Product available shipping tomorrow

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

6.77 ZŁ with VAT / pcs + price for transport

5.50 ZŁ net + 23% VAT / pcs

bulk discounts:

Need more?

price from 1 pcs

5.50 ZŁ

6.76 ZŁ

price from 110 pcs

5.17 ZŁ

6.36 ZŁ

price from 455 pcs

4.84 ZŁ

5.95 ZŁ

Carbon Footprint – environmental impact GPSR Regulation – product safety

Need advice?

Contact us by phone +48 22 499 98 98 or get in touch through our online form the contact section.
Lifting power along with appearance of magnetic components can be tested using our force calculator.

Order by 14:00 and we’ll ship today!

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

Shopping tips

Produkt dostępny wysyłka jutro!

HH 25x7.7 [M5] / N38 - through hole magnetic holder

11.44 ZŁ / pcs

Produkt dostępny wysyłka jutro!

MW 15x10 / N38 - cylindrical magnet

3.14 ZŁ / pcs

Produkt dostępny wysyłka jutro!

UMC 20x6/3x7 / N38 - cylindrical magnetic holder

6.99 ZŁ / pcs

Produkt dostępny wysyłka jutro!

UMGW 75x33x18 [M10] GW / N38 - magnetic holder internal thread

189.91 ZŁ / pcs

Neodymium magnets MP 25x13x4 / N38 in a ring form are commonly used in various industries due to their unique properties. 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 high magnetic power in a relatively small area. Usage of MP 25x13x4 / N38 magnets include electric motors, generators, sound devices, and several other devices that use magnets for producing motion or storing energy. Despite their powerful strength, they have a comparatively 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. In the production process, neodymium atoms are arranged appropriately, which allows for the creation of a concentrated magnetic field in a specific direction. This field is ideal for applications in systems requiring motion control. Moreover, 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 production of electronic devices, such as speakers and 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 ideal for technologically advanced applications.

Ring magnets stand out high magnetic strength, resistance to high temperatures, and precision in generating the magnetic field. Thanks to their ring shape 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.

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

A neodymium magnet of class N50 and N52 is a strong and extremely powerful metallic component with the shape of a ring, providing high force and universal applicability. Attractive price, fast shipping, stability and broad range of uses.

Advantages and disadvantages of neodymium magnets NdFeB.

In addition to their magnetic efficiency, neodymium magnets provide the following advantages:

They do not lose their even over around ten years – the decrease of strength is only ~1% (based on measurements),
They show exceptional resistance to demagnetization from outside magnetic sources,
Because of the lustrous layer of nickel, the component looks aesthetically refined,
Magnetic induction on the surface of these magnets is very strong,
With the right combination of compounds, they reach excellent thermal stability, enabling operation at or above 230°C (depending on the form),
Thanks to the flexibility in shaping and the capability to adapt to unique requirements, neodymium magnets can be created in different geometries, which expands their usage potential,
Key role in new technology industries – they are used in hard drives, rotating machines, clinical machines along with technologically developed systems,
Compactness – despite their small size, they provide high effectiveness, making them ideal for precision applications

Disadvantages of NdFeB magnets:

They can break when subjected to a heavy 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 fracture , and at the same time increases its overall resistance,
Magnets lose field strength when exposed to temperatures exceeding 80°C. In most cases, this leads to irreversible performance loss (influenced by the magnet’s dimensions). To address this, we provide [AH] models with superior thermal resistance, able to operate even at 230°C or more,
Due to corrosion risk in humid conditions, it is recommended to use sealed magnets made of synthetic coating for outdoor use,
The use of a protective casing or external holder is recommended, since machining fine details in neodymium magnets is restricted,
Potential hazard from tiny pieces may arise, especially if swallowed, which is crucial in the health of young users. Moreover, minuscule fragments from these assemblies might interfere with diagnostics when ingested,
Due to a complex production process, their cost is considerably higher,

Exercise Caution with Neodymium Magnets

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.

The magnet is coated with nickel - be careful if you have an allergy.

Studies clearly indicate a small percentage of people who suffer from metal allergies such as 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.

Do not give neodymium magnets to children.

Neodymium magnets are not toys. You cannot allow them to become toys for children. In such a situation, surgery is necessary to remove them. In the worst case scenario, it can result in death.

Neodymium magnets can become demagnetized at high temperatures.

Despite the fact that magnets have been observed 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.

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

Strong magnetic fields emitted by neodymium magnets can destroy magnetic storage media such as floppy disks, credit cards, magnetic ID cards, cassette tapes, video tapes, or other devices. They can also damage televisions, VCRs, computer monitors, and CRT displays. Avoid placing neodymium magnets in close proximity to electronic devices.

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.

Under no circumstances should neodymium magnets be brought close to GPS and smartphones.

Strong fields generated by neodymium magnets interfere with compasses and magnetometers used in navigation, as well as internal compasses of smartphones and GPS devices.

Magnets made of neodymium are extremely fragile, leading to breaking.

Neodymium magnets are characterized by considerable fragility. Neodymium magnets are made of metal and coated with a shiny nickel surface, but they are not as hard as steel. At the moment of collision between the magnets, small metal fragments can be dispersed in different directions.

Neodymium magnets are over 10 times more powerful than ferrite magnets (the ones in speakers), and their strength can shock you.

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

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.

In the case of holding a finger in the path of a neodymium magnet, in such a case, a cut or a fracture may occur.

Exercise caution!

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