UMH 60x15x69 [M8] / N38 - magnetic holder with hook

Strengths as well as weaknesses of NdFeB magnets.

Apart from their superior magnetic energy, neodymium magnets have these key benefits:

• They virtually do not lose power, because even after ten years the performance loss is only ~1% (according to literature),
• Neodymium magnets prove to be exceptionally resistant to loss of magnetic properties caused by magnetic disturbances,
• A magnet with a shiny gold surface is more attractive,
• They show high magnetic induction at the operating surface, making them more effective,
• Due to their durability and thermal resistance, neodymium magnets can operate (depending on the shape) even at high temperatures reaching 230°C or more...
• Possibility of exact creating and optimizing to concrete conditions,
• Fundamental importance in future technologies – they serve a role in magnetic memories, electric drive systems, advanced medical instruments, and industrial machines.
• Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in compact dimensions, which makes them useful in miniature devices

Characteristics of disadvantages of neodymium magnets and ways of using them

• To avoid cracks upon strong impacts, we suggest using special steel holders. Such a solution protects the magnet and simultaneously increases its durability.
• We warn that neodymium magnets can lose 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 corrode. Therefore when using outdoors, we advise using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
• Due to limitations in realizing threads and complex forms in magnets, we propose using cover - magnetic mechanism.
• Possible danger resulting from small fragments of magnets can be dangerous, if swallowed, which becomes key in the context of child health protection. It is also worth noting that small elements of these products are able to disrupt the diagnostic process medical in case of swallowing.
• With budget limitations the cost of neodymium magnets is economically unviable,

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

The specified lifting capacity refers to the peak performance, obtained under optimal environment, specifically:

• using a base made of low-carbon steel, serving as a magnetic yoke
• whose transverse dimension is min. 10 mm
• with a plane free of scratches
• under conditions of ideal adhesion (metal-to-metal)
• for force applied at a right angle (pull-off, not shear)
• at ambient temperature approx. 20 degrees Celsius

Magnet lifting force in use – key factors

Please note that the working load will differ influenced by elements below, starting with the most relevant:

• Distance – existence of any layer (rust, dirt, gap) acts as an insulator, which lowers power steeply (even by 50% at 0.5 mm).
• Force direction – catalog parameter refers to pulling vertically. When slipping, the magnet holds much less (often approx. 20-30% of nominal force).
• Steel thickness – too thin sheet does not accept the full field, causing part of the flux to be lost to the other side.
• Steel grade – ideal substrate is high-permeability steel. Hardened steels may generate lower lifting capacity.
• Plate texture – ground elements guarantee perfect abutment, which improves field saturation. Uneven metal reduce efficiency.
• Temperature influence – hot environment weakens pulling force. Exceeding the limit temperature can permanently demagnetize the magnet.

* Lifting capacity was measured using a polished steel plate of suitable thickness (min. 20 mm), under perpendicular detachment force, in contrast under attempts to slide the magnet the lifting capacity is smaller. Moreover, even a minimal clearance {between} the magnet and the plate decreases the holding force.