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Sharpening Stone Grit Chart

Our Sharpening Stone Grit Chart

We decided to come up with a grit chart based on 10 levels. Since one person's "fine" and one manufacturer's "fine" may mean something completely different we established a 1 to 10 grit chart with 1 being the most coarse and 10 being the finest. Each of the levels links to a page where we've selected stones that meet that grit range.

Level Description Particle Size Approximate Grit
1 Extremely Coarse - Fastest metal removal, leaves very visible scratches in cutting edge. 100+ Micron Under 150 Grit
2 Coarse - Very fast metal removal, leaves visible scratches in cutting edge. Most coarse stones commonly available. 60-100 Micron 150 - 220 Grit
3 Medium Coarse - Fast metal removal rate, scratches not as visible. Finest recommended grit for dull tools and knives. 45-60 Micron 220 - 300 Grit
4 Medium - Good metal removal rate, light sctaches edge. Intermediate stage before finer grits. 35-45 Micron 300 - 400 Grit
5 Medium Fine - Minimum recommended grit for final stage of most knives. Edge does not appear scratched but frosted. Finer than medium but sharpening rate slower. 25-35 Micron 400 - 600 Grit
6 Fine - Modest sharpening rate, leaves metal edge with frosted appearance. Edge sharpness equivalent to majority of factory edges on knives, tools. 15-25 600 - 1000 Grit
7 Extra Fine - Slow sharpening rate. Edge is showing a polished looking edge. Very sharp edge better than most factory edges on good knives. 8-15 Micron 1000 - 2000 Grit
8 Extremely Fine - Edge is extremely sharp. Very slow sharpening speed. Edge reflects light very well. 4-8 Micron 2000 - 6000 Grit
9 Near Mirror Polish - Edge is very near perfect. Grits past this stage provides only modest benefit. Leave edge polished to naked eye. 2-4 Micron 6000 - 10,000 Grit
10 Mirror Polish - Sharpest edge possible, extremely slowing sharpening. Leaves mirror edge without visible flaws. 0-2 Micron 10,000+ Grit