The CMT 551-019X Bi-Metal Plus Hole Saw is a 3/4" (19mm) diameter bi-metal cutting tool engineered for demanding hole-cutting tasks in steel, stainless steel, cast iron, aluminum, copper, brass, and plastics. Built with an 8% Cobalt bi-metal (BIM) construction, this hole saw delivers twice the cutting life of standard bi-metal hole saws, making it a dependable choice for professionals who need consistent results in tough materials. The 45mm cutting depth and right-hand rotation combine to handle a wide range of metal-cutting and plastic-cutting applications with precision and durability.

Key Features

• 8% Cobalt Bi-Metal (BIM) Construction - the elevated cobalt content in the tooth material delivers 2x longer cutting life compared to standard hole saws, reducing tool changes and downtime on the job.
• 3/4" (19mm) Cutting Diameter - a precise, consistent bore size suitable for conduit knockouts, pipe fittings, and hardware installations requiring an accurate 3/4 in. hole.
• 45mm Cutting Depth - deeper-than-average stroke capacity allows the saw to power through thicker material sections and stacked workpieces without sacrificing control.
• Right-Hand Rotation - optimized for standard drills and drill presses, ensuring immediate compatibility with common corded and cordless drilling equipment.
• XTREME FAST Push and Lock System - change hole saws in under 3 seconds with a simple push and no tools required, keeping workflow moving on multi-size jobs.
• Variable Pitch Teeth (4-6 TPI) with Alternate and Side-Set - the variable tooth geometry reduces vibration, minimizes heat buildup, and produces cleaner cuts across a broad range of materials from plastics to hardened steel.
• Broad Material Compatibility - cuts stainless steel, steel, cast iron, aluminum, copper, brass, and plastics from a single tool, reducing the need to stock multiple specialized saws.
• Made in Italy - precision manufacturing to tight tolerances, supporting consistent cut quality across the full product lifespan.

Why This Product

• The 8% Cobalt bi-metal formula makes this hole saw a practical upgrade for tradespeople who regularly cut stainless steel or hardened steel - materials that wear out standard hole saws quickly - extending service life and lowering cost per hole over time.
• The 3/4 in. (19mm) size paired with a 45mm cutting depth covers a critical range of electrical, plumbing, and HVAC hole-cutting tasks where both diameter accuracy and sufficient depth are required in a single pass.
• The XTREME FAST Push and Lock arbor system eliminates the frustration of threading and wrenching between saw changes, a direct productivity advantage when working through multiple hole sizes on the same project.
• Compatibility with both 11/32 in. hex and 7/16 in. hex Push and Lock arbors (550-PH85 and 550-PH11) means this saw integrates cleanly into an existing CMT Series 551X system without requiring additional adapters.

Specifications

• Manufacturer Part Number: 551-019X
• Brand: CMT Orange Tools
• Diameter: 3/4" (19mm)
• 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
• Compatible with cordless drills, corded drills, and drill presses