Best Dive Knife

Best Dive Knife – Our Ultimate Guide For 2021

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Going scuba diving isn’t going to a warzone but you’ll still need to carry a knife. A dive knife, to be precise. There’s a bit of difference of opinions in the diving community about the usefulness of carrying dive knives. But whether you are an advocate for or not a fan of carrying dive knives, I think you’ll agree with me that it’s better to carry a dive knife and not need it than need a knife and not carrying any.

Let’s quickly take a look at the potential benefits of dive knives. For one, they help you cut through any underwater material you may get entangled in like a fishing line, kelp, and so on. If you are a commercial diver, a dive knife may aid in your underwater tasks.

You can also signal nearby divers in case of an emergency by banging the dive knife against the metal of your tank. A dive knife will also come in handy in freeing trapped marine life although you should be super careful to ensure you are not putting yourself at risk or harming the animal.

With all these, I think you can see why carrying a dive knife makes sense. I’ve scoured the market to compile a list of the best dive knives available on the market today. Here they are:

The 7 Best Dive Knives for 2021

XS Scuba FogCutter X Knife

XS Scuba FogCutter X Knife

$84.95  in stock
Amazon.com
as of October 17, 2021 4:28 am

The XS scuba dive knife is an essential safety equipment that deserves to be among your diving gear. This knife come with a versatile design that allows you to use it as a normal dive knife when closed or as shears when unlocked.

Whether you are using the XS Scuba knife as a dive knife or shear, it’s very sharp and can cut through the toughest kelp or fish line with ease. The protective case will remain in place until you intentionally unsheath it. And this ensures that you don’t accidentally stab or injure yourself with this dive knife.

This dive knife is designed to be resistant to corrosion thanks to the stainless steel material. However, you should always rinse and lubricate the XS scuba knife after contact with saltwater to enhance its durability.

 Specifications

  • Blade material: 420 stainless steel
  • Blade length: 4.38 in / 11.1 cm
  • Overall length: 9.5 in / 24.1 cm

Pros

  • Very sharp.
  • Versatile design.
  • Easy to release.
  • Protective casing stays in place and isn’t ever accidentally unsheath.
  • Anti-corrosive.

Cons

  • No major shortcomings.

Cressi Skorpion Dive Knife

Cressi Skorpion, Red

$29.95  in stock
Amazon.com
as of October 17, 2021 4:28 am

The Cressi Skorpion is another high-quality dive knife that’s capable of cutting through any obstacle you may encounter underwater. Made of high-quality stainless steel material, the Skorpion is resistant to corrosion, a feature that enhances its durability.

This dive knife has both sharp and blunt tips allowing you to which one you want. The blunt tip as well as the protective casing ensures you don’t accidentally injure yourself with this dive knife.

Thanks to the quick-release mechanism, its easy to unsheath this dive knife with only one hand. And I like that Cressi included standard straps to attach the Skorpion to your leg.

 Specifications

  • Blade material: Tempered AISI 304 steel
  • Blade length: 4.38 in / 11.1 cm
  • Overall length: 9.5 in / 24.1 cm

Pros

  • Option for both sharp and blunt tips.
  • East to release.
  • Resistant to corrosion.
  • Included a standard leg strap.

Cons

  • No major shortcomings.

Other Buying Options:

Scubapro Mako Titanium Diving Knife

Scubapro Mako Titanium Diving Knife with 3.5-Inch Blade for Scuba Diving, Snorkeling or Water Sports

$144.00  in stock
11 new from $144.00
Free shipping
Amazon.com
as of October 17, 2021 4:28 am

If you are looking for a very small and lightweight dive knife, you should take a look at the ScubaPro Mako Titanium Dive Knife. The lightweight and compact design of the Mako makes it ideal for beginner divers who may not be comfortable with carrying bigger dive knives.

The blade of this dive knife features a serrated edge for sawing through rope, a conventional edge for making clean slicing cuts, and also a line-cutting notch. So, while the Mako may be small, it packs a punch.

This dive knife is designed to be corrosion-resistant and the high-quality material makes it very durable. I should also mention the protective case of this knife that protects you from hurting yourself.

 Specifications

  • Blade material: Titanium
  • Blade length: 3.5 in / 8.5 cm
  • Overall length: 7.48 in / 19 cm

Pros

  • Lightweight and compact.
  • Multi-functional blade.
  • Ideal for beginners.
  • Corrosion-resistant.
  • Built to last.

Cons

  • The handle is a bit thin.

Aqua Lung Argonaut Titanium Diving Knife

Aqua Lung Argonaut Titanium Diving Knife (Blunt Tip)

$239.00
$199.00
 in stock
5 new from $199.00
Free shipping
Amazon.com
as of October 17, 2021 4:28 am

I’d describe the Aqualung Agronaut dive knife as a premium dive knife that’s easily among the sharpest and most durable dive knives on the market. Just take a look at this dive knife. It oozes sophistication and looks like something Jason Bourne or James Bond would use.

