MW 20x18 / N38 - cylindrical magnet
cylindrical magnet
Catalog no 010040
GTIN: 5906301810391
Diameter Ø [±0,1 mm]
20 mm
Height [±0,1 mm]
18 mm
Weight
42.41 g
Magnetization Direction
↑ axial
Load capacity
19.91 kg / 195.25 N
Magnetic Induction
541.64 mT
Coating
[NiCuNi] nickel
23.54 ZŁ with VAT / pcs + price for transport
19.14 ZŁ net + 23% VAT / pcs
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MW 20x18 / N38 - cylindrical magnet
Magnetic properties of material N38
Physical properties of NdFeB
Shopping tips
Moreover, although neodymium is a component of the strongest magnets, they are susceptible to corrosion in humid environments. For this reason, they are coated with a coating of nickel to protect them from corrosion. It's worth noting that NdFeB neodymium magnets are about 13% lighter than SmCo magnets and, despite their power, are brittle, which requires special caution during their handling. Therefore, any mechanical processing should be done before they are magnetized.
In terms of safety, there are several recommendations regarding the use of these magnets. They should not be used in acidic, basic, organic environments or where solvents are present, as well as in water or oil. Furthermore, they can damage data on magnetic cards and hard drives, although data deletion using a neodymium magnet is not guaranteed.
In terms of properties in different environments, neodymium magnets are susceptible to corrosion, especially in conditions of high humidity. Therefore, they are often covered with coatings, such as epoxy, to preserve them from environmental factors and prolong their durability. High temperatures exceeding 130°C can cause a reduction of their magnetic properties, although there are particular types of neodymium magnets that can withstand temperatures up to 230°C.
As for potential dangers, it is important to avoid using neodymium magnets in acidic environments, basic environments, organic or solvent environments, unless they are adequately insulated. Additionally, their use is not recommended in wet conditions, oil, or in an atmosphere containing hydrogen, as they may lose their magnetic strength.
Advantages as well as disadvantages of neodymium magnets NdFeB.
Besides their stability, neodymium magnets are valued for these benefits:
- They do not lose their even during approximately ten years – the loss of lifting capacity is only ~1% (theoretically),
- Their ability to resist magnetic interference from external fields is among the best,
- By applying a reflective layer of nickel, the element gains a clean look,
- Magnetic induction on the surface of these magnets is notably high,
- Thanks to their high temperature resistance, they can operate (depending on the geometry) even at temperatures up to 230°C or more,
- Thanks to the freedom in shaping and the capability to adapt to individual requirements, neodymium magnets can be created in different geometries, which expands their functional possibilities,
- Important function in cutting-edge sectors – they are utilized in data storage devices, electric motors, healthcare devices or even other advanced devices,
- Relatively small size with high magnetic force – neodymium magnets offer intense magnetic field in small dimensions, which makes them ideal in miniature devices
Disadvantages of neodymium magnets:
- They can break when subjected to a powerful impact. If the magnets are exposed to physical collisions, we recommend in a protective case. The steel housing, in the form of a holder, protects the magnet from fracture and reinforces its overall resistance,
- High temperatures may significantly reduce the holding force of neodymium magnets. Typically, above 80°C, they experience permanent decline 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,
- They rust in a wet environment. If exposed to rain, we recommend using moisture-resistant magnets, such as those made of polymer,
- The use of a protective casing or external holder is recommended, since machining fine details in neodymium magnets is difficult,
- Safety concern due to small fragments may arise, in case of ingestion, which is crucial in the context of child safety. Furthermore, minuscule fragments from these devices have the potential to disrupt scanning when ingested,
- In cases of tight budgets, neodymium magnet cost may be a barrier,
Maximum magnetic pulling force – what affects it?
The given holding capacity of the magnet represents the highest holding force, determined under optimal conditions, specifically:
- using a steel plate with low carbon content, serving as a magnetic circuit closure
- with a thickness of minimum 10 mm
- with a refined outer layer
- in conditions of no clearance
- in a perpendicular direction of force
- in normal thermal conditions
Impact of factors on magnetic holding capacity in practice
In practice, the holding capacity of a magnet is affected by the following aspects, arranged from the most important to the least relevant:
- 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 determined by applying a smooth steel plate of optimal thickness (min. 20 mm), under vertically applied force, in contrast under parallel forces the lifting capacity is smaller. In addition, even a minimal clearance {between} the magnet and the plate reduces the lifting capacity.
Exercise Caution with Neodymium Magnets
Neodymium magnetic are extremely fragile, resulting in breaking.
Magnets made of neodymium are fragile as well as will crack 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. At the moment of collision between the magnets, tiny sharp metal fragments can be propelled in various directions at high speed. Eye protection is recommended.
Neodymium magnets are among the strongest magnets on Earth. The astonishing force they generate between each other can surprise you.
To handle 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 is coated with nickel - be careful if you have an allergy.
Studies show a small percentage of people have allergies to certain metals, including 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.
Dust and powder from neodymium magnets are flammable.
Avoid drilling or mechanical processing of neodymium magnets. If the magnet is crushed into fine powder or dust, it becomes highly flammable.
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.
If have a finger between or alternatively on the path of attracting magnets, there may be a serious cut or even a fracture.
Keep neodymium magnets away from youngest children.
Neodymium magnets are not toys. Do not allow children to play with them. In the case of swallowing multiple magnets simultaneously, they can attract to each other through the intestinal walls. In the worst case scenario, this can lead to death.
Neodymium magnets can become demagnetized at high temperatures.
Although magnets have shown to retain their effectiveness up to 80°C or 175°F, this temperature may vary depending on the type of material, shape, and intended use of the magnet.
People with pacemakers are advised to avoid neodymium magnets.
Neodymium magnets produce strong magnetic fields that can interfere with the operation of a heart pacemaker. Even if the magnetic field does not affect the device, it can damage its components or deactivate the entire device.
Do not place neodymium magnets near a computer HDD, TV, and wallet.
Strong magnetic fields emitted by neodymium magnets can damage magnetic storage media such as floppy disks, credit cards, magnetic ID cards, cassette tapes, video tapes, or other devices. In addition, they can damage televisions, VCRs, computer monitors, and CRT displays. Avoid placing neodymium magnets in close proximity to electronic devices.
Keep neodymium magnets away from GPS and smartphones.
Magnetic fields generated by neodymium magnets interfere with compasses and magnetometers used in navigation, as well as internal compasses of smartphones and GPS devices.
Caution!
To raise awareness of why neodymium magnets are so dangerous, read the article titled How very dangerous are very strong neodymium magnets?.
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