UMGZ 20x15x7 [M4] GZ / N38 - magnetic holder external thread

Advantages as well as disadvantages of rare earth magnets.

Besides their durability, neodymium magnets are valued for these benefits:

• They virtually do not lose power, because even after ten years the performance loss is only ~1% (in laboratory conditions),
• They maintain their magnetic properties even under strong external field,
• By applying a decorative layer of nickel, the element acquires an proper look,
• Neodymium magnets create maximum magnetic induction on a contact point, which allows for strong attraction,
• Thanks to resistance to high temperature, they are able to function (depending on the shape) even at temperatures up to 230°C and higher...
• Thanks to the option of flexible shaping and adaptation to specialized requirements, magnetic components can be created in a variety of geometric configurations, which amplifies use scope,
• Wide application in future technologies – they serve a role in computer drives, drive modules, medical equipment, and technologically advanced constructions.
• Thanks to concentrated force, small magnets offer high operating force, with minimal size,

Problematic aspects of neodymium magnets and ways of using them

• At strong impacts they can break, therefore we recommend placing them in strong housings. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
• When exposed to high temperature, neodymium magnets suffer a drop in force. 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
• Magnets exposed to a humid environment can corrode. Therefore during using outdoors, we suggest using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
• Limited possibility of creating threads in the magnet and complicated shapes - recommended is casing - magnetic holder.
• Potential hazard to health – tiny shards of magnets can be dangerous, in case of ingestion, which is particularly important in the aspect of protecting the youngest. Furthermore, tiny parts of these products can be problematic in diagnostics medical when they are in the body.
• With large orders the cost of neodymium magnets is a challenge,

Breakaway strength of the magnet in ideal conditions – what affects it?

Magnet power was determined for the most favorable conditions, taking into account:

• with the use of a yoke made of low-carbon steel, guaranteeing full magnetic saturation
• whose thickness equals approx. 10 mm
• with an ground touching surface
• without any clearance between the magnet and steel
• for force acting at a right angle (pull-off, not shear)
• in stable room temperature

Practical aspects of lifting capacity – factors

Bear in mind that the working load may be lower influenced by the following factors, in order of importance:

• Distance (betwixt the magnet and the plate), because even a tiny distance (e.g. 0.5 mm) results in a drastic drop in lifting capacity by up to 50% (this also applies to paint, rust or debris).
• Loading method – declared lifting capacity refers to detachment vertically. When attempting to slide, the magnet exhibits significantly lower power (typically approx. 20-30% of nominal force).
• Wall thickness – thin material does not allow full use of the magnet. Magnetic flux penetrates through instead of generating force.
• Steel grade – ideal substrate is high-permeability steel. Hardened steels may generate lower lifting capacity.
• Surface quality – the more even the surface, the larger the contact zone and higher the lifting capacity. Unevenness creates an air distance.
• Operating temperature – NdFeB sinters have a sensitivity to temperature. At higher temperatures they are weaker, and at low temperatures they can be stronger (up to a certain limit).

* Lifting capacity was determined with the use of a polished steel plate of suitable thickness (min. 20 mm), under vertically applied force, whereas under attempts to slide the magnet the lifting capacity is smaller. In addition, even a small distance {between} the magnet and the plate decreases the holding force.