UMGW 60x30x15 [M10] GW / N38 - magnetic holder internal thread

Pros and cons of NdFeB magnets.

Besides their tremendous pulling force, neodymium magnets offer the following advantages:

• They virtually do not lose power, because even after 10 years the performance loss is only ~1% (according to literature),
• They do not lose their magnetic properties even under external field action,
• Thanks to the glossy finish, the layer of nickel, gold, or silver-plated gives an professional appearance,
• Magnets are characterized by huge magnetic induction on the working surface,
• Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the form) even at high temperatures reaching 230°C or more...
• Possibility of custom forming and optimizing to atypical conditions,
• Significant place in future technologies – they are used in mass storage devices, electromotive mechanisms, medical devices, also complex engineering applications.
• Compactness – despite small sizes they generate large force, making them ideal for precision applications

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

• Susceptibility to cracking is one of their disadvantages. Upon strong impact they can fracture. We recommend keeping them in a special holder, which not only secures them against impacts but also increases their durability
• When exposed to high temperature, neodymium magnets suffer a drop in strength. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
• Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material immune to moisture, in case of application outdoors
• We suggest a housing - magnetic mechanism, due to difficulties in creating threads inside the magnet and complex forms.
• Health risk related to microscopic parts of magnets can be dangerous, in case of ingestion, which gains importance in the context of child safety. Furthermore, small components of these devices can complicate diagnosis medical when they are in the body.
• Due to complex production process, their price is higher than average,

Magnetic strength at its maximum – what affects it?

Magnet power was defined for ideal contact conditions, assuming:

• on a base made of structural steel, effectively closing the magnetic field
• whose thickness is min. 10 mm
• with an ground touching surface
• without any clearance between the magnet and steel
• under vertical force direction (90-degree angle)
• at room temperature

What influences lifting capacity in practice

Effective lifting capacity is influenced by working environment parameters, such as (from priority):

• Distance (between the magnet and the plate), since even a very small distance (e.g. 0.5 mm) can cause a drastic drop in force by up to 50% (this also applies to varnish, rust or dirt).
• Direction of force – highest force is reached only during pulling at a 90° angle. The shear force of the magnet along the plate is typically several times lower (approx. 1/5 of the lifting capacity).
• Steel thickness – insufficiently thick steel does not close the flux, causing part of the power to be wasted to the other side.
• Material type – ideal substrate is pure iron steel. Stainless steels may attract less.
• Smoothness – full contact is possible only on polished steel. Rough texture create air cushions, reducing force.
• Thermal environment – temperature increase causes a temporary drop of induction. It is worth remembering the thermal limit for a given model.

* Holding force was tested on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, in contrast under shearing force the load capacity is reduced by as much as 75%. Moreover, even a small distance {between} the magnet and the plate decreases the lifting capacity.