UMGZ 25x17x8 [M5] GZ / N38 - magnetic holder external thread

Pros as well as cons of NdFeB magnets.

Apart from their superior power, neodymium magnets have these key benefits:

• Their strength is maintained, and after approximately 10 years it drops only by ~1% (theoretically),
• They are extremely resistant to demagnetization induced by external disturbances,
• The use of an refined finish of noble metals (nickel, gold, silver) causes the element to have aesthetics,
• Magnets exhibit impressive magnetic induction on the outer side,
• 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...
• Possibility of custom forming as well as adapting to concrete applications,
• Significant place in advanced technology sectors – they find application in hard drives, electromotive mechanisms, medical devices, also other advanced devices.
• Relatively small size with high pulling force – neodymium magnets offer high power in small dimensions, which makes them useful in miniature devices

What to avoid - cons of neodymium magnets: application proposals

• To avoid cracks upon strong impacts, we suggest using special steel holders. Such a solution secures the magnet and simultaneously increases its durability.
• Neodymium magnets decrease their force under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 230°C
• Magnets exposed to a humid environment can corrode. Therefore when using outdoors, we recommend using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
• We suggest casing - magnetic holder, due to difficulties in producing nuts inside the magnet and complex shapes.
• Potential hazard related to microscopic parts of magnets can be dangerous, in case of ingestion, which gains importance in the context of child safety. It is also worth noting that small elements of these products can complicate diagnosis medical after entering the body.
• Due to complex production process, their price exceeds standard values,

Detachment force of the magnet in optimal conditions – what it depends on?

The declared magnet strength refers to the peak performance, measured under optimal environment, namely:

• using a sheet made of mild steel, serving as a circuit closing element
• with a thickness minimum 10 mm
• characterized by smoothness
• without any insulating layer between the magnet and steel
• during detachment in a direction perpendicular to the mounting surface
• at conditions approx. 20°C

Magnet lifting force in use – key factors

During everyday use, the actual lifting capacity results from a number of factors, ranked from most significant:

• Distance – the presence of foreign body (paint, dirt, gap) interrupts the magnetic circuit, which lowers power rapidly (even by 50% at 0.5 mm).
• Force direction – catalog parameter refers to detachment vertically. When applying parallel force, the magnet holds much less (typically approx. 20-30% of nominal force).
• Base massiveness – too thin steel does not accept the full field, causing part of the flux to be wasted into the air.
• Steel type – low-carbon steel attracts best. Higher carbon content lower magnetic properties and lifting capacity.
• Smoothness – ideal contact is possible only on polished steel. Rough texture reduce the real contact area, reducing force.
• Temperature influence – hot environment reduces magnetic field. Exceeding the limit temperature can permanently demagnetize the magnet.

* Holding force was measured on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, whereas under parallel forces the lifting capacity is smaller. In addition, even a small distance {between} the magnet’s surface and the plate reduces the lifting capacity.