The CMT 551-114X Bi-Metal Plus Hole Saw delivers a full 4-1/2 inch (114mm) cutting diameter for demanding metal fabrication, plumbing, electrical, and HVAC applications. Built from 8% Cobalt bi-metal (BIM) construction, this professional-grade hole saw cuts through stainless steel, mild steel, cast iron, aluminum, copper, brass, and plastics with significantly extended tool life compared to standard bi-metal designs. The Push and Lock arbor system keeps job-site changeovers fast and tool-free, making it a practical choice for contractors and tradespersons who need reliable, repeatable performance from a 114mm hole saw.

Key Features

• 8% Cobalt Bi-Metal (BIM) Construction - the elevated cobalt content in the tooth material provides 2x longer cutting life than standard hole saws, reducing replacement frequency and downtime on heavy metal cutting tasks.
• 4-1/2 inch (114mm) Cutting Diameter - sized for large-diameter penetrations through steel panels, cast iron, aluminum sheet, and plastic enclosures, covering a wide range of mechanical and electrical trade applications.
• 45mm Cutting Depth - sufficient depth capacity to cut through thick-walled steel pipe, conduit fittings, junction box knockouts, and structural panel materials without needing a second pass.
• Variable 4-6 TPI Tooth Pitch with Alternate and Side-Set Teeth - the variable pitch reduces harmonic vibration during cutting, while alternate and side-set geometry clears chips efficiently and produces a cleaner hole edge across different metal thicknesses.
• XTREME FAST Push and Lock System - compatible with 550-PH85 (11/32 inch hex) and 550-PH11 (7/16 inch hex) Push and Lock arbors, enabling hole saw changes in under 3 seconds without any tools, keeping the work moving.
• Right-Hand (RH) Rotation - matches the standard forward rotation of corded drills, cordless drills, and drill presses, so the saw installs and runs correctly in the most common drilling platforms without any configuration changes.
• Hexagonal Shank Interface - the hex shank design locks securely into the Push and Lock arbor, preventing slippage under high-torque cutting loads that are common when cutting stainless steel or cast iron.
• Made in Italy - manufactured to CMT's European production standards, reflecting the precision tolerances and consistent quality expected from professional tooling.

Why This Product

• Contractors cutting through stainless steel or hardened steel - where standard bi-metal hole saws wear out quickly - get a measurably longer service life from the 8% Cobalt BIM tooth construction, reducing cost-per-hole on demanding jobs.
• The 4-1/2 inch (114mm) diameter fills a specific need in HVAC, plumbing, and electrical work where large-diameter penetrations through metal panels or pipe flanges are required - a size that smaller hole saws cannot cover.
• The XTREME FAST Push and Lock system eliminates the time lost to hex key removal and re-mounting when swapping between hole saw sizes on a multi-opening job, which adds up meaningfully across a full work day.
• Compatibility with both 11/32 inch and 7/16 inch hex Push and Lock arbors means this hole saw integrates directly into an existing CMT Series 550 arbor setup without purchasing additional adapters.

Specifications

• Manufacturer Part Number: 551-114X
• Brand: CMT Orange Tools
• Diameter: 4-1/2 in. (114mm)
• 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