The 4 Best Dive Knives to Equip Your Underwater Adventure (2023 Reviews)

the best dive knives

Whether you’re a professional diver or a recreational snorkeling enthusiast, you’ll agree that a reliable dive knife is a critical part of your kit. As unassuming as this tool can be, it can rescue you from entanglement hazards like fishing nets or kelp. Besides their safety function, a dive knife can aid in scientific research diving by collecting small specimens.

In this roundup, we will discover the top 4 dive knives currently on the market. We’ll evaluate not just their raw cutting power, but also durability, corrosion resistance, safety features, and the usability of these products.

We understand the importance of being well-prepared underwater – where every second and every tool counts. So, stay with us as we delve deeper into the world of dive knives. Remember, owning the best dive knife could not only enhance your diving experience but also save your life in a critical situation.

The 4 Best Dive Knives According To Our Testing

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

The Promate KF510-Black is a sharp tip diving knife made from high-quality Grade 304 stainless steel, which can be easily disassembled for cleaning and maintenance. It features a stainless steel butt cap on the handle bottom and a sheath with quick-release and adjustable straps along with a lanyard hole.


  • High-quality stainless steel
  • Easy to disassemble for cleaning and maintenance
  • Lanyard hole in the handle
  • Comes with a sheath with quick-release and adjustable straps
  • Well-balanced with a good grip


  • Strap quality and assembly issues
  • Butt cap may get loose and lost if not properly secured
  • Some users reported the knife tip gets bent easily under pressure
  • Straps could be longer to allow thigh mounting

The Promate KF510-Black, sharp tip stainless steel scuba dive knife, is an efficient underwater tool owing to its high-grade stainless steel composition. Its easy disassembly adds to maintenance convenience, making it an excellent choice for those who value longevity and cleanliness in their tools.

The sheath, equipped with quick-release and adjustable straps, is accessible and, along with the lanyard hole on the handle, makes carrying and storage a breeze.

However, this promising tool has its disadvantages, the most notable of which is the strap’s quality and assembly. Many divers report that the straps can arrive backward, which requires disassembly and reassembly. In some cases, pieces of the strap have been missing, requiring improvised solutions. This is an inconvenience that could potentially be avoided with better quality control during assembly.

Another issue reported by users is the butt cap. It can become loose and go missing if not sufficiently secured by the user. This added step, while minor, adds to user responsibility and impinges on the product’s convenience score.

In terms of operative limitations, the product’s knife tip toughness falls under some criticism. Although made with high-grade stainless steel, the tip might bend when put under considerable stress. Many users thought the product felt and looked sturdy. They were surprised when the tip bent during their underwater activities.

Some users also wished the straps would allow thigh mounting because its current length may only permit arm fixing.

In conclusion, the Promate KF510 dive knife makes for a reliable companion undersea despite having some drawbacks. Its foremost selling points are the high-quality stainless steel material, the sheath with quick-release straps, and easy cleaning.

Customers should, however, be prepared for potential strap issues, and ensure that they secure the butt cap before diving. The knife’s overall utility and practicality give it its value, making it a worthy consideration for divers.

Promate Sharp Tip Titanium Dive Knife – KF593, Gray/Black, Sharp Tip

The Promate Sharp Tip Titanium Dive Knife is a durable and lightweight tool, highly valued for its strength and corrosion resistance. Skillfully crafted by scuba divers, for scuba divers, this knife comes complete with an ergonomic handle providing an excellent grip.

Its titanium build ensures a longer lifespan, even against the rigorous conditions underwater. Designed for convenience, it offers two designs – the sharp tip and the blunt tip – to meet different underwater needs.


  • Lightweight and durable due to its titanium build.
  • Effective corrosion protection.
  • Two designs (sharp tip and blunt tip) catering for varying needs.
  • Ergonomic handle ensures a firm grip.
  • Can be used for underwater signaling with its end-cap.


  • Complaints about the length of the straps provided.
  • Sheath does not securely click the knife into place.
  • Releasing the knife requires two-handed operation.
  • Sheath does not have enough belt openings.
  • Can get jammed with sand.

