Hole Saw M.K. Morse Advanced Bi-Metal 43 mm (1-11/16") MORSE-PTA-MHS27

The M.K. Morse Advanced Bi-Metal hole saw, 43 mm (1-11/16"), is a bi-metal cutting cup designed for producing clean, accurate circular holes in metal and other materials compatible with bi-metal blades. Constructed from high-speed steel teeth welded to a flexible steel body, this hole saw combines cutting durability with resistance to chipping and premature wear. It is intended for use with compatible mandrels and standard drills to perform tasks in plumbing, electrical, HVAC and general metalworking.

Advantages

The hardened bi-metal construction provides improved edge retention and extended service life compared with standard stamped hole saws. The design balances rigidity and flexibility to reduce tooth breakage and maintain a smooth cutting action. Its 43 mm diameter delivers a precise hole size suitable for common pipe and fitting installations. The product is compatible with a range of drill speeds and can be used with standard mandrels for quick arbor changes.

Suitable for

• Cutting holes in thin to medium-gauge steel and non-ferrous metal
• Creating openings for pipes and fittings in HVAC and plumbing installations
• Cutting access holes for electrical conduit and junction boxes
• General metalworking tasks where a clean circular cut is required

Key specifications

• Cutting diameter: 43 mm (1-11/16")
• Material: bi-metal construction (high-speed steel teeth welded to steel body)
• Cut type: through-hole, circular
• Compatibility: designed for use with standard drill mandrels and drills
• Typical applications: metal, non-ferrous materials, thin sheetwork

How to use

Secure a compatible mandrel in the hole saw and tighten according to the mandrel manufacturer's instructions. Mark the center of the hole to be cut and use a pilot drill if required for accurate positioning. Mount the assembled hole saw in a drill, select an appropriate speed for the material being cut, and apply steady, even pressure while keeping the tool perpendicular to the workpiece. Withdraw periodically to clear chips and, when cutting metal, use suitable cutting fluid to reduce heat and extend cutting life. After cutting, remove the slug and inspect the teeth for wear before subsequent use.

Usage recommendations

Use moderate drill speeds for steel and higher speeds for softer materials; apply cutting fluid for metal work and allow the tool to cool between cuts. Replace the hole saw if significant tooth wear or chipping is observed to maintain cut quality and operator safety.