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

Advantages as well as disadvantages of neodymium magnets.

Besides their remarkable strength, neodymium magnets offer the following advantages:

• They do not lose strength, even over around ten years – the decrease in power is only ~1% (based on measurements),
• They do not lose their magnetic properties even under close interference source,
• In other words, due to the smooth layer of gold, the element looks attractive,
• Magnets are distinguished by impressive magnetic induction on the outer layer,
• Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
• Thanks to the option of flexible forming and adaptation to individualized needs, NdFeB magnets can be created in a variety of forms and dimensions, which expands the range of possible applications,
• Versatile presence in high-tech industry – they are used in data components, drive modules, advanced medical instruments, as well as complex engineering applications.
• Relatively small size with high pulling force – neodymium magnets offer high power in small dimensions, which makes them useful in miniature devices

Drawbacks and weaknesses of neodymium magnets and proposals for their use:

• To avoid cracks under impact, we recommend using special steel housings. Such a solution secures the magnet and simultaneously increases its durability.
• When exposed to high temperature, neodymium magnets suffer a drop in force. Often, when the temperature exceeds 80°C, their power decreases (depending on the size and shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
• When exposed to humidity, magnets start to rust. For applications outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which secure oxidation and corrosion.
• We recommend a housing - magnetic holder, due to difficulties in creating threads inside the magnet and complex forms.
• Possible danger related to microscopic parts of magnets pose a threat, if swallowed, which becomes key in the context of child safety. It is also worth noting that small elements of these magnets are able to complicate diagnosis medical in case of swallowing.
• With budget limitations the cost of neodymium magnets is a challenge,

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

The load parameter shown represents the peak performance, recorded under optimal environment, specifically:

• on a plate made of mild steel, effectively closing the magnetic field
• with a thickness minimum 10 mm
• with a surface cleaned and smooth
• with total lack of distance (no impurities)
• under vertical application of breakaway force (90-degree angle)
• at temperature approx. 20 degrees Celsius

Impact of factors on magnetic holding capacity in practice

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

• Air gap (betwixt the magnet and the plate), since even a microscopic clearance (e.g. 0.5 mm) results in a decrease in lifting capacity by up to 50% (this also applies to paint, rust or dirt).
• Loading method – catalog parameter refers to pulling vertically. When applying parallel force, the magnet holds much less (often approx. 20-30% of maximum force).
• Base massiveness – insufficiently thick sheet causes magnetic saturation, causing part of the power to be wasted into the air.
• Material composition – different alloys reacts the same. Alloy additives worsen the interaction with the magnet.
• Surface structure – the more even the surface, the better the adhesion and stronger the hold. Roughness creates an air distance.
• Heat – neodymium magnets have a sensitivity to temperature. At higher temperatures they are weaker, and at low temperatures they can be stronger (up to a certain limit).

* Holding force was tested on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, whereas under attempts to slide the magnet the holding force is lower. In addition, even a minimal clearance {between} the magnet’s surface and the plate decreases the load capacity.