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B&Q£15.99Visit shop - Neodymium Magnet For EngineeringManufacturing And Technology Applications40mm O.d. X 25mm I.d. X 5mm Thick20Kg Pull
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This guide is for engineers, hobbyists, and educators working with magnetic components or demonstrating physical principles. The key benefit is the strong, reliable holding power and versatility for various applications, from everyday appliances to classroom experiments. A potential caveat is the need for careful handling due to the magnet's strength. This product is a high-performance neodymium ring magnet, measuring 40mm outer diameter, 25mm inner diameter, and 5mm thick, capable of supporting up to 20kg. It features a triple-layer nickel-copper-nickel coating for corrosion resistance and a smooth finish, offering excellent resistance to demagnetization.
| Brand | FIRST4MAGNETS |
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Neodymium magnets are the strongest type of permanent magnets commercially available, offering a very high magnetic field strength for their size and weight.
Store magnets separated by plastic or wood, or with 'keepers' (steel pieces that bridge the poles). This prevents them from attracting each other, which can cause chipping or shattering.
The nickel-copper-nickel coating provides good corrosion resistance, making them suitable for many environments. However, prolonged exposure to moisture or harsh chemicals without protection can eventually lead to corrosion.
Keep them away from credit cards, pacemakers, and other sensitive electronics. Handle with care to avoid pinching fingers, as the strong attraction can cause injury. Keep them away from children.
Neodymium magnets have excellent resistance to demagnetization under normal conditions. Their strength will not significantly decrease unless exposed to high temperatures (above 80°C/176°F), strong opposing magnetic fields, or physical damage.
The '20kg pull' is the maximum force required to pull the magnet directly away from a thick steel plate under ideal conditions (flush contact). Actual holding force in real-world applications will vary.
No, standard neodymium magnets like these typically lose their magnetic properties when heated above 80°C (176°F). For higher temperatures, special high-temperature resistant magnets are required.
Ensure the contact surface is clean, flat, and made of mild steel. Verify the 20kg pull rating is measured under ideal, flush contact conditions. The weight capacity decreases significantly with distance or non-ideal contact.
Inspect for chips or scratches. Minor cosmetic damage usually does not affect magnetic performance, but significant damage may indicate potential for corrosion. Handle with care to prevent further damage.
Strong magnets can attract ferromagnetic materials from a distance. Keep the magnet isolated from other metal objects when not in use, or store it with a keeper (a piece of steel that bridges the poles) to contain its magnetic field.
Setup: These magnets are designed for integration into existing systems or for direct application. Ensure the surfaces they attach to are clean and made of ferromagnetic material (like steel) for maximum holding power. When handling, keep them away from sensitive electronics. If using multiple magnets, be aware of their strong attraction to each other; allow them to attract gently to avoid damage.
Compatibility: The 25mm inner diameter allows for placement around shafts or cylindrical components. Its 5mm thickness makes it suitable for applications with limited space. Compatibility is high with mild steel surfaces for pull force applications. Avoid contact with materials that can be damaged by strong magnetic fields.
Care: Clean the magnet with a dry or slightly damp cloth. Avoid harsh chemicals or abrasive materials that could damage the coating. Store magnets separately or with keepers to prevent them from sticking to each other and potentially chipping. Keep away from heat sources above 80°C (176°F), as high temperatures can permanently weaken neodymium magnets.