As a diver, I can attest to the fact that the Promate Sharp Tip Titanium Dive Knife hardly adds any weight to your gear, a testament to its lightweight design. This knife is effortlessly companionable, so much so that you could forget that you have it strapped on – which is an invaluable trait for a gear that’s expected to be at your side during all your dives.

Though lightweight, this knife’s titanium build delivers impressive durability, maintaining its look and functionality even after numerous dives. Not to mention, the corrosion protection is excellent. Simple rinse and air-drying are sufficient to keep it in splendid condition – testament to the durability and longevity that this knife offers.

Despite its many strengths, the Promate Sharp Tip Titanium Dive Knife is not without its imperfections. The main issue lies with its sheath. The knife doesn’t securely click into place and its release requires a two-handed operation, which could be a significant inconvenience in crucial moments. Another minor flaw reported is the sheath getting jammed with sand, which could hinder the knife’s quick release.

The straps provided to secure the sheath are yet another weak point. They aren’t long enough to fit around a larger thigh and are just 18″ at the largest buckle point. This could be a letdown for divers who prefer to strap the knife to their thigh. On a similar note, customers have noted that the sheath could do with more belt openings.

Regardless of the aforementioned flaws, this knife’s performance, durability, and design make it a reliable partner for your underwater adventures. With adequate care and use, this knife stands strong as a product that strikes an excellent balance between quality and cost, and is, undeniably, a valuable addition to your diving kit.

TUSA FK-940 X-Ppert II Titanium Dive Knife, Metallic Dark Red

The TUSA FK-940 X-Ppert II Titanium Dive Knife is a high-quality tool designed with Ti-6Al-4V titanium. This means it’s easily disassembled for cleaning and maintenance.


  • Made from high-quality titanium for durability and resistance to corrosion
  • Lightweight, perfect for easy handling and usage
  • Can be easily disassembled for cleaning and maintenance
  • Comes with a sheath and straps, adding to convenience
  • Has a sharp and strong point, suitable for various tasks


  • The handle material may feel cheap and may not fit a larger hand well
  • Initial sharpness of the blade might not meet expectations, requiring extra sharpening
  • The sheath’s push-button release mechanism may feel unreliable and have difficulty with sand
  • Uncomfortability of sheath and strap for some users
  • May seem overpriced to some users

Designed with the quality and precision synonymous with TUSA, the FK-940 X-Ppert II Titanium Dive Knife isn’t your ordinary diving accessory. The knife’s titanium build offers remarkable durability and corrosion resistance, even in salt-water environments – a quintessential feature for any dive knife. Its lightweight design allows for easy handling and transportation, so it doesn’t burden you while underwater.

However, the FK-940 does present a few drawbacks. The slight underside is linked to its handle; some users have reported it as somewhat cheap feeling and inadequately grippy, particularly when using a utility dive glove. This design could pose a challenge, especially to divers with larger hands.

Though it arrives with a certain degree of sharpness, many customers reported the need for additional sharpening. While this isn’t much of a hindrance given that titanium is easily sharpened, it’s something worth noting for those looking for ready-to-use sharpness out of the box.

The accompanying sheath and strap, while advantageous in principle, have reported discomfort problems for some users. The push-button release on the sheath, particularly, may feel unreliable and is liable to sand intrusion during beach entries.

Despite these drawbacks, it’s fairly evident that the FK-940 X-Ppert II Titanium Dive Knife has its strengths. From its robust construction to its easy disassembly for cleaning and maintenance, it has proved to be a favorite among diving enthusiasts. It fits nicely in the realm of lightweight, multi-purpose dive knives.

However, be prepared to look past minor discomforts and possibly dig slightly deeper into your pocket than initially expected. Taking into consideration its overall performance and quality, the FK-940 X-Ppert II Dive Knife may still be a good addition to your diving gear.

Atomic Aquatics Ti6 Titanium Durable Corrosion-Resistant Dive Knife with Lockable Sheath and Quick-Adjust Straps for Scuba Diving, Snorkeling – Blunt Tip

The Atomic Aquatics Ti6 Titanium Dive Knife is a full-tang knife built to solve one of the biggest problems faced by divers: the issue of corrosion. Elegantly designed, it features a curved four-inch blade with a large line-cutting notch and a serrated edge.

