UMGW 48x24x11.5 [M8] GW / N38 - magnetic holder internal thread

Advantages as well as disadvantages of rare earth magnets.

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

• They virtually do not lose power, because even after 10 years the performance loss is only ~1% (in laboratory conditions),
• Neodymium magnets are extremely resistant to loss of magnetic properties caused by external interference,
• A magnet with a smooth gold surface looks better,
• Neodymium magnets generate maximum magnetic induction on a contact point, 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...
• Thanks to versatility in shaping and the ability to adapt to specific needs,
• Significant place in advanced technology sectors – they are used in hard drives, motor assemblies, diagnostic systems, as well as complex engineering applications.
• Compactness – despite small sizes they generate large force, making them ideal for precision applications

What to avoid - cons of neodymium magnets and ways of using them

• To avoid cracks upon strong impacts, we recommend using special steel holders. Such a solution protects the magnet and simultaneously improves its durability.
• When exposed to high temperature, neodymium magnets suffer a drop in force. Often, when the temperature exceeds 80°C, their power 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 advise using waterproof magnets made of rubber, plastic or other material resistant to moisture
• Due to limitations in creating nuts and complex forms in magnets, we propose using a housing - magnetic holder.
• Possible danger to health – tiny shards of magnets pose a threat, when accidentally swallowed, which is particularly important in the context of child safety. Furthermore, tiny parts of these products can complicate diagnosis medical after entering the body.
• Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Maximum lifting force for a neodymium magnet – what contributes to it?

Holding force of 80 kg is a theoretical maximum value conducted under specific, ideal conditions:

• using a plate made of mild steel, functioning as a circuit closing element
• possessing a massiveness of minimum 10 mm to ensure full flux closure
• with an ideally smooth touching surface
• under conditions of no distance (metal-to-metal)
• during pulling in a direction perpendicular to the plane
• in stable room temperature

Key elements affecting lifting force

Real force is affected by specific conditions, including (from priority):

• Clearance – existence of foreign body (rust, dirt, air) acts as an insulator, which reduces capacity steeply (even by 50% at 0.5 mm).
• Load vector – maximum parameter is obtained only during perpendicular pulling. The resistance to sliding of the magnet along the surface is usually several times lower (approx. 1/5 of the lifting capacity).
• Wall thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field penetrates through instead of converting into lifting capacity.
• Plate material – mild steel attracts best. Alloy steels decrease magnetic permeability and holding force.
• Base smoothness – the smoother and more polished the surface, the larger the contact zone and stronger the hold. Roughness acts like micro-gaps.
• Thermal factor – high temperature reduces magnetic field. Too high temperature can permanently damage the magnet.

* Holding force was checked on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, whereas under shearing force the lifting capacity is smaller. Additionally, even a small distance {between} the magnet’s surface and the plate lowers the holding force.