The Agronaut comes with a multifunctional blade that features both smooth and serrated edges, allowing you to cut through any obstacle you may encounter underwater.

I think the design of the Agronaut’s handle is among the best on the market as its very easy to maintain a strong grip with this dive knife. The 5mm paracord wrapped on the handle of this knife also makes it easy to grip or grasp.

 Specifications

  • Blade material: Titanium
  • Blade length: 4.8 in / 12 cm
  • Overall length: 9.5 in / 24.1 cm

Pros

  • Easy to maintain a strong grip with this knife.
  • Multifunctional blade.
  • Comes in both blunt and spartan edges.
  • Oozes class and sophistication (I just had to add this).
  • Super durable.

Cons

  • All black coloring means it may be a bit difficult to locate this knife if you drop it underwater.

Promate Scuba Diving Knife

Promate KF510-Black, Sharp Tip Stainless Steel Scuba Dive Knife

$44.90  in stock
2 new from $44.90
Free shipping
Amazon.com
as of October 17, 2021 4:28 am

The Promate scuba knife is a very compact and lightweight dive knife that’s designed to travel. There is the quick-release system that makes it easy to unsheath this knife with one hand. And its also easy to disassemble this knife for cleaning and maintenance.

You can get the Promate scuba knife as a sharp or blunt thing knife and the high-quality titanium blade will remain as sharp as ever even after multiple dives.

I like the ergonomic design of the handle which makes it easy to grip this knife even when wearing gloves. And the manufacturer included leg straps in the package.

The titanium blade is also resistant to corrosion, a feature that enhances the durability of this dive knife.

 Specifications

  • Blade material: Titanium
  • Blade length: 5 in / 12.5 cm
  • Overall length: 10.5 in / 27 cm

Pros

  • Compact and lightweight.
  • Ergonomic handle.
  • Easy to disassemble for cleaning and maintenance.
  • Resistant to corrosion.

Cons

  • The included straps are a little complicated to use.

Atomic Aquatics Titanium Ti6 Scuba Diving KnifeOur Top Pick

Atomic Aquatics Titanium Ti6 Scuba Diving Knife Blunt and Pointed Tip Dive Knife Options, Pointed

 out of stock
Amazon.com
as of October 17, 2021 4:28 am

The Atomic Aquatics dive knife is an elegant knife that’s easy to release thanks to the push-button release mechanism. Despite the large size of dive knife, it’s surprisingly lightweight.

I like how comfortable and easy it is to grasp the handle of the Atomic Aquatics knife. There’s also the multifunctional blade that had one serrated edge while the other edge is smooth. Add the notch, which comes in handy when cutting thin ropes and fishing lines) to the mix and you have a knife capable of cutting through anything you may encounter on your diving sessions.

There’s a leg strap included in the package that makes it easy to attach this knife to your leg. And the high-quality titanium material is incredibly strong and durable.

 Specifications

  • Blade material: Titanium
  • Blade length: 4 in / 10.2 cm
  • Overall length: 9 in / 23 cm

Pros

  • Lightweight.
  • Comfortable handle.
  • Multifunctional blade.
  • Comes in both pointed and blunt tip.
  • Includes a cutting notch.
  • Durable.

Cons

  • The included strap can be a bit difficult to adjust at times.

TUSA FK-910/920 X-Pert II Dive Knife

TUSA FK-910 X-Pert II Dive Knife, Drop Point, Flash Yellow

$59.95  in stock
9 new from $59.95
Free shipping
Amazon.com
as of October 17, 2021 4:28 am

I end this list with the Tusa FK-940ti X-Pert ll Dive Knife, a heavy duty dive knife that’s capable of handling anything you throw at it. This dive knife is made of high-quality stainless steel that maintains its edge and is resistant to corrosion.

The ergonomic design of this dive knife makes it easy to handle while the quick-release mechanism allows you to u sheath this knife with only one hand.

Tusa included an easy-to-adjust buckle and strap in the package that allows you to strap this knife to your leg, arm, or ankle while bringing about a comfortable fit.

This dive knife also has serrated and smooth edges on the blade. And it’s easy to disassemble it for cleaning or maintenance.

 Specifications

  • Blade material: 420 Stainless Steel
  • Blade length: 4.5 in / 11 cm
  • Overall length: 10 in / 25 cm

Pros

  • The blade has both serrated and sharp edges.
  • Includes an easy-to-adjust strap.
  • Quick-release mechanism.
  • Easy to disassemble it for easy cleaning or maintenance.
  • Durable.

Cons

  • No major shortcomings.

Best Dive Knives – The Guide 

Why Do You Need A Dive Knife?

