UMP 135x40 [M10+M12] GW F 600 kg / N38 - search holder

Advantages and disadvantages of rare earth magnets.

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

• Their power is durable, and after approximately ten years it decreases only by ~1% (according to research),
• They are extremely resistant to demagnetization induced by presence of other magnetic fields,
• In other words, due to the smooth layer of gold, the element looks attractive,
• Neodymium magnets generate maximum magnetic induction on a contact point, which allows for strong attraction,
• 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 modularity in forming and the ability to adapt to client solutions,
• Key role in modern industrial fields – they are utilized in magnetic memories, electric drive systems, advanced medical instruments, as well as technologically advanced constructions.
• Thanks to concentrated force, small magnets offer high operating force, occupying minimum space,

Characteristics of disadvantages of neodymium magnets: application proposals

• They are prone to damage upon heavy impacts. To avoid cracks, it is worth protecting magnets using a steel holder. Such protection not only protects the magnet but also increases its resistance to damage
• 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. For use outdoors we advise using waterproof magnets e.g. in rubber, plastic
• We suggest a housing - magnetic holder, due to difficulties in producing threads inside the magnet and complex forms.
• Potential hazard related to microscopic parts of magnets pose a threat, when accidentally swallowed, which gains importance in the aspect of protecting the youngest. It is also worth noting that small elements of these magnets can disrupt the diagnostic process medical after entering the body.
• Due to neodymium price, their price is relatively high,

Best holding force of the magnet in ideal parameters – what it depends on?

Holding force of 680 kg is a theoretical maximum value performed under specific, ideal conditions:

• with the contact of a sheet made of special test steel, ensuring full magnetic saturation
• possessing a massiveness of at least 10 mm to avoid saturation
• with a plane free of scratches
• under conditions of no distance (metal-to-metal)
• for force acting at a right angle (pull-off, not shear)
• in temp. approx. 20°C

What influences lifting capacity in practice

It is worth knowing that the application force may be lower depending on the following factors, starting with the most relevant:

• Clearance – the presence of any layer (paint, dirt, air) acts as an insulator, which lowers power rapidly (even by 50% at 0.5 mm).
• Direction of force – maximum parameter is reached only during perpendicular pulling. The force required to slide of the magnet along the surface is usually many times smaller (approx. 1/5 of the lifting capacity).
• Plate thickness – too thin sheet does not accept the full field, causing part of the power to be lost to the other side.
• Material composition – not every steel attracts identically. High carbon content worsen the attraction effect.
• Surface condition – smooth surfaces ensure maximum contact, which improves force. Rough surfaces weaken the grip.
• Heat – NdFeB sinters have a sensitivity to temperature. At higher temperatures they lose power, and at low temperatures gain strength (up to a certain limit).

* Holding force was tested on the plate surface of 20 mm thickness, when a perpendicular force was applied, however under shearing force the holding force is lower. Moreover, even a minimal clearance {between} the magnet and the plate decreases the load capacity.