Understanding Sharpening Stone Grit: From Coarse to Ultra-Fine

If you have spent any time researching knife sharpening, you have encountered bewildering numbers: 220 grit, 1000 grit, 6000 grit, 30,000 grit. What do these numbers actually mean? How do you know which grit to use and in what order? This guide explains grit progression from the ground up, helping you choose the right stones and use them in the correct sequence.

## What Is Grit?

Grit refers to the size of the abrasive particles in a sharpening stone. A lower grit number means larger particles that remove material aggressively but leave a rough surface. A higher grit number means smaller particles that remove material slowly but leave a smooth, polished surface.

Think of grit like sandpaper: 60-grit sandpaper tears through material but leaves a rough surface. 600-grit sandpaper removes material slowly but leaves a smooth finish. The same principle applies to sharpening stones, but the scale extends much further — up to 30,000 grit and beyond for ultra-fine polishing stones.

## The Grit Scale

Sharpening grits can be divided into clear functional categories:

### Extra Coarse: 80-220 Grit

**Purpose:** Repair, reprofiling, and heavy material removal.
**Use cases:** Fixing chips in the blade edge, changing the primary bevel angle, thinning behind the edge, repairing broken tips, and removing significant rust or pitting.

At the 80-grit level, you are removing steel aggressively. The scratches are deep and visible. An edge finished at 220 grit will be extremely toothy — it will grab and tear rather than slice cleanly. This is acceptable for axes, machetes, and garden tools where ultimate sharpness is less important than fast cutting, but it is not a finished edge for knives.

**When to reach for an extra-coarse stone:** Your knife has visible chips in the edge, the edge angle needs to be changed (e.g., from 25 degrees to 17 degrees), or the knife is so dull that a medium stone would take impractically long to form a burr.

### Coarse: 300-500 Grit

**Purpose:** Establishing the edge and removing damage.
**Use cases:** Sharpening very dull knives that cannot form a burr on a medium stone, removing small chips and rolling without heavy material removal, establishing a new edge angle quickly, and thinning behind the edge on large blades.

A 400-grit stone is the first grit that produces a functional knife edge. The edge will be toothy and aggressive — excellent for cutting fibrous materials like rope, cardboard, and meat with skin. Many outdoor and work knives are deliberately finished in the 300-400 grit range because the toothy edge provides superior bite on tough materials.

**When to reach for a coarse stone:** Your knife is noticeably dull and a medium stone is taking too long, small chips need to be removed, or you want a toothy working edge for tough materials.

### Medium: 800-1200 Grit

**Purpose:** Standard sharpening and edge refinement.
**Use cases:** This is the starting point for most sharpening sessions. An 800-1200 grit stone sharpens a moderately dull knife to a very functional edge within a reasonable time. This is the most-used grit range for regular maintenance sharpening.

An edge finished at 1000 grit is the sweet spot for most kitchen and EDC use. It is sharp enough to slice paper cleanly, push-cut through vegetable skins, and handle all everyday cutting tasks. The edge has enough tooth for cutting tomatoes and peppers but enough refinement for clean onion dicing.

**When to reach for a medium stone:** This is your default stone for routine sharpening. Any knife that still has a discernible edge but is no longer performing well starts here. Pair with a coarse stone for dull knives and a fine stone for finishing if you want extra refinement.

Many sharpeners use a single 1000-grit stone as their only stone — it is that versatile.

### Fine: 2000-4000 Grit

**Purpose:** Edge refinement and polishing.
**Use cases:** Refining the edge after the medium stone for improved cutting performance on soft materials, creating a more durable edge (finer scratches reduce stress concentration points), and preparing the edge for ultra-fine polishing.

An edge finished at 3000 grit is noticeably sharper than one finished at 1000 grit. It push-cuts through paper effortlessly, glides through soft vegetables, and provides a smoother cutting experience. For kitchen knives used primarily for vegetables and boneless proteins, a 3000-grit finish is an excellent balance of sharpness and practicality.

