About Rockstead Knives
At The Old Man Knives & Tools in Amsterdam, we have one of the largest physical collections of Rockstead knives in Europe. What makes these knives so unique?
1. The edge geometry.
1. Edge geometry
Rockstead applies a so-called "Honzukuri" blade shape to some of their models. This basically means the blade is ground convex on both sides, without a micro bevel. This makes for a very strong edge since this is the most stable edge geometry in existence . Their main inspiration for this shape was the Japanese sword.
Shinogizukuri is another shape Rockstead uses. It is the result of Rocksteads constant journey towards optimal cutting performance. ‘Shinogi’ is a Japanese word describing a line where two surfaces meet. This blade shape features two surfaces. The amazing thing about this is that the angle of the cutting edge starts at 30 degrees from the handle and gradually moves to 24 degrees at the tip. This is done in one continuous flow.
2. Edge finish
- ZDP-189 is an ultrafine powder-metallurgic stainless steel containing a stunningly high percentage of 3% carbon and 20% chromium. Rockstead is able to get their ZDP-189 to an incredible hardness of around 67HRC. The characteristics of ZDP-189 which include an ultrafine microstructure causing an amazing edge retention, make for a great knife steel. Rockstead, however, turns their ZDP-189 into a piece of art, using their craftsmanship and proprietary machines to produce an edge finish unlike anything else in the knife world.
- YXR7 is an ingot high-speed tool steel which makes for very tough knives. Rockstead gets these knives to a whopping 65HRC and manages to keep the edge retention on par. Much like ZDP-189, this steel contains a very high percentage of carbon and because of a different balance in composition this steel is tougher, but it has a lower tolerance to rust. Rockstead fights this battle head on, by applying an ultrahard DLC (diamond like carbon) coating to the YXR7 blades. Because the very apex of the cutting edge is not coated, it is advised to keep the edge dry and clean.
The Old Man Knives and Tools - Amsterdam
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