What Is a Hammered (Tsuchime) Santoku Finish
The dimpled surface on a hammered santoku is called tsuchime — literally "hammer marks" in Japanese. It began as an honest byproduct of hand-forging and survived because the dimples do so...
The dimpled surface on a hammered santoku is called tsuchime — literally "hammer marks" in Japanese. It began as an honest byproduct of hand-forging and survived because the dimples do something useful: they help food release from the blade.
In brief
Tsuchime dimples create air pockets between blade and food, reducing the suction that makes cucumber slices cling. Functional on wet vegetables, cosmetic on meat. Sharpening is unaffected — the finish sits above the edge bevel.
Where the finish comes from
In traditional forging, the smith's hammer leaves overlapping facets on the blade face. Polishing them out costs hours, so working knives kept them — and the pattern became a mark of hand work. On a hand-forged hammered santoku, no two blades carry the same pattern; that's the forge, not a mold.
What the dimples actually do
Wet, starchy slices — cucumber, potato, zucchini — cling to a flat blade by suction. The tsuchime facets trap air and break the seal, so slices fall away instead of riding up the steel. The effect is real but modest: it reduces sticking, it doesn't eliminate it. Kullenschliff (granton) hollows on Western knives chase the same physics.
What it doesn't change
The finish lives on the upper blade face, above the edge bevel, so sharpening and honing work exactly as on a smooth blade — the routine in how often to hone applies unchanged. Cutting performance still comes from geometry and steel; the santoku shape itself is covered in Japanese knife shapes and santoku vs chef's knife.
Hammered beyond the santoku
The same finish appears on larger blades — the 8-inch hammered stainless chef knife carries tsuchime on a Western profile, for cooks who want the release effect with a rocking cut.
Choosing one
If the knife is a gift, the pattern does half the presentation work — the santoku gift box pairs the blade with packaging that matches it (and is a santoku a good gift? answers the obvious question). For your own board, pick by what you cut: mostly vegetables, the santoku earns the slot — see santoku vs nakiri for the vegetable-heavy edge case.
Shop the full edit: Master Series knives at Wudy Kitchen.