The knife comes in a lightweight sheath with push-button release and quick-adjust straps, and it’s available with either a blunt or pointed tip. It’s a product that merges functionality and style, underlining Atomic Aquatic’s commitment to meeting the diver’s needs without sacrificing aesthetics.


  • Corrosion-resistant full-tang Titanium blade
  • Secure grip with molded handle and finger grooves
  • Quick-adjust sheath straps
  • Comes with a lockable sheath for safety
  • Has a blunt tip for added safety


  • Blade sharpness might need improvement
  • Handle straps could be difficult to adjust
  • More expensive than other options

The Atomic Aquatics Ti6 Titanium Dive Knife is a winner when it comes to durability. Made up of a corrosion-resistant full-tang Titanium blade, the knife stands up against the brutal conditions of saltwater use, with no signs of rust even after multiple dives. Furthermore, the secure grip crafted with molded handle and finger grooves made handling much easier, even for those diving in thick mitts.

One key feature that truly sets this knife apart is the quick-adjust sheath straps. It was extremely easy to adjust for a proper fit, even while in water, and it also stays firm during intense diving sessions. The added feature of a lockable sheath enhances safety as it ensures your knife stays in place when not in use.

However, there’s always room for improvement. Some users mentioned the blade sharpness could be improved. It’s important to note that while Titanium knives are incredibly durable, they may not be as sharp as their steel counterparts. This slight setback can be overlooked when you consider the unparalleled durability it offers.

Next, while the quick-adjust straps were a hit, some users had difficulty adjusting the handle straps. Despite this, many mentioned they did not find this to be a significant issue that would affect their overall diving experience.

Finally, the Atomic Aquatics Ti6 Titanium Knife can be a bit pricey compared to other dive knives in the market. However, given its top-notch features and robust build, it certainly justifies the price tag and offers good value for money.

In conclusion, the Atomic Aquatics Ti6 Titanium Dive Knife is a reliable, corrosion-resistant knife that doesn’t compromise on safety and functionality. Despite minor cons, it continues to serve as an excellent companion to many divers venturing into the deep blue.

Dive Knife Buying Guide and Information

Understanding Dive Knives

Dive knives are an essential tool for any diver – beginner or professional. Not typically used as a ‘weapon,’ a diver uses them as a Safety tool And for practical purposes while underwater.

Uses of Dive Knives

  • Cutting entanglements: This is the most critical use of the dive knife. Divers can inadvertently get tangled in fishing lines, kelp, or net underwater. At such times, having a sharp knife to quickly cut themselves free is invaluable.
  • Tapping on tanks: Divers communicate underwater by making tapping sounds on their diving tanks. Dive knives often feature a blunt edge ideal for this purpose specifically.
  • General utility tool: A dive knife can also come handy for various tasks such as prying objects, digging, or cutting small objects as part of an exploration.

Dive knives come in different shapes, sizes, and materials to cater to the diver’s needs. The type of a dive knife you choose will depend on the diving environment and personal preference.

Type of KnifeDescription
Fixed BladeA knife that can’t fold away. It’s typically larger, more durable, and better for heavy-duty divers.
Folding BladeThis type of knife folds away making it compact, less likely to cause injury, and ideal for light-duty divers.

As divers, it’s important to remember that, while the dive knife is a critical safety tool, it needs to be handled responsibly. Divers should have proper training on how to safely deploy and use a dive knife, just like any other piece of diving equipment.

Types of Dive Knives

There are various types of dive knives available on the market, each with its own unique set of advantages and disadvantages. Let’s take a deep dive into understanding them better.

Fixed Blade Knives

Fixed blade knives have a single, solid piece of metal that runs from the tip of the blade right through the handle. The blade doesn’t fold away. These knives are usually larger, sturdier, and designed for heavy-duty use.


  • Durability: These knives are exceptionally long-lasting due to their solid construction.
  • Versatility: They excel in dealing with a variety of underwater tasks.
  • Swift access: As there’s no folding mechanism involved, you can quickly access the knife when in need.


