In modern machining, efficiency, cost-effectiveness, and precision are key factors in selecting the right cutting tools. While Indexable High Speed Drills have become widely adopted for small to medium-sized holes, there has been a gap in the market for a large-diameter drilling solution with the same advantages.
That's where the Indexable Core-Stay Drill comes in—a next-generation drilling tool designed specifically for large-diameter hole machining (45mm and above). It combines the efficiency of indexable cutting tools with the ability to handle heavy-duty applications, making it a superior alternative to annular cutters and other conventional drilling methods.
In this article, we'll explore what an Indexable Core-Stay Drill is, how it compares to other drilling tools, and why manufacturers should consider making the switch.
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What Is an Indexable Core-Stay Drill?

An Indexable Core-Stay Drill is a large-diameter drilling tool that features replaceable carbide inserts, just like an Indexable High Speed Drill. Unlike traditional solid drills or annular cutters that require full tool replacement when worn, only the inserts need to be changed, making it a cost-efficient and time-saving solution for industrial machining.
This drill is designed to remove a cylindrical core while drilling, rather than completely cutting away the entire material within the hole. This reduces cutting force and improves tool life, making it ideal for applications that require deep and large-diameter hole machining in materials such as steel, aluminum, and cast iron.
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How Does It Compare to Other Drilling Solutions?

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Key Benefits of Using an Indexable Core-Stay Drill

1. Lower Tooling Costs

•     Just like Indexable High Speed Drills, only the inserts need to be replaced, drastically reducing tooling costs compared to solid drills and annular cutters.
•     The drill body has a longer lifespan, leading to fewer tool replacements over time.

2. Increased Machining Efficiency

•     The ability to remove a core instead of cutting away all material reduces cutting force, leading to faster machining speeds.
•     Minimized tool wear allows for extended use, reducing production interruptions.

3. Large-Diameter Hole Capabilities

•     Designed specifically for 45mm and larger hole sizes, an Indexable Core-Stay Drill fills the gap where Indexable High Speed Drills are no longer effective.
•     Ideal for heavy-duty industries such as automotive, aerospace, construction, and industrial machinery.

4. Less Material Waste & Better Chip Evacuation

•     Since it leaves a core instead of turning all material into chips, it minimizes waste and makes chip evacuation easier and more efficient.
•     Reduces overheating and extends tool life, leading to more consistent performance.

5. More Sustainable & Environmentally Friendly

•     By generating less waste and reducing the need for full tool replacements, an Indexable Core-Stay Drill aligns with modern sustainability goals.

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Where Can Indexable Core-Stay Drills Be Used?

This tool is particularly valuable in industries where large-diameter drilling is a routine process:

•  Metalworking & Fabrication – Ideal for structural steel and heavy metal components.
•  Aerospace & Automotive – Used for drilling precision holes in engine and body components.
•  Construction & Infrastructure – Suitable for drilling in beams, pipes, and other large metal structures.
•  Oil & Gas Industry – Efficient for drilling in pipelines, pressure vessels, and other high-strength materials.

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Why Manufacturers Are Switching to Indexable Core-Stay Drills

Many manufacturers who already use Indexable High Speed Drills for smaller holes are now adopting Indexable Core-Stay Drills to bring the same efficiency to larger hole machining. The benefits of replaceable inserts, lower costs, and faster machining make it a smart choice for businesses looking to optimize productivity.
If you're currently using annular cutters and experiencing high tooling costs and frequent tool replacements, it’s time to upgrade to an Indexable Core-Stay Drill for better efficiency and long-term savings.
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Conclusion

The Indexable Core-Stay Drill represents the next step in large-diameter drilling technology, offering the same advantages as Indexable High Speed Drills, but for holes larger than 45mm. Its cost savings, efficiency, and sustainability make it the superior choice over annular cutters and solid drills.

At SHANG TZANG WANG ENTERPRISE CO., LTD., we manufacture both Indexable High Speed Drills and Indexable Core-Stay Drills, providing high-performance drilling solutions for a wide range of industrial applications.
Want to learn more about how our indexable drilling solutions can improve your machining process? Contact us today!