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MP 25x13x4 / N38 - ring magnet

ring magnet

Catalog no 030190

GTIN: 5906301812074

Diameter [±0,1 mm]

25 mm

internal diameter Ø [±0,1 mm]

13 mm

Height [±0,1 mm]

4 mm

Weight

11.31 g

Magnetization Direction

↑ axial

Load capacity

2.96 kg / 29.03 N

Magnetic Induction

135.80 mT

Coating

[NiCuNi] nickel

6.76 ZŁ with VAT / pcs + price for transport

5.50 ZŁ net + 23% VAT / pcs

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MP 25x13x4 / N38 - ring magnet

Specification/characteristics MP 25x13x4 / N38 - ring magnet

properties

values

Cat. no.

030190

GTIN

5906301812074

Production/Distribution

Dhit sp. z o.o.

Country of origin

Poland / China / Germany

Customs code

85059029

Diameter

25 mm [±0,1 mm]

internal diameter Ø

13 mm [±0,1 mm]

Height

4 mm [±0,1 mm]

Weight

11.31 g [±0,1 mm]

Magnetization Direction

↑ axial

Load capacity ~ ?

2.96 kg / 29.03 N

Magnetic Induction ~ ?

135.80 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, neodymium magnet MP 25x13x4 / N38 in a ring form finds extensive use in various industries. Thanks to a powerful magnetic field of 2.96 kg, which can be described as lifting capacity, they are very helpful in applications that require strong magnetism in a compact space. Applications of MP 25x13x4 / N38 magnets include electric motors, generating systems, sound devices, and several other devices that use magnets for generating motion or energy storage. Despite their significant strength, they have a relatively low weight of 11.31 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 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. Thanks to their temperature resistance and precision 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 application in devices requiring concentrated magnetic fields. Moreover, these magnets are more durable than traditional ferrite magnets, making them an ideal choice in the automotive, electronics, and medical industries.

Ring magnets perform excellently across a wide range of temperatures. Their magnetic properties remain stable, 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 N50 and N52 is a strong and powerful magnetic piece in the form of a ring, that provides strong holding power and universal application. Attractive price, fast shipping, durability and broad range of uses.

Advantages as well as disadvantages of neodymium magnets NdFeB.

In addition to their tremendous pulling force, neodymium magnets offer the following advantages:

They retain their attractive force for nearly ten years – the drop is just ~1% (according to analyses),
They protect against demagnetization induced by external magnetic fields remarkably well,
Thanks to the shiny finish and gold coating, they have an aesthetic appearance,
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 various configurations, which expands their application range,
Significant impact in new technology industries – they are used in computer drives, electromechanical systems, clinical machines and other advanced devices,
Relatively small size with high magnetic force – neodymium magnets offer impressive pulling strength in compact dimensions, which makes them ideal in miniature devices

Disadvantages of rare earth magnets:

They can break when subjected to a sudden impact. If the magnets are exposed to physical collisions, we recommend in a metal holder. The steel housing, in the form of a holder, protects the magnet from damage and reinforces its overall robustness,
Magnets lose field strength when exposed to temperatures exceeding 80°C. In most cases, this leads to irreversible field weakening (influenced by the magnet’s form). To address this, we provide [AH] models with superior thermal resistance, able to operate even at 230°C or more,
They rust in a damp environment. If exposed to rain, we recommend using moisture-resistant magnets, such as those made of non-metallic materials,
Limited ability to create threads in the magnet – the use of a housing is recommended,
Safety concern related to magnet particles may arise, if ingested accidentally, which is important in the family environments. Furthermore, miniature parts from these products may hinder health screening after being swallowed,
In cases of mass production, neodymium magnet cost may be a barrier,

Exercise Caution with Neodymium Magnets

Do not give neodymium magnets to children.

Remember that neodymium magnets are not toys. Be cautious and make sure no child plays 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.

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.

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

Read the information on our website on how to properly utilize neodymium magnets and avoid significant harm to your body and unintentional disruption to the magnets.

Neodymium magnets can attract to each other due to their immense internal force, causing the skin and other body parts to get pinched and resulting in significant swellings.

Magnets may crack or crumble with uncontrolled joining to each other. You can't move them to each other. At a distance less than 10 cm you should have them very firmly.

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, or other devices. They can also destroy devices like video players, televisions, CRT computer monitors. Do not forget to keep neodymium magnets away from these electronic devices.

Neodymium magnets are highly susceptible to damage, leading to their cracking.

In the event of a collision between two neodymium magnets, it can result in them getting chipped. Despite being made of metal as well as coated with a shiny nickel plating, they are not as hard as steel. At the moment of collision between the magnets, small sharp metal pieces can be propelled in various directions at high speed. Eye protection is recommended.

Neodymium magnets should not be near 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.

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

Neodymium magnets can become demagnetized at high temperatures.

Despite the fact that magnets have been found to maintain their efficacy up to temperatures of 80°C or 175°F, it's essential to consider that this threshold may fluctuate depending on the magnet's type, configuration, and intended usage.

Exercise caution!

To raise awareness of why neodymium magnets are so dangerous, read the article titled How very dangerous are very powerful neodymium magnets?.