Hole saw M.K. Morse Advanced Bi‑Metal 65 mm (2-9/16") – bi-metal cutting cup, model MORSE-PTA-MHS41

Bi-metal hole saw M.K. Morse Advanced Bi‑Metal, 65 mm (2-9/16") diameter, model MORSE-PTA-MHS41 is a cutting cup designed for drilling precise circular openings in a variety of construction and installation materials. Constructed from bi‑metal, the cutting cup features hardened teeth welded to a flexible high-speed steel backing to combine tooth wear resistance with body toughness. The geometry of the cutting edge and the 65 mm diameter make this hole saw suitable for trades and maintenance tasks that require clean, accurate holes and improved life under higher-temperature conditions.

Advantages

The bi-metal construction provides a balance of edge hardness and shank flexibility, reducing tooth breakage while maintaining cutting performance. The saw is engineered for good heat resistance and wear characteristics during repeated use, extending service life compared with standard carbon steel cups. The 65 mm diameter offers a common size for pipe entries, conduit and fixture installation, and the saw is compatible with standard hole saw arbors for quick attachment to most drill types.

Suitable for

• Cutting circular holes in thin-to-medium gauge steel and non-ferrous metals
• Making openings in wood, plywood and laminated boards
• Installing electrical conduit, plumbing fixtures or ventilation penetrations
• Maintenance and repair tasks requiring repeatable, accurate hole diameters

Key specifications

• Diameter: 65 mm (2-9/16")
• Material: bi‑metal cutting edge on flexible high-speed steel body
• Cutting style: circular hole saw (cutting cup) with serrated teeth
• Compatibility: fits standard hole saw arbors for use with drills
• Intended thickness range: suitable for thin to medium material thicknesses commonly encountered in metalwork and woodworking

How to use

Fit the hole saw to a compatible arbor and secure it to a drill rated for the load. Mark the center point of the required hole and, if possible, use a pilot bit or guide to stabilize the saw during initial engagement. Start drilling at low speed to establish the cut, then increase speed within the drill manufacturer’s recommendations while applying steady, even pressure. Clear chips frequently to avoid overheating and ensure consistent cutting. When finishing the cut, slow the drill and back out the saw carefully to remove the cut plug.

Usage recommendations

Use cutting fluid or a coolant when cutting ferrous metals to reduce heat and extend tooth life. Match drill speed and feed pressure to the material: lower speeds for metals, higher speeds for wood. Inspect teeth before each use and replace the cup if teeth are damaged or excessively worn. Ensure the arbor and drill chuck are properly tightened to prevent wobble and achieve accurate holes.