5 Essential Safety Rules for Working with Strong Neodymium Magnets Underwater

Rule 1: Control the Approach — Always Attach at an Angle

The most common mistake with strong magnets is allowing uncontrolled contact with a ferromagnetic surface. A 500 kg pull force magnet accelerating toward a steel hull can cause serious injury and damage both the magnet and the structure.

Correct procedure:

1. Ensure the target surface is clean and free of obstructions
2. Hold the magnet at a 45° angle to the surface
3. Place the edge of the pot housing against the target area first
4. Slowly rotate the handle downward, maintaining control as the full face engages
5. Verify the magnet face is flush and in full contact before applying any load

This controlled approach prevents the violent snap-on that occurs when a magnet is brought face-first toward steel. Even a Diver Magnet - 115 has enough force to trap fingers or damage dive gloves if contact is uncontrolled.

Rule 2: Respect the Pinch Hazard

The pinch hazard is the most serious day-to-day risk when working with neodymium diving magnets. When a strong magnet accelerates toward a metal surface, anything caught between them — fingers, skin, equipment, cables — will be crushed with the full rated pull force.

Prevention measures:

• Never place fingers between the magnet face and a ferromagnetic surface
• Wear heavy-duty dive gloves rated for the forces involved
• Keep the magnet secured and away from your body when swimming near steel structures
• Be aware that the magnetic field extends several centimetres beyond the magnet face — approach distance is critical

With higher-force models like the Diver Magnet - 320 to Diver Magnet - 500, the risk is proportionally greater. These magnets can cause crush injuries through heavy diving gloves.

Rule 3: Protect Sensitive Equipment

Strong magnetic fields interfere with and can permanently damage electronic equipment commonly carried by commercial divers:

• Dive computers: Magnetic fields can corrupt sensors and stored data
• Compasses: Will give false readings and may be permanently re-magnetised
• Underwater cameras: Image sensors and storage media are vulnerable
• Communication equipment: Magnetic fields can interfere with through-water comms
• Credit cards and magnetic media: Destroyed on contact

Safe distance: Keep magnets at least 30 cm (12 inches) from any sensitive electronic device. When stored topside, place magnets in a designated area away from electronics, navigation equipment, and medical devices (especially pacemakers and insulin pumps).

Rule 4: Always Use a Lanyard

A dropped magnet underwater can be difficult or impossible to recover — and a magnetised tool falling toward a steel structure is a hazard to anyone nearby. Every diving magnet must be secured with a lanyard at all times.

Lanyard best practices:

• Attach a carabiner or rated shackle to the 316 stainless steel eye nut
• Clip the other end to a D-ring on your harness or tool belt
• Use only hardware rated for the weight and force of your magnet — no plastic clips
• For optimal safety, use our purpose-designed Diver Magnet Lanyard
• Inspect lanyard and attachment hardware before every dive

Rule 5: Never Use a Magnet as Lifting Gear

Diving magnets are designed for personal anchoring and tool holding — not for lifting, rigging, or suspending loads. Critical differences between a diving magnet and certified lifting equipment include:

• No safety certification: Diving magnets are not tested or certified for lifting operations
• Surface-dependent: Pull force varies dramatically with surface condition, and sudden detachment is possible
• No failsafe: Magnetic holding has no secondary retention mechanism
• Dynamic loading: Shock loads from swinging or dropped objects can exceed the rated pull force

If you need to lift or rig loads underwater, use certified lifting equipment. Diving magnets are for personal positioning, tool holding, and equipment staging only.

Additional Safety Resources

For comprehensive handling and maintenance guidelines, see our FAQ page. For information on how coatings protect your magnet and extend its lifespan, read our guide on subsea magnet coatings. To choose the right magnet for your operation, visit our buying guide.