MW 5x25 / N38 - cylindrical magnet

Pros and cons of rare earth magnets.

Besides their immense magnetic power, neodymium magnets offer the following advantages:

• Their magnetic field is durable, and after approximately ten years it drops only by ~1% (according to research),
• They are resistant to demagnetization induced by external disturbances,
• By covering with a decorative layer of gold, the element acquires an elegant look,
• Magnetic induction on the surface of the magnet is very high,
• Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and can work (depending on the form) even at a temperature of 230°C or more...
• Possibility of accurate creating and optimizing to concrete needs,
• Key role in advanced technology sectors – they are utilized in magnetic memories, electric motors, precision medical tools, as well as other advanced devices.
• Thanks to efficiency per cm³, small magnets offer high operating force, in miniature format,

Disadvantages of neodymium magnets:

• To avoid cracks upon strong impacts, we recommend using special steel holders. Such a solution secures the magnet and simultaneously improves its durability.
• We warn that neodymium magnets can reduce their power 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 rust. Therefore when using outdoors, we advise using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
• Due to limitations in realizing nuts and complex forms in magnets, we propose using a housing - magnetic mount.
• Health risk related to microscopic parts of magnets pose a threat, when accidentally swallowed, which gains importance in the context of child safety. It is also worth noting that tiny parts of these devices are able to complicate diagnosis medical when they are in the body.
• With budget limitations the cost of neodymium magnets is a challenge,

Maximum holding power of the magnet – what contributes to it?

The load parameter shown concerns the maximum value, obtained under optimal environment, specifically:

• on a base made of structural steel, optimally conducting the magnetic field
• with a thickness no less than 10 mm
• with a surface cleaned and smooth
• with zero gap (without coatings)
• during pulling in a direction vertical to the mounting surface
• at standard ambient temperature

Impact of factors on magnetic holding capacity in practice

Real force is influenced by specific conditions, including (from most important):

• Space between surfaces – even a fraction of a millimeter of separation (caused e.g. by veneer or dirt) significantly weakens the magnet efficiency, often by half at just 0.5 mm.
• Force direction – catalog parameter refers to pulling vertically. When attempting to slide, the magnet exhibits significantly lower power (often approx. 20-30% of nominal force).
• Wall thickness – thin material does not allow full use of the magnet. Magnetic flux penetrates through instead of converting into lifting capacity.
• Chemical composition of the base – low-carbon steel attracts best. Alloy steels reduce magnetic properties and holding force.
• Base smoothness – the more even the plate, the larger the contact zone and higher the lifting capacity. Roughness acts like micro-gaps.
• Thermal factor – high temperature reduces magnetic field. Too high temperature can permanently demagnetize the magnet.

* Lifting capacity was determined using a steel plate with a smooth surface of suitable thickness (min. 20 mm), under vertically applied force, in contrast under attempts to slide the magnet the holding force is lower. Moreover, even a slight gap {between} the magnet and the plate lowers the lifting capacity.