UMGGW 22x6 [M4] GW / N38 - magnetic holder rubber internal thread

Pros as well as cons of NdFeB magnets.

In addition to their long-term stability, neodymium magnets provide the following advantages:

• They retain attractive force for almost 10 years – the loss is just ~1% (according to analyses),
• Neodymium magnets are characterized by remarkably resistant to demagnetization caused by external field sources,
• By covering with a shiny layer of silver, the element acquires an elegant look,
• Neodymium magnets deliver maximum magnetic induction on a small surface, which increases force concentration,
• Thanks to resistance to high temperature, they can operate (depending on the form) even at temperatures up to 230°C and higher...
• Possibility of custom machining and adapting to complex conditions,
• Fundamental importance in advanced technology sectors – they are used in HDD drives, electric motors, precision medical tools, as well as other advanced devices.
• Compactness – despite small sizes they generate large force, making them ideal for precision applications

Drawbacks and weaknesses of neodymium magnets: tips and applications.

• To avoid cracks upon strong impacts, we recommend using special steel holders. Such a solution secures the magnet and simultaneously improves its durability.
• Neodymium magnets decrease their strength under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures up to 230°C
• They rust in a humid environment - during use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
• Due to limitations in creating nuts and complex shapes in magnets, we propose using cover - magnetic mount.
• Potential hazard resulting from small fragments of magnets are risky, when accidentally swallowed, which gains importance in the aspect of protecting the youngest. It is also worth noting that tiny parts of these devices can disrupt the diagnostic process medical when they are in the body.
• Due to complex production process, their price exceeds standard values,

Optimal lifting capacity of a neodymium magnet – what it depends on?

Breakaway force was determined for optimal configuration, assuming:

• on a block made of structural steel, optimally conducting the magnetic flux
• possessing a thickness of min. 10 mm to avoid saturation
• with a surface perfectly flat
• under conditions of no distance (metal-to-metal)
• during pulling in a direction vertical to the plane
• in neutral thermal conditions

What influences lifting capacity in practice

In real-world applications, the real power results from many variables, listed from the most important:

• Distance – the presence of foreign body (rust, dirt, air) acts as an insulator, which reduces capacity rapidly (even by 50% at 0.5 mm).
• Pull-off angle – remember that the magnet has greatest strength perpendicularly. Under sliding down, the capacity drops drastically, often to levels of 20-30% of the nominal value.
• Steel thickness – too thin steel does not accept the full field, causing part of the flux to be lost to the other side.
• Metal type – not every steel reacts the same. High carbon content worsen the attraction effect.
• Surface finish – full contact is possible only on polished steel. Rough texture create air cushions, reducing force.
• Thermal conditions – NdFeB sinters have a negative temperature coefficient. When it is hot they are weaker, and at low temperatures gain strength (up to a certain limit).

* Holding force was checked on the plate surface of 20 mm thickness, when the force acted perpendicularly, however under parallel forces the lifting capacity is smaller. In addition, even a minimal clearance {between} the magnet’s surface and the plate decreases the load capacity.