sold individually — each unit is one hole saw

Compatibility

Designed for use with standard arbor-style hole saw mandrels compatible with 3-inch bi-metal hole saws. Fits corded and cordless drills and drill presses accepting a standard hole saw arbor shank.

Installation Notes

This hole saw is installed and used by electricians, plumbers, and HVAC technicians working to NEC, IPC, and IFGC rough-in requirements. Secure the arbor firmly before use and confirm the workpiece is clamped or otherwise restrained to prevent rotation during cutting. Use cutting fluid or wax when working through ferrous metals to reduce heat and extend tooth life. Wear appropriate PPE including eye protection when operating any hole saw.

Technical Specifications

• Cutting Diameter: 3 inches
• Maximum Speed: 115 RPM
• Tooth Material: Bi-metal (high-speed steel teeth)
• Compatible Materials: Wood, aluminum, copper, iron, stainless steel, zinc
• Weight: 0.45 pounds
• Sold As: Each

Standard Information

• Brand: IRWIN
• Manufacturer Part Number: 373300BX