Human beings are at quite a disadvantage in the water, and it is very easy to be caught in a life or death situation if one is not properly equipped for it. A reliable dive knife is invaluable if you find yourself snared by a fishing net or rope, or if there are potential predators nearby. Knowing that your trusty knife is within arms reach and ready to be used will give divers of all levels some peace of mind.
With that said, there are many models on the market at various price ranges. For some, money is no object when it comes to buying equipment that can literally save their life. However, not everyone has that luxury, and especially for those starting out there are affordable options that can get the job done as well.
In this review, we are on a quest to discover the best dive knife under $50 so that even those on a budget can enjoy their hobby knowing that they are prepared for the worst.
What to Look for in a Dive Knife
There are a few major things you should keep in mind when shopping for a dive knife. The material used in the blade and handle is important, as is the knife type and size. Before we get into the reviews, let’s discuss each factor in more detail.
There are two dive knife blade materials to choose from: titanium and stainless steel.
Both have their advantages, however titanium is typically more expensive and stainless steel is the budget option. Whichever material you prefer, you must determine if the blade can hold an edge for a long time, is durable enough to prevent breaking, and resistant enough to avoid corrosion.
Titanium: We believe this is the better of the two materials. Titanium knives are more durable and better at resisting corrosion which is exactly what you need in a blade. One disadvantage is that because they are so strong, sharpening them is more difficult. But, they are lighter than steel and have such good edge retention so this won’t be something you have to worry about for a long time.
Stainless Steel: Blades made from stainless steel are more susceptible to corrosion. If you buy one with a higher carbon count it will resist corrosion better, but will be tougher to sharpen. You must take great care of your blade to keep it from rusting. Rinse both the blade and handle in freshwater, dry it, and coat the blade with oil or grease for extra protection.
There are three types of blade edge to consider: straight, serrated, or both. Serrated blades are more effective at cutting tough material like seaweed or rope because their “teeth” can chew through them when used in a sawing motion. Straight blades are better for cutting lines and plastic. Get the best of both worlds with a partially serrated edge.
Dive knives can have a sharp tip or blunt tip. Blunt tips are recommended for recreational diving because they are so versatile. You can ease them as screwdrivers or for prying things loose and never have to worry about stabbing yourself or poking your gear full of holes.
Sharp tips are the preferred choice for spearfishers and those who actually want to puncture something. Just be wary that you can accidentally injure yourself.
The length of diving knife blades typically run between 3 to 6 inches. There are bigger knives but they are more uncomfortable to carry around and might get in the way. The reality is, a smaller dive knife is easier to carry and harness while diving. They can also cut just as well as larger dive knives and are generally more versatile.
With that said, larger knives can afford to have a more comfortable handle. If you are a big guy with large hands or intend on cutting hundreds of feet of line, then you’ll soon realize that a smaller knife with a smaller handle would have been hell to use for that purpose.
Folding knives take up less space and can fit in your pocket, generally with a clip so it won’t fall out. Otherwise, blades will come with a sheath that can attach to your leg with straps. Some knives can be carried around your waist, arm, or attached to your BCD. Great care must be taken to avoid snagging it on passing environment, line, or your other equipment. The sheath must have a mechanism to allow the knife to be drawn easily, but firmly held in place when not in use.
If you are in the market for a dive knife for spearfishing, then you want a knife made to dispatch speared fish. To do this, the blade must cut well but the knife must have tools for freeing or repairing spear points.
You may want a knife that can be used for prying, sawing, or heavy pounding. In this case, you need a knife that is durable and strong, with a thick blade, excellent grip, and a hammer on the butt end of the handle.
If all you need is a knife for emergency use, such as to cut entanglements like kelp, fishing lines, and rope, then a compact knife that can be easily accessed will get the job done.
With that said, you may need multiple knives or you may just need a single reliable one; it very much depends on how you want to use your tools.
Best Dive Knife Under $50 Reviewed
Made of Japanese 420 stainless steel, the Cressi Skorpion is a medium-length knife with a durable blade. The blade measures in at 4 ⅜ in. or 11 cm, with the total length including handle measuring in at 9 ⅛ in. (23.20 cm).
