Sungari Whetstone for Edge Pro - Gritomatic

Sungari Whetstone for Edge Pro

For Hapstone and Edge Pro knife sharpeners (Edge Pro format)

$21.20 USD 📊 Grit Chart

Sungari Stones are used for finish or pre-finish sharpening on Hapstone and Edge Pro sharpeners. Sungari stones are available in 6 mm thickness, and are mounted on high quality aluminum blanks.

Sungari is mined in the Sungari river in China. Sungari is natural slate.

Sungari stones are universal, and can be used to sharpen knives of any steel.


  • Product size: 160 x 25 x 9 mm (6" x 1" x ⅓")
  • Working surface: 150 x 25 x 6 mm (6" x 1" x ¼")
  • Weight: 100 g (3.5 oz)
  • Estimated grit: 4000-5000 JIS
  • Sungari can be many different colors. May have slight natural imperfections and a color pattern; this is not a defect. Sungari stones usually have color stripes which look like cracks; this is not cracks.

How to use

Sungari stone is preliminary lapped and does not require lapping after purchase.

Agate sharpening stones should be used with honing oil or water as lubricant. The stone does not absorb oil or water. When using honing oil, put a small amount (1-2 drops) on the stone’s surface and spread it evenly over the stone with a finger. Remove the used lubricant with a paper towel.


This stone is quite hard and leaves a fairly polished surface, it makes a small amount of slurry, but nothing like most J-nats or Japanese synthetic water stones. The results on stainless steel are very good, the polish is slightly frosted as opposed to shiny, but the edge produced is exceptional.
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About Gritomatic

Gritomatic is not just an online shop. This private brand is a collection of high-quality, custom-made sharpening products. Gritomatic offers natural and synthetic stones, empty blanks and leather.

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Grit chart

Courtesy of Mr. Wizard. Please read chart explanation in README.