UMH 42x9x46 [M6] / N38 - magnetic holder with hook

Advantages as well as disadvantages of rare earth magnets.

In addition to their magnetic capacity, neodymium magnets provide the following advantages:

• They do not lose magnetism, even during nearly ten years – the decrease in strength is only ~1% (theoretically),
• Neodymium magnets are distinguished by extremely resistant to loss of magnetic properties caused by external interference,
• A magnet with a metallic gold surface is more attractive,
• The surface of neodymium magnets generates a unique magnetic field – this is a distinguishing feature,
• Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their shape) at temperatures up to 230°C and above...
• Thanks to the potential of flexible molding and adaptation to unique needs, magnetic components can be modeled in a wide range of geometric configurations, which amplifies use scope,
• Huge importance in innovative solutions – they are used in data components, electric motors, medical equipment, and technologically advanced constructions.
• Thanks to concentrated force, small magnets offer high operating force, with minimal size,

Disadvantages of NdFeB magnets:

• They are prone to damage upon heavy impacts. To avoid cracks, it is worth securing magnets in a protective case. Such protection not only protects the magnet but also increases its resistance to damage
• Neodymium magnets lose power when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of power (a factor is the shape and dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are very resistant to heat
• Due to the susceptibility of magnets to corrosion in a humid environment, we recommend using waterproof magnets made of rubber, plastic or other material resistant to moisture, when using outdoors
• We suggest casing - magnetic mount, due to difficulties in realizing threads inside the magnet and complicated forms.
• Potential hazard to health – tiny shards of magnets can be dangerous, if swallowed, which becomes key in the context of child health protection. Furthermore, small components of these magnets can be problematic in diagnostics medical when they are in the body.
• Due to complex production process, their price is higher than average,

Magnetic strength at its maximum – what it depends on?

The lifting capacity listed is a theoretical maximum value performed under specific, ideal conditions:

• with the contact of a sheet made of low-carbon steel, ensuring maximum field concentration
• with a cross-section no less than 10 mm
• characterized by smoothness
• without the slightest clearance between the magnet and steel
• for force acting at a right angle (pull-off, not shear)
• in neutral thermal conditions

Determinants of practical lifting force of a magnet

During everyday use, the actual holding force results from several key aspects, ranked from most significant:

• Distance – the presence of any layer (paint, tape, air) interrupts the magnetic circuit, which lowers power rapidly (even by 50% at 0.5 mm).
• Direction of force – highest force is available only during perpendicular pulling. The force required to slide of the magnet along the plate is standardly many times lower (approx. 1/5 of the lifting capacity).
• Base massiveness – too thin plate causes magnetic saturation, causing part of the power to be wasted to the other side.
• Material composition – not every steel reacts the same. Alloy additives worsen the interaction with the magnet.
• Surface condition – ground elements guarantee perfect abutment, which improves force. Uneven metal weaken the grip.
• Thermal environment – temperature increase causes a temporary drop of force. Check the thermal limit for a given model.

* Lifting capacity testing was carried out on a smooth plate of optimal thickness, under a perpendicular pulling force, whereas under attempts to slide the magnet the load capacity is reduced by as much as fivefold. Moreover, even a slight gap {between} the magnet’s surface and the plate decreases the holding force.