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CBN sharpening stones for modern high-hardness steels, combining aggressive Start CBN stones and smoother Premium CBN stones.
Abrasive
Hapstone CBN sharpening stones are made from cubic boron nitride, also known as elbor.
Premium bond
Hapstone Premium CBN stones use a metal-organic bond with wear resistance close to metal bonds and smoother sharpening.
Start series
Hapstone Start Series electroplated CBN stones are designed for aggressive material removal and fast reprofiling.
Grit progression
Recommended set
The set combines Hapstone Start CBN stones for coarse sharpening with Hapstone Premium CBN stones for smoother controlled sharpening stages.
This progression includes 100, 220, 400, 800, and 1500 grit stones.
For final polishing, Hapstone recommends using Hapstone Poly Diamond Suspension in 6, 3, and 1 µm.
Benefits
CBN stones are durable yet smooth in operation. They are often compared to Japanese water stones but are significantly more durable.
CBN stones do not require soaking or special preparation and can be used without cutting fluids.
CBN crystals have an octahedral structure with multiple cutting edges, which allows efficient sharpening while minimizing deep scratches.
All stones share the same size, allowing grit progression without adjusting the sharpening angle.
Performance
Excellent sharpening efficiency is achieved thanks to 100% concentration of CBN1 abrasive grain.
Specifications
