Product Description
The CMT 551-027X Bi-Metal Plus Hole Saw delivers professional-grade hole cutting at 1-1/16 in. (27mm) diameter, purpose-built for contractors and tradespeople who need reliable performance in demanding materials. Engineered with an 8% Cobalt bi-metal construction, this 27mm hole saw cuts through stainless steel, steel, cast iron, aluminum, copper, brass, and plastics with significantly extended cutting life compared to standard bi-metal saws. The XTREME FAST Push and Lock system makes swapping hole saws fast and tool-free, keeping your workflow moving without interruptions.
Key Features
- Bi-Metal 8% Cobalt (BIM) Construction - the elevated cobalt content hardens the cutting teeth for 2x longer cutting life than standard hole saws, making this tool a cost-effective choice for high-volume or heavy-duty drilling tasks in tough materials like stainless steel and hardened steel.
- 1-1/16 in. (27mm) Cutting Diameter - a precise, consistent bore diameter suited for conduit knock-outs, pipe penetrations, and hardware installations that require exact hole sizing.
- 45mm Cutting Depth - the generous cutting depth allows the saw to pass through thicker substrates, walls, and stacked materials in a single pass, reducing repositioning and saving time on site.
- XTREME FAST Push and Lock System - changes hole saws in under 3 seconds with no tools required, reducing downtime between cuts and improving efficiency when switching between multiple bore sizes.
- Variable Pitch Teeth (4-6 TPI) with Alternate and Side-Set Geometry - the variable tooth pitch reduces vibration and heat buildup during cutting, extending tooth life and producing cleaner, more accurate holes across a wide range of materials.
- Right-Hand (RH) Rotation - standard right-hand rotation is compatible with cordless drills, corded drills, and drill presses, so no special spindle configuration is needed.
- Hexagonal Shank Interface - the hex shank design seats securely in the Push and Lock arbor, preventing slippage under torque and maintaining concentricity for accurate cuts.
- Compatible with 550-PH85 and 550-PH11 Push and Lock Arbors - works with both 11/32 in. hex and 7/16 in. hex arbors, giving users flexibility across different drill configurations without purchasing additional adapters.
Why This Product
- Built for tough metals including stainless steel and cast iron - the 8% Cobalt bi-metal construction goes beyond what standard bi-metal hole saws can handle, making this a practical choice for HVAC, electrical, plumbing, and metalworking applications where harder materials are encountered regularly.
- The Push and Lock system removes a common jobsite frustration - traditional hole saw arbors require hex keys or wrenches to swap saws, but the XTREME FAST system lets you change sizes in under 3 seconds with bare hands, keeping productivity high when multiple hole sizes are needed in sequence.
- 45mm cutting depth handles real-world material thicknesses - whether drilling through metal enclosures, stacked panels, or thick-wall conduit bodies, the 45mm depth means fewer partial cuts and less need for secondary operations to complete a through-hole.
- Broad material compatibility in a single saw - one saw covers stainless steel, steel, cast iron, aluminum, copper, brass, and plastics, reducing the number of specialty tools a technician or installer needs to carry to a job.
Specifications
- Manufacturer Part Number: 551-027X
- Brand: CMT Orange Tools
- Diameter: 1-1/16 in. (27mm)
- 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
Frequently Asked Questions
What arbors are compatible with the CMT 551-027X hole saw?
The 551-027X is designed for use with CMT Push and Lock arbors - specifically the 550-PH85 (11/32 in. hex shank) and the 550-PH11 (7/16 in. hex shank). Both arbors support the XTREME FAST Push and Lock interface for tool-free saw changes.
Can this hole saw cut stainless steel?
Yes. The 8% Cobalt bi-metal construction is specifically engineered to handle stainless steel and hardened steel, along with steel, cast iron, aluminum, copper, brass, and plastics. The elevated cobalt content in the teeth provides the hardness and heat resistance needed for these demanding materials.
What is the maximum cutting depth of this hole saw?
The CMT 551-027X has a cutting depth of 45mm, which allows it to cut through thicker materials and multi-layer assemblies in a single operation without needing to flip the workpiece or reposition the tool.
What does the variable 4-6 TPI tooth pitch mean for cutting performance?
Variable pitch teeth - alternating between 4 and 6 teeth per inch with alternate and side-set geometry - reduce vibration and heat during the cut. This results in smoother cutting action, longer tooth life, and cleaner holes across a broad range of materials compared to fixed-pitch designs.
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