Parts of a katana explained: tsuba, saya, hamon, and the full furniture map

Museum labels and auction photos throw Japanese nouns at you like confetti. This page is the beginner catalog: what each part is called, what it does when you draw or cut, how it keeps you from slicing your hand or dropping a blade, and how styles differ: tsuba shapes, saya materials, hamon types. It pairs with the katana overview and the deeper forging map in sword anatomy. Anatomy leans into cross-sections and steel zones; here we stay with the fully dressed sword you actually see on a stand: blade labels plus the furniture that makes the weapon wearable. For how the steel is made, see sword making; for named blades that show these parts under museum glass, browse famous swords. When you are sorting wall hangers from serious mounts, replica swords is a useful sibling. The same vocabulary scales to a wakizashi, just shorter.

Parts catalog at a glance

Read the table top to bottom as “steel first, then the stack that holds it, then the scabbard.” When a dealer photo only shows the shiny blade, you are missing half the story: fit of habaki and condition of mekugi matter more for safe handling than whether the hamon looks Instagram-ready.

Blade length and body: nagasa, ha, mune

Nagasa is the measured blade length, tip to the notch where the tang begins (munemachi). It is how collectors and laws talk “how long is this sword,” not the full tip-to-kashira length with handle. Longer nagasa reaches farther and usually adds mass; shorter blades turn quicker in tight rooms. Pair length with sori (curve): more curve changes how the edge meets a target on a draw-cut. Use and safety: a blade that is too long for the wearer catches doorframes and slows saya work. Aesthetics: Edo fashion often favored certain length bands; battlefield survivors can look stubbier after tip repairs.

Ha is the cutting edge, the thin hard side that does the work. Geometry (how steep the bevel is) decides whether the edge bites deep or chips on bone and armor. A soft or poorly tempered ha rolls; an overly brittle one cracks. Compare: some polishers leave a more robust edge for cutting practice; antique museum edges may be kept thicker for conservation. Never “test” an antique ha on scrap metal for fun.

Mune is the spine, the thick back opposite the ha. It stiffens the blade so a bad angle does not fold the steel like a cheap butter knife. On some mounts you can see mune-machi and ha-machi notches where the habaki seats. Safety: people who grab a sword wrong sometimes put a thumb on the mune for control in kata; that is trained grip language, not an invitation to press the ha. Aesthetics: mune shape (roundish vs peaked) is a quiet school clue once you know to look.

Kissaki: the tip

Kissaki is the point section, separated from the main blade by the yokote line on many classic profiles. It thrusts, finishes cuts, and takes ugly damage first when someone pokes hard surfaces. Small tip (ko-kissaki), medium (chu-kissaki), and long (o-kissaki) change mass at the end of the lever. Use: longer tips can feel lively in thrust-heavy work; stubby repaired tips often mean a past break. Safety: tip chips concentrate stress; polishers and restorers treat kissaki carefully because a bad repair ruins value and structure. Aesthetics: tip size and boshi (temper pattern in the tip) are signature school tells. Compare a Kamakura-looking elongated kissaki with a later stubbier fashion and you are reading era taste, not random smith mood.

Hamon and hada: what the polish shows

Hamon is the visible boundary of the hardened edge zone after clay-coated quench and careful polish. Hard martensite near the ha, tougher steel toward the mune: that split is the functional point. Patterns have names collectors toss around: suguha (fairly straight), midare (irregular), gunome (roundish waves), choji (clove-like), notare (gentle undulation). Differences matter for attribution and beauty; they also hint how the smith managed clay and heat. Use: a sound harden still cuts whether the line is flashy or quiet. Safety: a forged hamon is not a painted stripe; if the “hamon” wipes off or looks sprayed, walk away. Aesthetics: bright nie and soft nioi grains along the line are polish poetry; some blades hide a subtle hamon until the light hits right.

Hada is the folded steel skin: itame (wood-grain), masame (straight), mokume (burl-ish), and mixes. It is the fingerprint of how billets were folded and welded, revealed by polish, not etched on in five minutes at a mall booth. Compare schools: some famous lines chase tight itame; others show wilder activity. Use is indirect: good forging under hada supports toughness, but for beginners hada is mostly an authenticity and appreciation tool. Pair this section with sword making when you want the forge-fire version of the same story.

