Katana Nakago Guide — The Tang, Signature & Soul of the Sword

Introduction

The nakago (茨子, tang) is the hidden heart of the katana — the portion of the blade that extends into the handle, invisible during normal use but essential to the sword's structural integrity, historical identity, and collector value. Understanding the nakago will help you evaluate katana quality, authenticate historical blades, and appreciate the full depth of Japanese sword culture.

Browse our handmade katana collection for blades with properly constructed nakago.

The Function of the Nakago

The nakago serves three critical functions:

Structural integrity: The nakago is the connection between blade and handle. A full tang nakago that extends the full length of the handle provides maximum structural integrity — the handle cannot separate from the blade under the stress of cutting. A partial tang is a structural weakness that can cause the handle to fly off during use.

Historical record: The nakago is where the swordsmith inscribes their signature (mei) and other information — the date of manufacture, the owner's name, and sometimes the results of tameshigiri testing. The nakago is the primary means of authenticating historical Japanese swords.

Balance: The weight and length of the nakago affect the sword's balance point. A longer, heavier nakago shifts the balance point toward the handle; a shorter, lighter nakago shifts it toward the blade.

Types of Nakago

Full tang (hon-nakago): The nakago extends the full length of the handle. The strongest and safest construction — the only acceptable construction for a functional katana. All katana in our battle ready collection are full tang.

Partial tang: The nakago extends only partway into the handle. A structural weakness — never acceptable for a functional katana. Found only in display-only or decorative pieces.

Rat-tail tang: A thin, threaded rod welded to the blade and screwed into the handle. The weakest construction — a serious safety hazard. Never purchase a katana with a rat-tail tang for functional use.

Nakago Shape

The shape of the nakago varies by period and school:

• Furisode-nakago: A long, elegant nakago with a curved tip — associated with the Kamakura period
• Kijimomo-nakago: A pheasant-thigh shaped nakago — associated with the Muromachi period
• Tanago-bara-nakago: A bitterling-belly shaped nakago — associated with the Shinto period

The Mei — The Swordsmith's Signature

The mei (銘) is the swordsmith's signature inscribed on the nakago — typically on the side that faces outward when the sword is worn. The mei may include:

• The swordsmith's name
• The province where the sword was made
• The date of manufacture (in the traditional Japanese calendar)
• The name of the owner (if made for a specific person)
• Tameshigiri results (how many bodies the sword cut through)

For historical Japanese swords, the mei is the primary means of authentication. Forged signatures (gimei) are a significant problem in the antique sword market.

Mekugi — The Bamboo Peg

The mekugi (目釘) is the bamboo peg that passes through the handle and nakago, securing the blade to the handle. Traditional mekugi are made from bamboo — a material that is strong enough to hold the blade securely but will break before the handle does under extreme stress, preventing catastrophic failure.

Mekugi should be inspected regularly and replaced when they show signs of wear or cracking. Find replacement mekugi in our sword care collection.

FAQ

Q: What is a full tang katana?
A full tang katana has a nakago that extends the full length of the handle — the strongest and safest construction for a functional sword.

Q: What is a rat-tail tang?
A rat-tail tang is a thin, threaded rod welded to the blade and screwed into the handle — the weakest and most dangerous construction. Never use a rat-tail tang katana for cutting.

Q: What is the mei?
The mei is the swordsmith's signature inscribed on the nakago — the primary means of authenticating historical Japanese swords.

Q: How do I check if my katana is full tang?
Remove the handle by tapping out the mekugi and sliding the handle off. A full tang nakago will extend the full length of the handle.

Q: What is a mekugi?
The mekugi is the bamboo peg that secures the blade to the handle. It should be inspected regularly and replaced when worn.

Summary

The nakago is the hidden heart of the katana — essential for structural integrity, historical authentication, and balance. Always choose a full tang katana for functional use; never use a partial tang or rat-tail tang blade for cutting. The mei inscribed on the nakago is the primary means of authenticating historical Japanese swords.

Shop Full Tang Katana

• Battle Ready Katana Collection — all full tang
• Handmade Katana Collection
• Sword Care Collection — replacement mekugi
• Full Tang vs Partial Tang Guide
• Katana Fittings Guide