Hole Saw Irwin 10504181 bi-metal 44 mm, variable tooth pitch 4.5/5.5 TPI

Irwin 10504181 bi-metal hole saw, 44 mm diameter, is designed for cutting precise circular openings in metal and a range of other materials. The bi-metal construction pairs high-speed steel teeth with a flexible steel backing to balance cutting performance and toughness. A variable tooth pitch of 4.5/5.5 TPI helps the saw cut efficiently across different material thicknesses while reducing vibration and improving chip evacuation.

Advantages

The bi-metal design provides a durable cutting edge resistant to heat and wear, extending tool life compared with standard carbon-steel hole saws. Variable tooth pitch enhances cutting speed and reduces the risk of tooth loading when working with both thin and thicker materials. The 44 mm diameter suits common hole sizes required for fittings and conduit, and the saw is compatible with standard drill drivers and hole saw arbors for straightforward mounting and removal.

Suitable for

• Cutting circular holes in sheet metal and steel panels
• Installing electrical boxes, conduits and cable glands
• Plumbing and HVAC penetrations in thin metal surfaces
• General workshop and on-site trade work with drill drivers

Key specifications

• Diameter: 44 mm
• Material: bi-metal (high-speed steel teeth bonded to flexible steel body)
• Tooth pitch: variable 4.5 / 5.5 TPI
• Cutting type: circular hole cutting for metal and mixed materials
• Compatibility: fits standard drill drivers and hole saw arbors

How to use

Secure the hole saw to a compatible arbor and mount it in a drill driver rated for the application. Mark the centre of the hole and use a pilot bit if present to stabilise the saw before cutting. Start drilling at low speed to establish the cut, then increase speed as required, applying steady, moderate pressure. Use cutting lubricant or coolant when cutting ferrous metals to reduce heat and extend blade life. After completing the cut, clear chips from the saw and inspect the edge for wear before reuse.

Usage recommendations

For best results when cutting metal, use appropriate cutting fluid, maintain consistent feed rate, and avoid excessive side loads. Replace the saw if teeth become damaged or if cutting performance declines significantly.