Potent magnet MP 12x8/4x3 / N38, ring-shaped, made of neodymium

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MP 12x8/4x3 / N38 - neodymium magnet

ring magnet

catalog number 030395

GTIN: 5906301812326

5.0

external diameter Ø

12 mm [±0,1 mm]

internal diameter Ø

8/4 mm [±0,1 mm]

height

3 mm [±0,1 mm]

magnetizing direction

↑ axial

capacity ~

0.68 kg / 6.67 N

magnetic induction ~

237.19 mT / 2,372 Gs

max. temperature

≤ 80 °C

2.64 ZŁ gross price (including VAT) / pcs +

2.15 ZŁ net price + 23% VAT / pcs

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2.64 ZŁ

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Call us tel: +48 22 499 98 98 or get in touch through contact form on our website. You can check the power as well as the shape of neodymium magnets in our force calculator power calculator

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Specification: ring magnet 12x8/4x3 / N38 ↑ axial

Characteristics: ring magnet 12x8/4x3 / N38 ↑ axial

Properties

Values

catalog number

030395

GTIN

5906301812326

production / distribution

Dhit sp. z o.o.

country of origin

Poland / China / Germany

customs code

85059029

external diameter Ø

12 mm [±0,1 mm]

internal diameter Ø

8/4 mm [±0,1 mm]

height

3 mm [±0,1 mm]

magnetizing direction ?

↑ axial

capacity ~ ?

0.68 kg / 6.67 N

magnetic induction ~ ?

237.19 mT / 2,372 Gs

max. temperature ?

≤ 80 °C

coating type ?

[NiCuNi] nickel

weight

4.24 g

execution tolerance

± 0.1 mm

Magnetic properties of the material N38

material characteristics N38

Properties

Values

units

remenance Br [Min. - Max.] ?

12.2-12.6

kGs

remenance Br [Min. - Max.] ?

1220-1260

coercivity bHc ?

10.8-11.5

kOe

coercivity bHc ?

860-915

kA/m

actual internal force iHc

≥ 12

kOe

actual internal force iHc

≥ 955

kA/m

energy density [Min. - Max.]

36-38

BH max MGOe

energy density [Min. - Max.]

287-303

BH max KJ/m

max. temperature

≤ 80

°C

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B

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

Neodymium magnets MP 12x8/4x3 / N38 in a ring form are frequently used in various industries due to their unique properties. Thanks to a powerful magnetic field of 0.68 kg, which can be described as strength, they are key in applications that require high magnetic power in a relatively small area. Applications of MP 12x8/4x3 / N38 magnets include electric motors, generators, audio systems, and numerous other devices that use magnets for generating motion or storing energy. Despite their powerful strength, they have a comparatively low weight of 4.24 grams, which makes them more convenient to use compared to heavier alternatives.

Ring magnets work due to their 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. Additionally, their resistance to high temperatures and demagnetization makes them indispensable in industry.

They are used in various fields of technology and industry, such as electronics, e.g., in the production of speakers or electric motors, automotive, where they are used in brushless electric motors, and medical equipment, e.g., in scanning devices. Their ability to work in high temperatures and precise magnetic field control makes them ideal for technologically advanced applications.

Their uniqueness comes from extraordinary pulling power, resistance to high temperatures, precise control of the magnetic field. Thanks to their ring shape allows for effective use in devices such as motors or speakers. Moreover, these magnets are significantly stronger and more versatile than ferrite counterparts, 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. They do not lose their magnetic properties, as long as the temperature does not exceed the Curie point. They are more resistant to loss of magnetism than traditional ferrite magnets. Because of this, they are ideal for applications in the automotive industry, robotics, and devices requiring operation in changing or extreme environmental conditions.

Advantages and disadvantages of neodymium magnets NdFeB.

