Best Dive Knife under $50 Review in 2022

Dive Knife under $50 New divers more often than not undermine the importance of owning a good dive knife. Yes, you rarely will use the knife but when you use it, it will be a matter of life or death. You may not use the knife to fend off enemies beneath the waters but you will cut ropes lines vegetation and other things to get yourself free when trapped.

It is a very scary situation as unlike in swimming pools, no one can see you as the water is dark and you don’t have the luxury of calling for help. If you are new and get the opportunity to go on a guided dive,

you may not find the dive knife of use but it will still be a nice accessory especially events. If you are however an experienced diver and will be getting into heavy vegetation, shipwrecks caves, or unclear waters, a diver knife is a must-have.

So what is a good dive knife made of?

Well, you should understand that knives for diving are completely different from normal knives. This is because the knife is expected to work efficiently underwater when the diver has gloves on. For this reason, the following factors are important in a good dive knife.

Consider the tip of the knife. There are blunt as well as pointy tips available in the market. However, blunt tips are highly recommended, as you are less likely to stab yourself with them. In addition,

you are not going to stab anything underwater. Dive knives come in either titanium or stainless steel. The stainless steel used is either 400 or 300 series. The 300 stainless steel series is much more resistant to rust than the 400 series but it is softer.

Titanium knives on the other hand are for the most part rust proof as they do not contain any carbon. The downside to this is the fact that they chip easily.

Titanium knives are however recommended as they are rustproof and since divers will use them mostly to cut through thick vegetation, the chipping should not be a big issue.

The blade of the knives is either non-serrated, serrated, or both. The non-serrated blades are efficient in cutting through natural things such as vegetation while serrated blades come in handy when cutting through non-manmade materials. Knives that have both of these blades should have a length that can accommodate both of them.

Speaking of length, these knives range from small, medium to large. However, despite their length, small knives can get the job done.

They however have to have handles that are large enough to provide a firm grip with gloves on. Medium-sized dive knives are however best as they do not limit your mobility.

When you are purchasing a dive knife under $50,

find one that has a line cutter (this is a notch found on the knife that is designed to cut loose the fishing lines). Lastly, consider the sheath. It is very important as it secures your knife during diving. If it does not fit on your leg properly,

do not use it lest it falls off and your diving adventure turns into a rescue mission. Apart from the factors above, most of these knives are the same.

1. Promate Scuba Dive knife under $50

The Promate Scuba Dive Snorkel Titanium Knife. The handle to this dive knife is firm and comfortable and its grips are very secure. The blade is made from titanium which makes it resistant to rust caused by the salty waters.

It has a sheath that engages positively and releases easily. In addition, the sheath has adjustable straps to help fit firmly. And the fact that its blade is made from titanium makes it easy to maintain.

It is lightweight and therefore does not weigh you down when you are diving. One of the major advantages of this knife is that it is stronger and durable than most stainless steel knives. However, several customer reviews state that the fact that the blade is pointed makes it easier to stab oneself.


  • the handle is comfortable and simple to grasp
  • Really good value for a Titanium dive knife
  • a large variety of colors
  • Requires little to no maintenance


  • Needs a bit of a sharpen out of the box

2. Bahia Dive nife under $50

This heavy-duty, premium 20 stainless steel knife was designed with visibility, safety, and versatility in mind. There are three types of blades on this knife, which help you prepare for any diving emergency; a straight edge for slicing, a jagged edge for tearing, and a sugar cutter.

With a bright green sheath and handle, this knife will be easily seen for you and your dive buddy to reach quickly, perfect for emergencies or frequent use underwater. You no longer have to search when you fall to the bottom of the ocean!

This knife features a locking sheath with a quick-release feature, which keeps the knife secure when not in use but easy to remove when needed. Two 19 inch adjustable rubber straps are included,

which are attached to the back of the case via 0.75-inch strap loops. This knife attaches to the shin, away from important scuba gear but can be used when needed.

This knife is perfect for diving, snorkeling, and fishing! Suitable for both fresh and saltwater.

CARE INSTRUCTIONS IMMEDIATELY AFTER MAINTENANCE: Rinse well; Remove from the housing and operate all moving parts while submerged in tap water to remove sand or other debris.

Dry the blade and sheath thoroughly with a towel. Coated with a light layer of silicone to prevent corrosion; Do not use petroleum-based lubricants. Apply WD 0 to the locking mechanism to maintain ease of release.

WHY YOUR Knife NEED MAINTENANCE: Before cleaning your knives, keep in mind the type of material used to forge the blades. The two most common materials used in a blade are titanium and steel.

Titanium knives are durable and light, but they can be difficult to sharpen and can be expensive. Stainless steel diving knives are easier to sharpen and less expensive but require more maintenance to prevent rust.

