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Underwater Kinetics

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About Underwater Kinetics Blue-Tang HYDRALLOY SS Knife, Drop Point

The Blue Tang HYDRALLOY is UK's Improved-Take on the Classic, Multi-Functional Dive Knife UK patented their own HYDRALLOY Steel for a Blade that is both Strong-and-Corrosion Resistant where most competitors' Blades only offer one of those features. The Special HYDRALLOY utilizes a Unique-Blend of Metal-Alloys and Proprietary-Finishing Techniques to provide a Knife with the Strength of 420-Stainless Steel, while Exceeding-the-Corrosion Resistance of 316-Stainless Steel. The Blue Tang HYDRALLOY Knife is Built-Rugged, with a Partial Serrated Edge on one side and Straight-Edge with Hooked Line Cutter for Cutting through All-Types of Rope and Line. It is the Ultimate Safety Tool.

The Knives 5" (12.7 cm) Blade and a Heavy-Duty Pommel End-Cap for Signaling like a Tank-Banger make this one Multi-Tool Functional Knife. The Blue Tang Knife has an overall measurement of (L x W x H) 10.0" x 2.15" x 1.0" (25.40 x 5.46 x 2.54 cm) and weighs 9.3 oz (263.65 g). The Knife Blade has a Drop Point Tip Design. The Knives, Rubber Ergonomic Handle with Extended Thumb Guard on the Hilt Fits-Comfortable in your Hand. A Quick Release Sheath has a Locking Mechanism on it, so the Knife won't Fall-Out Underwater or Stab-You. Sheath allows One-Hand Insertion and comes complete with Ozone Resistant Quick-Release Leg Straps. All this make this the Best All-Around Diver's Knife. The Knife is available in multiple colors, comes with a User Manual and is covered by a Limited Lifetime Warranty.

Warranty Information

This product has a limited lifetime warranty.


Underwater Kinetics Blue-Tang HYDRALLOY SS Knife, Drop Point Features

  • Non-Corroding HYDRALLOY Blade
  • HYDRALLOY: Strength of 420-Stainless Steel, while Exceeding-the-Corrosion Resistance of 316-Stainless Steel
  • Line Cutter Hook Easily-Cut through Any Entanglement
  • Straight and Serrated Cutting Edges
  • 5" (12.7 cm) Blade
  • Heavy-Duty Pommel End-Cap for Signaling (Tank-Banger)
  • Drop Point Tip Design
  • Multi-Tool Functional Knife
  • Dimensions (L x W x H): 10.0" x 2.15" x 1.0" (25.40 x 5.46 x 2.54 cm)
  • Weight: 9.3 oz (263.65 g)
  • Rubber Ergonomic Handle with Extended Thumb Guard
  • Knife Fits-Comfortably in Divers Hand
  • Quick Release Sheath Locking Mechanism, Knife Won't Fall-Out Underwater or Stab-You
  • Sheath Allows One-Hand Insertion
  • Ozone Resistant Quick-Release Leg Straps
  • Best All-Around Diver's Knife
  • Salt Water Corrosion Resistance and Keen Edge
  • Available in Multiple Colors
  • User Manual
  • Limited Lifetime Warranty

Underwater Kinetics Blue-Tang HYDRALLOY SS Knife, Drop Point Customer Reviews Powered by TurnTo®

Review Summary


(based on 22 reviews)


of respondents would recommend this to a friend.

Ratings Distribution

  • 5 Stars



  • 4 Stars



  • 3 Stars



  • 2 Stars



  • 1 Stars



Most Liked Positive Review


Dive Knife

Was very confortable to wear while in the water. easy to reach and use when attached to leg.


Most Liked Negative Review


bad knife

It got to my vaction home taympa bay florida and I took it out of the box it looked deribale so I though i would try it out. so i whet to my bout and tried to cut a thin line but it did not work and then my second test was to cut a rop about 2/4 of an inch thick and it would not cut so I give this knife out of fore stars 0 of them

Reviewed by 22 customers

Displaying reviews 1-5

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heavy duty knife.


I haven't dived with this knife yet but it seems well made and very sharp.


you will be happy with this knife


hard to design and make a perfect dive knife, but this knife should please almost any diver. it is made from the right steel, has the right type of serrations, and the right length to be useful. if you want a pointed blade, i think this is an excellent choice.


Felt no Fear


Used this on dives in Mexico last summer.


Love it


This was my first knife and I don't plan to replace it. The grip seems really odd but is very comfortable in use. The blade holds up great and the metal end is great for getting other's attention. My brother has the Tusa Imprex knife which is great in its own right but I love my Blue Tang!


great knife


This is my second Blue-Tang Hydralloy knife. Unfortunately, I lost my first one that I'd been using for 3+ years. This is a great knife. The blade doesn't rust. Sometimes you'll see a small rust stain on the blade, but that's from an internal component of the sheath, I believe. It holds an edge well. My first one freed me of a few monofilament entanglements, and quickly dispatched many fish that I'd speared.

