The tang is the part of the blade enclosed by the handle. On a Japanese sword it is called the nakago. Kyoto National Museum describes the nakago as the area at the base of the blade encased by the hilt and notes that its shape and inscriptions are part of sword appreciation.[4]
“Full tang” is a modern retail construction description. It generally means the tang extends through most or all of the handle rather than ending as a short welded rod. The term is useful, but it is not a complete quality certificate.
What the claim tells you—and what it does not
| Full tang can describe | Full tang does not prove |
|---|---|
| How far the tang extends inside the handle | The exact steel alloy |
| A blade-and-tang piece rather than a short decorative rod | Heat treatment or hardness |
| A construction field that can be recorded per product | Fit, finish, balance, or quality control |
| Compatibility with a pegged tsuka assembly when the listing also states mekugi | Safe use, or suitability for any particular purpose |
How Prime Katana documents tang construction
Where one-piece full tang secured with mekugi has been confirmed for a model, it appears in the Specification Index and on that product page.
No model is forced into a claim it does not support. Each uses its own workshop record for tang, peg count, dimensions, fittings, and edge state. If a value is not confirmed, it is omitted rather than copied from another model.
How to check a listing without dismantling the sword
- Find a dedicated tang field. “Full tang” should appear in the specification record, not only in a promotional headline.
- Check the assembly statement. A listing may identify mekugi count or another securing method.
- Compare all construction fields. Edge state, steel, hardness source, dimensions, fittings, and intended use remain separate.
- Look for model-specific language. A seller should not copy one tang claim across unrelated sword families.
- Ask when the record is incomplete. Do not disassemble a product merely to confirm a marketing phrase; removal can affect fit and may not be appropriate for every mounting.
Historical nakago and modern retail language are not identical
In museum study, nakago shape, patina, file marks, peg holes, and inscriptions can contribute to attribution and appreciation. The NBTHK’s mission includes conserving Japanese swords with artistic value and supporting the study of sword appreciation and associated craft techniques.[5] A modern “full tang” label is much narrower: it describes a construction feature on a current product. It does not authenticate a sword, establish age, or create historical provenance.
Prime Katana’s documentation rule
Use the individual listing as the source of record: model-specific records always take priority. The term stays separate from edge state, heat treatment, and intended use.
Continue with the Katana Glossary for nakago, mekugi, tsuka, habaki, and saya terminology, or the Buyer FAQ for edge state, hardness, dimensions, and shipping.
Sources
- Kyoto National Museum, “Learning Sword Appreciation Through National Treasures and Important Cultural Properties”.
- NBTHK / The Japanese Sword Museum, About Us.
Frequently asked questions
What is the tang of a katana?
The tang, or nakago, is the part of the blade enclosed by the handle. “Full tang” is a modern retail description stating that it extends through most or all of the handle length.
Does full tang prove a katana is high quality?
No. It does not prove the alloy, heat treatment, fit, hardness, edge geometry, or quality control. Those need separate evidence.
Do I need to remove the handle to verify a Prime Katana listing?
No. Prime Katana publishes the workshop-declared tang construction and uses listing-specific records. Do not disassemble a sword merely to confirm a marketing phrase.
Product specifications can change by model. The individual listing is the source of record. For questions, contact support@primekatana.com.