Product Description
The CMT 551-108X Bi-Metal Plus Hole Saw is a heavy-duty 4-1/4 in. (108mm) hole saw engineered for demanding cutting applications in metal, stainless steel, cast iron, aluminum, copper, brass, and plastics. Built with an 8% Cobalt bi-metal (BIM) construction, this tool delivers extended cutting life compared to standard hole saws - making it a reliable choice for contractors, fabricators, and tradespeople who need consistent performance across tough materials. The right-hand rotation design and hexagonal shank interface ensure a secure, stable fit in cordless drills, corded drills, and drill presses alike.
Key Features
- Bi-Metal 8% Cobalt (BIM) Construction - the high cobalt content strengthens the cutting teeth, delivering 2x longer cutting life than standard hole saws and maintaining sharpness when cutting hardened and stainless steel
- 4-1/4 in. (108mm) Cutting Diameter - sized for large-diameter hole applications in metal panels, conduit knock-outs, plumbing, and HVAC rough-in work
- 45mm Cutting Depth - provides enough depth capacity to cut through thick stock, pipe walls, and layered materials without repositioning
- Right-Hand Rotation - matches the standard rotation direction of corded and cordless drills as well as drill presses, ensuring compatibility with everyday drilling equipment
- Hexagonal Shank Interface - the hex shank design provides a positive, non-slip connection to compatible arbors, reducing vibration and improving cut accuracy
- Broad Material Compatibility - cuts stainless steel, steel, cast iron, aluminum, copper, brass, and plastics, reducing the need to swap tools when working across mixed-material jobsites
Why This Product
- The 8% Cobalt bi-metal composition makes this hole saw a practical upgrade for anyone regularly cutting stainless steel or hardened metals where standard bi-metal saws wear out quickly
- At 4-1/4 in. (108mm), this saw covers a large-diameter range that handles conduit, pipe, and panel cut-outs in a single pass - reducing setup time on the job
- The 45mm cutting depth accommodates thicker workpieces and multi-layer assemblies, giving tradespeople the versatility to tackle a wider range of cuts without changing tools
- Right-hand rotation and a hexagonal shank make this hole saw straightforward to set up with standard drill equipment, minimizing downtime and compatibility concerns on the jobsite
Specifications
- Manufacturer Part Number: 551-108X
- Brand: CMT Orange Tools
- Diameter: 4-1/4 in. (108mm)
- 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
- Use with cordless drills, corded drills, and drill presses
Frequently Asked Questions
What materials can the CMT 551-108X Bi-Metal Plus Hole Saw cut?
This hole saw is designed to cut stainless steel, steel, cast iron, aluminum, copper, brass, and plastics. The 8% Cobalt bi-metal construction is particularly effective on harder materials like stainless steel and hardened steel where standard hole saws tend to wear out faster.
What is the cutting depth of this 4-1/4 in. hole saw?
The CMT 551-108X has a cutting depth of 45mm, which provides enough capacity to work through thick panels, pipe walls, and layered assemblies without needing to reposition the tool mid-cut.
What shank type does the CMT 551-108X use, and what drills is it compatible with?
This hole saw features a hexagonal shank, which connects to compatible hex arbors. It is designed for use with cordless drills, corded drills, and drill presses that accept hex-drive arbor systems.
Why does the CMT 551-108X use 8% Cobalt in its bi-metal construction?
The 8% Cobalt content in the bi-metal (BIM) teeth significantly increases hardness and heat resistance compared to standard bi-metal formulations. This results in 2x longer cutting life, which reduces tool change frequency and lowers overall cost per cut - especially when working with stainless steel and other demanding metals.
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