  • Bulky: Their larger size can make them feel bulky.
  • Potential safety risk: A fixed blade knife can be more dangerous if not handled properly.

Folding Knives

As the name suggests, folding knives feature a blade that can be folded into the handle, making the knife compact. This style is more portable and generally safer due to the ability to hide the blade when not in use.


  • Compact: Folding knives are typically smaller and take up less space in your gear.
  • Safety: The foldable blade is less likely to cause accidental injury.
  • Lightweight: These knives are ideal for light-duty diving.


  • Not as durable: They may not be as durable as fixed blade knives.
  • Slow access: Unfolding the knife may take extra time, which can be crucial in emergency situations.

In deciding between the two types, consider your diving environment and needs. For example, if you’re diving in a complex environment like a wreck or cave, you may find a sturdy fixed blade knife more suitable. On the other hand, for casual or recreational diving, a compact and safe folding knife may suffice.

Remember, your knife is a tool to aid in your safety and diving experience, so choose the type of dive knife that’s Right for you.

Key Features to Consider

When deciding on the perfect dive knife, several essential features should be taken into account to ensure you are making a well-informed choice.

Blade Material

The blade material is perhaps the most significant aspect to consider. Dive knives are mainly made from two materials:

  • Stainless Steel: This is a popular choice due to its resistance to rust. However, stainless steel blades may require regular sharpening to maintain their edge.
  • Titanium: If durability and resistance to corrosion is a key feature for you, then Titanium is the way to go. Although more costly than steel, Titanium blades hold their edge longer and are virtually impervious to rust.

Blade Design

The design of the blade impacts its functionality. There are typically two types:

  • Straight Edge: If your primary use would be to cut line or net, a straight edge is ideal.
  • Serrated Edge: For tougher tasks such as cutting through thick rope or fish netting, a serrated edge is better.

Size and Blade Tip

Size plays a pivotal role in ease of handling and storage. Smaller knives with a blade length of 4 to 5 inches are more manageable and less likely to get in your way. In terms of blade tip, a pointed tip is ideal for potential spearing while a blunt tip minimizes chances of accidental injury.

Handle Design

Handle design affects the grip. A poorly designed handle not only makes the knife hard to hold but also increases the risk of accidents. Look for handles that are comfortable in your hand, have a thumb guard, and are slip resistant.

Knife Sheath and Attachment

An ideal dive knife comes with a secure sheath with a locking mechanism to prevent the knife from accidentally falling out. Also, consider how the knife attaches to your gear – options such as leg straps, belt clips, or lanyard holes provide flexibility.

To summarize, the best dive knife for you depends on your needs and preferences. However, evaluate all the mentioned features before deciding on one.

Maintenance of Dive Knives

Proper maintenance is integral in extending the lifespan of your dive knife and ensuring its efficient performance. Here are a few tips you should follow:


Regardless of the material of your dive knife, it’s crucial to clean it after each dive. Even though stainless steel and titanium are resistant to rust, saltwater can still corrode them over time. The process involves:

  1. Rinse your knife with fresh water. Ensure you clean off any debris that may have collected during your dive.
  2. Dry the knife thoroughly. Small droplets of water left on the metal can cause rust spots to form.


Lightly oiling your knife can provide an additional level of protection against rust and corrosion, especially for dive knives made of stainless steel. It will also keep the knife operating smoothly.

  • Use a silicone-based oil designed for dive equipment for best results. Apply a thin layer to the blade and the moving parts.


Store your dive knife in a dry and cool place. Ensure the knife is completely dry before storing it. If the knife comes with a sheath, it’s best to store the knife and sheath separately to prevent any moisture from becoming trapped and causing corrosion.


Regularly inspect your dive knife for signs of wear or damage. Check for:

  • Dull blade
  • Loose handle
  • Rust spots

If you find any issues, address them immediately to prevent further damage.

Remember, a properly maintained dive knife is not just about longevity, but it also ensures safety and efficiency during your dive.

Safety Precautions

While dive knives are essential tools for any diver, they still need to be handled with care. Below are several safety precautions to follow to ensure a safe diving experience.