In addition to immense power, neodymium magnets have the following advantages:

They do not lose strength over time. After approximately 10 years, their strength decreases by only ~1% (theoretically),
They are highly resistant to demagnetization by external magnetic sources,
In other words, thanks to the glossy nickel, gold, or silver finish, the element gains an visually attractive appearance,
They exhibit extremely high magnetic induction on the surface of the magnet,
Magnetic neodymium magnets are characterized by very high magnetic induction on the surface of the magnet and can operate (depending on the shape) even at temperatures of 230°C or higher...
Due to the option of accurate forming or adaptation to individual needs – neodymium magnets can be produced in a wide range of shapes and sizes, which amplifies their universality in usage.
Key role in modern technologies – are utilized in computer drives, electric drive mechanisms, medical apparatus or very modern machines.

Disadvantages of neodymium magnets:

They are fragile when subjected to a powerful impact. If the magnets are exposed to impacts, we recommend using magnets in a protective case. The steel housing in the form of a holder protects the magnet from impacts, and at the same time increases its overall strength,
Magnets lose their power due to exposure to high temperatures. In most cases, when the temperature exceeds 80°C, these magnets experience permanent loss in strength (although it is worth noting that this is dependent on the form and size of the magnet). To avoid this problem, we offer special magnets marked with the [AH] symbol, which exhibit high temperature resistance. They can operate even at temperatures as high as 230°C or more,
Magnets exposed to a humid environment can corrode. Therefore, when using them outdoors, we recommend using waterproof magnets made of rubber, plastic, or other moisture-resistant materials,
Limited ability to create threads or complex shapes in the magnet - the use of a housing is recommended - magnetic holder
Possible danger to health from tiny fragments of magnets are risky, if swallowed, which is crucial in the aspect of protecting young children. It's also worth noting that small elements of these devices can complicate diagnosis in case of swallowing.

Handle with Care: Neodymium Magnets

The magnet is coated with nickel - be careful 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.

Neodymium magnets can demagnetize at high temperatures.

In certain circumstances, Neodymium magnets may experience demagnetization when subjected to high temperatures.

Under no circumstances should neodymium magnets be placed near a computer HDD, TV, and wallet.

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, etc. devices. They can also destroy videos, televisions, CRT computer monitors. Remember not to place neodymium magnets close to these electronic devices.

Neodymium magnets are primarily characterized by their significant internal force. They attract to each other, and any object that comes in their way will be affected.

Magnets will bounce and clash together within a distance of several to almost 10 cm from each other.

Neodymium magnets are over 10 times stronger than ferrite magnets (the ones in speakers), and their power 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.

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.

Keep neodymium magnets away from people with pacemakers.

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.

Magnets are not toys, youngest should not play with them.

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.

Under no circumstances should neodymium magnets be brought close to 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.

Neodymium magnetic are highly susceptible to damage, resulting in breaking.

Neodymium magnets are characterized by significant fragility. Magnets made of neodymium 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.

To illustrate why neodymium magnets are so dangerous, read the article - How dangerous are powerful neodymium magnets?.

MP 12x8/4x3 / N38 - neodymium magnet

ring magnet

Specification: ring magnet 12x8/4x3 / N38 ↑ axial

Magnetic properties of the material N38

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B

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cylindrical magnet 16x3 / N38 ↑ axial

magnetic separator with handle 32x250 / N52

Advantages and disadvantages of neodymium magnets NdFeB.

MP 12x8/4x3 / N38 - neodymium magnet

ring magnet

Specification: ring magnet 12x8/4x3 / N38 ↑ axial

Magnetic properties of the material N38

Physical properties of sintered neodymium magnets Nd2Fe14B

Recommended articles for purchase

lamellar magnet 40x18x10 SH / N38 ↑ axial

magnetic separator 32x425 [2xM8] / N52

cylindrical magnet 16x3 / N38 ↑ axial

magnetic separator with handle 32x250 / N52

Advantages and disadvantages of neodymium magnets NdFeB.

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B