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MP 20x8x5 / N38 - ring magnet

ring magnet

Catalog no 030188

GTIN: 5906301812050

Diameter [±0,1 mm]

20 mm

internal diameter Ø [±0,1 mm]

8 mm

Height [±0,1 mm]

5 mm

Weight

14.14 g

Magnetization Direction

↑ axial

Load capacity

2.28 kg / 22.36 N

Magnetic Induction

206.25 mT

Coating

[NiCuNi] nickel

3.44 ZŁ with VAT / pcs + price for transport

2.80 ZŁ net + 23% VAT / pcs

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MP 20x8x5 / N38 - ring magnet

Specification/characteristics MP 20x8x5 / N38 - ring magnet

properties

values

Cat. no.

030188

GTIN

5906301812050

Production/Distribution

Dhit sp. z o.o.

Country of origin

Poland / China / Germany

Customs code

85059029

Diameter

20 mm [±0,1 mm]

internal diameter Ø

8 mm [±0,1 mm]

Height

5 mm [±0,1 mm]

Weight

14.14 g [±0,1 mm]

Magnetization Direction

↑ axial

Load capacity ~ ?

2.28 kg / 22.36 N

Magnetic Induction ~ ?

206.25 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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Due to unique properties, MP 20x8x5 / N38 in a ring-shaped form finds extensive use in various industries. Thanks to a powerful magnetic field of 2.28 kg, which can be described as lifting capacity, they are extremely useful in applications that require strong magnetism in a compact space. Applications of MP 20x8x5 / N38 magnets include electrical mechanisms, generating systems, sound devices, and several other devices that use magnets for generating motion or storing energy. Despite their powerful strength, they have a relatively low weight of 14.14 grams, which makes them more convenient to use compared to bulkier alternatives.

Ring magnets work due to their atomic structure. In the production process, neodymium atoms are arranged appropriately, which allows for generating a strong and precise magnetic field. 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.

Ring magnets have a wide range of applications in many industries, such as electronics, e.g., in the production of speakers or electric motors, the automotive industry, e.g., in the construction of electric motors, and medical equipment, e.g., in scanning devices. Their ability to work in high temperatures and precise magnetic field control makes them indispensable in challenging industrial conditions.

Their uniqueness comes from extraordinary pulling power, ability to work in extreme conditions, 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.

Ring magnets perform excellently across a wide range of temperatures. 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. For this reason, they are ideal for applications in the automotive industry, robotics, and devices requiring operation in changing or extreme environmental conditions.

A ring magnet of class N52 and N50 is a strong and powerful metallic component with the shape of a ring, providing high force and broad usability. Good price, 24h delivery, durability and multi-functionality.

Advantages and disadvantages of neodymium magnets NdFeB.

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

They have stable power, and over around 10 years their attraction force decreases symbolically – ~1% (according to theory),
Their ability to resist magnetic interference from external fields is notable,
In other words, due to the shiny gold coating, the magnet obtains an stylish appearance,
They possess significant magnetic force measurable at the magnet’s surface,
With the right combination of compounds, they reach significant thermal stability, enabling operation at or above 230°C (depending on the design),
Thanks to the flexibility in shaping and the capability to adapt to specific requirements, neodymium magnets can be created in various configurations, which expands their functional possibilities,
Important function in modern technologies – they find application in data storage devices, electric motors, medical equipment as well as high-tech tools,
Thanks to their concentrated strength, small magnets offer high magnetic performance, while occupying minimal space,

Disadvantages of magnetic elements:

They are prone to breaking when subjected to a heavy impact. If the magnets are exposed to physical collisions, it is suggested to place them in a protective case. The steel housing, in the form of a holder, protects the magnet from damage , and at the same time increases its overall strength,
They lose magnetic force at high temperatures. Most neodymium magnets experience permanent loss in strength when heated above 80°C (depending on the dimensions and height). However, we offer special variants with high temperature resistance that can operate up to 230°C or higher,
They rust in a humid environment – during 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 fine details in neodymium magnets is risky,
Possible threat linked to microscopic shards may arise, especially if swallowed, which is crucial in the family environments. Additionally, small elements from these assemblies might complicate medical imaging once in the system,
High unit cost – neodymium magnets are costlier than other types of magnets (e.g., ferrite), which can restrict large-scale applications

Handle Neodymium Magnets Carefully

Never bring neodymium magnets close to a phone and 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.

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

If the joining of neodymium magnets is not controlled, then they may crumble and also crack. You can't move them to each other. At a distance less than 10 cm you should hold them extremely firmly.

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.

It is essential to maintain neodymium magnets out of reach from 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.

Magnets made of neodymium are extremely delicate, they easily fall apart and can crumble.

Neodymium magnets are extremely delicate, and by joining them in an uncontrolled manner, they will break. Neodymium magnetic 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 strongest magnets ever invented. Their strength can surprise you.

To handle 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.

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.

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.

Neodymium magnets are not recommended for people with pacemakers.

Neodymium magnets generate strong magnetic fields. As a result, they 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.

Dust and powder from neodymium magnets are highly 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.

Be careful!

So you are aware of why neodymium magnets are so dangerous, see the article titled How very dangerous are strong neodymium magnets?.