Boker USA Kwaiken OTF Automatic Knife Black Aluminum (3.375" Satin) 06EX551


  • Standard-style blade made from D2 steel with a satin finish.
  • Black-finished thumb slide for OTF automatic double action.
  • Black-anodized aluminum.
  • Deep-carry pocket clip for right-side carry.


The Kwaiken OTF knife is an exciting offering from Boker. This Lucas Burnley design features a milled aluminum handle that provides a comfortable grip grip. The blade pops open and closed with authority by using the slide-switch on the spine of the handle. A deep-carry pocket clip is included for everyday carry.

Boker is a big name in the automatic knife world! Check out our selection of Boker automatic knives!

Item #BHQ-115743
MSRP: $166.95
Our Price: $145.95
In Stock!

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  • Overall Length: 8.50"
  • Blade Length: 3.375"
  • Cutting Edge: 3.50"
  • Blade Width: 0.63"
  • Blade Thickness: 0.11"
  • Blade Material: D2
  • Blade Style: Standard
  • Blade Grind: Flat
  • Finish: Satin
  • Edge Type: Plain
  • Handle Length: 5.00"
  • Handle Width: 0.875"
  • Handle Thickness: 0.50"
  • Handle Material: Aluminum
  • Color: Black
  • Weight: 3.15 oz.
  • User: Right Hand
  • Pocket Clip: Tip-Down
  • Knife Type: Double-Action OTF Automatic
  • Opener: Thumb Slide
  • Brand: Boker
  • Model: Kwaiken OTF
  • Model Number: 06EX551
  • Designer: Lucas Burnley
  • Country of Origin: USA
  • Best Use: Tactical
  • Product Type: Knife

Customer Reviews

Kwaiken OTF
Terry J. on May 28, 2022

Awesome blade! One of my favorite OTFs! It has a smooth handle with a quick opening! It's definitely worth the price. You won't be disappointed!

Paul S. on May 10, 2021

Excellent action for the price. D2 blade. No "twang" when actuating the blade. Overall nice knife. My new EDC

Cool knife, basic, clean, works.
Robert W. on Apr 2, 2022

I love the knife, but after a couple days, the close lock mechanism stopped working, I did some research, could see the issue with blade out, cleaned it up a little with file, now works like gem. Good knife for half the price.

Johnathan s. on Jul 3, 2021

Bought this knife a while ago. I put a review up but never seen it on here. This was way back in April. So I bought the first one. After two hrs it stopped locking up when pulled back in. And started not locking when deployed. Soo ok just thought it might be a defective one. So sent it back and bought another one. While waiting to get my refund. After a week the 2nd knife came. Right out the box same thing not locking both ways. I was sooo disappointed. Because it is a really really solid knife and very little blade play. And I love the sleek look. I love simple all black with mirror or satin finish drop point blades. So I had to send that back. The thing is the first one I received was marked #46 so I was like nice I have the 46th one made. And that one failed. So when the second one arrived it was marked #5100.. or in that range. So I thought it was just the early first ones that were defective. I was wrong. They both failed badly. So BHQ sent me a 50$ gift card and I went ahead and got the boker eagle. Witch I regret getting. Lol. I don’t like the recurve blade and was not sharp out of the box. And it was a pain to sharpen. But that boker eagle fired great out and back in no prob. I just should’ve gave this one a 3rd times a charm. Now they are out. And Iv been waiting and waiting for the email or text message saying back in stock. Cause I really do want the knife.

Brandon M. on Jun 15, 2022

I used this knife for 2 weeks then it started failing to lock when retracting. Now it does not lock in the retracted position at all

Blade HQ response:
We're very sorry to hear about the trouble you're having. Have you contacted our customer service department yet ([email protected])? We'd like to help you get this resolved. Thanks -BHQ
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