One of the most important benefits of a dive knife is that it helps you through any underwater material you may get entangled in like a fishing line, kelp, and so on. Trust me, getting entangled in any of these materials underwater isn’t fun and you’ll need the sharp edge of a dive knife to comfortably free yourself.

Commercial divers will work with a range of tools underwater to perform their tasks and dive knives are usually among these tools. To them, dive knives are an important tool that helps get their jobs done.

While you can signal to nearby divers to get their attention, being able to bang a dive knife against the metal of your scuba tank may come in handy in case of emergencies. A dive knife will also come in handy in freeing trapped marine life although you should be super careful to ensure you are not putting yourself at risk or harming the animal.

Sharp Tip vs. Blunt Tip

Scuba knives either have a blunt tip or a sharp tip (also called pointed tip). The blunt tip is flat and dulled and is more suited to prying than a pointed tip. As the blunt tip is dulled, it’s safer to use as there’s less risk of you accidentally stabbing your leg or even puncturing your BCD when you want to return the knife to its sheath.

The pointed or sharp tip is very strong and designed for cutting or piercing. People that spearfish will need knives with pointed tips to butt their prey.

There’s also the ‘Tanto tip’ which is a hybrid of sharp tip and blunt tip.

Stainless Steel vs. Titanium Blades

Generally, dive knives are made of stainless steel or titanium, two very strong metals. Stainless steel is corrosion-resistant, have a good cutting edge, and may need to be sharpened from time to time depending on the type used. However, a special type of stainless steel called Marine Grade 316 stainless steel retains its edge for a longer time and has increased resistance to corrosion.

Titanium dive knives have the advantage of being lightweight, super strong, completely resistant to corrosion, and retaining their edge for a very long time. Thus, titanium is the best material for dive knives although it is more expensive.

Straight vs. Serrated Edges

To make dive knives ready to cut through anything underwater, manufacturers usually incorporate both straight and serrated edges on them. Straight edges are more suited for finer cutting tasks and are easy to maintain.

Serrated edges, which features a series of ‘teeth’ or mini-edges, is designed to tougher cutting operations like stubborn kell fronds or ropes. And serrated edges maintain their sharpness longer than straight edges although they are more difficult to sharpen.

Dive Knife Positioning

The traditional position to put your dive knife is your leg or ankle. The knife sheath is attached to your legs and the knife placed in it. And when placing dive knives on your leg, put it on opposite your dominant hand to give you better control of your movements with the dive knife.

You can also put your dive knife in the pockets or attachments of your BCD. Some BCDs come with spots for dive knives making it easy to attach them. You can also attach your dive knives to the inflator hose for easy access.

Where you mount your dive knife is ultimately up to you but I recommend attaching them to your BCD. This way, the dive knife is safely stored away and out of your way when not in use. And you can quickly retrieve it when you need it.

Other Factors To Consider When Choosing Your Dive Knife

Durability / Corrosion Resistance

Dive knives made of titanium are more resistant to corrosion than those made of stainless steel. But regardless of the metal used to manufacture your dive knife, you need to rinse it in freshwater after a saltwater dive and allow it to completely dry outside its sheath to enhance its longevity.

Sheath

Two options exist to store dive knives and they are sheath or folding the knives. Folding dive knives have a groove in the handle where the knife folds in. You can store them in your BCDs and quickly retrieve them for use.

A sheath is another option to store dive knives and it allows you to attach your knife wherever you want – your leg, BCD pocket flap, or BCD deflator hose. If your knife isn’t self-folding, you’ll need a sheath. You’ll also need a sheath if you want to attach your knives to your leg, arm, or BCD pocket flap.

It’s common to see sheathes with quick-release button that must be pressed down to release the knife. This way, the knife won’t accidentally get out of the sheath.

Comfort / Grip

The handle of your dive knife should be comfortable and easy to grip, especially if you wear (and you should) scuba gloves. Being able to maintain a firm and steady grip on your knife is key to being able to use it underwater.

How To Travel With A Dive Knife?

In case you are not aware, the Transportation Security Administration (TSA) has strict regulations about sharp objects that can be used as weapon on a plane. But the good news is that you can travel with a dive knife as long as you pack it correctly – the knife should be in a sheath or wrapped carefully around a thick towel.

Also, the knife should be in your checked luggage as the TSA forbids carrying sharp objects that can be used as weapons onboard. Since you’ll be carrying other scuba diving gear, it’s advisable you put your knife and other scuba gear in your checked luggage.

How To Care For Your Dive Knives?

While dive knives are made from strong and durable metals, they still need some maintenance to last long especially after a saltwater dive. As I said above, rinse your dive knife in freshwater after a saltwater dive and allow it to completely dry outside its sheath to enhance its longevity.

Final Thoughts

I’ll end this article by saying what I said at the beginning of this article – “It’s better carry a dive knife and not need it than need a knife and not carrying any.” Go through this list to select a dive knife and while you may not always need it, it’s better to be safe than sorry!

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