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Ha-No-Kuromaku stones are the workhorses of many woodshops. Precisely graded sharpening media are bonded to create a stone that is durable yet fast cutting.
The purple 30,000x is the finest stone in the Ha-No-Kuromaku line and yields the finest of razor edges for tools, straight razors and knives. Shapton recommends blades be prepared on the 8000x stone before final polishing on the 30,000x.
It measures 210mm × 70mm × 15mm (8 1/4" × 2 3/4" × 5/8") and is supplied in a color-matched live-hinge plastic storage case that also serves as a stand. Four urethane feet on the vented case bottom give a good grip, while molded ribs on the case lid hold the stone in place. Both sides of the stone are usable.
The stone can be used with the Shapton stone holder, field holder and pond. It can also be used as an oil stone, but then must continue to be used with oil only. Weighs just shy of 20 oz (550g).
| Sharpening Stage | Grit Range (µ) | Micron (µ) | Kuromaku | Range Code |
| Shaping 30.1–150 |  | 122.5 | 120 | 1 |
| 30.1–150 | 66.82 | 220 | ||
| Â | 45.94 | 320 | ||
| Grinding 10.1–30 | 20.1–30 | 29.4 |  | 2A |
| Â | 25 | Â | ||
| 15.1–20 | 20 |  | 2B | |
| 10.1–15 | 14.7 | 1000 | 2C | |
| Â | 11.5 | Â | ||
| Honing 3.01–10 | 8.01-10 | 9.8 | 1500 | 3A |
| 6.01 | 7.35 | 2000 | 3B | |
| Â | 6.7 | Â | ||
| 3.01-6 | 4.9 | Â | 3C | |
| Â | 4 | Â | ||
| Â | 3.68 | Â | ||
| Polishing 0.25-3 | 1.51-3 | 3 | Â | 4A |
| Â | 2.94 | 5000 | ||
| Â | 2.45 | Â | ||
| Â | 2 | Â | ||
| Â | 1.84 | 8000 | ||
| 0.76-1.5 | 1.47 | Â | 4B | |
| Â | 1.2 | Â | ||
| Â | 1 | 12000 | ||
| Â | 0.92 | Â | ||
| Â | 0.85 | Â | ||
| 0.25-0.75 | 0.49 | 30000 | 4C | |
| Â | 0.44 | Â |
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Shapton 30,000x Purple Ha-No-Kuromaku Ceramic Stone
Ha-No-Kuromaku stones are the workhorses of many woodshops. Precisely graded sharpening media are bonded to create a stone that is durable yet fast cutting.
The purple 30,000x is the finest stone in the Ha-No-Kuromaku line and yields the finest of razor edges for tools, straight razors and knives. Shapton recommends blades be prepared on the 8000x stone before final polishing on the 30,000x.
It measures 210mm × 70mm × 15mm (8 1/4" × 2 3/4" × 5/8") and is supplied in a color-matched live-hinge plastic storage case that also serves as a stand. Four urethane feet on the vented case bottom give a good grip, while molded ribs on the case lid hold the stone in place. Both sides of the stone are usable.
The stone can be used with the Shapton stone holder, field holder and pond. It can also be used as an oil stone, but then must continue to be used with oil only. Weighs just shy of 20 oz (550g).
| Sharpening Stage | Grit Range (µ) | Micron (µ) | Kuromaku | Range Code |
| Shaping 30.1–150 |  | 122.5 | 120 | 1 |
| 30.1–150 | 66.82 | 220 | ||
| Â | 45.94 | 320 | ||
| Grinding 10.1–30 | 20.1–30 | 29.4 |  | 2A |
| Â | 25 | Â | ||
| 15.1–20 | 20 |  | 2B | |
| 10.1–15 | 14.7 | 1000 | 2C | |
| Â | 11.5 | Â | ||
| Honing 3.01–10 | 8.01-10 | 9.8 | 1500 | 3A |
| 6.01 | 7.35 | 2000 | 3B | |
| Â | 6.7 | Â | ||
| 3.01-6 | 4.9 | Â | 3C | |
| Â | 4 | Â | ||
| Â | 3.68 | Â | ||
| Polishing 0.25-3 | 1.51-3 | 3 | Â | 4A |
| Â | 2.94 | 5000 | ||
| Â | 2.45 | Â | ||
| Â | 2 | Â | ||
| Â | 1.84 | 8000 | ||
| 0.76-1.5 | 1.47 | Â | 4B | |
| Â | 1.2 | Â | ||
| Â | 1 | 12000 | ||
| Â | 0.92 | Â | ||
| Â | 0.85 | Â | ||
| 0.25-0.75 | 0.49 | 30000 | 4C | |
| Â | 0.44 | Â |
