Product Description
The CMT 551-140X Bi-Metal Plus Hole Saw - 5-1/2" (140mm) is an 8% Cobalt bi-metal cutting tool engineered for demanding hole-cutting tasks in metal, plastic, and other tough materials. Built with BIM8%CO construction, this 5-1/2 inch hole saw delivers significantly longer cutting life than standard bi-metal saws, making it a dependable choice for contractors, fabricators, and tradespeople who need consistent, clean results when drilling through steel, stainless steel, cast iron, aluminum, copper, brass, and plastics. The right-hand rotation design and hexagonal shank interface work together to provide secure chuck engagement and stable cutting action in both corded and cordless drill applications.
Key Features
- Bi-Metal 8% Cobalt (BIM8%CO) Construction - the elevated cobalt content in the cutting teeth delivers extended tool life compared to standard bi-metal hole saws, reducing replacement frequency and cost on high-volume or heavy-duty drilling jobs.
- 5-1/2" (140mm) Cutting Diameter - sized for large-bore applications such as pipe penetrations, conduit pass-throughs, and panel cutouts where a precise, full-sized opening is required.
- 45mm Cutting Depth - provides enough reach to cut through thick-wall materials, structural members, and stacked workpieces without needing to reposition or flip the material.
- Right-Hand Rotation - optimized for standard drill operation, ensuring proper tooth engagement and chip clearance throughout the cut for smoother results and reduced binding.
- Hexagonal Shank Interface - the hex shank design resists slipping in the chuck under high-torque conditions, maintaining consistent power transfer from the drill to the saw body during demanding cuts.
- Compatible with Multiple Material Types - cuts stainless steel, steel, cast iron, aluminum, copper and brass, and plastics, eliminating the need to swap tools when working across mixed-material assemblies or panels.
Why This Product
- For tradespeople cutting through stainless steel or hardened steel, the 8% Cobalt bi-metal teeth maintain their edge significantly longer than standard bi-metal teeth - meaning fewer interruptions and lower tooling cost per hole on demanding metalworking projects.
- The 45mm cutting depth makes this hole saw suitable for thick structural materials and heavy-gauge workpieces that shallower saws cannot reach through in a single pass.
- At 5-1/2" (140mm), this saw covers a large-diameter range commonly required for HVAC penetrations, electrical conduit routing, plumbing rough-in, and panel fabrication - a single tool that handles a broad scope of trade applications.
- The hexagonal shank and right-hand rotation pairing ensures reliable chuck grip and proper cutting geometry, reducing the risk of slippage or chatter that can damage the workpiece or the saw teeth during high-load cuts.
Specifications
- Manufacturer Part Number: 551-140X
- Brand: CMT Orange Tools
- Diameter: 5-1/2" (140mm)
- Cutting Depth: 45mm
- Blade Material: Bi-Metal (BIM) 8% Cobalt
- Shank: Hexagonal
- Rotation: Right-Hand (RH)
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 551-140X 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 makes it particularly well-suited for harder metals like stainless steel and cast iron where standard bi-metal saws wear quickly.
What is the cutting depth of this 5-1/2" hole saw?
The CMT 551-140X has a cutting depth of 45mm, which is sufficient for thick-wall pipe, structural panels, and other heavy-gauge workpieces commonly encountered in mechanical, electrical, and HVAC applications.
What type of shank does this hole saw use?
The CMT 551-140X uses a hexagonal shank. The hex shank design provides strong anti-slip engagement in the chuck, which is especially important when applying the higher torque levels needed to drive a 5-1/2" (140mm) diameter saw through dense metals.
Is this hole saw compatible with standard corded and cordless drills?
Yes. The right-hand rotation and hexagonal shank configuration are compatible with standard corded drills, cordless drills, and drill presses that accept hex-shank tooling. Always verify that your drill's chuck or arbor accepts the hexagonal shank format before use.
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