Diving Knives

Diving Knives

Diving Knife ImageA dive knife is a crucial accessory for any experienced scuba diver. Whether used for cutting line, adjusting your gear, or spearing fish. Diving Knives are specifically designed for Divers, SCUBA Divers & Snorkelers. They use a Diver's Knife to cut lines, nets or to pry or dig. And are used for personal protection against underwater predators if needed. Many also carry a Diver's net or line cutter.

A line cutter is a small handheld tool carried by scuba divers to extricate themselves if trapped in fishing net or fishing line. It has a small sharp blade such as a replaceable scalpel blade inside the small notch. There is a small hole at the other end of the knife on the handle for a lanyard to tether the cutter to the diver. Many Diver Knives come with non-stick handles for ultimate traction, as well as sheaths that keep the knife comfortably within arm's reach. Many of the blades double as flat-head screwdrivers or other useful tools.

SCUBA / Diving Knives

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Sea Hawk Japan Scuba Diving Knife, W/ Aqua Lung US Divers Co.Knife Sheath

$69.95
End Date: Monday Dec-9-2019 12:35:55 PST
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Vintage AMF Voit Swimaster Scuba Knife With RARE Orange Handle And Sheath

$35.95
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XS Scuba Knife Wrap - Neoprene

$17.00
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IST Titanium Scuba Diving Knife

$39.95
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Scuba Deep Sea Hammerhead Blunt Tip Fixed Blade Stainless Steel Diving Knife

$16.99
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Vintage Sportsways Diving Knife with Sheath and Straps, Orange Handle - Nice!

$42.00
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Orange Wenoka Sea Scuba Diving Knife Hammer End with Sheath Z-Lock

$29.90
End Date: Friday Nov-15-2019 11:44:08 PST
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Scuba Diving Knife TOOL - Black Tactical Sharp Blade knives WATER RESCUE HUNTING

$28.58
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Scuba Max KN-200 420SS Rounded Tip Scuba Knife

$21.00
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Aquatec (Blunt Tip) Scuba Stainless Steel Diving Knife with BCD Mount KN-170SB

$26.99
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Cressi Borg Large Blade Diving Knife, High Visibility Lime Green. New in box.

$22.99
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XS Scuba FogCutter X Scuba Diving Knife - Blunt Tip

$76.95
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Vintage VALOH # 12520 Diving Knife with Sheath Made in Japan

$17.95
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Vintage ScubaPro Diving THE KNIFE” 12.5" Long with 7.75" Blade with sheath-Italy

$70.00
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Diving Knife Black Tactical Sharp Blade knives Best for Snorkeling,Hunting,Survi

$20.35
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Titanium Scuba Knife SHARP TIP 4.5 Inch Blade Scuba Dive Snorkel Buy Yes

$59.95
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Scuba Diving Knife Two Sides Line Cutter with 2Pcs Replacement Blades

$20.18
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Scuba Diving Knife Two Sides Line Cutter with 2Pcs Replacement Blades

$20.18
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AQUATEC T-Rex Titanium Scuba Knife

$59.00
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VINTAGE DIVING KNIFE, NO HOLSTER MADE IN JAPAN

$25.00
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Scuba Max KN-200 420SS Rounded Tip Scuba Knife

$21.00
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Vintage Aqua Lung US Divers 12.5 Inch Stainless Steel Scuba Knife Made in Japan

$26.99
End Date: Wednesday Nov-27-2019 20:27:13 PST
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Yellow Stainless Steel Diving Knife 11 3/4" Scuba Snorkeling Ocean Swimming Tool

$19.57
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Blackie Collins Wenoka Sea Style Scuba Knife 9165 Preowned With Sheath

$24.99
End Date: Wednesday Nov-13-2019 21:00:48 PST
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Mares Force Plus Knife for Scuba Diving, Snorkeling or Water Sports

$59.94
End Date: Thursday Nov-21-2019 22:30:18 PST
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WENOKA DIVING KNIFE WITH SHEATH 7871 JAPAN STAINLESS SCUBA SNORKELING

$15.00
End Date: Saturday Dec-7-2019 13:18:24 PST
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Scuba Max KN-200 420SS Rounded Tip Scuba Knife

$21.00
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VINTAGE SPORTSWAYS SEA DIVING KNIFE WITH SHEATH and STRAPS ORANGE HANDLE

$33.00
End Date: Tuesday Dec-10-2019 20:25:43 PST
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Wenoka Diving Knife 9091 With Sheath

$24.99
End Date: Tuesday Dec-10-2019 15:29:06 PST
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PREOWNED Wenoka Diving Scuba Knife Hot Pink w/ Matching Sheath See Photos #8635

