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

Strengths as well as weaknesses of rare earth magnets.

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

• They have unchanged lifting capacity, and over around ten years their performance decreases symbolically – ~1% (in testing),
• Neodymium magnets remain highly resistant to loss of magnetic properties caused by external field sources,
• By applying a reflective coating of gold, the element presents an professional look,
• Neodymium magnets ensure maximum magnetic induction on a contact point, which allows for strong attraction,
• Due to their durability and thermal resistance, neodymium magnets can operate (depending on the form) even at high temperatures reaching 230°C or more...
• Thanks to modularity in forming and the ability to modify to individual projects,
• Fundamental importance in electronics industry – they are used in HDD drives, electric motors, medical equipment, and technologically advanced constructions.
• Compactness – despite small sizes they provide effective action, making them ideal for precision applications

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

• To avoid cracks under impact, we suggest using special steel holders. Such a solution protects the magnet and simultaneously increases its durability.
• We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
• Magnets exposed to a humid environment can rust. Therefore while using outdoors, we advise using waterproof magnets made of rubber, plastic or other material resistant to moisture
• Due to limitations in producing threads and complicated forms in magnets, we recommend using cover - magnetic holder.
• Health risk to health – tiny shards of magnets pose a threat, in case of ingestion, which is particularly important in the context of child health protection. It is also worth noting that small components of these products are able to be problematic in diagnostics medical in case of swallowing.
• High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which can limit application in large quantities

Breakaway strength of the magnet in ideal conditions – what affects it?

The specified lifting capacity represents the peak performance, recorded under laboratory conditions, specifically:

• using a base made of low-carbon steel, serving as a magnetic yoke
• whose transverse dimension is min. 10 mm
• with a surface perfectly flat
• with total lack of distance (without paint)
• under perpendicular force vector (90-degree angle)
• at ambient temperature room level

Determinants of lifting force in real conditions

During everyday use, the real power is determined by many variables, listed from crucial:

• Distance (between the magnet and the metal), since even a microscopic clearance (e.g. 0.5 mm) can cause a drastic drop in lifting capacity by up to 50% (this also applies to paint, rust or dirt).
• Direction of force – highest force is reached only during perpendicular pulling. The resistance to sliding of the magnet along the plate is usually many times lower (approx. 1/5 of the lifting capacity).
• Element thickness – for full efficiency, the steel must be adequately massive. Paper-thin metal restricts the attraction force (the magnet "punches through" it).
• Material composition – not every steel reacts the same. High carbon content weaken the attraction effect.
• Surface finish – ideal contact is obtained only on polished steel. Rough texture reduce the real contact area, reducing force.
• Thermal factor – hot environment weakens pulling force. Exceeding the limit temperature can permanently damage the magnet.

* Holding force was measured on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, whereas under attempts to slide the magnet the load capacity is reduced by as much as 75%. Additionally, even a minimal clearance {between} the magnet’s surface and the plate lowers the holding force.