Tri Stone Knife Sharpener: Three Sided Sharpening Systems Explained

Buy one tri stone knife sharpener and you get three grits for life. That is the common pitch behind these kits. Rotate the base, pick a stone, sharpen forever.

The reality is narrower. A tri stone kit bolts three stones to one base for convenience. It does not solve grit choice, or oil versus water, or a shaky angle on its own.

This guide breaks down how these kits actually work. It covers where the three big names differ, and when a flat stone beats the rotating base.

What Actually Matters With a Tri Stone Knife Sharpener

A tri stone knife sharpener mounts three separate stones on a rotating triangle or pivot base. You flip the block to bring a new grit face up. No loose stones to store on a shelf.

Grit progression is the first thing to check. Most kits step from a coarse stone for repair, through a medium stone for shaping, to a fine stone for polish. Not every knife needs all three stages, so matching grit stages to the knives you own comes first.

Oil versus water is the second thing. Oil stones need honing oil and rarely need soaking.

Water stones need a soak before use and a quick rinse after. They tend to cut faster for the same grit number.

Stone size is the limiting factor most buyers miss. These kits usually run six inches long. That is short for a chef knife but fine for pocket knives and hunting blades.

An angle guide is often included. It earns its keep for anyone still learning to hold a consistent bevel. Once your hand knows the angle, most sharpeners set it aside and work freehand.

How the Three Big Names Differ

Smith’s sells a synthetic version with a 300 grit stone, an 800 grit stone, and a 1000 grit Arkansas stone. The stones mount on a molded plastic triangle you rotate by hand. The manufacturer lists an included angle guide and a small bottle of honing solution.

Smith’s also makes a diamond version, with a 325 grit diamond plate, a 750 grit diamond plate, and a natural Arkansas stone for finishing. Owner reports on the standard Arkansas version repeat one pattern. The polished edge is genuinely nice, but the Arkansas stone cuts slowly and needs frequent cleaning.

Wusthof takes a different approach. Their tri stone kit uses water stones rated J240, J1000, and J3000 in Japanese grit numbers. The stones sit in a wooden base with a groove, and the manufacturer specifies soaking before use.

Norton’s IM313 leans oil stone and shop grade. It is built from silicon carbide and India stone material in a longer format than the Smith’s or Wusthof kits. It reads as the pick for anyone sharpening tools and knives on the same bench.

The tradeoff shared by all three is the base itself. A rotating pivot is convenient, but it locks you into the stone length the maker chose. A fixed flat stone never has that limit.

What to Skip

Skip a tri stone kit if your longest blade is a chef knife over eight inches. The stone runs out before the stroke does, and you end up sharpening in awkward sections.

Skip the cheapest bundled honing oil. A dedicated stone honing oil, or plain mineral oil, keeps an oil stone cutting longer than an unlabeled solution.

Skip buying a tri stone system purely to save shelf space. A tri hone sharpening system can cost about as much as three loose stones of the same grits. The rotating base also fixes you to short stones, which loose stones do not.

Better Alternatives to a Fixed Tri Stone Base

For most home cooks, a two sided stone works better. Pair it with a separate holder built for longer blades. You get full stroke length and can still swap stones freely.

Getting the Angle Right Without a Guide

Most tri stone kits include a plastic angle guide clipped to the spine of the blade. It is a training wheel, not a permanent fixture.

If you drop the guide and sharpen freehand, working out the right target angle for your blade first keeps you from guessing at the bevel. Pair that with practicing the actual stroke on a flat bench stone and the angle guide stops being necessary within a few sessions.

Grit numbers also shift between brands, since Wusthof uses Japanese JIS numbering and Smith’s and Norton use standard numbers. Checking those numbers against each other before comparing stones avoids assuming a J1000 water stone cuts the same as a plain 1000 grit oil stone.

Bottom Line on Tri Stone Sharpening Kits

Is a tri stone knife sharpener good for beginners?

Yes, mainly because of the included angle guide. The tradeoff is a short stone that struggles with full size chef knives.

Do tri stone systems use oil or water?

It depends on the brand. Smith’s and Norton lean oil stone, while Wusthof’s version is a water stone that needs soaking before use.

Can I use a tri stone kit on a chef knife?

You can, but the six inch stones common to these kits force short, choppy strokes on an eight inch blade. A full length stone works better for large kitchen knives.

How often should I flatten the stones on a rotating base?

Check flatness whenever the edge stops feeling even across the blade. Coarse stones wear fastest and need flattening more often than fine finishing stones.

Are diamond tri stone kits worth the extra cost?

They cut faster and need no soaking. Owners of the Arkansas stone versions repeatedly call those stones slow, which is the main case for the diamond version. The tradeoff is a higher price for a similar grit range.

What is the difference between a tri stone kit and buying three loose stones?

A tri stone kit fixes the stones on one rotating base for convenience. Three loose stones let you pick a full length stone for each grit and swap any one of them later.