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Columbia River K400BXP Ken Onion Ripple 2 Folding Knife 2.7" Plain Premium Acuto Steel Blade, Blue Stainless Steel Handles

Customer Reviews 3.966 Read 29 reviewsWrite a Review
Part Number: CRK400BXP
Manufacturer: Columbia River (CRKT)
Retail Price: $125.00
Our Price: $79.95
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CRK400BXP: K400BXP Ken Onion Ripple 2
This is an amazing collaboration between Ken Onion and CRKT, the Ripple frame lock folder with premium Acuto stainless steel and a near friction-free IKBS ball-bearing pivot. This is not the aluminum handle model with a liner lock but the premium model with stainless steel handles and a durable frame lock. It's lightweight, fast, ergonomic, and a beautiful example of Ken Onion's eye for design. It's a gorgeous knife and with the Acuto steel, something you won't have to sharpen too often. It's as beautiful as it is fun to play with and could easily replace your current EDC blade.

This knife is noteworthy for its exceptional manufacturing quality, premium stainless steel build, plus an almost unbelievable silky smooth and fast opening action thanks to the use of the IKBS internal knife ball bearing system.

The modified drop point blade has a high hollow grind, swedged top edge, a high satin finish and Razor-Sharp cutting edge. Steel is premium Acuto, stainless, noted for its high chromium and molybdenum content and hardness of 59-60 HRC. It is instantly opened by pressing the blade flipper with either hand. For safety while closed, the blade has a ball detent.

Even the best conventional blade pivot bearings have some degree of friction which resists initial movement, or “stiction.” In contrast, the Ripple blade opening action is almost friction-free due to the IKBS ball bearing system. This innovative and simple design places eight uncaged ball bearings on each side of the blade pivot in races which are machined into the stainless steel handle. It is compact and adjustable at the blade pivot screw if ever needed. Not only is opening and closing exceptionally smooth, the IKBS system is durable and requires little maintenance, and yields a folder with great rigidity and no blade play.

This Ripple KX400 model is a frame lock open build knife with stainless steel frame. In typical Ken Onion attention to detail, the frame lock does not create an unsightly gap in the right frame, but its cut is neatly integrated into the grip design of the frame, which is CNC machined with a complex ‘ripple’ textured pattern plus 44 small lightening holes.

The Ripple K400KXP receives a blue titanium nitride coating, which we then hand buff to give a pocket worn look, that is to lightly reveal the underlying stainless steel on the high points. The Ripple K400BXP achieves the same effect, but with a dark ultramarine blue titanium nitride finish.

Both models feature a removable stainless steel mirror polished pocket clip, high-mounted, and also with small CNC-drilled holes.

This knife combines brilliant design, custom knife quality, and advanced manufacturing technology.
  • K400BXP: High Satin blade finish with Blue Titanium Nitride frame coating Pocket Worn, Razor-Sharp Cutting Edge
  • Blade Length: 2.7" (69 mm)
  • Blade Thickness: 0.10" (2.5 mm)
  • Blade Steel: Acuto, 59-60 HRC
  • Handle Material: Titanium Nitride Coated Stainless Steel
  • Handle Length: 3.8" (97 mm)
  • Overall length: 6.5" (165 mm)
  • Locking Mechanism: Frame Lock
  • Weight: 2.3 oz. (65 g)
  • Made in Taiwan

UPC Code: 794023940008

Frame Lock
Frame Lock
Developed by Chris Reeve, it functions like a liner lock but the lock is comprised of one of the handle scales. It's an extremely strong and easy to manipulate lock.
Pocket Clip
Pocket Clip
Includes a pocket clip for easy accessibility and a more secure carry.
Steel Handles
Steel Handles
Stainless Steel knife handles provide strength and durability while using chromium oxide to create a rust-resistant barrier.
3.966 (29 reviews)
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4 out of 5
Randolph N
Ypsilanti, Michigan
Mar 05, 2015
Pros: Overall Quality, Handle Feel, Pocket Clip, Blade Sharpness, Weight, Handle Material, None
Cons: Blade Sharpness, Ease of Opening
Ken Onion's Ripple 2 finds new home in my pocket.
This review is about how quickly the ripple 2 became my new EDC . Carrying every day, i soon found myself proud to show off my new best friend. Like so many things, I expected the photo to look better than the real thing. Not so with the ripple 2. This piece of art should stand among the best. [In my opinion,,] My only complaint fall with my being left handed and where my thumb falls when opening. Any pressure applied with thumb makes the blade flipper almost impossible to operate. The thumb stud is painfully sharp after repeated openings. Even with my complaints i think the ripple is the most eye catching and sharpest knife i own. thank for listening..
4 out of 5
Chicago Il
Mar 05, 2015
Pros: Overall Quality, Lock Type, Handle Feel, Weight, Blade Material
Cons: None
Good but rough
Nice little knife but has a little issue. The knife is a little sharp on the edges and the flipper tab it very sharp. I ended up grinding It down with my dremel to soften it up. My only other complaint is that its only tip down carry. I'd still say it's worth the money though.
5 out of 5
Swannanoa, NC
Mar 05, 2015
Pros: Overall Quality, Blade Sharpness, Handle Feel, Weight, Blade Material
Cons: None
This is a sharp looking knife from the blade to the grooved blue metallic handle. I don't use the clip but unlike other reviewers find it unobtrusive. The weight is minimal and for an EDC it takes up little space in my pocket. The flipper for opening is really stiff but with a minimum of patience and practice you'll find it not only simple to deploy but be amazed at the lightening quick and effortless opening. On most flipper type knives such as these a light flick or touch is all it takes to open the blade and many of these come with a safety to lock it closed,preventing unwanted openings in your pocket. This blade is crafted in such a way that the safety is unnecessary. While holding the handle, place your finger on the flipper and flick the handle slightly while depressing. The blade will explode out to the open position,presenting you with a surgically sharp edge and a point that can pierce most materials easily. I use mine a lot while woodworking and opening boxes, etc. If you're looking for something unique and highly functional, buy this knife, it's sharp and practically unnoticeable in your pocket.
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