The CMT 551-040X Bi-Metal Plus Hole Saw delivers a 1-9/16 in. (40mm) cutting diameter built for professionals who need reliable, repeatable performance across a wide range of metal and non-metal materials. Engineered with an 8% Cobalt bi-metal construction, this hole saw provides 2x longer cutting life than standard bi-metal hole saws - making it a smart upgrade for tradespeople cutting stainless steel, steel, cast iron, aluminum, copper, brass, and plastics on a regular basis. The XTREME FAST Push and Lock system means you spend less time changing accessories and more time working, with tool-free saw swaps completed in under 3 seconds. Whether you are drilling through structural steel on a job site or cutting precise holes in copper pipe fittings in a shop environment, this CMT hole saw is built to handle the load.

Key Features

• 8% Cobalt Bi-Metal (BIM) Construction - the elevated cobalt content delivers 2x longer cutting life compared to standard hole saws, reducing replacement frequency and cost when cutting hard metals like stainless steel and hardened steel
• XTREME FAST Push and Lock System - enables tool-free hole saw changes in under 3 seconds, dramatically reducing downtime during multi-hole or multi-saw drilling tasks
• Variable Pitch Teeth at 4-6 TPI with Alternate and Side-Set - reduces vibration and chatter during cutting, producing cleaner holes and extending tooth life across a variety of material thicknesses
• 1-9/16 in. (40mm) Cutting Diameter - a commonly specified hole size for conduit, pipe, and fixture installations, giving electricians, plumbers, and metalworkers a precise fit right out of the box
• 45mm Cutting Depth - accommodates deeper cuts through thick structural members, pipe walls, and stacked materials without requiring multiple passes
• Right-Hand (RH) Rotation - compatible with standard drill chucks and drill press spindles, requiring no special tooling or adapters beyond the designated Push and Lock arbors
• Compatible with 550-PH85 and 550-PH11 Push and Lock Arbors - works with both 11/32 in. hex and 7/16 in. hex arbor options, giving users flexibility across cordless drills, corded drills, and drill presses
• Made in Italy - precision-manufactured to tight tolerances, ensuring consistent hole quality and dimensional accuracy on every cut

Why This Product

• If you regularly cut stainless steel or hardened steel, the 8% Cobalt bi-metal construction provides twice the tool life of standard hole saws - meaning fewer saw changes and lower cost per hole over time
• The XTREME FAST Push and Lock system is purpose-built for high-volume drilling work where stopping to wrench-swap hole saws slows production - tool-free changes in under 3 seconds keep jobs moving
• At 40mm diameter and 45mm cutting depth, this hole saw handles a wide range of common trade applications - from conduit knockouts and pipe penetrations to cast iron and aluminum fabrication work - without requiring a specialty saw for each material type
• With compatibility across cordless drills, corded drills, and drill presses, this hole saw integrates into the equipment you already own, provided you use a compatible 550-PH85 or 550-PH11 Push and Lock arbor

Specifications

• Manufacturer Part Number: 551-040X
• Brand: CMT Orange Tools
• Diameter: 1-9/16 in. (40mm)
• Cutting Depth: 45mm
• Blade Material: Bi-Metal (BIM) 8% Cobalt
• Tooth Pitch: Variable 4-6 TPI (alternate and side-set)
• Rotation: Right-Hand (RH)
• Shank: Hexagonal
• System: XTREME FAST Push and Lock
• Arbor Compatibility: 550-PH85 (11/32 in. hex) and 550-PH11 (7/16 in. hex) Push and Lock arbors
• Country of Origin: Made in Italy

Approved Applications

• Hole cutting in steel and stainless steel
• Hole cutting in cast iron
• Hole cutting in aluminum and non-ferrous metals
• Hole cutting in copper and brass
• Hole cutting in plastics