A 20×5 mm neodymium magnet (20 mm diameter, 5 mm thick) is a compact but very powerful rare-earth magnet made from neodymium–iron–boron (NdFeB). Despite its small size, it can exert surprisingly strong force, which makes it useful across many fields. Here’s a deeper look at its uses, properties, and considerations.
High magnetic strength: Much stronger than ferrite or ceramic magnets
- Compact size: High القوة-to-size ratio
- Brittle material: Can chip or crack if mishandled
- Corrosion-prone: Usually coated (nickel, zinc, epoxy)
- Temperature sensitivity: Strength drops at high temperatures (~80°C typical limit)
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