HH 16x5.3 [M3] / N38 - through hole magnetic holder

Advantages and disadvantages of NdFeB magnets.

Besides their magnetic performance, neodymium magnets are valued for these benefits:

• Their power remains stable, and after approximately 10 years it decreases only by ~1% (according to research),
• They are noted for resistance to demagnetization induced by external disturbances,
• In other words, due to the metallic layer of silver, the element looks attractive,
• Neodymium magnets create maximum magnetic induction on a contact point, which ensures high operational effectiveness,
• Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
• Thanks to modularity in forming and the ability to adapt to client solutions,
• Versatile presence in future technologies – they are commonly used in hard drives, drive modules, advanced medical instruments, and complex engineering applications.
• Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in compact dimensions, which enables their usage in small systems

Disadvantages of neodymium magnets:

• To avoid cracks upon strong impacts, we suggest using special steel holders. Such a solution secures the magnet and simultaneously increases its durability.
• We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
• Magnets exposed to a humid environment can corrode. Therefore when using outdoors, we suggest using waterproof magnets made of rubber, plastic or other material protecting against moisture
• We suggest casing - magnetic mount, due to difficulties in creating nuts inside the magnet and complex shapes.
• Potential hazard to health – tiny shards of magnets are risky, in case of ingestion, which gains importance in the aspect of protecting the youngest. Furthermore, tiny parts of these products can disrupt the diagnostic process medical when they are in the body.
• High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which can limit application in large quantities

Maximum holding power of the magnet – what affects it?

Information about lifting capacity is the result of a measurement for ideal contact conditions, assuming:

• on a plate made of structural steel, perfectly concentrating the magnetic field
• possessing a massiveness of min. 10 mm to avoid saturation
• with a plane perfectly flat
• with direct contact (no impurities)
• during pulling in a direction perpendicular to the plane
• at temperature approx. 20 degrees Celsius

Practical lifting capacity: influencing factors

In practice, the actual holding force is determined by several key aspects, listed from the most important:

• Distance (between the magnet and the plate), since even a tiny distance (e.g. 0.5 mm) leads to a drastic drop in lifting capacity by up to 50% (this also applies to paint, rust or dirt).
• Pull-off angle – note that the magnet holds strongest perpendicularly. Under sliding down, the capacity drops significantly, often to levels of 20-30% of the nominal value.
• Substrate thickness – for full efficiency, the steel must be adequately massive. Paper-thin metal restricts the lifting capacity (the magnet "punches through" it).
• Steel type – low-carbon steel gives the best results. Alloy admixtures reduce magnetic properties and holding force.
• Plate texture – smooth surfaces ensure maximum contact, which improves force. Uneven metal weaken the grip.
• Thermal environment – heating the magnet causes a temporary drop of force. Check the thermal limit for a given model.

* Lifting capacity testing was performed on a smooth plate of optimal thickness, under perpendicular forces, whereas under parallel forces the lifting capacity is smaller. Moreover, even a slight gap {between} the magnet’s surface and the plate lowers the load capacity.