Irwin 373118BX Bi-metal Hole Saw 1-1/8 Inches

Product Description

The IRWIN 373118BX is a bi-metal hole saw with a 1-1/8 inch cutting diameter, built for trade professionals who need reliable performance across multiple materials. Bi-metal construction combines a high-speed steel tooth edge with a flexible alloy steel body, allowing the saw to resist tooth strippage under load while maintaining a consistent cut. Rated at 300 RPM, this hole saw is designed to cut wood, aluminum, copper, iron, stainless steel, and zinc. Electricians, plumbers, and HVAC technicians commonly reach for this size when cutting knockout holes for conduit, pipe, or drain fittings through framing, panels, and sheet metal.

The 373118BX suits a wide range of residential and light commercial field applications. The 1-1/8 inch diameter makes it a standard choice for conduit knockouts, plumbing rough-ins, and sheet metal penetrations. It fits standard arbors compatible with bi-metal hole saws and is sold individually, making it easy to replace a single worn saw without purchasing a full kit.

Key Features

• Bi-metal construction for extended tooth life across hard and soft materials
• 1-1/8 inch cutting diameter suits common conduit and pipe rough-in applications
• Rated at 300 RPM for controlled cutting in metal and wood
• Cuts wood, aluminum, copper, iron, stainless steel, and zinc
• Sold individually for single-saw replacement without a full kit purchase

Compatibility

Designed as an OEM-style replacement or field-use bi-metal hole saw compatible with standard arbors accepting bi-metal hole saw bodies.

Installation Notes

Installation of this hole saw is performed by electricians, plumbers, and HVAC technicians using a standard drill or hole saw arbor. Secure the workpiece before cutting and use appropriate cutting fluid when drilling through metal to reduce heat buildup and extend tooth life. Always follow NEC and IPC guidelines when sizing penetrations for conduit or piping. Wear appropriate PPE, including eye protection, when operating hole saws in any material.

Technical Specifications

• Cutting Diameter: 1-1/8 inches
• Maximum Speed: 300 RPM
• Construction: Bi-Metal
• Compatible Materials: Wood, Aluminum, Copper, Iron, Stainless Steel, Zinc
• Weight: 0.2 pounds
• UPC: 024721000248

Standard Information

• Brand: IRWIN
• Manufacturer Part Number: 373118BX