The CMT 551-070X Bi-Metal Plus Hole Saw delivers professional-grade hole cutting performance in a 2-3/4 in. (70mm) diameter format, engineered for demanding applications in steel, stainless steel, cast iron, aluminum, copper, brass, and plastics. Built with 8% Cobalt bi-metal construction, this hole saw provides twice the cutting life of standard hole saws, making it a reliable choice for tradespeople and fabricators who need consistent results across ferrous and non-ferrous materials. The XTREME FAST Push and Lock system allows tool-free blade changes in under 3 seconds, reducing downtime on the job site and keeping work moving efficiently.

Key Features

• 8% Cobalt Bi-Metal (BIM) Construction - provides 2x longer cutting life compared to standard hole saws, meaning fewer blade changes and lower cost per hole on tough materials like stainless steel and hardened steel.
• 2-3/4 in. (70mm) Cutting Diameter - sized for common plumbing, electrical, and HVAC rough-in applications where a precise, clean hole is required in metal or plastic substrates.
• 45mm Cutting Depth - accommodates thicker stock and stacked materials, giving tradespeople flexibility when cutting through deeper workpieces without needing to reposition or use multiple passes.
• XTREME FAST Push and Lock System - engineered for tool-free hole saw swaps in under 3 seconds, drastically cutting transition time when working across multiple hole sizes on a single project.
• Variable 4-6 TPI Tooth Pitch with Alternate and Side-Set Geometry - reduces vibration and heat buildup during cutting, producing cleaner holes and extending tooth life across a wide range of material thicknesses.
• Right-Hand (RH) Rotation - standard orientation compatible with cordless drills, corded drills, and drill presses, making it straightforward to use with the most common power tools on the job.
• Hexagonal Shank - locks securely in drill chucks and arbors, preventing slippage under the high torque loads generated when cutting through steel and cast iron.
• Compatible with 550-PH85 and 550-PH11 Push and Lock Arbors - works with 11/32 in. hex and 7/16 in. hex Push and Lock arbors, giving professionals flexibility across drill configurations.

Why This Product

• When cutting through stainless steel or cast iron is a regular requirement, the 8% Cobalt bi-metal construction means the blade holds its edge significantly longer than standard bimetal hole saws - reducing replacement frequency and overall tooling cost.
• The XTREME FAST Push and Lock system eliminates the frustration of stuck or jammed hole saw arbors - a common issue with conventional twist-lock designs - by enabling a clean, tool-free release in under 3 seconds.
• A 45mm cutting depth in a 2-3/4 in. diameter saw covers a wide range of real-world applications, from cutting conduit entry holes in electrical panels to pipe penetrations through structural members, without needing a deeper specialty tool.
• The variable 4-6 TPI alternate and side-set tooth design handles both thin-gauge sheet metal and thicker plate in a single tool, avoiding the need to swap between fine-pitch and coarse-pitch saws for different material thicknesses.

Specifications

• Manufacturer Part Number: 551-070X
• Brand: CMT Orange Tools
• Diameter: 2-3/4 in. (70mm)
• 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
• Use with cordless drills, corded drills, and drill presses