For pocket knives that cut fibrous materials like cardboard and rope, a 3000-grit edge may feel too smooth — it lacks the bite that a coarser edge provides. Consider your primary cutting materials when choosing your finishing grit.

**When to reach for a fine stone:** After the medium stone when you want improved push-cutting performance and a smoother edge. For kitchen knives used for precise vegetable work, a fine stone finish is ideal.

### Extra Fine: 5000-8000 Grit

**Purpose:** Polishing and edge refinement.
**Use cases:** Creating an extremely refined edge for specialized applications, polishing bevels to a near-mirror finish, and edge refinement for sashimi knives and other specialized Japanese blades.

At 6000-8000 grit, the edge is entering the realm of high polish. The cutting feel is extremely smooth — almost frictionless through soft materials. For a yanagiba (sashimi knife), this level of refinement is standard because the goal is to slice raw fish without tearing the delicate protein structure.

For general kitchen and EDC use, edges in this range are arguably beyond the point of practical benefit. The edge is extremely sharp but may lack tooth for everyday cutting tasks. The time investment for this level of refinement is significant, and the edge performance gain over 3000 grit is marginal for most users.

**When to reach for an extra-fine stone:** Specialized Japanese kitchen knives, straight razors, or when the goal is a polished edge for aesthetic reasons.

### Ultra-Fine / Polishing: 10,000-30,000+ Grit

**Purpose:** Mirror polishing and extreme refinement.
**Use cases:** Creating perfectly mirrored bevels, the final step for straight razors, competition sharpness demonstrations, and aesthetic refinement.

Beyond 10,000 grit, you are no longer improving cutting performance — you are polishing for appearance and the satisfaction of the craft. A mirror-polished bevel is undeniably beautiful, but a 3000-grit edge cuts just as effectively in practical terms.

These grits are primarily the domain of straight razor honing, where the edge must be perfectly smooth for comfortable shaving, and knife enthusiasts who enjoy the meditative process of creating flawless mirrored bevels.

## Understanding Grit Ratings Across Different Standards

Grit ratings are not universal. Different manufacturers and standards measure grit differently, and the same number can represent very different abrasive sizes.

### JIS (Japanese Industrial Standard)

The JIS system is the most commonly referenced standard for water stones. JIS grits are relatively consistent across Japanese manufacturers. A Shapton 1000, Naniwa 1000, and King 1000 are roughly comparable, though there are differences in binder hardness and cutting characteristics that affect the effective finish.

### FEPA-F (European Standard)

The FEPA-F standard is used for many European and American abrasives. FEPA-F grits are numerically different from JIS — for example, FEPA-F 1000 is roughly equivalent to JIS 600. This can cause confusion when comparing stones from different manufacturers.

### Micron Ratings

The most objective measure of abrasive size is the micron rating — the actual average particle diameter in micrometers. This eliminates the ambiguity of different grit standards:

| Grit (JIS approximate) | Micron Size |
|————————|————-|
| 220 | 60-70 microns |
| 400 | 35-40 microns |
| 1000 | 14-16 microns |
| 3000 | 4-5 microns |
| 6000 | 2-3 microns |
| 10000 | 0.8-1.2 microns |
| 30000 | 0.3-0.5 microns |

When comparing stones from different manufacturers, look for micron ratings rather than grit numbers when possible.

### Diamond Stone Grit

Diamond stones from DMT use their own mesh system. A DMT Coarse (45 micron) cuts similarly to a JIS 400-600 grit water stone. A DMT Fine (25 micron) is similar to JIS 700-800. A DMT Extra Fine (9 micron) is similar to JIS 1500-2000. The cutting action of diamond is more aggressive, so the actual finish may appear slightly coarser than a water stone of the equivalent grit.

## How to Build a Grit Progression

### The Minimalist Progression (2 stones)

– **Coarse/Fine combination diamond stone (325/1200):** Handles everything from edge repair to finishing. The 325 side for dull knives and edge setting, the 1200 side for finishing. One stone, all steels, no maintenance.

