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

Pros and cons of neodymium magnets.

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

• They retain magnetic properties for nearly ten years – the loss is just ~1% (according to analyses),
• They retain their magnetic properties even under strong external field,
• Thanks to the elegant finish, the plating of nickel, gold, or silver gives an clean appearance,
• Magnetic induction on the surface of the magnet remains strong,
• 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...
• Possibility of custom creating and optimizing to concrete conditions,
• Key role in modern industrial fields – they are utilized in magnetic memories, drive modules, precision medical tools, also other advanced devices.
• Thanks to concentrated force, small magnets offer high operating force, occupying minimum space,

Characteristics of disadvantages of neodymium magnets: weaknesses and usage proposals

• To avoid cracks upon strong impacts, we recommend using special steel holders. Such a solution secures the magnet and simultaneously increases its durability.
• NdFeB magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of power (a factor is the shape as well as dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are very resistant to heat
• Magnets exposed to a humid environment can rust. Therefore while using outdoors, we advise using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
• We suggest a housing - magnetic mount, due to difficulties in producing threads inside the magnet and complicated shapes.
• Health risk related to microscopic parts of magnets are risky, if swallowed, which becomes key in the aspect of protecting the youngest. It is also worth noting that tiny parts of these products can complicate diagnosis medical when they are in the body.
• With large orders the cost of neodymium magnets is a challenge,

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

Magnet power was defined for optimal configuration, assuming:

• using a base made of mild steel, functioning as a magnetic yoke
• whose transverse dimension reaches at least 10 mm
• with a plane free of scratches
• under conditions of no distance (surface-to-surface)
• under axial force vector (90-degree angle)
• at standard ambient temperature

What influences lifting capacity in practice

Holding efficiency is influenced by specific conditions, mainly (from most important):

• Clearance – existence of any layer (rust, dirt, gap) interrupts the magnetic circuit, which reduces capacity steeply (even by 50% at 0.5 mm).
• Load vector – highest force is reached only during perpendicular pulling. The shear force of the magnet along the surface is usually many times lower (approx. 1/5 of the lifting capacity).
• Wall thickness – thin material does not allow full use of the magnet. Part of the magnetic field passes through the material instead of converting into lifting capacity.
• Steel grade – the best choice is high-permeability steel. Hardened steels may attract less.
• Base smoothness – the smoother and more polished the surface, the larger the contact zone and stronger the hold. Roughness creates an air distance.
• Temperature influence – hot environment reduces magnetic field. Exceeding the limit temperature can permanently demagnetize the magnet.

* Holding force was measured on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, however under parallel forces the holding force is lower. Additionally, even a slight gap {between} the magnet and the plate lowers the load capacity.