The CMT 551-089X Bi-Metal Plus Hole Saw delivers a 3-1/2" (89mm) cutting diameter built for demanding metalworking and fabrication tasks. Constructed from bi-metal 8% cobalt (BIM) material, this hole saw is engineered for cutting through stainless steel, steel, cast iron, aluminum, copper, brass, and plastics with extended tool life. The right-hand rotation design and hexagonal shank interface make it a reliable choice for cordless drills, corded drills, and drill presses where clean, precise hole cutting is required. Whether you are a contractor cutting conduit openings or a fabricator punching holes in sheet metal, the CMT 551-089X provides the performance and durability to get the job done.

Key Features

• Bi-Metal 8% Cobalt (BIM) Construction - the 8% cobalt content in the bi-metal teeth provides 2x longer cutting life compared to standard hole saws, reducing replacement frequency and cost over time.
• 3-1/2" (89mm) Cutting Diameter - a full 3-1/2 inch opening accommodates large-diameter holes in steel, cast iron, and non-ferrous metals, eliminating the need for multiple passes or secondary enlarging steps.
• 45mm Cutting Depth - the 45mm depth of cut allows the saw to pass through thick stock, structural sections, and stacked materials without bottoming out mid-cut.
• Hexagonal Shank Interface - the hexagonal shank provides a positive, slip-resistant connection to compatible arbors, maintaining concentricity and reducing vibration during high-torque cutting operations.
• Right-Hand Rotation - the right-hand cutting direction matches the standard rotation of drills and drill presses, so no special setup or reverse-rotation tooling is needed.
• XTREME FAST Push and Lock System - tool-free hole saw changes in seconds via the Push and Lock arbor system, keeping downtime to a minimum on multi-size jobs.

Why This Product

• The 8% cobalt bi-metal construction makes this hole saw a practical choice for cutting hardened or abrasive materials like stainless steel and cast iron, where standard bi-metal saws wear out prematurely.
• At 3-1/2" (89mm), this size covers a wide range of common hole-cutting tasks in electrical, plumbing, HVAC, and metalworking applications without requiring specialty tooling.
• The 45mm cutting depth gives the tool enough reach for thick-wall pipe, box sections, and multi-layer assemblies, reducing the number of setups required on a job.
• The Push and Lock arbor system eliminates tool changes between hole saw swaps, which is a meaningful time saver on production runs or multi-size drilling sequences.

Specifications

• Manufacturer Part Number: 551-089X
• Brand: CMT Orange Tools
• Diameter: 3-1/2" (89mm)
• Cutting Depth: 45mm
• Blade Material: Bi-Metal (BIM) 8% Cobalt
• Rotation: Right-Hand (RH)
• Shank: Hexagonal
• Arbor System: XTREME FAST Push and Lock - compatible with 550-PH85 (11/32" hex) and 550-PH11 (7/16" hex) arbors
• Tooth Pitch: Variable 4-6 TPI (alternate and side-set)
• 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