• Suguha hamon: calmer line; often associated with certain classical tastes; easier for beginners to “read” in photos.
• Midare / gunome / choji: more drama; collectors argue school matches; fakes love copying the drama without the steel.
• Hada vs scratch: grain runs through the steel; random scratches sit on the surface. Learn the difference under raking light.

Nakago, mei, and mekugi-ana

Nakago is the tang, the unpolished stem hidden inside the tsuka. File marks (yasurime), shape of the tip (nakago-jiri), and rust patina age the story. Many tangs carry a mei (chiseled signature) and sometimes a date. Use: the tang is the structural root; a welded-on rat-tail tang on a cheap sword is a different animal from a full nakago. Safety: moisture trapped under a wrap rusts nakago quietly, never store a blade wet in the saya. Aesthetics: collectors may prefer ubu (unshortened) tangs; suriage (shortened) tangs show a blade cut down in a later era, history, not automatic trash.

Mekugi-ana are the peg holes through the tang. The mekugi bamboo (sometimes horn) pin goes through handle and tang so the blade cannot launch out of the tsuka on a hard cut. Two holes can appear on remounted or shortened blades. Use: pin placement affects how the handle feels locked. Safety: cracked or undersized mekugi is a classic “sword flew apart in demo” cause, check before swinging anything sharp. Aesthetics: none, really. This is plumbing. Ignore it and you earn a hospital story.

Habaki and seppa: the quiet hardware

Habaki is the metal collar around the blade base, usually copper or copper alloy, sometimes with a two-piece look or engraved texture (nehaba patterns, etc.). It wedges into the saya mouth so the sword stays put until you mean to draw. Too loose: rattle, accidental slip. Too tight: sticky draw, panic yank, cut risk. Differences: plain copper working habaki versus ornate ones on dress mounts; foil-wrapped show pieces versus thick practical collars. Use and safety dominate here; pretty comes second.

Seppa are thin washers that sandwich the tsuba. They fill gaps so the guard does not rock, and they protect soft tsuba metals from chewing against habaki and fuchi. Missing or mashed seppa = clicking mounts and uneven pressure. Compare brass versus copper color; some high mounts use carefully matched sets. Beginners skip them in photos because they are boring. Sword people notice them immediately.

Tsuba: guard, balance, and art board

Tsuba is the hand guard. Functionally it stops the forward hand from sliding onto the ha and can catch an opposing blade in some historical fencing contexts, though movie sparks exaggerate that job. Mass and size shift balance: a heavy iron plate pulls weight toward the hands; a thin openwork guard lightens the tip feel. Safety: sharp tsuba edges can still bite skin; loose tsuba with bad seppa wobbles and distracts.

Style differences are a whole hobby. Early iron tsuba can look thick and sober. Edo soft-metal work (shakudo, shibuichi, copper) carries inlays of gold and silver, flowers, dragons, clan motifs. Openwork (sukashi) cuts negative space into silhouettes. Round, square-ish with rounded corners, and irregular lobed shapes all show up. Aesthetics often outran battlefield thrift in peace centuries: a retainer’s tsuba could signal taste and cash as loudly as a modern watch. Compare a plain sukashi iron piece meant to disappear on the hip with a high-relief narrative tsuba meant to be admired at a gathering, same noun, different social job.

• Iron vs soft metal: durability and weight versus color and inlay detail.
• Sukashi vs solid plate: air and silhouette versus canvas for carving.
• Size, larger guards change hand clearance and balance; tiny guards on some later fashion mounts look sleek and offer less stop.

Tsuka, fuchi, kashira, same, and ito

Tsuka is the wooden-core handle built for two-hand grip on a katana. Length and oval shape should match the school’s wrapping and the user’s hands. A sloppy core that rattles on the nakago is a safety failure dressed as a souvenir.

Fuchi (collar band at the tsuba end) and kashira (butt cap) usually come as a matched pair: same motif language as the tsuba on dressy koshirae. They keep the wrap ends tidy and take impact if the pommel knocks a floor. Differences: plain iron sets on working mounts versus soft-metal story scenes on parade pieces. Use is structural; aesthetics sell the set.

