UMP 75x25 [M10x3] GW F200 GOLD Lina / N42 - search holder

Pros as well as cons of neodymium magnets.

Besides their stability, neodymium magnets are valued for these benefits:

• Their magnetic field is maintained, and after approximately 10 years it drops only by ~1% (theoretically),
• Neodymium magnets prove to be highly resistant to magnetic field loss caused by external magnetic fields,
• A magnet with a metallic gold surface has better aesthetics,
• Neodymium magnets generate maximum magnetic induction on a small surface, which increases force concentration,
• 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 individual shaping and optimizing to concrete conditions,
• Versatile presence in modern technologies – they find application in magnetic memories, drive modules, precision medical tools, as well as technologically advanced constructions.
• Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in compact dimensions, which makes them useful in miniature devices

What to avoid - cons of neodymium magnets: weaknesses and usage proposals

• Susceptibility to cracking is one of their disadvantages. Upon intense impact they can fracture. We advise keeping them in a steel housing, which not only secures them against impacts but also raises their 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 durability even at temperatures up to 230°C
• Due to the susceptibility of magnets to corrosion in a humid environment, we recommend using waterproof magnets made of rubber, plastic or other material resistant to moisture, in case of application outdoors
• We suggest a housing - magnetic mount, due to difficulties in producing threads inside the magnet and complicated shapes.
• Potential hazard to health – tiny shards of magnets are risky, when accidentally swallowed, which becomes key in the context of child safety. Additionally, small components of these devices can disrupt the diagnostic process medical after entering the body.
• Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Magnetic strength at its maximum – what it depends on?

Holding force of 310 kg is a theoretical maximum value executed under the following configuration:

• on a base made of mild steel, optimally conducting the magnetic flux
• with a cross-section minimum 10 mm
• characterized by lack of roughness
• under conditions of no distance (metal-to-metal)
• for force applied at a right angle (in the magnet axis)
• at ambient temperature room level

Lifting capacity in practice – influencing factors

In real-world applications, the actual holding force results from several key aspects, ranked from crucial:

• Clearance – existence of any layer (paint, dirt, air) acts as an insulator, which lowers capacity steeply (even by 50% at 0.5 mm).
• Loading method – declared lifting capacity refers to pulling vertically. When attempting to slide, the magnet exhibits significantly lower power (often approx. 20-30% of maximum force).
• Metal thickness – thin material does not allow full use of the magnet. Magnetic flux passes through the material instead of generating force.
• Steel grade – ideal substrate is high-permeability steel. Stainless steels may generate lower lifting capacity.
• Surface finish – ideal contact is obtained only on smooth steel. Rough texture create air cushions, weakening the magnet.
• Temperature – heating the magnet causes a temporary drop of force. Check the maximum operating temperature for a given model.

* Lifting capacity testing was performed on plates with a smooth surface of optimal thickness, under a perpendicular pulling force, whereas under shearing force the holding force is lower. In addition, even a slight gap {between} the magnet’s surface and the plate lowers the load capacity.