The Skorpion features a stainless steel blade with a straight-edge on one end, with a serrated edge and wire cutter on the other side. You can get it in both pointed and blunt tip, and both are sharp and very effective at line cutting.
The included sheath has a locking mechanism which will keep the sheath safely on the blade, but it can also be released with just one-hand and a push of the polymer thumb tab. Two standard issue straps help connect the sheath to your leg.
Some users have reported that the knife tang (not the blade itself) has a tendency to rust on the surface level only. Make sure to thoroughly rinse with freshwater before storing.
- Blunt tip or pointed tip available.
- Has both a straight-edged and serrated edge, with wirecutter included.
- Locking mechanism keeps sheath in place and can be easily released with one hand
- Knife tang rusts easily if not properly rinsed.
Aqualung Squeeze Knife
The Aqualung Squeeze Knife features a 3” (7.6 cm) 304 stainless steel blade with line cutter. With the handle included, the total length is 6.5” (16.5 cm). A diver never wants to lose their knife, and that is why the locking mechanism for the Aqualung sports their patented “Squeeze lock” technology to ensure the knife stays secure in the sheath.
Accessing it with one hand is easy because with just a squeeze of the handle, the locking mechanism releases the knife from the sheath. The blunt tip of the Squeeze knife will prevent any self-injury or gear from being damaged.
The Aqualung provides numerous mounting options through the belt clip on the sheath, with included hose mounting straps and knife grommets for mounting on the BC inflator hose. You can also purchase optional rubber leg straps, as these are not included.
- Squeeze lock technology secures and releases knife easily
- Can be mounted on BC for easy access
- 304 stainless steel blade
- Blunt tip
- One user felt that the knife was not very sharp, even fresh out of the package.
Promate KF-510 Sharp Tip Stainless Steel Dive Knife
The Promate Barracuda KF-510 features a grade 304 stainless steel blade and can be disassembled for easier cleaning and maintenance. The stainless steel butt cap beneath the handle can be used for hammering or getting the attention of other divers.
The lanyard hole located on the handle provides an easy way to carry the knife with you. Adjustable straps provide a tighter fit, and the sheath features a one-hand quick release. Users have found that the KF-510 is very sharp and sturdy.
- Sharp 304 stainless steel blade
- Quick release sheath
- Butt cap located beneath handle
- Can be disassembled for easy maintenance
- Straps can dig into your legs
- One user reported having issues with comfort when holding the knife
Promate Titanium Blade Dive Knife
The titanium blade of the Promate dive knife measures in at 4.45” (11.3 cm) and has a total length of 9.45” (24 cm). It is corrosion and stain resistant, featuring a straight edge full tang blade on one side, and on the other side it has a serrated edge with line cutter.
The knife handle is ergonomic; the durable rubber handle with finger ridges will provide the grip you need no matter the situation. Beneath the handle is a titanium butt which can be used for hammering or as a tank banger to communicate underwater.
You can get the knife blade with a drop point or blunt tip. The blunt tip adds versatility since it can also double as a screwdriver. The sheath is made from a high quality styrene plastic with a double button push release mechanism. This knife comes included with 2 corrosion resistant rubber leg straps to secure your blade on.
- Both a straight and serrated edge with line cutter
- Titanium blade is highly durable and sharp
- Blunt or drop point tip
- Titanium butt for hammering or signaling
- Light weight
- Some users had issues with the locking mechanism jamming if grains of sand make their way inside, however others disagreed.
You don’t want to be caught underwater without a trusty dive knife to get you out of entanglements. The best dive knife should be easily accessible, with a sharp edge to slice through lines, kelp, or other such dangers.
Proper maintenance of your dive knife is crucial in keeping its longevity. After every dive, make sure to rinse both the blade and handle thoroughly with freshwater. Apply some oil or grease for extra protection. If you do this each time, you should not notice any rust or corrosion which would quickly degrade the quality of your knife.