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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

1.75 ZŁ with VAT / pcs + price for transport

1.42 ZŁ net + 23% VAT / pcs

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MP 15x7/3.5x3 / N38 - ring magnet

Specification/characteristics MP 15x7/3.5x3 / N38 - ring magnet

properties

values

Cat. no.

030182

GTIN

5906301811992

Production/Distribution

Dhit sp. z o.o.

Country of origin

Poland / China / Germany

Customs code

85059029

Diameter

15 mm [±0,1 mm]

internal diameter Ø

7/3.5 mm [±0,1 mm]

Height

3 mm [±0,1 mm]

Weight

6.89 g [±0,1 mm]

Magnetization Direction

↑ axial

Load capacity ~ ?

0.9 kg / 8.83 N

Magnetic Induction ~ ?

303.47 mT

Coating

[NiCuNi] nickel

Manufacturing Tolerance

± 0.1 mm

Magnetic properties of material N38

properties

values

units

coercivity bHc ?

860-915

kA/m

coercivity bHc ?

10.8-11.5

kOe

energy density [Min. - Max.] ?

287-303

BH max KJ/m

energy density [Min. - Max.] ?

36-38

BH max MGOe

remenance Br [Min. - Max.] ?

12.2-12.6

kGs

remenance Br [Min. - Max.] ?

1220-1260

actual internal force iHc

≥ 955

kA/m

actual internal force iHc

≥ 12

kOe

max. temperature ?

≤ 80

°C

Physical properties of NdFeB

properties

values

units

Vickers hardness

≥550

Density

≥7.4

g/cm³

Curie Temperature TC

312 - 380

°C

Curie Temperature TF

593 - 716

°F

Specific resistance

150

μΩ⋅Cm

Bending strength

250

Mpa

Compressive strength

1000~1100

Mpa

Thermal expansion parallel (∥) to orientation (M)

(3-4) x 106

°C^-1

Thermal expansion perpendicular (⊥) to orientation (M)

-(1-3) x 10-6

°C^-1

Young's modulus

1.7 x 104

kg/mm²

Shopping tips

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Due to unique properties, neodymium element MP 15x7/3.5x3 / N38 in a ring form finds extensive use in various industries. Thanks to a powerful magnetic field of 0.9 kg, which can be described as lifting capacity, they are very helpful in applications that require strong magnetism in a compact space. Usage of MP 15x7/3.5x3 / N38 magnets include electric motors, generating systems, audio systems, and many other devices that use magnets for producing motion or energy storage. Despite their powerful strength, they have a relatively low weight of 6.89 grams, which makes them more convenient to use compared to bulkier alternatives.

The operation of ring magnets results from their unique atomic structure. Their properties arise from a controlled production process, including sintering and magnetization, which allows for generating a strong and precise magnetic field. This makes them perfect for devices such as stepper motors or industrial robots. Moreover, their resistance to high temperatures and demagnetization makes them indispensable in industry.

They are used in various fields of technology and industry, such as production of electronic devices, such as speakers and electric motors, the automotive industry, e.g., in the construction of electric motors, and medicine, where they are used in precision diagnostic devices. Thanks to their temperature resistance and precision makes them ideal for technologically advanced applications.

Ring magnets stand out extraordinary pulling power, resistance to high temperatures, and precision in generating the magnetic field. Their unique ring form allows for application in devices requiring concentrated magnetic fields. Moreover, these magnets are significantly stronger and more versatile than ferrite counterparts, making them an ideal choice in the automotive, electronics, and medical industries.

Thanks to their resistance to high temperatures, ring magnets operate reliably even in tough conditions. They do not lose their magnetic properties, until the Curie temperature is exceeded, which for neodymium magnets is around 80°C. Compared to other types of magnets, ring magnets show greater resistance to demagnetization. Because of this, they are ideal for applications in the automotive industry, robotics, and devices requiring operation in changing or extreme environmental conditions.

A neodymium ring magnet with classification N50 and N52 is a strong and extremely powerful magnetic product shaped like a ring, that offers high force and universal application. Very good price, availability, ruggedness and versatility.

Advantages as well as disadvantages of neodymium magnets NdFeB.

Apart from their consistent power, neodymium magnets have these key benefits:

They have unchanged lifting capacity, and over nearly 10 years their attraction force decreases symbolically – ~1% (according to theory),
They show strong resistance to demagnetization from outside magnetic sources,
Thanks to the polished finish and silver coating, they have an visually attractive appearance,
The outer field strength of the magnet shows advanced magnetic properties,
With the right combination of compounds, they reach significant thermal stability, enabling operation at or above 230°C (depending on the form),
Thanks to the possibility in shaping and the capability to adapt to specific requirements, neodymium magnets can be created in various configurations, which broadens their application range,
Significant impact in cutting-edge sectors – they are utilized in data storage devices, rotating machines, clinical machines or even technologically developed systems,
Thanks to their concentrated strength, small magnets offer high magnetic performance, while occupying minimal space,

Disadvantages of rare earth magnets:

They are prone to breaking when subjected to a powerful impact. If the magnets are exposed to external force, they should be placed in a protective enclosure. The steel housing, in the form of a holder, protects the magnet from cracks and strengthens its overall robustness,
High temperatures may significantly reduce the strength of neodymium magnets. Typically, above 80°C, they experience permanent deterioration 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,
Magnets exposed to damp air can degrade. Therefore, for outdoor applications, we suggest waterproof types made of coated materials,
Using a cover – such as a magnetic holder – is advised due to the challenges in manufacturing fine shapes directly in the magnet,
Health risk linked to microscopic shards may arise, if ingested accidentally, which is important in the context of child safety. Furthermore, miniature parts from these assemblies might interfere with diagnostics once in the system,
Due to a complex production process, their cost is above average,

Safety Precautions

Neodymium magnets are among the strongest magnets on Earth. The surprising force they generate between each other can surprise you.

To use 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.

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, try wearing gloves or avoid direct contact with nickel-plated neodymium magnets.

Neodymium magnets are known for their fragility, which can cause them to become damaged.

Neodymium magnets are characterized by significant fragility. Neodymium magnets are made of metal and coated with a shiny nickel surface, but they are not as hard 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.

Keep neodymium magnets away from people with pacemakers.

Neodymium magnets generate very strong magnetic fields that can interfere with the operation of a pacemaker. This is because many of these devices are equipped with a function that deactivates the device in a magnetic field.

Neodymium magnets can demagnetize 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.

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.

Never bring neodymium magnets close to a phone and GPS.

Neodymium magnets are a source of strong magnetic fields that cause interference with magnetometers and compasses used in navigation, as well as internal compasses of smartphones and GPS devices.

Magnets will attract to each other, so remember not to allow them to pinch together without control or place your fingers in their path.

Magnets attract each other within a distance of several to around 10 cm from each other. Remember not to put fingers between magnets or in their path when attract. Magnets, depending on their size, are able even cut off a finger or there can be a serious pressure or a fracture.

Neodymium magnets should not be around children.

Not all neodymium magnets are toys, so do not let children play with them. In such a situation, surgery is necessary to remove them. In the worst case scenario, it can result in death.

Keep neodymium magnets away from the wallet, computer, and TV.

Strong 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.

Exercise caution!

To show why neodymium magnets are so dangerous, see the article - How dangerous are very powerful neodymium magnets?.