Product Description
The CMT 551-127X Bi-Metal Plus Hole Saw delivers a 5" (127mm) cutting diameter engineered for demanding metal fabrication, plumbing, electrical, and HVAC applications. Built with an 8% Cobalt bi-metal (BIM) construction, this hole saw bores clean, accurate holes through stainless steel, steel, cast iron, aluminum, copper, brass, and plastics - giving tradespeople and fabricators a single tool that handles a wide range of tough materials. The right-hand rotation and 45mm cutting depth make it well suited for both cordless drills and drill presses where consistent, repeatable performance matters.
Key Features
- 8% Cobalt Bi-Metal (BIM) Construction - the elevated cobalt content in the tooth alloy delivers significantly extended cutting life compared to standard bi-metal hole saws, reducing downtime and replacement frequency on demanding metal cutting jobs.
- 5" (127mm) Cutting Diameter - a large-format hole size ideal for conduit knockouts, pipe penetrations, and structural openings where precision sizing is critical.
- 45mm Cutting Depth - deep enough to cut through thick-wall materials, stacked panels, and structural members in a single pass, eliminating the need for secondary operations.
- Right-Hand (RH) Rotation - compatible with standard drill chucks and drill press spindles, ensuring straightforward setup without specialized tooling.
- Hexagonal Shank Design - the hexagonal shank interface provides a secure, slip-resistant connection to the arbor, maintaining concentricity and reducing wobble during aggressive metal cutting.
- Broad Material Compatibility - cuts stainless steel, steel, cast iron, aluminum, copper, brass, and plastics, making this a versatile choice across multiple trade disciplines and reducing the need to carry multiple hole saws.
Why This Product
- The 8% Cobalt bi-metal tooth construction addresses one of the most common frustrations in metal hole cutting - premature tooth wear on stainless steel and hardened steel - by delivering a measurably tougher cutting edge that stays sharp longer.
- At 5" (127mm), this hole saw targets a diameter commonly required for large conduit runs, pipe sleeves, and HVAC ducting penetrations, making it a practical everyday tool for electricians, plumbers, and sheet metal workers.
- The 45mm cutting depth accommodates thicker workpieces than shallow-cut alternatives, reducing the need to flip material or make multiple passes on deeper sections.
- Right-hand rotation and a hexagonal shank mean this saw pairs directly with standard drill setups, keeping the learning curve low and getting users cutting quickly without adapters or unusual tooling requirements.
Specifications
- Manufacturer Part Number: 551-127X
- Brand: CMT Orange Tools
- Diameter: 5" (127mm)
- Cutting Depth: 45mm
- Blade Material: Bi-Metal (BIM) 8% Cobalt
- Rotation: Right-Hand (RH)
- Shank: Hexagonal
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
Frequently Asked Questions
What materials can the CMT 551-127X cut through?
This hole saw is designed to cut stainless steel, steel, cast iron, aluminum, copper, brass, and plastics. The 8% Cobalt bi-metal construction gives it the hardness needed to handle tough ferrous and non-ferrous metals without rapid tooth degradation.
What is the maximum cutting depth of this hole saw?
The CMT 551-127X has a cutting depth of 45mm, which accommodates thicker workpieces and structural materials that shallower hole saws cannot reach in a single pass.
What type of shank does this hole saw use?
It uses a hexagonal shank, which provides a secure, slip-resistant fit in compatible arbors and helps maintain concentricity during high-load metal cutting operations.
What machines are compatible with this hole saw?
The CMT 551-127X is compatible with cordless drills, corded drills, and drill presses. Its right-hand rotation matches standard drill chuck and spindle configurations, making it straightforward to integrate into common shop and field setups.
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FAQs
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