What Is the Nakago? 茎 — The Japanese Sword Tang

The nakago (茎) is the tang of a Japanese sword — the unpolished, unsharpened portion of the blade that extends into the handle and is never meant to be seen when the sword is mounted. It is the single most important part of a nihonto for identification, because it carries the smith's signature (mei), the file marks, the peg hole, and — most tellingly — the natural rust and patina that only genuine age can produce. To a collector, the polished blade is the art, but the nakago is the evidence.

For anyone buying an antique Japanese sword, the nakago is where the truth lives. Everything that can be faked on the shiny blade above can be cross-checked against the tang below, and a tang that has been cleaned, re-patinated, or re-signed is one of the loudest alarm bells in the whole field.

Reading the nakago

A trained eye reads several features on the tang at once:

  • Sabi (錆) — the patina. Genuine tang rust is a deep, stable, blackish-brown that took centuries to form and adheres like skin. Freshly filed or artificially blackened tangs look flat, powdery, or wrong in color — a classic sign of trouble.
  • Yasurime (鑢目) — the file marks. The pattern the smith filed into the tang surface (kesho, sujikai, higaki, and others) is deliberate and school-specific, and it is read as part of authentication.
  • Mekugi-ana (目釘穴) — the peg hole(s). The hole for the bamboo pin that fixes the blade in its handle. Extra or plugged holes hint at remounting or shortening.
  • Nakago-jiri (茎尻) — the tang end. Its shape (kurijiri, ha-agari, kiri, and others) is another school and era indicator.

Suriage: when the tang has been shortened

Many old blades were shortened over the centuries to suit changing fashions or a new owner's height — a process called suriage (磨上げ), or o-suriage when heavily cut down. Shortening removes length from the tang, and if the signature sat in the removed portion the sword becomes mumei (無銘, unsigned). This is completely normal on genuinely old koto blades and does not make a sword fake — but it changes how the nakago is read and how the sword is attributed, usually through kantei rather than a surviving signature.

Why the nakago is the collector's proof of authenticity

The nakago is where the mei (銘), the swordsmith's signature, is chiseled, and reading that signature is the starting point of any attribution — our Mei Reader helps decode the kanji character by character. But the signature never stands alone: it must agree with the patina, the file marks, the tang shape, and the workmanship of the blade above. A crisp new-looking signature on an old, deeply patinated tang, or a mei whose chisel strokes cut through fresh rust, exposes a gimei (偽銘, false signature).

Because tang inscriptions can also record cutting tests (tameshigiri) and dedications, the nakago sometimes carries a sword's entire documented history. Never clean, file, or oil a tang: the patina is the fingerprint, and destroying it destroys both value and provenance. When in doubt, cross-reference the signature against our Swordsmith and Mei Index.

Frequently asked questions

What is the nakago of a Japanese sword?

The nakago is the tang — the unpolished part of the blade that extends into the handle and is hidden when the sword is mounted. It holds the signature, file marks, and peg hole, and its patina is the primary evidence a collector uses to authenticate and date a sword.

Should I clean the rust off a sword tang?

No. The dark rust and patina on a nakago take centuries to form and are essential evidence of age and authenticity. Cleaning, filing, or oiling the tang destroys this patina and can wipe out much of the sword's value and provenance — the tang should always be left untouched.

What does suriage mean and does it lower value?

Suriage means the blade was shortened, usually by cutting down the tang, which is common on old koto swords. It can remove the original signature and leave the blade mumei (unsigned), but by itself it does not make a sword fake, and a fine shortened blade can still be very valuable.

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