Cubic Boron Nitride Inserts Built for Hard Turning
HyperCBN engineers Cubic Boron Nitride inserts that machine hardened steel, cast iron and superalloys at production speed — replacing costly grinding operations with a single hard-turning pass, without sacrificing surface finish or tool life.
What Are Cubic Boron Nitride Inserts?
Cubic Boron Nitride (CBN) inserts are ultra-hard cutting tools made from a synthetic super-abrasive that ranks second only to diamond in hardness. Unlike diamond, CBN is chemically stable at high temperatures and doesn't react with ferrous metals, which is exactly why it has become the go-to insert material for machining hardened steels, chilled cast iron, powder-metal alloys and nickel-based superalloys.
At HyperCBN, every Cubic Boron Nitride insert is manufactured by bonding a thin CBN tip to a tungsten-carbide substrate, then precision-grinding the cutting edge to hold tight tolerances at high cutting speeds. The result is a tool that keeps its edge through long production runs, holds dimensional accuracy on hardened parts, and consistently delivers a mirror-like surface finish that many shops use to eliminate a separate grinding step altogether.
- Machines materials 45–70 HRC without pre-softening
- Replaces grinding with a single hard-turning operation
- Stable performance at cutting speeds of 100–400 m/min
- Available in full-tip, tipped and solid CBN grades
Cubic Boron Nitride Inserts for Every Operation
From roughing to finish turning, HyperCBN's CBN insert range covers the full range of hard-part machining, engineered to match your material, geometry and cutting parameters.
CBN Turning Inserts
Full-tip and tipped Cubic Boron Nitride turning inserts for continuous and interrupted cuts on hardened steel, bearing races and gear components, engineered to hold size across long production batches.
Parting & Grooving Inserts
CBN-tipped parting and grooving tools built for clean separation and slot work on hardened materials, minimizing burr formation and edge chipping in high-hardness applications.
Milling / End Mill Inserts
PCBN milling inserts for face and profile milling of hardened tool steel and cast iron, delivering consistent tool life across interrupted-cut milling operations.
Industries That Run on Our CBN Inserts
Cubic Boron Nitride inserts from HyperCBN are trusted across industries where hardness, precision and repeatability are non-negotiable.
Automotive
Camshafts, gear hubs, brake disks, brake drums
Aerospace
Landing gear components, turbine shafts
Energy
Bearing races, valve components
Die / Mold
Hardened tool steel molds
Mining
Wear parts, slurry pump components
How to Select the Right Cubic Boron Nitride Insert
Choosing the correct cbn insert grade and geometry is the difference between a tool that pays for itself and one that chips early. Here's the process our applications team follows on every project.
Identify the Material
We start by understanding the hardness, abrasiveness and thermal conductivity of your workpiece material, since these directly determine which CBN grade and CBN content will hold up best.
Select Insert Shape & Size
Next, we choose the insert shape — square, triangle or diamond — and the size based on your application, machine setup and whether the cut is continuous or interrupted.
Conduct a Test Run
We run a live test cut, monitor wear and surface finish, and fine-tune feed rate, depth of cut and cutting speed until performance is fully optimized for your part.
Precision Redefined With Advanced CBN Inserts
Our Cubic Boron Nitride inserts are engineered for precision and durability, transforming hard-part machining processes across industries. Crafted with superior raw materials and cutting-edge bonding technology, every insert is built for high-performance, long-lasting results — with customizable geometries tailored to your specific application.
Because CBN retains its hardness well beyond the temperatures generated in hard turning, shops using our inserts routinely cut cycle time by removing a separate grinding operation, while still holding tight tolerances and a fine surface finish straight off the lathe.
| Material hardness range | 45–70 HRC |
| Recommended cutting speed | 100–400 m/min |
| Typical workpiece materials | Hardened steel, cast iron, superalloys |
| Insert construction | Full-tip / tipped / solid CBN |
| Common insert shapes | Square, triangle, diamond (ISO) |
| Primary benefit | Eliminates grinding via hard turning |
A Manufacturing Partner, Not Just a Supplier
HyperCBN is a leading innovator in Cubic Boron Nitride manufacturing, combining superior materials, advanced bonding technology and hands-on applications support to help you machine harder, faster and cleaner.
Superior Materials
Every insert starts from high-grade CBN and tungsten-carbide substrates for consistent hardness and toughness.
Customization
Grades, geometries and edge preparations tailored to your material and cutting conditions.
Global Reach
Reliable supply to automotive, aerospace, energy, die/mold and mining customers worldwide.
Sustainable Practices
Recyclable carbide substrates and efficient production processes that reduce material waste.
Talk to Our CBN Insert Specialists
Send us your material spec and part drawing — we'll recommend the right Cubic Boron Nitride insert grade and geometry for your job.
Frequently Asked Questions
Everything shops usually ask us before switching to Cubic Boron Nitride inserts.
What are Cubic Boron Nitride inserts?
Cubic Boron Nitride (CBN) inserts are ultra-hard cutting tools made from Cubic Boron Nitride, the second hardest material after diamond. They're used for machining high-hardness materials such as hardened steel, cast iron and superalloys, where conventional carbide tools wear out quickly.
Can CBN inserts replace grinding?
Yes. CBN inserts enable "hard turning" — machining parts above 45 HRC directly on a lathe — which eliminates a costly, time-consuming grinding step in many production workflows while still achieving a comparable surface finish.
How do I select the right CBN insert grade?
Match the grade to your material's hardness and to the cutting conditions — continuous versus interrupted cuts. Our applications team reviews your material and part drawing to recommend the right CBN content, geometry and edge preparation.
What are the applications of CBN inserts?
CBN inserts are used across automotive manufacturing, aerospace, mold and die manufacturing, heavy industry, the energy sector and medical device manufacturing — anywhere hardened materials need to be machined to tight tolerances.
What is the optimum cutting speed for CBN inserts?
Optimum cutting speed depends on the workpiece material and the specific insert specification, but Cubic Boron Nitride inserts are generally suited to high cutting speeds, typically in the 100–400 m/min range.
How long does a CBN insert last compared to carbide?
Because CBN retains hardness at the high temperatures generated during hard turning, it typically holds an edge far longer than carbide on hardened materials — reducing insert changeovers and improving overall production throughput.
Do you offer custom CBN insert geometries?
Yes. HyperCBN produces full-tip, tipped and solid CBN inserts in square, triangle and diamond ISO shapes, with custom sizing and edge preparation available for specific applications.