If you take a steel knife, follow the tips above after each dive. Saltwater is corrosive. Stainless steel is not recommended for use in chlorinated water (swimming pools).


  • The durable high carbon 20 stainless steel blade is easy to sharpen.
  • Three types of blades in one
  • 19inch adjustable quick release clip and lower leg straps,
  • The sheath includes a quick-release locking mechanism for easy access.
  • The 5 inch blade includes a heavy duty handle.


  • The lock is too strong, making it very hard to open. The cheap straps broke immediately.

3. McNett Saturna dive knife under $50

The McNett Saturna blunt tip outdoor and dive knife is a tool that has high-quality efficiency. It is made from a 400 series stainless steel and is, therefore, rust-resistant.

One major advantage of this knife is the fact that it can be used for most outdoor activities including hunting kayaking rafting and many more. Its sheath has multiple attachment options and is design for quick release. In addition,

the knife completely disassembles which makes it easier to clean. It is available on Amazon in yellow color and a 3-inch length. The sheath and the knife however show a considerable amount of rust after diving in saline water.


  • Easy to use
  • High-Quality blade
  • easy cleaning
  • Textured Grip
  • Looking Good


  • Handle is a bit short

4. Cressi Lima dive knife under $50

A bit on the small side, the Cressi Lima knife is lightweight. It comes with a durable sheath and a quick-release system that can be operated easily with one hand.

Blades are double-edged, one with a straight edge and one with a serrated edge, ideal for cutting even thick and robust ropes. As for the blade itself, it is highly corrosion and rust-resistant, and it comes pre-sharpened.

There is also a notch on the blade that is used as a line cutter. It can also be attached to many other diving equipment pieces, including your regulator and lead. The Cressi Lima knife is a small, light dive knife. The blade is only 2.95” long,

The compact size of this knife makes it portable and easy to bring along on any dive.


  • This knife has a lot of features that make it great for divers. It is easy to attach to diving kits and can be kept on hand in many ways.
  • This knife is lightweight and doesn’t take up much space.
  • The double-edged blade is available in a variety of sizes and is versatile. Because it has a line cutter.


  • The handle of the knife is too small to hold comfortably. It’s especially hard to grip with gloves on.

5. Tusa Imprex dive knife under $50

TUSA Imprex sharp tip knife with holster dive knife is made from a high quality 420 stainless steel. It is easy to clean and maintain, as it can be disassembled completely.

It also includes a blade with a serrated edge and a line cutter. It features a sheath that has a lock button to secure the knife.

It comes in shark silver colors and cobalt blue. However, one disadvantage of this knife is the fact that it can get unclipped from the straps and sink to the bottom of the water without your knowledge.


  • Construction feels sturdy and very high quality
  • Requires no/minimal maintenance
  • The quick release button works really well


  • The manual/instructions aren’t the most clear Can be easily

6. Cressi Skorpion Dive knife under $50

The Cressi Supion is made of Japanese 420 stainless steel and is a medium-length knife with a durable blade. The size of the blade is 4 “in. U 11 cm and the total length including the handle is 9 ⅛ in. (23.20 cm).
Scorpio has a straightedge on one side and a stainless steel blade with a wire cut on the opposite side of the serrated end.

You can get it at both sharp and dull points, both sharp and very effective at cutting lines. The included sheath has a locking mechanism that secures the casing to the blade,

but it can also be removed with one hand by pushing the polymer thumb sheet. Two standard straps help attach the holster to the leg.
Some users report that the knife blade (not the blade itself) tends to rust only at the surface level. Rinse thoroughly with fresh water before storing.


  • It features a blunt tip or a pointed tip.
  •  Serrated and straight edges, a wirecutter is included. 
  • The locking mechanism keeps the sheath in place and can be easily released with one hand.


  • If not properly rinsed, knife tangs rust easily.

7. Riffe standard spearfisher’s dive knife under $50

Riffe standard spearfisher’s knife is a 4” blade of high quality and that is made from 420 stainless steel. Its overall length is 8”, which ensures that it provides, affirm grip.

In addition, the knife comes with a sheath and leg straps made of rubber. To get this knife, you will have to part with just above 50$ from Amazon I would give it 3  stars as it needs more work to keep it rust-free. Find out more here


  • Very sharp
  • Straps hold well
  • good handle


  • The sheath needs a little bit of modification

8. Aqualung Squeeze Dive knife under $50

The Aqualung Squeeze knife has a 7.6 cm 304 stainless steel blade with a cutter. With a handle, the total length is 16.5 cm. Since divers don’t want to lose their knives,

Aqualung’s locking mechanism uses patented “squeeze lock” technology to secure the knife in the sheath. The locking mechanism removes the knife from the sheath by pushing the handle, making it easy to obtain with one hand.

