Engineered CBN Cutting Tools for Hardened Steel & Superalloys
HyperCBN designs and manufactures high-performance CBN cutting tools — turning inserts, grooving tools and milling cutters — built to hold tolerance, resist wear, and cut hard-turning cycle times without sacrificing surface finish.
- Eliminates grinding steps with true hard turning on parts up to 65 HRC
- Consistent tool life on continuous and interrupted cuts
- Tighter tolerances and better surface finish, cut after cut
- Grades matched to your material, feed rate and machine setup
The Second-Hardest Cutting Material on Earth
CBN cutting tools are precision inserts made from Cubic Boron Nitride — a synthetic super-abrasive second in hardness only to diamond. Unlike diamond, CBN stays chemically stable at high temperatures and does not react with ferrous metals, which is exactly why it has become the standard choice for machining hardened steels, cast irons, powder-metal components, and nickel-based superalloys.
At HyperCBN, every CBN cutting tool we produce is built around one goal: replacing slow, multi-step grinding operations with a single, precise hard-turning pass. Our tooling range covers turning inserts, parting and grooving tools, and CBN milling/end mill solutions — each engineered for a specific combination of material hardness, cutting speed and surface-finish requirement.
Manufacturers choose CBN cutting tools when carbide wears too fast and grinding takes too long. A correctly selected CBN insert can machine parts hardened to 45–65 HRC at cutting speeds most conventional tooling can't sustain, while holding tolerances tight enough to remove secondary finishing operations entirely.
What Makes Our CBN Cutting Tools Different
Every insert is engineered, tested and graded before it reaches your machine shop.
Superior Wear Resistance
Ultra-hard CBN edges hold their geometry through long production runs, reducing insert changeovers and unplanned downtime.
High-Speed Capability
Rated for cutting speeds of roughly 100–400 m/min depending on grade and material, letting you run hard-turning cycles faster than grinding.
Thermal Stability
CBN cutting tools stay chemically stable at high cutting-zone temperatures, so edge integrity doesn't break down under heat.
Grade Customization
Insert shapes, grades and edge preparations tailored to your workpiece hardness, feed rate and interrupted/continuous cut profile.
Grinding Elimination
A single hard-turning pass with the right CBN insert can replace multiple grinding operations — cutting cycle time and cost.
Consistent Surface Finish
Predictable, repeatable finishes batch after batch, meeting tight tolerance callouts without secondary polishing.
CBN Cutting Tools For Every Hard-Machining Operation
Three focused product lines, each built to master a different stage of the cutting process.
CBN Turning Tools
Hard-turning inserts engineered to machine hardened steel and cast iron components directly on the lathe, removing the need for a separate grinding operation.
Explore Turning Tools →Parting / Grooving Inserts
Precision grooving and parting inserts built for clean, chatter-free cuts on hardened materials where edge stability matters most.
Explore Parting/Grooving →CBN Milling / End Mill
PCBN milling solutions for hardened dies, molds and tool steel, delivering consistent tool life across demanding milling cycles.
Explore Milling/End Mill →Industries Running On Our CBN Cutting Tools
From automotive drivelines to aerospace landing gear, our inserts are built for the industries that can't afford tool failure.
Automotive
Camshafts, gear hubs, brake disks & drums
Aerospace
Landing gear, turbine shafts
Energy
Bearing races, valve components
Die / Mold
Hardened tool steel molds
Mining
Wear parts, slurry pumps
Why Shops Are Moving From Carbide & Grinding to CBN Cutting Tools
Carbide inserts wear quickly on hardened materials, and grinding adds time, cost and an extra handling step to your process. CBN cutting tools close that gap by combining the hardness needed for hard materials with the flexibility of a standard turning or milling operation.
- ✓Machines materials up to 65 HRC that carbide simply can't hold up against
- ✓Cuts cycle time by replacing multi-step grinding with one turning pass
- ✓Lower total cost per part once grinding, fixturing and floor space are factored in
- ✓Handles both continuous and interrupted cuts with the right grade selection
- ✓Reduces the number of machines and setups needed per component
Not Sure Which CBN Grade Fits Your Application?
Talk to our tooling engineers — we'll match a CBN cutting tool to your material, machine and tolerance requirements.
CBN Cutting Tools — Frequently Asked Questions
What are CBN cutting tools used for?
CBN cutting tools are used to machine high-hardness materials such as hardened steel, cast iron, powder-metal parts and superalloys. They're common in automotive, aerospace, die/mold, energy and mining applications where standard carbide tooling wears too quickly.
Can CBN cutting tools replace grinding?
Yes. CBN cutting tools enable "hard turning" — machining hardened components directly on a lathe or mill — which eliminates the need for a separate, time-consuming grinding step in many applications.
How do I select the right CBN grade?
Grade selection depends on the hardness of the material being cut and the cutting conditions — continuous versus interrupted cuts. Our team helps match the correct CBN grade and insert geometry to your specific job.
What is the optimum cutting speed for CBN inserts?
Optimum speed depends on the material and insert specification, but CBN cutting tools are generally suited to high cutting speeds — typically in the range of 100 to 400 meters per minute.
What's the difference between CBN and carbide cutting tools?
Carbide tools wear rapidly on hardened materials above roughly 45 HRC, while CBN cutting tools hold their edge well beyond that range. CBN also runs at higher sustained cutting speeds, making it the better choice for hard-turning applications.
Which industries rely on CBN cutting tools the most?
Automotive manufacturing, aerospace, die and mold making, heavy industry, energy and mining are the primary users of CBN cutting tools, largely because these industries machine hardened components as standard practice.
Do CBN cutting tools work on interrupted cuts?
Yes, with the correct grade and edge preparation. Tougher CBN grades are specifically formulated to withstand the shock loading of interrupted cuts without chipping.