Benchmade Undercurrent 18040S CPM MagnaCut, Depth Blue Santoprene fixed knife

The Benchmade Undercurrent 18040S CPM MagnaCut, Depth Blue Santoprene is a reliable fixed knife for intensive use on a boat, at the docks or along the coast. With its partially serrated edge, this knife is very suitable for cutting through tough ropes. It is also ideal for processing and cutting up fish, either for consumption or to make fishing bait. The Undercurrent comes with a practical sheath that can be attached to your belt, backpack, or boat. The sheath features a press-stud that securely holds the knife in place, while allowing you to quickly and effortlessly remove the knife.




The blade of the Benchmade Undercurrent 18040S CPM MagnaCut, Depth Blue Santoprene fixed knife measures 11 cm in length and 2.8 mm in thickness. The total length is 24 cm.



Blade made of CPM Magnacut steel
The blade of this Benchmade Water Class is made of CPM Magnacut steel, possibly the most revolutionary steel of the 21st century. MagnaCut offers an unrivalled balance between sharpness retention, toughness, corrosion resistance and ease of sharpening. Since the release of CPM MagnaCut in 2021, it has become one of the most popular steels in the world of knives. The MagnaCut blade of this pocket knife measures 11 cm in length.

History of CPM Magnacut
This type of steel was developed by Dr Larrin Thomas, a metallurgist who has dedicated his career to improving knife steel. He is the son of Devin Thomas, a famous damascus smith who supplied Chris Reeve Knives with steel for many years. Dr Larrin Thomas works in the automotive industry but is passionate about knife steels. He thought it should be possible to do better, and together with Crucible Industries came up with CPM MagnaCut. Read more about MagnaCut here.



The ‘stonewash’ process was chosen for the finish of this blade. The stonewash process involves the blade being placed inside a drum with ceramic stones, or media, and then vibrated or tumbled for several hours. The result is a finish that looks precisely polished or roughened depending on the version. The advantage of stonewashing, however, is that signs of use are much less noticeable. That makes it a popular choice for knives that see a lot of use.



Benchmade Water Class: knives for fishermen and maritime use
Benchmade’s Water Class knives are made for maritime purposes; from recreational fishing and kayaking, to use at sea while sailing and deep-sea fishing. The blades within this series are made of corrosion-resistant materials such as CPM MagnaCut steel. The sheaths and handles are also designed to withstand wet conditions. Ideal for all your active activities on rough waters.



About Benchmade
Benchmade was founded in 1987 by Les de Asis in California. It began as a small company producing butterfly knives. With a strong commitment to innovation and quality, Benchmade quickly grew and moved to Oregon, where it expanded its production capacity. A signature feature of Benchmade is the Axis lock, which is also used by other brands today.



Looking to personalise your new purchase?
Add an engraving! Our engraving machine will turn your Benchmade Undercurrent 18040S CPM MagnaCut, Depth Blue Santoprene fixed knife into something truly special. Personalise your own gear, or create a unique gift. We can engrave names, dates and short quotes. Logos and small images are also possible. Ideal as a business gift, for your wedding party or when you just fancy spoiling yourself.

The engraving process is simple: when engraving a name, date or short text, simply choose the option ‘Add engraving’ next to the ‘Add to cart’ button. The rest is self-explanatory. Would you prefer to have an image, logo or more detailed engraving? Take a look at our Advanced Engraving options.