The CMT 551-051X Bi-Metal Plus Hole Saw delivers professional-grade hole cutting in a 2" (51mm) diameter format, engineered for demanding applications in metal fabrication, electrical work, plumbing, and HVAC installation. Built with an 8% Cobalt bi-metal (BIM) construction, this hole saw is purpose-built to tackle stainless steel, hardened steel, cast iron, aluminum, copper, brass, and a wide range of plastics - giving tradespeople and fabricators a single versatile cutter that handles tough materials without frequent blade changes. The XTREME FAST Push and Lock system lets you swap hole saws in seconds, keeping your workflow moving on the job site or in the shop.

Key Features

• 8% Cobalt Bi-Metal (BIM) Construction - the high cobalt content in the tooth material significantly extends cutting life compared to standard hole saws, meaning fewer blade changes and lower cost per hole when working through hard metals like stainless steel and cast iron.
• 2" (51mm) Cutting Diameter - a commonly specified size for electrical knockouts, pipe pass-throughs, and conduit openings, eliminating the need for secondary enlargement or filing to reach target dimensions.
• 45mm Cutting Depth - deep enough to cut through thick structural materials, stacked panels, and heavy-wall tubing in a single pass, reducing repositioning and saving time on multi-material setups.
• XTREME FAST Push and Lock System - tool-free hole saw changes in under 3 seconds keep downtime to a minimum when switching between sizes during a job, and the secure lock prevents the saw from loosening under load.
• Variable 4-6 TPI Alternate and Side-Set Teeth - the variable pitch reduces vibration and chatter during cutting, producing cleaner entry holes and extending tooth life across a broad range of material thicknesses.
• Right-Hand (RH) Rotation - compatible with standard right-hand drill rotation, making this hole saw ready to use with any conventional corded drill, cordless drill, or drill press without adapter modifications.
• Hexagonal Shank - the hex shank interface provides a positive, slip-free connection to the arbor, maintaining concentricity and reducing runout for accurate, on-center holes every time.
• Made in Italy - manufactured to CMT precision standards with consistent quality control, providing reliable performance across the full production run.

Why This Product

• Cuts materials that defeat standard hole saws - the 8% Cobalt bi-metal construction is specifically formulated for stainless steel, cast iron, and hardened steel, materials that rapidly dull conventional bi-metal saws without cobalt reinforcement, making this the right choice for metal fabrication and industrial maintenance work.
• One hole saw, many materials - the combination of variable-pitch teeth and BIM construction means a single 2" cutter handles steel, aluminum, copper, brass, cast iron, and plastics without swapping to application-specific saws, simplifying tool kit management for multi-trade contractors.
• System compatibility for fast production work - the XTREME FAST Push and Lock arbor system is designed for repeated, rapid saw changes, making this hole saw well-suited to production environments where multiple sizes are used in sequence and downtime for tool changes is costly.
• 45mm cutting depth handles real-world material stacks - with nearly 1 3/4" of usable depth, this saw reaches through thick panels, structural members, and deep-socket applications that shallower hole saws cannot complete in a single pass.

Specifications

• Manufacturer Part Number: 551-051X
• Brand: CMT Orange Tools
• Diameter: 2" (51mm)
• 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" hex) and 550-PH11 (7/16" 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 drill
• Use with corded drill
• Use with drill press