Dive Knives and Cutters

Start with what you need to cut, then compare the blade and handle. A compact line cutter and a full-size dive knife are different tools. Check the listed cutting edge and intended use rather than choosing by blade length alone.

Compare the knives shown above

• Aqualung Argonaut Titanium: a chisel tip, serrated edge and paracord-wrapped handle. Its Kydex sheath comes with two rubber leg straps.
• TUSA FK940 X-Pert II Titanium: a drop-point blade with a serrated edge and line cutter. Compare its single-button sheath release and adjustable straps.
• Cressi Borg: a stainless steel knife with straight and serrated edges. A thumb guard separates the grip from the blade.

For a compact alternative, compare the Cressi Line Cutter and HQ Diving Dual Safety Line Cutter. Check the blade, holder and mounting details on the exact listing.

A knife is only useful if you can reach and release it. Compare the sheath lock, grip and mounting position with your usual gloves and equipment.

• Check what is supplied. Some models include leg straps; mounting plates and replacement straps may be separate products.
• Match any mounting plate to the exact knife and BCD. A plate made for one knife is not automatically compatible with another.
• Check that you can release and replace the tool while keeping it clear of hoses, buckles and weight releases.
• Inspect the sheath lock and straps before each dive. Follow the maker’s instructions for fitting and retention.

The Argonaut, FK940 and Borg use different sheath designs. Compare the release action as well as the blade before deciding.

Titanium and stainless steel still need care after salt-water use. Rinse the blade, handle, sheath and straps with fresh water, then dry them fully before storage.

Check the cutting edge, sheath lock and mounting parts for wear or damage. Clear sand and salt from the retention mechanism so you can check that it works properly.

Follow the exact model’s instructions for cleaning, lubrication, sharpening and any disassembly. The FK940 can be taken apart for cleaning; use its instructions rather than applying that procedure to every knife.

Store the tool as directed, with the edge protected. Need help comparing models or mounting parts? Ask our Hallam team, or browse the wider Dive Gear range.