The CMT 551-029X Bi-Metal Plus Hole Saw delivers precision hole cutting in a compact 1-1/8 in. (29mm) diameter, engineered for demanding applications in metal fabrication, electrical work, and plumbing. Built with an 8% Cobalt bi-metal construction, this hole saw is designed to outlast standard bi-metal cutters while powering through stainless steel, steel, cast iron, aluminum, copper, brass, and plastics with consistent results. The Push and Lock system makes arbor changes fast and tool-free, keeping your workflow moving on the job site or in the shop.

Key Features

• Bi-Metal 8% Cobalt (BIM) Construction - the elevated cobalt content in the tooth material provides significantly longer cutting life compared to standard bi-metal hole saws, making this tool well suited for repeated cuts in tough metals including stainless steel and hardened steel.
• 1-1/8 in. (29mm) Diameter - a precise, consistent cut diameter that matches common conduit, pipe, and fitting sizes, reducing rework and ensuring clean, accurate holes in a wide range of materials.
• 45mm Cutting Depth - sufficient depth to cut through thick wall materials, structural steel members, and stacked workpieces without needing to reposition or use a secondary tool.
• XTREME FAST Push and Lock System - compatible with 550-PH85 and 550-PH11 Push and Lock arbors, this system allows hole saw swaps in seconds without wrenches or set screws, reducing downtime between differently sized cuts.
• Variable Pitch 4-6 TPI Teeth with Alternate and Side-Set Geometry - the variable tooth pitch reduces vibration and chatter, while the alternate and side-set configuration improves chip evacuation and cutting speed across metals, cast iron, and plastics.
• Right-Hand (RH) Rotation - designed for standard right-hand rotation drills, cordless drills, corded drills, and drill presses, ensuring broad compatibility with the tools already on your job site.
• Hexagonal Shank Interface - the hexagonal shank provides a secure, slip-resistant connection to compatible arbors, preventing cam-out under load and maintaining cutting accuracy throughout the cut.

Why This Product

• Professionals cutting into stainless steel or cast iron need a hole saw that holds its edge through demanding material - the 8% Cobalt bi-metal teeth are specifically formulated to handle these harder metals without premature tooth wear or burnishing.
• The 1-1/8 in. diameter is a standard size for many conduit knockouts, pipe penetrations, and panel cutouts, making this a practical go-to cutter for electricians, plumbers, and HVAC installers who need reliable, repeatable results in that size.
• The Push and Lock arbor system eliminates the need to carry wrenches for bit changes - switching to a different hole saw diameter takes seconds, a real advantage when you are cutting multiple sizes across a project.
• With a 45mm cutting depth and compatibility across steel, aluminum, non-ferrous metals, and plastics, this single hole saw covers a broad range of jobsite materials, reducing the number of specialized cutters you need to keep on hand.

Specifications

• Manufacturer Part Number: 551-029X
• Brand: CMT Orange Tools
• Diameter: 1-1/8 in. (29mm)
• 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