MP 15x7/3.5x3 / N38 - ring magnet
ring magnet
Catalog no 030182
GTIN: 5906301811992
Diameter [±0,1 mm]
15 mm
internal diameter Ø [±0,1 mm]
7/3.5 mm
Height [±0,1 mm]
3 mm
Weight
6.89 g
Magnetization Direction
↑ axial
Load capacity
0.9 kg / 8.83 N
Magnetic Induction
303.47 mT
Coating
[NiCuNi] nickel
1.747 ZŁ with VAT / pcs + price for transport
1.420 ZŁ net + 23% VAT / pcs
bulk discounts:
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Magnetic properties of material N38
Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C
Shopping tips
Pros as well as cons of neodymium magnets.
Besides their stability, neodymium magnets are valued for these benefits:
- They virtually do not lose strength, because even after ten years the decline in efficiency is only ~1% (based on calculations),
- Magnets perfectly protect themselves against loss of magnetization caused by foreign field sources,
- A magnet with a smooth gold surface looks better,
- The surface of neodymium magnets generates a strong magnetic field – this is a distinguishing feature,
- They are suitable for high-temperature applications, operating effectively at 230°C+ due to advanced heat resistance and form-specific properties,
- Considering the option of flexible shaping and adaptation to custom requirements, NdFeB magnets can be modeled in a broad palette of shapes and sizes, which amplifies use scope,
- Key role in future technologies – they find application in HDD drives, electric motors, medical equipment, and other advanced devices.
- Relatively small size with high pulling force – neodymium magnets offer high power in small dimensions, which enables their usage in miniature devices
Problematic aspects of neodymium magnets and proposals for their use:
- At very strong impacts they can break, therefore we advise placing them in special holders. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
- Neodymium magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of strength (a factor is the shape as well as dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are very resistant to heat
- Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material resistant to moisture, when using outdoors
- Limited ability of making threads in the magnet and complex shapes - recommended is cover - magnet mounting.
- Possible danger to health – tiny shards of magnets pose a threat, if swallowed, which gains importance in the aspect of protecting the youngest. Furthermore, small components of these devices are able to be problematic in diagnostics medical after entering the body.
- Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications
Optimal lifting capacity of a neodymium magnet – what affects it?
The declared magnet strength represents the maximum value, recorded under laboratory conditions, namely:
- using a base made of low-carbon steel, functioning as a ideal flux conductor
- with a cross-section no less than 10 mm
- with a surface free of scratches
- under conditions of gap-free contact (metal-to-metal)
- during pulling in a direction vertical to the plane
- at ambient temperature room level
Practical aspects of lifting capacity – factors
Bear in mind that the application force may be lower subject to elements below, starting with the most relevant:
- Space between magnet and steel – even a fraction of a millimeter of separation (caused e.g. by veneer or unevenness) drastically reduces the pulling force, often by half at just 0.5 mm.
- Force direction – catalog parameter refers to detachment vertically. When applying parallel force, the magnet holds significantly lower power (typically approx. 20-30% of maximum force).
- Wall thickness – thin material does not allow full use of the magnet. Part of the magnetic field passes through the material instead of generating force.
- Material composition – not every steel attracts identically. High carbon content worsen the interaction with the magnet.
- Surface quality – the smoother and more polished the surface, the larger the contact zone and higher the lifting capacity. Roughness acts like micro-gaps.
- Thermal factor – hot environment reduces pulling force. Exceeding the limit temperature can permanently demagnetize the magnet.
* Holding force was measured on the plate surface of 20 mm thickness, when the force acted perpendicularly, whereas under attempts to slide the magnet the lifting capacity is smaller. Additionally, even a minimal clearance {between} the magnet and the plate reduces the holding force.
Exercise Caution 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.
Dust and powder from neodymium magnets are highly flammable.
Avoid drilling or mechanical processing of neodymium magnets. Once crushed into fine powder or dust, this material becomes highly flammable.
Neodymium Magnets can attract to each other, pinch the skin, and cause significant injuries.
Magnets attract each other within a distance of several to around 10 cm from each other. Don't put your fingers in the path of magnet attraction, because a significant injury may occur. Magnets, depending on their size, can even cut off a finger or alternatively there can be a serious pressure or a fracture.
The magnet coating is made of nickel, so be cautious 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.
Do not give neodymium magnets to youngest children.
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.
Neodymium magnetic are highly delicate, they easily fall apart and can crumble.
Neodymium magnets are characterized by considerable fragility. Neodymium magnets are made of metal and coated with a shiny nickel, but they are not as durable as steel. In the event of a collision between two magnets, there may be a scattering of fragments in different directions. Protecting your eyes is crucial in such a situation.
Neodymium magnets are the most powerful, most remarkable magnets on earth, and the surprising force between them can surprise you at first.
Familiarize yourself with our information to correctly handle these magnets and avoid significant injuries to your body and prevent disruption to the magnets.
People with pacemakers are advised to avoid neodymium magnets.
In the case of neodymium magnets, there is a strong magnetic field. As a result, it interferes 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 destroy magnetic storage media such as floppy disks, credit cards, magnetic ID cards, cassette tapes, video tapes, or other devices. They can also damage televisions, VCRs, computer monitors, and CRT displays. Avoid placing neodymium magnets in close proximity to electronic devices.
Avoid bringing neodymium magnets close to a phone or GPS.
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.
Be careful!
In order for you to know how powerful neodymium magnets are and why they are so dangerous, read the article - Dangerous very powerful neodymium magnets.
