KM HF - 22 kg - magnetic bracket

Advantages as well as disadvantages of NdFeB magnets.

Besides their tremendous field intensity, neodymium magnets offer the following advantages:

• Their power remains stable, and after around ten years it drops only by ~1% (theoretically),
• They have excellent resistance to weakening of magnetic properties as a result of external magnetic sources,
• Thanks to the reflective finish, the surface of nickel, gold, or silver gives an professional appearance,
• Neodymium magnets ensure maximum magnetic induction on a small area, which increases force concentration,
• 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...
• In view of the ability of accurate forming and adaptation to unique needs, magnetic components can be produced in a variety of shapes and sizes, which makes them more universal,
• Wide application in future technologies – they are utilized in data components, brushless drives, medical devices, also modern systems.
• Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Disadvantages of neodymium magnets:

• To avoid cracks upon strong impacts, we recommend using special steel holders. Such a solution secures the magnet and simultaneously increases its durability.
• When exposed to high temperature, neodymium magnets experience a drop in strength. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
• Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material stable to moisture, when using outdoors
• We suggest casing - magnetic mechanism, due to difficulties in realizing nuts inside the magnet and complex shapes.
• Health risk to health – tiny shards of magnets can be dangerous, when accidentally swallowed, which becomes key in the aspect of protecting the youngest. Additionally, small components of these devices are able to complicate diagnosis medical after entering the body.
• High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which increases costs of application in large quantities

Maximum holding power of the magnet – what affects it?

The load parameter shown represents the limit force, recorded under laboratory conditions, meaning:

• with the contact of a sheet made of special test steel, ensuring full magnetic saturation
• with a thickness of at least 10 mm
• with a plane free of scratches
• with total lack of distance (no paint)
• for force acting at a right angle (in the magnet axis)
• at room temperature

What influences lifting capacity in practice

Please note that the working load will differ depending on the following factors, starting with the most relevant:

• Air gap (betwixt the magnet and the metal), because even a very small distance (e.g. 0.5 mm) results in a reduction in force by up to 50% (this also applies to varnish, rust or debris).
• Angle of force application – highest force is available only during pulling at a 90° angle. The force required to slide of the magnet along the surface is usually many times smaller (approx. 1/5 of the lifting capacity).
• Substrate thickness – to utilize 100% power, the steel must be sufficiently thick. Paper-thin metal restricts the attraction force (the magnet "punches through" it).
• Steel grade – the best choice is high-permeability steel. Stainless steels may generate lower lifting capacity.
• Surface condition – smooth surfaces guarantee perfect abutment, which improves field saturation. Rough surfaces reduce efficiency.
• Heat – neodymium magnets have a sensitivity to temperature. At higher temperatures they lose power, and in frost they can be stronger (up to a certain limit).

* Lifting capacity was determined with the use of a steel plate with a smooth surface of suitable thickness (min. 20 mm), under vertically applied force, however under parallel forces the lifting capacity is smaller. Additionally, even a small distance {between} the magnet’s surface and the plate decreases the load capacity.