MW 8x1.5 / N38 - cylindrical magnet

Pros and cons of rare earth magnets.

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

• Their power remains stable, and after approximately 10 years it decreases only by ~1% (theoretically),
• They are extremely resistant to demagnetization induced by external field influence,
• Thanks to the shimmering finish, the plating of nickel, gold-plated, or silver gives an aesthetic appearance,
• The surface of neodymium magnets generates a concentrated magnetic field – this is a key feature,
• Through (adequate) combination of ingredients, they can achieve high thermal resistance, enabling functioning at temperatures approaching 230°C and above...
• Due to the potential of accurate molding and customization to unique projects, neodymium magnets can be modeled in a variety of forms and dimensions, which expands the range of possible applications,
• Universal use in modern industrial fields – they serve a role in hard drives, electromotive mechanisms, precision medical tools, and industrial machines.
• Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Characteristics of disadvantages of neodymium magnets: tips and applications.

• To avoid cracks upon strong impacts, we suggest using special steel housings. Such a solution protects the magnet and simultaneously improves its durability.
• We warn that neodymium magnets can lose their power at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
• When exposed to humidity, magnets start to rust. To use them in conditions outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which secure oxidation and corrosion.
• Limited possibility of producing nuts in the magnet and complicated shapes - preferred is a housing - mounting mechanism.
• Possible danger related to microscopic parts of magnets can be dangerous, when accidentally swallowed, which is particularly important in the aspect of protecting the youngest. Additionally, tiny parts of these magnets are able to complicate diagnosis medical in case of swallowing.
• With mass production the cost of neodymium magnets is economically unviable,

Best holding force of the magnet in ideal parameters – what contributes to it?

Holding force of 0.66 kg is a measurement result executed under standard conditions:

• on a block made of structural steel, perfectly concentrating the magnetic field
• with a cross-section of at least 10 mm
• characterized by smoothness
• without any insulating layer between the magnet and steel
• under perpendicular application of breakaway force (90-degree angle)
• at ambient temperature approx. 20 degrees Celsius

What influences lifting capacity in practice

In real-world applications, the real power depends on several key aspects, listed from the most important:

• Gap between magnet and steel – even a fraction of a millimeter of separation (caused e.g. by varnish or dirt) drastically reduces the magnet efficiency, often by half at just 0.5 mm.
• Force direction – note that the magnet has greatest strength perpendicularly. Under sliding down, the capacity drops significantly, often to levels of 20-30% of the maximum value.
• Element thickness – to utilize 100% power, the steel must be adequately massive. Thin sheet restricts the lifting capacity (the magnet "punches through" it).
• Steel type – low-carbon steel attracts best. Higher carbon content reduce magnetic properties and holding force.
• Surface finish – full contact is obtained only on smooth steel. Any scratches and bumps reduce the real contact area, weakening the magnet.
• Temperature influence – high temperature reduces magnetic field. Exceeding the limit temperature can permanently damage the magnet.

* Holding force was checked on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, whereas under shearing force the lifting capacity is smaller. In addition, even a slight gap {between} the magnet and the plate decreases the lifting capacity.