Neodymium Magnet - 25mm X 10mm X 4mm - Pack Of 4
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B&Q - 25 X 10 X 4mm Thick N42 Neodymium Magnet5.4Kg Pull (Pack Of 4)
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This guide is for crafters, designers, and engineers seeking strong, compact magnetic solutions. The B&Q Neodymium Magnets offer exceptional holding power in a small form factor, ideal for precise applications. A potential caveat is their strong pull, requiring careful handling to avoid pinching.
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FAQs
What is Neodymium?
Neodymium is a rare earth element used to create very strong permanent magnets, often referred to as 'super magnets'.
How strong is this magnet?
Each magnet can support a steel weight of up to 5.4kg vertically when in flush contact with a mild steel surface.
Are these magnets waterproof?
The magnets have a triple coating of nickel, copper, and nickel which protects against corrosion, making them suitable for many environments. However, prolonged submersion in water is not recommended as it may eventually affect the coating.
Can these magnets lose their strength?
Neodymium magnets have excellent resistance to demagnetization under normal conditions. However, exposure to very high temperatures (above 80°C or 176°F) can weaken them permanently.
What precautions should I take when handling these magnets?
Handle with care to avoid pinching fingers or damaging the magnets by letting them snap together forcefully. Keep them away from sensitive electronics and magnetic media.
What does 'axially magnetised' mean?
It means the magnetic poles (North and South) are located on the two 25mm x 10mm rectangular faces of the magnet.
Can I use these magnets for children's toys?
Due to their strong magnetic force and potential to chip, these magnets are not recommended for use by young children unsupervised.
Troubleshooting
Magnet does not seem to hold as much weight as expected.
Ensure the surface it is attaching to is clean, flat, and made of a suitable ferromagnetic material (e.g., mild steel). The holding force is maximum when in flush contact with a steel plate of adequate thickness. Attempting to hold weight perpendicular to the magnetic face on a thin surface will significantly reduce the effective pull.
Magnets are difficult to separate.
Try to slide the magnets apart sideways rather than pulling directly. If they are strongly attracted, use a thin, non-magnetic material like plastic or wood to create a small gap and then carefully slide them apart.
Magnet chipped or broke.
This usually occurs when magnets snap together with significant force. Handle magnets gently and introduce them to each other slowly. Store them with protective spacers.
Pros and Cons
Pros
- Exceptional magnetic strength for their size.
- Durable triple-layer coating resists corrosion.
- High resistance to demagnetization ensures longevity.
- Versatile for both creative and technical applications.
- Compact dimensions make them easy to integrate.
Cons
- Strong magnetic pull can pose a pinching hazard if not handled carefully.
- Can attract and hold ferrous materials, requiring safe storage.
- Neodymium magnets can be brittle and may chip or break if allowed to snap together forcefully.
- Not suitable for use in environments with extreme heat, which can weaken magnetism.
- Requires careful separation to avoid damage from snapping together.
Setup, Compatibility & Care
Setup: These magnets are ready to use out of the box. Simply bring them into proximity with a ferromagnetic material (like steel) or another magnet. Due to their strong pull, it is recommended to slide them apart rather than trying to pull them directly apart, especially when they are attracted to each other or a metal surface.
Compatibility: Neodymium magnets are compatible with most common materials. However, they strongly attract ferromagnetic materials such as iron, nickel, and cobalt. Keep them away from sensitive electronic devices, magnetic storage media (like credit cards or hard drives), and pacemakers. They are compatible with woodworking, plastic, and various metals for integration into projects.
Care: To maintain their strength and appearance:
- Handle with Care: Avoid allowing magnets to snap together forcefully, as this can cause chipping or breakage.
- Clean Gently: Wipe with a soft, dry or slightly damp cloth. Avoid abrasive cleaners or solvents, which can damage the coating.
- Store Properly: Store magnets separated by plastic or cardboard spacers, or keep them in their original packaging, to prevent them from attracting each other.
- Avoid Heat: High temperatures can permanently reduce the magnetic strength. Keep them away from heat sources.