Proper Handling

A dive knife is not a toy. When handling your dive knife, always:

  • Ensure you have a firm grip on the handle
  • Point it away from yourself and others
  • Do not use the knife for prying. It can cause breakage and potentially dangerous situations.


Regular maintenance is key to maintaining the safety and longevity of your dive knife:

  • Clean your dive knife after each use to prevent corrosion
  • Sharpen your knife regularly, but avoid making it too sharp as it could lead to unwanted injuries
  • Always dry your knife thoroughly after cleaning to prevent rusting

Knife Storage

Storing your knife properly is important for both travel and diving:

  • Ensure your dive knife is securely sheathed when not in use to avoid accidental harm
  • During a dive, secure your knife in an easy-to-reach area, but in a place where it won’t get caught on anything or accidentally injure you or your fellow divers

Consider the Environment

Always remember the environment you’re diving in.

  • Avoid harming marine life and reefs with your knife
  • Take only pictures, leave only bubbles

Moreover, remember that every diver has a role in preserving the ocean ecosystem. By applying these precautions, not only will you ensure your safety, but you’ll also make a positive impact on the preservation of our oceans. Safety begins with you. Happy diving!

Frequently Asked Questions

What is a dive knife and why is it important for divers?

A dive knife is a crucial tool for diving that serves many purposes including protecting against underwater threats, cutting through entangled fishing lines or nets, and even signaling for attention by hitting it against the tank. It ensures safety and convenience during a dive.

How can I maintain my dive knife to increase its lifespan?

After each dive, rinse your dive knife thoroughly in fresh water to remove any salt and particles that can cause corrosion. Dry it completely before storing. For stainless steel knives, you may occasionally need to oil the blade to prevent rust.

What features should I look for in a dive knife?

You should look for features such as a comfortable grip, a sharp pointed or blunt tip as per your need, a serrated edge for cutting through hard materials, a line cutting notch for fishing lines or nets, and a handle with a hammer end can be beneficial.

Is the size of a dive knife important?

Yes, the size of a dive knife is important. A knife that fits comfortably in your hand will ensure good control during use underwater. Most divers prefer a smaller, compact knife as it is easy to handle and can be conveniently attached to their dive gear.

Can I carry the dive knife on a plane?

Generally, you cannot carry a dive knife in your carry-on luggage due to airline regulations. You can pack it in your checked luggage, but it is highly recommended to check with specific airlines before doing so to avoid complications.

Should I choose a fixed or folding dive knife?

A fixed knife offers more strength when dealing with tough materials. A folding knife, on the other hand, is safer to carry and stow away. It mostly comes down to personal preference and the specific tasks you’ll be using the knife for during your dives.

What materials are best for a dive knife?

The best dive knives are made from either stainless steel or titanium. Titanium knives are more resistant to corrosion, lighter, and require less maintenance compared to stainless steel knives. However, stainless steel knives are more sharp and durable, but require regular cleaning and drying to prevent rusting.

What are the different types of dive knives?

Dive knives mainly come in three types: Fixed blade dive knives, folding dive knives, and replaceable blade dive knives. Fixed blade knives are considered more reliable due to their strength, folding knives offer portability, and replaceable blade knives are practical as you can switch out dull or damaged blades.

How to choose a dive knife based on size and design?

The size of the dive knife depends on your personal preference and the nature of your dive. Smaller knives are easier to carry and suit recreational divers, while larger knives are preferred by professional divers for heavy-duty use. For design, look for features like a serrated edge for cutting ropes, a sharp point for potential predatory protection, and a sturdy handle for grip.

What safety features should I look for in a dive knife?

Choose a dive knife with a sheath for safe storage and easy accessibility, a bright colored or reflective handle for easy visibility underwater, and a locking mechanism in the sheath to prevent the knife from accidentally slipping out. Always ensure the knife has a sturdy and ergonomic grip to prevent slipping.

Rules on carrying a dive knife vary by country, state, and sometimes even the specific diving site. It’s always advisable to check local regulations before carrying a dive knife. Some places may have restrictions on blade length or type, and in some cases, you might require a diving permit that explicitly allows the carrying of dive knives.

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