MPL 20x20x20 / N38 - lamellar magnet
lamellar magnet
Catalog no 020129
GTIN: 5906301811350
length [±0,1 mm]
20 mm
Width [±0,1 mm]
20 mm
Height [±0,1 mm]
20 mm
Weight
60 g
Magnetization Direction
↑ axial
Load capacity
31.59 kg / 309.79 N
Magnetic Induction
540.22 mT
Coating
[NiCuNi] nickel
31.98 ZŁ with VAT / pcs + price for transport
26.00 ZŁ net + 23% VAT / pcs
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MPL 20x20x20 / N38 - lamellar magnet
Magnetic properties of material N38
Physical properties of NdFeB
Shopping tips
Due to their strength, flat magnets are commonly used in products that require very strong attraction.
Most common temperature resistance of these magnets is 80°C, but depending on the dimensions, this value can increase.
In addition, flat magnets often have different coatings applied to their surfaces, e.g. nickel, gold, or chrome, to improve their corrosion resistance.
The magnet with the designation MPL 20x20x20 / N38 i.e. a lifting capacity of 31.59 kg which weighs just 60 grams, making it the ideal choice for applications requiring a flat shape.
Contact surface: Due to their flat shape, flat magnets ensure a larger contact surface with other components, which is beneficial in applications requiring a stronger magnetic connection.
Technology applications: These magnets are often applied in different devices, such as sensors, stepper motors, or speakers, where the flat shape is crucial for their operation.
Mounting: The flat form's flat shape makes mounting, particularly when there's a need to attach the magnet to some surface.
Design flexibility: The flat shape of the magnets permits designers greater flexibility in placing them in structures, which can be more difficult with magnets of more complex shapes.
Stability: In certain applications, the flat base of the flat magnet can offer better stability, minimizing the risk of shifting or rotating. However, it's important to note that the optimal shape of the magnet depends on the specific project and requirements. In certain cases, other shapes, like cylindrical or spherical, are more appropriate.
Magnets have two main poles: north (N) and south (S), which attract each other when they are oppositely oriented. Similar poles, e.g. two north poles, act repelling on each other.
Thanks to this principle of operation, magnets are often used in electrical devices, such as motors, speakers, sensors, or magnetic locks. Neodymium magnets stand out with the greatest strength of attraction, making them perfect for applications requiring powerful magnetic fields. Additionally, the strength of a magnet depends on its size and the materials used.
It’s worth noting that high temperatures can weaken the magnet's effect. Every magnetic material has its Curie point, meaning that once this temperature is exceeded, the magnet stops being magnetic. Interestingly, strong magnets can interfere with the operation of devices, such as navigational instruments, magnetic stripe cards and even electronic devices sensitive to magnetic fields. For this reason, it is important to avoid placing magnets near such devices.
Advantages and disadvantages of neodymium magnets NdFeB.
In addition to their magnetic efficiency, neodymium magnets provide the following advantages:
- They do not lose their even over around 10 years – the decrease of lifting capacity is only ~1% (according to tests),
- They protect against demagnetization induced by ambient electromagnetic environments remarkably well,
- In other words, due to the shiny silver coating, the magnet obtains an stylish appearance,
- Magnetic induction on the surface of these magnets is notably high,
- With the right combination of compounds, they reach significant thermal stability, enabling operation at or above 230°C (depending on the structure),
- The ability for custom shaping and adjustment to custom needs – neodymium magnets can be manufactured in many forms and dimensions, which extends the scope of their use cases,
- Significant impact in cutting-edge sectors – they serve a purpose in computer drives, electromechanical systems, medical equipment or even high-tech tools,
- Compactness – despite their small size, they generate strong force, making them ideal for precision applications
Disadvantages of magnetic elements:
- They can break when subjected to a sudden impact. If the magnets are exposed to mechanical hits, we recommend in a steel housing. The steel housing, in the form of a holder, protects the magnet from damage , and at the same time reinforces its overall resistance,
- Magnets lose pulling force when exposed to temperatures exceeding 80°C. In most cases, this leads to irreversible field weakening (influenced by the magnet’s form). To address this, we provide [AH] models with superior thermal resistance, able to operate even at 230°C or more,
- Magnets exposed to moisture can oxidize. Therefore, for outdoor applications, it's best to use waterproof types made of coated materials,
- Limited ability to create threads in the magnet – the use of a mechanical support is recommended,
- Possible threat from tiny pieces may arise, in case of ingestion, which is significant in the health of young users. Furthermore, minuscule fragments from these devices may complicate medical imaging if inside the body,
- Due to expensive raw materials, their cost is above average,
Detachment force of the magnet in optimal conditions – what affects it?
