UMT 20x25 black / N38 - board holder
board holder
Catalog no 230263
GTIN: 5906301814269
Diameter Ø [±0,1 mm]
20 mm
Height [±0,1 mm]
25 mm
Weight
7 g
Coating
[NiCuNi] nickel
3.49 ZŁ with VAT / pcs + price for transport
2.84 ZŁ net + 23% VAT / pcs
bulk discounts:
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UMT 20x25 black / N38 - board holder
Magnetic properties of material N38
Physical properties of NdFeB
Shopping tips
Advantages as well as disadvantages of neodymium magnets NdFeB.
Apart from their consistent magnetic energy, neodymium magnets have these key benefits:
- They have constant strength, and over more than 10 years their attraction force decreases symbolically – ~1% (according to theory),
- They remain magnetized despite exposure to strong external fields,
- Because of the brilliant layer of gold, the component looks high-end,
- The outer field strength of the magnet shows remarkable magnetic properties,
- These magnets tolerate high temperatures, often exceeding 230°C, when properly designed (in relation to profile),
- The ability for custom shaping or customization to individual needs – neodymium magnets can be manufactured in many forms and dimensions, which extends the scope of their use cases,
- Key role in cutting-edge sectors – they are used in HDDs, rotating machines, healthcare devices or even other advanced devices,
- Thanks to their power density, small magnets offer high magnetic performance, in miniature format,
Disadvantages of NdFeB magnets:
- They can break when subjected to a sudden impact. If the magnets are exposed to physical collisions, it is advisable to use in a steel housing. The steel housing, in the form of a holder, protects the magnet from fracture and additionally reinforces its overall durability,
- High temperatures may significantly reduce the holding force of neodymium magnets. Typically, above 80°C, they experience permanent weakening in performance (depending on form). 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 damp environment, especially when used outside, we recommend using encapsulated magnets, such as those made of rubber,
- The use of a protective casing or external holder is recommended, since machining threads in neodymium magnets is difficult,
- Health risk from tiny pieces may arise, especially if swallowed, which is important in the protection of children. Furthermore, tiny components from these products have the potential to interfere with diagnostics once in the system,
- In cases of tight budgets, neodymium magnet cost may not be economically viable,
Safety Precautions
Neodymium magnets can become demagnetized 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.
You should maintain neodymium magnets at a safe distance from the wallet, computer, and TV.
Magnetic fields generated by neodymium magnets can damage magnetic storage media such as floppy disks, credit cards, magnetic ID cards, cassette tapes, video tapes, or other similar devices. In addition, they can damage televisions, VCRs, computer monitors, and CRT displays. Avoid placing neodymium magnets in close proximity to electronic devices.
Magnets are not toys, youngest 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.
Keep neodymium magnets as far away as possible from GPS and smartphones.
Magnetic fields interfere with compasses and magnetometers used in navigation for air and sea transport, as well as internal compasses of smartphones and GPS devices.
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 can attract to each other, pinch the skin, and cause significant swellings.
Magnets attract each other within a distance of several to about 10 cm from each other. Don't put your fingers in the path of magnet attraction, because a serious injury may occur. Magnets, depending on their size, can even cut off a finger or alternatively there can be a serious pressure or even a fracture.
People with pacemakers are advised to avoid neodymium magnets.
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.
Magnets made of neodymium are especially fragile, resulting in their breakage.
Neodymium magnets are characterized by significant fragility. Neodymium magnets are made of metal and coated with a shiny nickel, but they are not as durable as steel. At the moment of collision between the magnets, sharp metal fragments can be dispersed in different directions.
Comparing neodymium magnets to ferrite magnets (found in speakers), they are 10 times stronger, and their strength 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 coating contains nickel, so be cautious if you have a nickel 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.
Safety precautions!
In order to illustrate why neodymium magnets are so dangerous, see the article - How very dangerous are strong neodymium magnets?.