Fukura Tsuku and Fukura Kareru
The blade tip of a samurai sword is known as a kissaki. A distinction is made between a curved tip, known as a fukura tsuku, and a straight tip, the fukura kareru.
The length of the sword tip
There are also different lengths of the sword tip:
Co
This is the name for a relatively short blade tip.
Chu
Is the name for a medium-large tip.
O
This is what a long blade tip is called.
Hardness pattern on the sword tip - Boshi
Similar to the hamon on the rest of the blade, there is also a hardening line on the tip of the blade. This is known as boshi and is differentiated according to pattern:
Ichi May
The tip is completely hardened
Yaki Zume
The line of no return
Kaeri Asashi
The short turnaround
Kaeri Tsuyoshi
The straight turn
Ko Maru
The small circle
O-Maru
The big circle
Midare Komi
Corrugated
Kaeri Fukashi
The long wave
Jizo
The head shape
Kaen
The flame shape
Source: "Das Samuraischwert", published by Ordonnanz-Verlag in 2004
You can find more interesting articles about other components of the samurai sword in our article category Components of the samurai sword.
