What does full-tang construction mean in a Japanese sword?

Full-tang means the blade steel extends as a continuous piece through the entire length of the handle, from the cutting tip to the kashira (pommel cap). The portion of steel inside the handle is called the nakago, and it is held in place by one or two bamboo pins (mekugi) that pass through aligned holes in the tang and the wooden handle core. This is the traditional construction method used in authentic Japanese sword making and is considered the strongest structural approach. The alternative — rat-tail tang or welded tang — involves a thin metal rod attached to the blade base, which is far less durable and can loosen or break under stress. Every sword in our collection uses full-tang construction.

What steel is used in these Nidai Kitetsu replicas?

Our Nidai Kitetsu replicas are forged from 1045 carbon steel, a medium-carbon alloy widely favored for collectible sword reproductions. This steel grade offers a strong balance between hardness and flexibility — hard enough to hold a visible hamon temper line along the edge, yet resilient enough to resist brittleness during handling or display mounting. Compared to stainless steel wall-hangers, 1045 carbon steel has a more authentic feel and weight, giving the replica a presence that closely mirrors a traditionally forged Japanese blade. It does require periodic oiling to prevent oxidation, which many collectors consider part of the rewarding ritual of sword care.

What is a real hamon and how do I identify it?

A hamon is the visible temper line that appears along the blade after differential hardening — a process where clay is applied to the spine before quenching, causing the edge to cool faster and harden to a higher degree than the body of the blade. The boundary between these two zones, when polished, appears as a misty, undulating line running the length of the blade. A real hamon is not printed or etched; it has visible activity within the line itself — cloudy areas called nie (crystalline martensite) and nioi (a diffuse glow) that shift under light as you rotate the blade. In this collection, clay-tempered manganese steel and 1095 carbon steel blades carry authentic hamon produced through this traditional thermal process, distinguishing them from decoratively acid-etched imitations.

What is a hamon, and which blades in this collection have a real one?

A hamon is the temper line that forms along a blade during the clay-tempering process. A swordsmith applies a clay slurry to the blade before quenching — the thinner-coated edge cools faster, producing a harder edge, while the clay-insulated spine cools more slowly and stays tougher. The boundary between these two zones becomes visible as a distinct wavy or irregular line running along the lower portion of the blade. A real hamon is genuinely formed by this heat-treatment process and will shift in appearance depending on lighting angle. Blades described as having a "real hamon" or "clay-tempered hamon" in this collection — particularly those in 1065 carbon steel, Damascus, and folded steel variants — carry this authentic feature. Blades described with a "hamon blade" without the clay-temper qualifier may have a polished or acid-etched visual effect rather than a metallurgical one.

What is clay tempering, and why does it matter for a replica?

Updated Feb 2026

Clay tempering is a traditional Japanese blade-making technique where a clay mixture is applied unevenly to the blade before quenching. The exposed edge cools faster, creating a harder cutting edge, while the spine remains softer and more flexible. This differential hardening produces the visible hamon — the wavy temper line along the blade that serious collectors recognize as a hallmark of authentic craftsmanship. On a display collectible, clay tempering elevates the piece from a simple replica to a demonstration of real sword-making methodology, making it significantly more meaningful for collectors who value the process behind the product.