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Reliable water stones for controlled sharpening of EDC, kitchen, and outdoor knives up to 62 HRC.
Abrasive
Hapstone Optimal stones use aluminum oxide abrasive with a vitrified bond for stable sharpening performance.
Use
Designed for sharpening EDC, kitchen, and outdoor blades with steel hardness up to 62 HRC.
Result
The stones provide an even scratch pattern, low clogging, and fast, controlled steel removal.
Use and maintenance
Soak the stone for 2–3 minutes before use and spray water during sharpening when needed.
Use water only. Oil is not recommended for these stones.
The stones are easy to clean, pre-lapped, and ready to use.
Grit conversion
Use this chart to compare Hapstone Optimal FEPA grit ratings with approximate JIS and micron equivalents.
| FEPA | JIS | Microns |
|---|---|---|
| F220 | #250 | 50 µm |
| F400 | #600 | 20 µm |
| F500 | #1000 | 10 µm |
| F1000 | #3000 | 5 µm |
| F1200 | #4000 | 3 µm |
Specifications
