MPL 20x5x3 / N38 - lamellar magnet
lamellar magnet
Catalog no 020131
GTIN: 5906301811374
length [±0,1 mm]
20 mm
Width [±0,1 mm]
5 mm
Height [±0,1 mm]
3 mm
Weight
2.25 g
Magnetization Direction
↑ axial
Load capacity
2.37 kg / 23.24 N
Magnetic Induction
358.88 mT
Coating
[NiCuNi] nickel
1.058 ZŁ with VAT / pcs + price for transport
0.860 ZŁ net + 23% VAT / pcs
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MPL 20x5x3 / N38 - lamellar magnet
Magnetic properties of material N38
Physical properties of NdFeB
Shopping tips
Thanks to their mighty power, flat magnets are frequently applied in structures that require very strong attraction.
Typical temperature resistance of flat magnets is 80°C, but depending on the dimensions, this value rises.
Moreover, flat magnets commonly have different coatings applied to their surfaces, such as nickel, gold, or chrome, to improve their durability.
The magnet named MPL 20x5x3 / N38 i.e. a lifting capacity of 2.37 kg which weighs just 2.25 grams, making it the ideal choice for projects needing a flat magnet.
Contact surface: Due to their flat shape, flat magnets ensure a larger contact surface with adjacent parts, which can be beneficial in applications needing a stronger magnetic connection.
Technology applications: They are often used in many devices, such as sensors, stepper motors, or speakers, where the thin and wide shape is important for their operation.
Mounting: Their flat shape makes mounting, particularly when it is necessary to attach the magnet to another surface.
Design flexibility: The flat shape of the magnets gives the possibility designers greater flexibility in placing them in devices, which is more difficult with magnets of other shapes.
Stability: In some applications, the flat base of the flat magnet can provide better stability, reducing the risk of shifting or rotating. However, one should remember that the optimal shape of the magnet depends on the specific project and requirements. In some cases, other shapes, like cylindrical or spherical, may be more appropriate.
Magnets have two main poles: north (N) and south (S), which attract each other when they are different. Poles of the same kind, e.g. two north poles, repel each other.
Thanks to this principle of operation, magnets are regularly used in electrical devices, such as motors, speakers, sensors, or magnetic locks. Neodymium magnets stand out with the greatest strength of attraction, making them ideal for applications requiring powerful magnetic fields. Additionally, the strength of a magnet depends on its dimensions and the materials used.
It’s worth noting that extremely high temperatures, above the Curie point, cause a loss of magnetic properties in the magnet. Every magnetic material has its Curie point, meaning that under such conditions, the magnet stops being magnetic. Additionally, strong magnets can interfere with the operation of devices, such as navigational instruments, magnetic stripe cards or medical equipment, like pacemakers. For this reason, it is important to avoid placing magnets near such devices.
Advantages as well as disadvantages of neodymium magnets NdFeB.
Apart from their superior power, neodymium magnets have these key benefits:
- They have unchanged lifting capacity, and over more than 10 years their attraction force decreases symbolically – ~1% (according to theory),
- They protect against demagnetization induced by ambient magnetic fields effectively,
- Because of the lustrous layer of silver, the component looks aesthetically refined,
- The outer field strength of the magnet shows remarkable magnetic properties,
- With the right combination of materials, they reach significant thermal stability, enabling operation at or above 230°C (depending on the design),
- Thanks to the freedom in shaping and the capability to adapt to individual requirements, neodymium magnets can be created in different geometries, which increases their usage potential,
- Wide application in advanced technical fields – they find application in data storage devices, rotating machines, diagnostic apparatus along with technologically developed systems,
- Relatively small size with high magnetic force – neodymium magnets offer intense magnetic field in tiny dimensions, which makes them ideal in miniature devices
Disadvantages of magnetic elements:
- They may fracture when subjected to a sudden impact. If the magnets are exposed to shocks, 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 increases its overall durability,
- High temperatures may significantly reduce the field efficiency of neodymium magnets. Typically, above 80°C, they experience permanent loss in performance (depending on size). To prevent this, we offer heat-resistant magnets marked [AH], capable of working up to 230°C, which makes them perfect for high-temperature use,
- Due to corrosion risk in humid conditions, it is recommended to use sealed magnets made of protective material for outdoor use,
- Limited ability to create internal holes in the magnet – the use of a mechanical support is recommended,
- Safety concern linked to microscopic shards may arise, if ingested accidentally, which is notable in the health of young users. Additionally, minuscule fragments from these assemblies might interfere with diagnostics if inside the body,
- Due to the price of neodymium, their cost is considerably higher,
Maximum lifting force for a neodymium magnet – what contributes to it?
The given strength of the magnet means the optimal strength, assessed in the best circumstances, that is:
- with the use of low-carbon steel plate acting as a magnetic yoke
- of a thickness of at least 10 mm
- with a refined outer layer
- in conditions of no clearance
- with vertical force applied
- under standard ambient temperature
Determinants of lifting force in real conditions
Practical lifting force is dependent on elements, listed from the most critical to the less significant:
- Air gap between the magnet and the plate, since 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.
* Lifting capacity was measured using a polished steel plate of optimal thickness (min. 20 mm), under vertically applied force, in contrast under parallel forces the load capacity is reduced by as much as fivefold. Additionally, even a small distance {between} the magnet and the plate decreases the holding force.
Be Cautious with Neodymium Magnets
Dust and powder from neodymium magnets are highly 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.
Neodymium magnets can become demagnetized at high temperatures.
While Neodymium magnets can demagnetize at high temperatures, it's important to note that the extent of this effect can vary based on factors such as the magnet's material, shape, and intended application.
The magnet is coated with nickel - be careful 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, try wearing gloves or avoid direct contact with nickel-plated neodymium magnets.
Neodymium Magnets can attract to each other due to their immense internal force, causing the skin and other body parts to get pinched and resulting in significant injuries.
Magnets will attract each other within a distance of several to about 10 cm from each other. Remember not to place fingers between magnets or alternatively in their path when attract. Depending on how massive the neodymium magnets are, they can lead to a cut or a fracture.
Neodymium magnets should not be near people with pacemakers.
In the case of neodymium magnets, there is a strong magnetic field. As a result, it interferes with the operation of a heart pacemaker. However, if the magnetic field does not affect the device, it can damage its components or deactivate the device when it is in a magnetic field.
Neodymium magnets are the strongest magnets ever created, and their strength 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.
Under no circumstances should neodymium magnets be brought close to GPS and smartphones.
Magnetic fields can interfere with compasses and magnetometers used in aviation and maritime navigation, as well as internal compasses of smartphones and GPS devices. There are neodymium magnets in every smartphone, for example, in the microphone and speakers.
Neodymium magnets are fragile as well as can easily crack as well as shatter.
Neodymium magnetic are fragile and will break if allowed to collide with each other, even from a distance of a few centimeters. 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.
Keep neodymium magnets away from TV, wallet, and computer HDD.
Neodymium magnets generate intense magnetic fields that 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.
Magnets should not be treated as toys. Therefore, it is not recommended for children to have access to them.
Not all neodymium magnets are toys, so do not let children play with them. Small magnets pose a serious choking hazard or can attract to each other in the intestines. In such cases, the only solution is to undergo surgery to remove the magnets, and otherwise, it can even lead to death.
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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