UMT 20x25 white / N38 - board holder
board holder
Catalog no 230262
GTIN: 5906301814252
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
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Lifting power as well as shape of neodymium magnets can be tested on our
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UMT 20x25 white / 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 superior magnetic energy, neodymium magnets have these key benefits:
- They do not lose their even during nearly ten years – the reduction of power is only ~1% (theoretically),
- They remain magnetized despite exposure to strong external fields,
- By applying a bright layer of nickel, the element gains a sleek look,
- They exhibit extremely high levels of magnetic induction near the outer area 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 accurate shaping as well as adjustment to individual needs – neodymium magnets can be manufactured in a wide range of shapes and sizes, which enhances their versatility in applications,
- Significant impact in cutting-edge sectors – they are used in hard drives, rotating machines, diagnostic apparatus along with technologically developed systems,
- Relatively small size with high magnetic force – neodymium magnets offer intense magnetic field in small dimensions, which allows for use in compact constructions
Disadvantages of magnetic elements:
- They can break when subjected to a sudden impact. If the magnets are exposed to physical collisions, they should be placed in a protective enclosure. The steel housing, in the form of a holder, protects the magnet from cracks and additionally reinforces its overall strength,
- Magnets lose field strength when exposed to temperatures exceeding 80°C. In most cases, this leads to irreversible magnetic decay (influenced by the magnet’s profile). To address this, we provide [AH] models with superior thermal resistance, able to operate even at 230°C or more,
- They rust in a moist environment. For outdoor use, we recommend using waterproof 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 restricted,
- Health risk due to small fragments may arise, if ingested accidentally, which is notable in the context of child safety. Furthermore, small elements from these assemblies may complicate medical imaging if inside the body,
- High unit cost – neodymium magnets are pricier than other types of magnets (e.g., ferrite), which may limit large-scale applications
Maximum lifting capacity of the magnet – what affects it?
The given pulling force of the magnet corresponds to the maximum force, measured in a perfect environment, namely:
- with the use of low-carbon steel plate serving as a magnetic yoke
- having a thickness of no less than 10 millimeters
- with a refined outer layer
- with no separation
- in a perpendicular direction of force
- under standard ambient temperature
Lifting capacity in real conditions – factors
In practice, the holding capacity of a magnet is affected by these factors, in descending order of importance:
- Air gap between the magnet and the plate, since even a very small distance (e.g. 0.5 mm) causes 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 testing was performed on plates with a smooth surface of suitable thickness, under a perpendicular pulling force, however under shearing force the holding force is lower. Additionally, even a slight gap {between} the magnet’s surface and the plate decreases the holding force.
Be Cautious with 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.
Neodymium magnets are the strongest magnets ever invented. Their strength can shock 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.
Keep neodymium magnets away from the wallet, computer, and TV.
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 damage videos, televisions, CRT computer monitors. Do not forget to keep neodymium magnets at a safe distance from these electronic devices.
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.
Magnets are not toys, youngest should not play with them.
Neodymium magnets are not toys. You cannot allow them to become toys for children. 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.
Neodymium magnets can attract to each other, pinch the skin, and cause significant injuries.
If you have a finger between or on the path of attracting magnets, there may be a severe cut or even a fracture.
Neodymium magnetic are extremely fragile, they easily fall apart and can crumble.
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.
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. 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.
If you have a nickel allergy, avoid contact with neodymium magnets.
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, you can try wearing gloves or simply avoid direct contact with nickel-plated neodymium magnets.
Do not bring neodymium magnets 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.
Warning!
Please read the article - What danger lies in neodymium magnets? You will learn how to handle them properly.