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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

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Neodymium magnets MP 15x7/3.5x3 / N38 in a ring-shaped form are regularly used in various industries due to their specific properties. Thanks to a powerful magnetic field of 0.9 kg, which can be described as lifting capacity, they are extremely useful in applications that require high magnetic power in a relatively small area. Usage of MP 15x7/3.5x3 / N38 magnets include electrical mechanisms, generating systems, audio systems, and many other devices that use magnets for generating motion or energy storage. Despite their significant strength, they have a relatively low weight of 6.89 grams, which makes them more practical compared to heavier alternatives.

The operation of ring magnets results from their unique atomic structure. In the production process, neodymium atoms are arranged appropriately, which allows for the creation of a concentrated magnetic field in a specific direction. 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, automotive, where they are used in brushless electric motors, and medical equipment, e.g., in scanning devices. Thanks to their temperature resistance and precision makes them indispensable in challenging industrial conditions.

Ring magnets stand out high magnetic strength, resistance to high temperatures, and precision in generating the magnetic field. Their unique ring form allows for effective use in devices such as motors or speakers. Additionally, these magnets are more durable than traditional ferrite magnets, which has made them popular in advanced technologies and industrial applications.

Thanks to their resistance to high temperatures, ring magnets operate reliably even in tough conditions. Their magnetic properties remain stable, as long as the temperature does not exceed the Curie point. 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 magnet in classes N50 and N52 is a powerful and highly strong magnetic piece with the shape of a ring, that provides strong holding power and versatile application. Attractive price, 24h delivery, durability and versatility.

Advantages as well as disadvantages of neodymium magnets NdFeB.

In addition to their remarkable field intensity, neodymium magnets offer the following advantages:

They have stable power, and over nearly 10 years their performance decreases symbolically – ~1% (in testing),
They are extremely resistant to demagnetization caused by external magnetic fields,
Because of the reflective layer of silver, the component looks high-end,
They exhibit elevated levels of magnetic induction near the outer area of the magnet,
They are suitable for high-temperature applications, operating effectively at 230°C+ due to advanced heat resistance and form-specific properties,
Thanks to the flexibility in shaping and the capability to adapt to individual requirements, neodymium magnets can be created in different geometries, which expands their application range,
Important function in cutting-edge sectors – they find application in computer drives, electromechanical systems, diagnostic apparatus or even other advanced devices,
Thanks to their concentrated strength, small magnets offer high magnetic performance, in miniature format,

Disadvantages of neodymium magnets:

They are prone to breaking when subjected to a powerful impact. If the magnets are exposed to external force, it is suggested to place them in a protective case. The steel housing, in the form of a holder, protects the magnet from cracks and additionally strengthens its overall durability,
Magnets lose pulling force when exposed to temperatures exceeding 80°C. In most cases, this leads to irreversible power drop (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,
Magnets exposed to moisture can degrade. Therefore, for outdoor applications, we recommend waterproof types made of coated materials,
The use of a protective casing or external holder is recommended, since machining fine details in neodymium magnets is risky,
Health risk from tiny pieces may arise, if ingested accidentally, which is notable in the health of young users. It should also be noted that small elements from these products might hinder health screening if inside the body,
Due to expensive raw materials, their cost is above average,

Precautions

Neodymium magnets can attract to each other, pinch the skin, and cause significant injuries.

Neodymium magnets bounce and also clash mutually within a distance of several to almost 10 cm from each other.

Do not give neodymium magnets to youngest children.

Remember that 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 should not be near people with pacemakers.

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.

Magnets made of neodymium are particularly delicate, which leads to shattering.

Neodymium magnetic are extremely delicate, and by joining them in an uncontrolled manner, they will break. 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.

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.

Dust and powder from neodymium magnets are highly flammable.

Avoid drilling or mechanical processing of neodymium magnets. If the magnet is crushed into fine powder or dust, it becomes highly flammable.

Comparing neodymium magnets to ferrite magnets (found in speakers), they are 10 times stronger, and their power can surprise you.

Please review the information on how to handle neodymium magnets and avoid significant harm to your body, as well as prevent unintentional disruption to the magnets.

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.

Do not place neodymium magnets near a computer HDD, TV, and wallet.

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.

The magnet coating contains nickel, so be cautious if you have a nickel 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, you can try wearing gloves or simply avoid direct contact with nickel-plated neodymium magnets.

Pay attention!

So that know how strong neodymium magnets are and why they are so dangerous, see the article - Dangerous very powerful neodymium magnets.