The blunt tip of the pressure knife prevents damage to the equipment and self-damage. Aqualung offers a number of mounting options via holster belt clips and comes with hose mounting straps and knife washers for mounting on BC inflation hoses. Optional rubber tires are not included and can be purchased.


  • knife’s blade is made of 304 stainless steel with a blunt tip
  • Easy to secure and release knife 
  • ith squeeze lock technology 
  • easy access Blunt tip blade design


  • The user felt that the knife was not extremely sharp, even straight out of the package.

9. Cressi Predator Dive Knife under $50

The Predator is a small knife with a full tang blade that measures about 3.5 inches long. The blade is made from Japanese 420 stainless steel and should resist rust if you rinse and dry it after each use.

Cressi Predator has a serrated blade on one end and a razor-sharp on the other, making it suitable in all situations.

From everything I’ve heard, it comes equipped with a good quality sheath and comfortable leg straps.

Cressi’s Predator may not suit everyone (some think it’s too small), experts agree that it’s an excellent knife for its size.

This knife is the right choice if you like a dive knife with a slightly smaller blade or just a great backup.


  • Tried and true small knife
  • The perfect small knife
  • Handling is simple and the blade penetrates easily
  • A knife with a pointed tip
  • A straight edge or partial serration


10. Cressi Borg Dive knife under $50

Cressi Borg dive knives are among the best with a long blade that is suitable for snorkeling,

This knife is perfect for any water activities, such as fishing and swimming. The overall length is 10.43 inches and the blade is 5.51”, making it one of the larger knives on the market.

The 420 stainless steel makes it rust-resistant as well as very durable under multiple conditions.

If you want to keep your Cressi Borg, then you should always clean it after each use. When cleaning the knife, make sure that you rinse it off and dry it afterward.

If done right, this will ensure that your Cressi Borg lasts for years. The blade of the Cressi Borg has a drop point tip, and it comes with both

In addition, the Cressi Borg comes with a line cutter, which is typically not included on dive knives. Next, the handle has an ergonomic design with finger grips and a thumb tab for excellent grip.

The metal butt below the handle can be used as a tap hammer to communicate with a dive partner


  • This is an excellent place to dive, snorkel, swim, and spearfish.
  • The edges are both straight and serrated.
  • The bottom is metal and has a line cutter.
  • One-hand operation is possible with the included sheath, which includes a quick-release button.


  • There was some customer feedback that the knife guard was made of low-quality materials and would rust if it was not washed and dried thoroughly.

11. Promate scuba diving knife under $50

The Promate scuba diving snorkeling sharp Tip stainless steel knife features a stainless steel cap on the bottom handle and has a blade made from 420 series stainless steel. The sheath is quick to release and has adjustable straps. The knife is easy to maintain and clean.

After use, however, be sure to rinse thoroughly with fresh water. However, given the fact that the sheath is ribbed on the inside hence making it uncomfortable as well as rusts pretty quick, I would give it 4  stars. Find out more here 


  • Can be easily disassembled for cleaning & maintenance
  • Very high quality for the price
  • Available as blunt or point tip and in a variety of colors


  • Some find the straps uncomfortable

What is a diving knife?

A diving knife is not a weapon. It is not for killing fish,  and of course, not for cut the air hoses of your underwater enemies (you are not James Bond!). It is a general tool and safety device. It is usually made by a metal handle butt, a smooth and serrated edge blade, and a mounting Sheath.

What does a diving knife use for?

Actually, they are plenty of uses for the knife. But the most important function is to set you free when you in case entangled by something (like fishing line, nets, seaweed, etc.).

Although you wish the cases will never happen to you, there is a possibility that exists. In these cases, a diving knife can save your life.

Do I need to buy one?

As I  mentioned above, maybe you will use it once in your 1000 dives, but in the very one, it can save your life. It is just like you buy insurance but you will never have the chance to be served from it.

If I were you, I will buy this insurance, and buy one diving knife too. But if you want to dive into the big blue and meet the mermaid and Jacques, I will not stop you (I suggested you stay on the earth and enjoy the normal life…).

How to choose a good diving knife for myself?

You can buy one in the second-hand market and wish it will not be broken when you use it in the 1001 dive. Just joke. To make sure you will enjoy your 1002 dive, I suggest you choose a good one.

But since you’d better know more about which material, which shape, and which blade will be better for you, I will open another good topic to discuss more to let you make your right choice.

How To Choose The Best Dive Knife

Dive knives sometimes regarded as blades, shears, cutters, z knife, or zip knife are tools and not really weapons, thinking of a dive knife as a tool actually brings the concept into a whole new light. Basically,

a dive knife is a very important accessory of scuba diving that you will need not only to ensure your safety but also as prying, digging as well as a cutting tool while under the water,

plus dive knives can be used to untangle cords or underwater lines nets or seaweeds. Scuba dive knives or dive knives are very important underwater tools that offer versatile solutions to lots of underwater challenges.

