Katana Kissaki Guide — The Tip That Defines the Blade
Share
Introduction
The kissaki (切先, tip) is the most technically demanding part of the katana to forge and polish — and one of the most important indicators of a blade's quality and period. The kissaki's shape, size, and polish reveal the swordsmith's skill and the blade's historical context. Understanding the kissaki will help you evaluate katana quality and appreciate the extraordinary craftsmanship required to produce a great tip.
Browse our handmade katana collection and T10 Katana Collection for blades with quality kissaki.
The Anatomy of the Kissaki
The kissaki is defined by several key elements:
Yokote (横手): The line separating the kissaki from the main blade — a distinctive feature of Japanese sword geometry not found in most other sword traditions. The yokote should be a clean, straight line perpendicular to the blade's edge.
Boshi (帽子): The hamon pattern within the kissaki — the continuation of the temper line into the tip. The boshi is one of the most technically demanding elements of the blade to create and one of the most important criteria for evaluating hamon quality.
Fukura (脹): The curve of the cutting edge within the kissaki. A full fukura (ikubi) has a rounded, full curve; a shallow fukura (ko-kissaki) has a more pointed appearance.
Kissaki Types by Size
Ko-kissaki (小切先) — Small Tip: A small, refined tip associated with the classical Heian and Kamakura period blades. Ko-kissaki is elegant and refined but less robust than larger tips. Associated with the tachi of the mounted samurai.
Chu-kissaki (中切先) — Medium Tip: The standard kissaki size for most katana — a balanced combination of elegance and robustness. Chu-kissaki is the most common type in production katana and represents the classical ideal.
O-kissaki (大切先) — Large Tip: A large, robust tip associated with the Nanbokucho period (1336–1392) and some Sengoku period blades. O-kissaki provides a stronger, more penetrating tip but is less elegant than ko-kissaki.
Ikubi-kissaki (猪首切先) — Boar's Neck Tip: A very short, wide tip with a full fukura — associated with some Kamakura period blades. Extremely robust but unusual in modern production katana.
The Boshi — The Hamon in the Kissaki
The boshi is the continuation of the hamon into the kissaki — one of the most technically demanding elements of the blade to create. Common boshi types include:
- Ko-maru (小丸): A small, round boshi — the most common type
- O-maru (大丸): A large, round boshi — associated with some Shinto period blades
- Kaen (火炎): A flame-like boshi — one of the most dramatic and prized types
- Jizo (地蔵): A boshi that turns back sharply — associated with some Bizen school blades
How to Evaluate Kissaki Quality
A quality kissaki should have:
- A clean, straight yokote line perpendicular to the edge
- A well-defined, active boshi with visible nie or nioi
- A smooth, consistent fukura curve
- A polished surface that matches the quality of the main blade
FAQ
Q: What is the yokote?
The yokote is the line separating the kissaki from the main blade — a distinctive feature of Japanese sword geometry.
Q: What is the boshi?
The boshi is the hamon pattern within the kissaki — the continuation of the temper line into the tip.
Q: Which kissaki type is best?
Chu-kissaki (medium tip) is the most balanced and classical choice. Ko-kissaki is more elegant; o-kissaki is more robust.
Q: Why is the kissaki the hardest part to forge?
The kissaki requires precise control of the blade geometry in three dimensions simultaneously — the yokote, fukura, and boshi must all be correct. A mistake in the kissaki cannot be corrected without significant rework.
Q: What is a kaen boshi?
A flame-like boshi — one of the most dramatic and prized boshi types, associated with some of the finest historical blades.
Summary
The kissaki is the most technically demanding part of the katana to forge and polish — and one of the most important indicators of quality. Understanding kissaki types (ko, chu, o, ikubi), the yokote, the boshi, and the fukura helps collectors evaluate quality and appreciate the extraordinary skill required to produce a great tip.