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 power, flat magnets are regularly applied in devices that need strong holding power.
Most common temperature resistance of these magnets is 80 °C, but depending on the dimensions, this value can increase.
Additionally, flat magnets commonly have special coatings applied to their surfaces, e.g. nickel, gold, or chrome, to improve their durability.
The magnet named MPL 20x20x20 / N38 and a magnetic force 31.59 kg weighing only 60 grams, making it the excellent choice for applications requiring a flat shape.
Contact surface: Thanks to their flat shape, flat magnets guarantee a greater contact surface with adjacent parts, which is beneficial in applications requiring a stronger magnetic connection.
Technology applications: These are often utilized in various devices, e.g. sensors, stepper motors, or speakers, where the thin and wide shape is crucial for their operation.
Mounting: Their flat shape simplifies mounting, particularly when there's a need to attach the magnet to some surface.
Design flexibility: The flat shape of the magnets allows creators greater flexibility in arranging 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, one should remember that the optimal shape of the magnet depends on the given use and requirements. In some cases, other shapes, such as cylindrical or spherical, are more appropriate.
Magnets have two poles: north (N) and south (S), which interact with each other when they are oppositely oriented. Poles of the same kind, such as two north poles, repel each other.
Due to these properties, magnets are commonly used in electrical devices, such as motors, speakers, sensors, or magnetic locks. Neodymium magnets stand out with the highest power of attraction, making them indispensable for applications requiring strong magnetic fields. Moreover, the strength of a magnet depends on its dimensions and the materials used.
It should be noted 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. Additionally, strong magnets can interfere with the operation of devices, such as compasses, magnetic stripe cards or medical equipment, like pacemakers. Therefore, it is important to exercise caution when using magnets.
Advantages as well as disadvantages of neodymium magnets NdFeB.
In addition to their remarkable strength, neodymium magnets offer the following advantages:
- They virtually do not lose strength, because even after 10 years, the decline in efficiency is only ~1% (in laboratory conditions),
- They are extremely resistant to demagnetization caused by external magnetic fields,
- In other words, due to the metallic silver coating, the magnet obtains an aesthetic appearance,
- They have exceptional magnetic induction on the surface of the magnet,
- With the right combination of magnetic alloys, they reach increased thermal stability, enabling operation at or above 230°C (depending on the structure),
- The ability for custom shaping as well as adjustment to custom needs – neodymium magnets can be manufactured in many forms and dimensions, which extends the scope of their use cases,
- Important function in advanced technical fields – they find application in data storage devices, electric drives, clinical machines along with high-tech tools,
- Relatively small size with high magnetic force – neodymium magnets offer impressive pulling strength in small dimensions, which makes them ideal in small systems
Disadvantages of NdFeB magnets:
- They can break when subjected to a sudden impact. If the magnets are exposed to external force, they should be placed in a protective enclosure. The steel housing, in the form of a holder, protects the magnet from damage and additionally reinforces its overall resistance,
- They lose field intensity at high temperatures. Most neodymium magnets experience permanent loss in strength when heated above 80°C (depending on the shape and height). However, we offer special variants with high temperature resistance that can operate up to 230°C or higher,
- They rust in a moist environment. If exposed to rain, we recommend using moisture-resistant magnets, such as those made of plastic,
- Limited ability to create complex details in the magnet – the use of a mechanical support is recommended,
- Safety concern related to magnet particles may arise, if ingested accidentally, which is significant in the family environments. Additionally, tiny components from these devices may hinder health screening once in the system,
- Higher purchase price is an important factor to consider compared to ceramic magnets, especially in budget-sensitive applications
Optimal lifting capacity of a neodymium magnet – what contributes to it?
The given holding capacity of the magnet corresponds to the highest holding force, assessed in the best circumstances, that is:
- with mild steel, serving as a magnetic flux conductor
- of a thickness of at least 10 mm
- with a smooth surface
- in conditions of no clearance
- in a perpendicular direction of force
- in normal thermal conditions
Lifting capacity in real conditions – factors
The lifting capacity of a magnet is determined by in practice the following factors, from primary to secondary:
- 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 a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, however under parallel forces the load capacity is reduced by as much as 5 times. In addition, even a small distance {between} the magnet’s surface and the plate lowers the holding force.
Handle with Care: Neodymium Magnets
Dust and powder from neodymium magnets are flammable.
Do not attempt to drill into neodymium magnets. Mechanical processing is also not recommended. If the magnet is crushed into fine powder or dust, it becomes highly flammable.
If you have a nickel allergy, avoid contact with neodymium magnets.
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, try wearing gloves or avoid direct contact with nickel-plated neodymium magnets.
Neodymium magnets can demagnetize at high temperatures.
Although magnets have demonstrated their effectiveness up to 80°C or 175°F, the temperature can vary depending on the type, shape, and intended use of the specific magnet.
Keep neodymium magnets away from children.
Not all neodymium magnets are toys, so do not let children play with them. In the case of small magnets, they can be swallowed and cause choking. In such cases, the only solution is to undergo surgery to remove the magnets, and otherwise, it can even lead to death.
Do not place neodymium magnets near a computer HDD, TV, and wallet.
The strong magnetic field generated by neodymium magnets can destroy 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. Do not forget to keep neodymium magnets away from these electronic devices.
Do not bring neodymium magnets close to GPS and smartphones.
Neodymium magnets generate intense magnetic fields that interfere with magnetometers and compasses used in navigation, as well as internal compasses of smartphones and GPS devices.
Neodymium magnets are not recommended for people with pacemakers.
Neodymium magnets generate strong magnetic fields. As a result, they interfere with the operation of a pacemaker. This is because many of these devices are equipped with a function that deactivates the device in a magnetic field.
Neodymium magnets are the strongest magnets ever invented. Their power can surprise you.
Make sure to review all the information we have provided. This will help you avoid harm to your body and damage to the magnets.
Neodymium magnetic are highly susceptible to damage, leading to shattering.
In the event of a collision between two neodymium magnets, it can result in them getting chipped. They are coated with a shiny nickel plating similar to steel, but they are not as hard. 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.
It is crucial not to allow the magnets to pinch together uncontrollably or place your fingers in their path as they attract to each other.
Magnets will 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 attract. Magnets, depending on their size, are able even cut off a finger or there can be a severe pressure or even a fracture.
Safety rules!
So you are aware of why neodymium magnets are so dangerous, see the article titled How very dangerous are strong neodymium magnets?.
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