The given pulling force of the magnet corresponds to the maximum force, determined in ideal conditions, that is:
- using a steel plate with low carbon content, serving as a magnetic circuit closure
- having a thickness of no less than 10 millimeters
- with a smooth surface
- with no separation
- under perpendicular detachment force
- under standard ambient temperature
Determinants of lifting force in real conditions
Practical lifting force is determined by elements, by priority:
- Air gap between the magnet and the plate, because even a very small distance (e.g. 0.5 mm) can cause a drop in lifting force of up to 50%.
- Direction of applied force, because the maximum lifting capacity is achieved under perpendicular application. The force required to slide the magnet along the plate is usually several times lower.
- Thickness of the plate, as a plate that is too thin causes part of the magnetic flux not to be used and to remain wasted in the air.
- Material of the plate, because higher carbon content lowers holding force, while higher iron content increases it. The best choice is steel with high magnetic permeability and high saturation induction.
- Surface of the plate, because the more smooth and polished it is, the better the contact and consequently the greater the magnetic saturation.
- Operating temperature, since all permanent magnets have a negative temperature coefficient. This means that at high temperatures they are weaker, while at sub-zero temperatures they become slightly stronger.
* Holding force was measured on the plate surface of 20 mm thickness, when the force acted perpendicularly, in contrast under parallel forces the load capacity is reduced by as much as 5 times. In addition, even a minimal clearance {between} the magnet and the plate decreases the lifting capacity.
Be Cautious with Neodymium Magnets
Neodymium magnets can demagnetize at high temperatures.
Although magnets are generally resilient, their ability to maintain their magnetic potency can be influenced by factors like the type of material used, the magnet's shape, and the intended purpose for which it is employed.
You should maintain neodymium magnets at a safe distance from the wallet, computer, and TV.
The strong magnetic field generated by neodymium magnets can damage magnetic media such as floppy disks, video tapes, HDDs, credit cards, magnetic ID cards, cassette tapes, or other devices. They can also destroy videos, televisions, CRT computer monitors. Remember not to place neodymium magnets close to these electronic devices.
Neodymium magnets are primarily characterized by their significant internal force. They attract to each other, and any object that comes in their way will be affected.
Magnets attract each other within a distance of several to around 10 cm from each other. Remember not to insert fingers between magnets or alternatively in their path when they attract. Depending on how massive the neodymium magnets are, they can lead to a cut or alternatively a fracture.
Neodymium magnets are among the most powerful magnets on Earth. The astonishing force they generate between each other can surprise you.
To use magnets properly, it is best to familiarize yourself with our information beforehand. This will help you avoid significant harm to your body and the magnets themselves.
The magnet coating is made of nickel, so be cautious if you have an allergy.
Studies clearly indicate a small percentage of people who suffer from metal allergies such as nickel. An allergic reaction often manifests as skin redness and rash. If you have a nickel allergy, you can try wearing gloves or simply avoid direct contact with nickel-plated neodymium magnets.
Keep neodymium magnets away from GPS and smartphones.
Neodymium magnets are a source of intense magnetic fields that cause interference with magnetometers and compasses used in navigation, as well as internal compasses of smartphones and GPS devices.
Dust and powder from neodymium magnets are flammable.
Do not attempt to drill into neodymium magnets. Mechanical processing is also not recommended. Once crushed into fine powder or dust, this material becomes highly flammable.
Neodymium magnets are especially delicate, resulting in shattering.
In the event of a collision between two neodymium magnets, it can result in them getting chipped. Despite being made of metal as well as coated with a shiny nickel plating, they are not as hard as steel. In the case of a collision between two magnets, there can be a scattering of small sharp metal fragments in different directions. Protecting your eyes is essential.
Magnets are not toys, children should not play with them.
Neodymium magnets are not toys. You cannot allow them to become toys for children. In such a situation, surgery is necessary to remove them. In the worst case scenario, it can result in death.
Neodymium magnets should not be near people with pacemakers.
Neodymium magnets generate strong magnetic fields. As a result, they interfere with the operation of a pacemaker. This happens because such devices have a function to deactivate them in a magnetic field.
Safety rules!
In order for you to know how powerful neodymium magnets are and why they are so dangerous, see the article - Dangerous powerful neodymium magnets.
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