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Questions & Answers Powered by TurnTo®

Questions about this item:

Bryan P  I am looking for a knife and sheath the can be strapped to my lower leg. Is this a good knife/sheath for this application?
Kasia W  This knife can be strapped to your leg.
CAS C  Perfect. Have had times 2 years. The right size. Sharp. Quality product.
HAL S  This is how I wear it. Knife is really sharp. And has not corroded
marc P  Yes it is ok, to use on the leg.
Doug O  I don't see why it couldn't. I use it for snorkeling but usually attach it to my thigh. I have skinny calves so it doesn't feel as secure as when it's on my thigh. Plus I need to make it really tight on my calve so the straps dangle around. Depending on the size of your calf it should work. It's really just a preference thing.
PAUL A  Yes. Also very sharp and sturdy. I have a yellow one, just better visibility
TIM D  It's a good size and the quick release hasn't failed me. I worried about the sheath opening accidentally as I bounce of rocks but it's never failed once. The knife comes apart really easily so you can clean all of it. I dive salt water and all knives rust a little no matter what grade, this one allows me to make sure I can clean the whole thing and get a descent lifespan from the knife.
VIRGINIA M  Yes and this is one of the best knives I ever bought
STEVEN P  I'm a public safety diver and I often dive in black water (zero visibility). I carry several cutting implements and I carry this knife strapped to the inside of my lower right leg. It has a smooth edge, serrated edge, and a line cutter, which are all very sharp from the factory, and it holds its edge very well. It has a full length tang and is easy to take apart for cleaning and drying. The sheath is very secure and it's easy to remove the knife. It's a good knife that I highly recommend.
MARK P  Yes!
Deb W  How and where does this knife attach? On the BC? On the leg with straps?. I'm looking for a knife in this price range that attaches to the BC. I don't seem to see in the description, how it attaches. Maybe I just can't see it. Thanks,Deb
DONALD C  Hi Deb, The knife attaches with rubber straps (included) to the leg. Hope that helps.
Deb W  Thanks for the info, Donald. Not what I'm looking for. I'm looking for one that attaches to the inflator hose of BCD. Deb
RODOLF P  Aloha Deb, It's a good knife, and has straps to attach to the leg. Not sure if it can be modified to attach to your BC, or maybe just use zip-ties to attach the sheath to your BC. Good luck and happy diving - Happy Holidays!
Deb W  Rodolf, Thanks for the feedback! I think I could use zip ties to at attach it to the inflator hose and not use the leg straps. Do you think that would work? TIA, Deb
RODOLF P  Hi Deb, The zip ties should work, however, the knife is pretty heavy, so might be a bit heavy on the inflator hose. There's also a 2-finger release mechanism that makes it perfect for the leg, but might make it tricky to release from the inflator hose. Hope that helps - Happy Holidays!!
STEVE J  It attaches via straps to one of your limbs. Two adjustable rubber straps come with the knife. Not sure why you would want one that attaches to the BC to be honest. When you need to use a knife it is easy to remove it from the holster when it strapped to your leg. And easy to put it back. On the BC would be tough to find I reckon. Also risky that you might stab the BC with it when trying to put it back. Hope this helps.My sons and I have one of these Blue Tang knives each, and love them. They come apart so you can clean them too.
LEE K  It's a leg-strap style of knife, at least the way I use it.
Deb W  Thanks for your input, Lee! Appreciate it! Deb
THOMAS F  Attaches to leg via straps
EMIL C  The leg with straps. I am very happy wit this knife...it is a good buy
Deb W  Emil, Thanks very much for responding. It is very helpful to me. Deb
ROBERT R  The knife comes wth a nylon/velcro strap that goes above the calf and a rubber strap with quick release that holds the tip to the leg. Works well, but tends to slide toward the front of my leg as I dive prone. That isn't a problem as it is easy to get at with either hand. Can be attached to a BC, but you will have to engineer the fit. Can be made to fit your 2 inch web belt on BC or weight belt 9break out plastic bits). Other positive features are a very sharp and corrosion resistant blade and assembly that avoids any metal-metal contact to eliminate galvanic corrosion and easy disassembly for rinsing salt out of any possible crevice. It is my favorite full-size knife.
ROY D  It does have leg straps but I attached it to my BC with zip ties
Deb W  Hey Roy, Where on your BC did you attach it? On the inflator hose? And did you put the zip ties thru the slits where the leg straps would have gone? TIA, Deb
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