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Hapstone stones have a standard size for machine sharpening 152x25x6mm and are designed to work with Hapstone, Edge Pro Apex, Profile and similar sharpeners. The bars are made of ceramic-bonded aluminum oxide abrasive grain, so they can work with both water and oil. The general recommendation from the manufacturer is the use of water-soluble coolants. The stones are marked in the Japanese JIS grit system (120, 240, 600, 1000, 2500), unlike a similar set of silicon carbide from the same manufacturer. Roughing stones with a grit of 120 and 240 have an alloying of the abrasive grain of aluminum oxide with chromium compounds, which adds fragility to the grain and aggressiveness of the cut for the bar, and also gives the stone a characteristic pink color. Due to the peculiarities of the abrasive and bond used, the stones are universal in terms of processing various materials, i.e. excellent for all steels.

Hapstone bars show the best results when working with hard steels above 60 HRC, especially high-alloyed (quick cut, vanadium alloyed) and powder steels.

Hapstone bars hold their shape well, hold coolant well (does not need to add water or oil too often). In the process of work, it is not heavily salted, salting is easily removed by hand under running water. The speed of the bars is quite high, although somewhat lower than that of Norton India stones or Boride T2.

The maintenance and storage regulations for Hapstone stones are the same as those applied to other ceramic bond sharpening stones. Alignment of Hapstone stones is made on glass on silicon carbide powder, it is better to store bars in wooden boxes.


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