$25.00
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Diving Knife Reviews

More About Diving Knives

Diving Knife Sizes

  • Large Dive Knives: Size is important, because a big dive knife is not always the best choice. Large dive knives can be awkward and heavy, hard to manipulate in a tight space without causing damage to yourself or your equipment. A dive knife is not often used as a weapon, and it may be best to consider the practical application of your new knife before making a purchase.
  • Medium Dive Knives: By far the most practical dive knife, a medium sized dive knife has the heft and mass you'll need without the ungainly length of some larger dive knives. Medium dive knives are convenient, and can often be strapped to a variety of easy-to-reach locations, including your BC, your arms, or your legs. The hilt is still long enough to get a firm grip, so you don't sacrifice strength for size.
  • Mini Dive Knives: For a compact profile, nothing beats a mini dive knife. With a 2-3 inch blade, a mini dive knife can fit anywhere you need it to go, including clamping it onto a hose for quick access. An important tip - make sure that the handle is longer than 2-3 inches, so that you can get a firm grip on the knife, even through thick gloves.

Blade Shape

  • Straight or Serrated: The edge of your dive knife is an important concern. If you find yourself cutting plastic more often, such as a monofilament line and nylon rope, a straight edge is going to be more useful to you. A serrated blade for your dive knife, however, is best suited for sawing at natural fibers like rope and kelp. Many blades have a straight edge on the front and a serrated edge on the back, a useful feature for a variety of situations.
  • Sharp Tip or Blunt Tip: A sharp tip is great for puncturing and cutting, and is used most often during spearfishing, including cleaning and dressing your catch. However, a sharp tip on a diving knife is inherently more dangerous, and is more likely to accidentally cut something you don't want it to. On the other hand, a blunt tip is great for prying, digging, hacking, and chiseling, and means you have to worry less about accidents that might break the tip of a sharp tip dive knife, or cause injury.
  • Line Cutting Notch: A line cutting notch is a small spur projecting from the knife, one with a sharpened interior that is perfect for hooking around a line and cutting it swiftly. A line cutting notch on a diving knife is a very useful feature.

Materials

  • Titanium: Titanium dive knives are almost completely rustproof and corrosion resistant, owing to the fact that they contain no carbon for easy oxidation. A dive knife made of titanium will hold a sharp edge for multiple dives, and greatly cuts down on maintenance time.
  • Stainless Steel: Most dive knives are made of steel; usually 300 or 400-series stainless steel alloys, with high carbon content for high tensile strength. All stainless steel dive knives will eventually show some signs of rust, due to their high carbon content. Because stainless steel knives are not completely rustproof, they will require some maintenance. It's important to rinse your dive knife with fresh water after each use, and to let it dry outside of its sheath. Coat with a light layer of oil or silicone after.
    • 300-Series Alloy: The lower the number, the more corrosion resistant the dive knife is, but the less able it is to keep a sharp edge. If you buy a 300-series alloy knife, you can spend a little less time on maintenance, but you'll have to sharpen it after a couple of uses. The convenience of a blunt-tip knife is that the sharpness is far less of a concern.
    • 400-Series Alloy: A 400-series alloy dive knife will hold an edge for longer, but is more susceptible to corrosion. It also may shatter if used as a pry bar. If you purchase a 400-series alloy knife you will need to wash and oil it after every use, but you won't have to sharpen it as often.

Features of Diving Knives

Reliable Grip

Another important aspect of a dive knife is its handle. Because you're in or around water, things tend to be slippery. Texture, shape, and material are all things to consider when selecting a dive knife. A textured handle will keep the knife firmly in your hand while its shape will make it easier to hold.

Durable Sheath

The sheath of a diving knife is important because it's the only thing that prevents your knife from sinking away into the abyss when you're not using it—which is a vast majority of the time. But when the time comes to use it, you need to know the knife will be there. A reliable sheath is one that fits properly on your body or equipment and has a sheath retainer, which is a device that prevents your knife from coming out unexpectedly. 

Fixed vs. Folding

Believe it or not, folding dive knives have made some waves in the dive knife world. Normally, we'd only recommend fixed blades because of their reliability, but the recent strides made in steels and materials make folding knives realistic options. Spyderco folding dive knives can stand up to many dive knives with fixed blades; however, they have the added convenience of taking up a smaller space and being safer to carry. 

Metal Pommel

Another feature that comes in handy when diving with a team is a metal butt on the knife. This usually comes in the form of a metal cap at the end of the handle that acts as a tap hammer, which is useful when trying to communicate.

High Visibility

Many dive knives are bright and colorful. While sharks can be attracted to bright, colorful and shiny objects, diving knives are highly susceptible to getting lost. Especially if you happen to let it go underwater. By having a handle with some vivid accents, you'll be able to spot the knife from a distance.

Lanyard Hole

Another trait you might want to consider in a diving knife is a lanyard hole. Not all dive knives come with them, but they can be convenient if you often find the knife slipping out of your hand. A lanyard around your hand will keep the knife close by.