Same (samegawa) is ray skin under the wrap: nodules give grip even if cord shifts. Panels can be full wrap or panels under diamond windows of cord. Quality same is expensive; fake embossed leather shows up on junk. Ito is the cord wrap, traditionally silk or leather, crossed in a pattern that leaves diamond openings (hishigami paper triangles often sit under crossings). Tight ito stabilizes the grip under sweat and shock; loose ito bunches and can hide a migrating mekugi. Colors and materials differ by taste and period revival: black cotton on modern cutters, bright silk on show mounts. Safety: rewrap is maintenance, not vanity, when the cord is rotten.

Menuki are the small ornaments tucked under the ito, usually one on each side of the handle. Beginners miss them in photos because the wrap hides most of the metal. Functionally they give your palms something to register so the grip does not feel like a smooth stick; aesthetically they often match the tsuba and fuchi/kashira theme (animals, plants, clan cues). Cheap mounts glue on flat “menuki” stickers; better ones are cast or carved pieces that sit in carved recesses of the wood core. You do not need to unwrap a museum sword to appreciate them: look for diamond windows in the ito where a bit of metal peeks through.

Saya, koiguchi, kojiri, kurikata, and sageo

Saya is the scabbard: honoki or similar soft wood, hollowed to the blade’s shape, finished with lacquer. It protects the ha from air and clumsy hands, and it shapes how cleanly you can draw. Materials differ: glossy black lacquer, mottled finishes, rare textured skins, family-coded colors on formal mounts. Never store a sharp blade in a hard metal “mall ninja” sheath that scrapes the edge. Use: saya must fit that specific blade’s habaki; swap blades carelessly and you chip koiguchi or loosen retention. Safety: a cracked saya can pinch and then release unpredictably; horn mouth damage is a red flag.

Koiguchi is the mouth of the saya (often buffalo horn) meeting the habaki. Wear here ruins fit.Kojiri caps the tip of the saya so floor taps do not split the wood; metal, horn, or lacquered wood variants exist. Fancy kojiri match the rest of the furniture; plain ones just survive travel.

Kurikata is the side knob (often horn or metal) on the saya that the sageo passes through so the cord stays attached to the scabbard instead of sliding off. No kurikata, and the sageo is just a decoration draped nearby. Sageo is that cord: it secures the scabbard to the obi or to armor cords, and in some arts it is used for binding techniques. Braid styles and colors vary (utilitarian brown versus formal combinations). Aesthetics and school habit show up here; the basic job is still “keep the saya where you left it when you draw.”

How parts work together on a mounted sword

Separately, each noun is trivia. Together, they are a system. Habaki and koiguchi decide whether the draw is crisp. Mekugi and ito decide whether the handle stays attached. Tsuba and tsuka length decide where the balance sits in your palms. Hamon and hada decide what the polishers and collectors argue about after the sword is back on the rack. A wakizashi uses the same system at shorter nagasa; daisho pairs often matched furniture themes without sharing one continuous steel.

When people say a sword “feels dead,” they might mean tip-heavy geometry, a too-heavy tsuba, a too-short tsuka, or a sticky habaki rather than mystical steel failure. Start with the parts list before the poetry.

How this page differs from sword anatomy

Sword anatomy digs into forging geometry: shinogi ridges, cross-section types, boshi behavior, and steel zones. Keep using it when you care why a blade bends or how a polisher reshapes an edge. This page stays the parts catalog for beginners who meet a fully mounted sword: names on the furniture, comparisons of tsuba and saya choices, and a handling checklist. Overlap on hamon and nakago is intentional; depth of focus is not. Read both if you are building real vocabulary.

Beginner mistakes

• Calling every wavy line a masterpiece hamon without checking hada and nakago.
• Ignoring mekugi and habaki fit because the tsuba looks fancy.
• Storing a wet blade in the saya overnight.
• Assuming soft-metal parade mounts equal battlefield gear.
• Forcing a blade into the wrong saya “because wood is wood.”

Closing

Learn the nouns once and every museum card gets quieter. Blade words (nagasa, kissaki, ha, mune, hamon, hada) explain the steel. Furniture words (nakago, mekugi, habaki, seppa, tsuba, fuchi, kashira, same, ito, menuki, saya, kurikata, sageo, kojiri, koiguchi) explain how that steel lives on a body without cutting it by accident. Continue with katana for use and myth, sword making for the forge, and famous swords when you want celebrity steel that still obeys the same parts map.

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