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The Best Dive Knives of 2021

  Updated on 16 October, 2021

Handpicked
Quality-Checked
Generated From 25K+ Reviews!
Bestseller No. 1
Aqua Lung Squeeze Lock Ti Dive Knife-Charcoal-Pointed Tip
  • 304 series stainless steel or High Grade Beta Alloy Titanium
  • Patented locking mechanism securely locks knife in sheath, but releases easily with a squeeze of the handle
  • Stainless Steel “barnacle nuts” & bolts are included for mounting
  • Hose mounting straps are included for mounting
Bestseller No. 3
Scuba Choice Scuba Diving Compact Black Stainless Steel Blunt Tip BCD Knife
  • 420 Stainless Steel
  • 2.3" Blade
  • Total length: 7"
  • Moulded nylon grip for comfort
Bestseller No. 4
Promate Point Tip Scuba Dive BC Knife (3" Blade), Black
  • Small and versatile tool for diving snorkeling
  • 304 stainless steel blade
  • Single action button locking system sheath
  • Sharp at the point and one side of blade and serrated edge at another side.
Bestseller No. 5
BOffer Scuba Diving Knife,Black Tactical Sharp Blade knives,Divers dive tool with 2 Types...
  • ★Sheath for leg,arm,belt,BCD.
  • ★420C stainless steel,overall length:approx 8.5",blade length:approx 4".
  • ★Rugged diving knives,It came sharp and ready to use for snorkeling,fishing,swimming,boating,shallow scuba and cutting...
  • ★1x knife,2 x sheaths that impact-resistant ABS plastic sheath and nylon holster,4 x adjustable 3/4 inch wide straps...
Bestseller No. 6
Bahia Dive Supply Stainless Steel Diving Snorkeling Safety Knife with Quick Release Adjustable Leg...
  • Three types of blade in one! Straight edge for slicing, serrated edge for tearing and a line cutter all in one!
  • Durable 420 high-carbon stainless steel blade is easy to sharpen. Blade and sheath must be rinsed, towel dried and...
  • Quick release clips & adjustable 19 inch straps for lower leg, easy to set up and remove. Straps connect to back side of...
  • Bright green color for easy visibility! Never spend time searching for dropped knives! You & your dive buddy will be...
SaleBestseller No. 7
TUSA FK-910 X-Pert II Dive Knife, Drop Point, Cobalt Blue
  • 420 Stainless Steel blade
  • FK-910 features a drop point blade, FK-920 features a blunt tip blade
  • Newly designed ergonomic grip with counterweight
  • Includes a serrated edge plus a line cutter
SaleBestseller No. 8
TUSA FK-940 X-Ppert II Titanium Dive Knife, Metallic Silver
  • 6-4Ti (Ti-6Al-4V) highly corrosion resistant titanium drop point blade
  • Newly designed ergonomic grip with counterweight
  • Includes a serrated edge plus a line cutter
  • Single button sheath lock release
Bestseller No. 9
GEAR AID Tanu Dive and Rescue Knife with Sheath, 3” Blunt Tip Blade, Nav Green
  • Get quick access to a 304 stainless-steel knife during salt water adventures by mounting the Tanu to dive gear; its...
  • Take this multipurpose knife while diving, fishing or paddling and use the line cutter or double edge blade (straight...
  • Grab the burly, rubberized handle for a secure grip with a finger stop for added safety, or use it as a tank banger...
  • Tethering the knife to gear in case you drop it using the lanyard hole; includes a quick-draining sheath with removable...
Bestseller No. 10
5” Titanium Dive Knife with Leg Strap and Sheath - Premium Diving Knives with Serrated Edges -...
  • GET A GRIP: This sharp scuba knife has a fatter, rubberized grip than most other knives, making it feel like it was made...
  • ALLOY MATEY! Well you may have never used the phrase, “Ahoy Mate”, but we’re referring to something else here. The...
  • ALWAYS WITHIN REACH: With its’ longer straps, this titanium dive knife can easily be strapped at the thigh so it’s...
  • BANG THE TANK SLOWLY: So what do you do when you want to get your dive buddies’ attention when you’re thirty feet...

Read More About Dive Knives

Dive Knives Safety Tips

One of the first things you think of when you hear the term "Dive Knife" is the knife that a diver uses to take water samples. This is a common equipment in scuba diving schools everywhere. A diver's primary tool is a sharp little knife that has a blade that does not bend but still is capable of cutting through the tough coral polyps and other marine life. Because a diver's equipment needs to hold together with the strength of its metal and its weight, and because the knife can take a lot of abuse from diving trips, it is important that the knife be made out of the best material possible. The materials that are used for the construction of a quality dive knife are discussed below.

The material that is most commonly used for the blades of scuba diving knives is stainless steel. Stainless steel knives have the benefit of being extremely tough and durable, which makes them ideal for harsh underwater conditions. The overall performance and longevity of a scuba diving knife will all depend on what material is used to create the blade.

The two most common materials that are used to create a recurving or serrated edge on a diving knife are either titanium or carbon steel. Most titanium dive knives will have a straight edge that is parallel to the blade and slightly above the surface of the water. Some models of scuba diving knives may also feature a serrated edge, which will allow the user to cut small holes and passages in coral or other forms of the hard surface underwater. Some users prefer a combination of both the straight and serrated edge on their knife, while others only want to have the serrated edge.

Carbon steel is the backbone of most modern dive knives because it is the strongest and lightest material that can be used for the blades. The main advantage of carbon steel blades is that they are extremely tough and can last longer than titanium, stainless steel, or even gold. However, there are several disadvantages to using a carbon steel blade. The biggest disadvantage is that the edges of these knives can easily dull over time. If a person continuously uses a carbon steel dive knife with minimal sharpening, the edges will become blunt and may eventually need to be replaced. Another disadvantage of carbon steel blades is that they tend to corrode easily.

One of the best metals that can be used for the blades of scuba diving knives is nickel-titanium. This metal does not rust nor do they become dull like other metals. The primary drawback to nickel-titanium is the high cost of production. Since this metal must be processed in a special facility, the cost is significantly higher than any other materials. Because of the high production costs of this metal, many manufacturers of dive knives that use this material for the blades are unable to provide them at competitive prices.

Another problem with using a metal that corrodes easily is entanglement. Entanglement is a metal component that becomes trapped between the diver's clothing and the diver's dive knife blade. Because the entanglement can often cause great discomfort to divers, manufacturers of these dive knives have designed additional features that will prevent entanglements. These designs include grooves and slots on the knife's blades. Some also include a specially designed pocket that allows for easy access to the diver's pockets while they are in the water.

A third consideration for the makers of dive knives is whether the material being used is strong enough to prevent it from being damaged by sharpening tools. One option that manufacturers of such products have tried is to create pressurized streams of compressed air. This technique has proven to be successful in preventing corrosion of the steel blades. It also makes it easier to sharpen the edges by removing the sharpening scratches on them.

Scuba divers frequently use a scuba diving knife. Unfortunately, despite their benefits, these tools can present some danger if used incorrectly. For example, because the tip of a scuba diving knife is so small, a lot of the damage that can occur if the knife is used improperly is located very close to the handle. If a sharp edge is used on the handle, it may deflect off and strike the side of the diver's mouth, causing serious injury. A less than adequate sharpness could also result in a blunt point that will tear away from the skin.