Therefore, if you plan to do snorkeling, technical diving, wreck diving, or cave diving, one of the most important tools that you need to equip yourself with is simply a dive knife.

With so many choices of dive knives that come in different shapes and sizes in the market, it is very important to know the best dive knife tips in order to identify which diving knife is appropriate for you.

Therefore to narrow down on the best kind of dive knife that you require the following dive knife tips are necessary.

1.The tip of the knife

The tip of the blade is a very significant feature and a very important thing that one needs to consider when buying a dive knife. If for instance, you are diving for fun then you can employ a knife with a blunt tip.

Such kind of a knife can easily be mounted onto your equipment with less damage to it, secondly, there is less chance of one experiencing injuries or having accidents when diving with such a blunt tip knife. However, if you need to spear a fish then you certainly need to have a sharp knife.

2.The edge of the knife

The edge of the knife is also a very important feature that needs to be considered when acquiring a dive knife. There are two kinds of edges of a dive knife; straight and a serrated-edged dive knife.

A dive knife can either be with serrated or straight edges whereas some have a combination of both the serrated and straight edges.

A knife designed with serrated edges is useful in cutting ropes and nets while the one with the straight edge can be very important in the cutting of fishing lines.

3. The type of the material

The type of material that a dive knife is made of is also a very important tip to consider. The most common materials are used are titanium and stainless steel.

Stainless steel is considered ass less expensive however it eventually corrodes from the salty water. On the other hand, the titanium knives are lighter and more rust-resistant, plus they tend to hold their edges much longer than the other materials

4. How a particular knife is mounted

How is the dive knife designed to be mounted? Some knives are designed in such a way that you can either mount them on your leg while others can easily be mounted onto their buoyancy compensator.

The choice of where to mount your knife determines its ease of removal and it should therefore be mounted in a place that you can reach it easily with your hands.

5. The sheath of the knife

One of the features that will also determine the kind of dive knife that you purchase is the sheath of the knife. The knife’s sheath helps to protect one from the knife’s blade.

It should be designed in a way that it can easily and smoothly slide onto the knife. It is important to look for a knife with a sheath that will allow you to release it from the dive knife with just one finger.

6. The size and the shape of the knife

Depending on what purpose and functionality that you want to serve with your dive knife. The size and the shape of a dive knife will play a very significant role whether a large, medium or mini dive will determine whether a knife is practical enough, easy to manipulate, and convenient enough to use.

The shape of the knife is also a factor that will determine its choice, is it convenient to carry or is it best suited for cutting, digging, chiseling, or prying without much difficulty.

Uses of Diving Knife

There are a lot of uses of a diving knife, let’s check the most six uses one by one.

1. set you free from the entangled case

This is the very first and most important use of a diving knife. In some cases, you may get caught in fishing lines, net, or seaweed. Of course, we hope it will never happen,

but if it comes, a diving knife can slice or saw the things to set you free. A good knife offers both functions.

2. cause your buddy’s attention

In an emergency case underwater, use the metal handle butt of a diving knife bang against your tank to make noise that will travel far and fast underwater.

It is a great way to cause your buddy’s attention. In that case, your buddy comes and helps extract you, gives you air, and helps you to stay calm. This technique can literally save your life.

3. keep you stay still from the current

If you meet a sudden current nearby an underwater stone, stick your diving knife in the stone will be a way to keep you stay still and prevent the current move you far.

But before going to somewhere with often current, you should prepare well your Current Hook.

4. prevent the underwater creatures hurt you

When you are searching for some creatures that may be covered by sands or sludge, you may want to remove the sands or sludge to check.

To prevent the creatures hurt you, you can use the diving knife instead of your hand to do this job. But be careful, don’t hurt the underwater creatures.

5. measure the size of underwater creatures

Light refraction underwater can make that small shell or crab look huge. Your 5-inch diving knife will be a good tool to measure if they are what you are looking for. Again declare, careful, don’t hurt them.

6. adjusting your gauges

BTW, the sixth use is to use your blunt tip head diving knife to adjusting your gauges, of course, when you don’t have the professional tool in hand.

Besides the above-listed six uses, the diving knife still can do a lot of things. But there are also don’t uses list you should pay attention don’t hurt the underwater creatures and human being careless.

What makes a good diving knife?

Dive knives come in either titanium or stainless steel. A dive knife is one of the most important tools that you need.

What steel are dive knives made of?

The stainless steel used is either 400 or 300 series. The 300 stainless steel series is much more resistant to rust than the 400 series but it is softer.

Are dive knives legal?

All things considered, a plunge blade truly isn’t pretty much as helpful as a line shaper and a couple of shears. What’s more, no legitimate worries with those. It is useless to get some information about criminal punishments without including the purview.

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