The CMT 551-076X Bi-Metal Plus Hole Saw delivers professional-grade cutting performance in a 3" (76mm) diameter format, built for tradespeople who need reliable, fast results when cutting through steel, stainless steel, cast iron, aluminum, copper, brass, and plastics. Engineered with 8% Cobalt bi-metal (BIM) construction, this hole saw is designed to outlast standard bi-metal blades, making it a smart choice for demanding metalworking, electrical, and plumbing applications where downtime is not an option.

Key Features

• Bi-Metal 8% Cobalt (BIM) Construction - the elevated cobalt content in the teeth significantly extends cutting life compared to standard bi-metal hole saws, so you get more cuts per blade and lower cost per hole on tough materials like stainless steel and hardened steel.
• 3" (76mm) Cutting Diameter - creates precise, clean openings sized for conduit knockouts, pipe pass-throughs, and other standard trade applications, eliminating the need for secondary sizing or cleanup work.
• 45mm Cutting Depth - provides sufficient depth capacity to cut through typical wall thicknesses, sheet metal assemblies, and structural members in a single pass without repositioning.
• Right-Hand (RH) Rotation - compatible with standard drill and drill press spindle direction, meaning no special setup or reversed tooling is required - just chuck up and cut.
• Hexagonal Shank Design - the hex shank interface resists slipping under torque load, giving you a more secure drive connection and better energy transfer from the drill to the cutting edge.
• XTREME FAST Push and Lock System - swap hole saws in under 3 seconds without tools, dramatically reducing changeover time on multi-size jobs and keeping productivity high on the jobsite.
• Variable 4-6 TPI Tooth Pitch with Alternate and Side-Set Geometry - the variable pitch reduces vibration and chatter during cutting while the tooth set clears chips efficiently, resulting in smoother holes and reduced heat buildup.
• Made in Italy - produced under CMT's manufacturing standards for consistent quality and dimensional accuracy across the series.

Why This Product

• When you need to cut through stainless steel or cast iron without burning through blades, the 8% Cobalt bi-metal construction provides the heat and wear resistance to handle those demanding materials, saving money on replacement tooling over time.
• The Push and Lock arbor system means you can move between hole saw sizes on a multi-knockout job without reaching for a wrench - a genuine time saver when working through a panel board or electrical enclosure with multiple hole sizes.
• At 3" (76mm), this is a commonly specified size for conduit, pipe, and cable trough applications, so it covers a wide range of everyday trade tasks without requiring a specialty tool.
• The hexagonal shank and BIM construction together make this hole saw equally capable in a cordless drill, corded drill, or drill press - giving you flexibility to use whatever tool is at hand without compromising cut quality.

Specifications

• Manufacturer Part Number: 551-076X
• Brand: CMT Orange Tools
• Diameter: 3" (76mm)
• 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: 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