– **Medium/Fine water stone (1000/6000):** The classic combination. The 1000 side for standard sharpening, the 6000 side for polishing. Add a diamond flattening plate.

### The Standard Progression (3 stones)

– **Coarse (320-400):** For dull knives and edge repair
– **Medium (800-1200):** For standard sharpening
– **Fine (3000-6000):** For finishing and polishing

This three-stone progression handles every sharpening need for kitchen and EDC knives. Start on the medium stone for knives that are moderately dull. Drop to the coarse stone only when the medium stone cannot raise a burr within a reasonable time. Finish on the fine stone for improved edge quality.

### The Enthusiast Progression (4-5 stones)

– Extra Coarse (120-220): For heavy repair and reprofiling
– Coarse (320-400): For edge setting
– Medium (800-1200): For sharpening
– Fine (3000-5000): For refinement
– Extra Fine (8000+): For polish (optional)

This full progression provides a stone for every situation and the ability to create whatever edge finish you prefer. The extra-coarse and extra-fine stones will see infrequent use but are invaluable when needed.

## Practical Grit Selection by Knife Type

### Western Kitchen Knives (56-58 HRC)

– **Standard sharpening:** Start at 800-1000 grit
– **Finishing grit:** 1000-3000 grit
– **Maintenance:** Ceramic honing rod at 1000-2000 grit equivalent
– **Do not bother with:** Grits above 4000 — diminishing returns on softer steel

### Japanese Kitchen Knives (60-65 HRC)

– **Standard sharpening:** Start at 1000 grit
– **Finishing grit:** 3000-6000 grit (general use), 6000-8000+ (sashimi knives)
– **Maintenance:** Leather strop or fine ceramic rod
– **Note:** The harder steel takes and holds a finer edge than Western knives

### EDC Pocket Knives (various steels)

– **8Cr13MoV, AUS-8, 14C28N:** Finish at 600-1000 grit for a toothy working edge
– **D2, VG-10, 154CM:** Finish at 800-2000 grit for a balanced edge
– **S30V, S35VN, M390:** Finish at 1000-3000 grit — these steels hold a fine edge well
– **Carbon steel traditionals:** Finish at 600-1000 grit — carbon steel takes a coarse edge beautifully

### Outdoor and Hard-Use Knives

– **Finishing grit:** 300-600 grit for a toothy edge
– **Reason:** Coarse edges excel at cutting fibrous materials, grip better on tough surfaces, and are faster to touch up in the field
– **Do not bother with:** Grits above 1000 — the fine edge dulls quickly on tough materials

## The Myth of Higher is Better

The most persistent myth in sharpening is that higher grit equals sharper equals better. In reality:

1. A properly executed edge at 600 grit is sharper than a poorly executed edge at 6000 grit. Technique matters more than grit.

2. The ideal finishing grit depends on what you cut. A 400-grit edge cuts rope and cardboard better than a 6000-grit edge because the micro-serrations from coarser grit provide more bite.

3. Beyond approximately 3000 grit, practical cutting performance gains become marginal for most applications. Further refinement is about aesthetics and the craft, not functional improvement.

4. A mirror-polished edge looks impressive but the polish is on the bevel — the actual apex is a single point regardless of how polished the bevel behind it is.

The most useful approach to grit is pragmatic: choose the coarsest grit that still provides the cutting experience you want. This minimizes sharpening time and maximizes edge longevity.

## Conclusion

Understanding grit progression transforms sharpening from guesswork into a deliberate process. You know which stone to reach for based on the condition of the edge. You know when to stop — when the grit is fine enough for your intended use, not when you have used every stone in your collection. And you understand that the best edge is not always the highest-grit edge, but the one best suited to your cutting tasks.

Start your grit progression journey: [Sharpening Stone Sets](https://www.amazon.com/s?k=sharpening+stone+set+grit&tag=bladeowl-20)

For a complete sharpening setup: [Knife Sharpening Kits](https://www.amazon.com/s?k=knife+sharpening+kit+complete+whetstone&tag=bladeowl-20)