← previous

Product available shipping tomorrow

MP 25x8x20 / N38 - ring magnet

ring magnet

Catalog no 030450

GTIN: 5906301812340

Diameter [±0,1 mm]

25 mm

internal diameter Ø [±0,1 mm]

8 mm

Height [±0,1 mm]

20 mm

Weight

80.11 g

Magnetization Direction

↑ axial

Load capacity

8.55 kg / 83.85 N

Magnetic Induction

81.51 mT

Coating

[NiCuNi] nickel

41.71 ZŁ with VAT / pcs + price for transport

33.91 ZŁ net + 23% VAT / pcs

bulk discounts:

Need more?

price from 1 pcs

33.91 ZŁ

41.71 ZŁ

price from 18 pcs

31.88 ZŁ

39.21 ZŁ

price from 74 pcs

29.84 ZŁ

36.70 ZŁ

Carbon Footprint – environmental impact GPSR Regulation – product safety

Need help making a decision?

Pick up the phone and ask +48 22 499 98 98 or send us a note via request form the contact form page.
Force as well as structure of magnets can be analyzed with our modular calculator.

Orders submitted before 14:00 will be dispatched today!

MP 25x8x20 / N38 - ring magnet

Specification/characteristics MP 25x8x20 / N38 - ring magnet

properties

values

Cat. no.

030450

GTIN

5906301812340

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

8 mm [±0,1 mm]

Height

20 mm [±0,1 mm]

Weight

80.11 g [±0,1 mm]

Magnetization Direction

↑ axial

Load capacity ~ ?

8.55 kg / 83.85 N

Magnetic Induction ~ ?

81.51 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!

UMT 20x25 white / N38 - board holder

3.49 ZŁ / pcs

Produkt dostępny wysyłka jutro!

UMS 25x10.5x5.5x8 / N38 - conical magnetic holder

9.72 ZŁ / pcs

Produkt dostępny wysyłka jutro!

MW 7x2 / N38 - cylindrical magnet

0.38 ZŁ / pcs

Produkt dostępny wysyłka jutro!

MP 41x15x10 / N38 - ring magnet

50.00 ZŁ / pcs

Due to unique properties, neodymium element MP 25x8x20 / N38 in a ring form finds extensive use in various industries. Thanks to a powerful magnetic field of 8.55 kg, which can be described as strength, they are key in applications that require strong magnetism in a relatively small area. Applications of MP 25x8x20 / 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 80.11 grams, which makes them more convenient to use compared to heavier 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. 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, the automotive industry, e.g., in the construction of electric motors, and medicine, where they are used in precision diagnostic devices. Thanks to their temperature resistance and precision makes them indispensable in challenging industrial conditions.

Their uniqueness comes from extraordinary pulling power, resistance to high temperatures, precise control of the magnetic field. Thanks to their ring shape allows for application in devices requiring concentrated magnetic fields. Additionally, these magnets are significantly stronger and more versatile than ferrite counterparts, 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, 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 ring magnet N50 and N52 is a powerful and highly strong metal object designed as a ring, that provides high force and versatile application. Competitive price, 24h delivery, stability and universal usability.

Advantages as well as disadvantages of neodymium magnets NdFeB.

In addition to their long-term stability, neodymium magnets provide the following advantages:

Their magnetic field remains stable, and after around 10 years, it drops only by ~1% (theoretically),
Their ability to resist magnetic interference from external fields is impressive,
By applying a bright layer of nickel, the element gains a sleek look,
Magnetic induction on the surface of these magnets is very strong,
They are suitable for high-temperature applications, operating effectively at 230°C+ due to advanced heat resistance and form-specific properties,
The ability for precise shaping or adaptation to individual needs – neodymium magnets can be manufactured in multiple variants of geometries, which amplifies their functionality across industries,
Key role in new technology industries – they find application in HDDs, electromechanical systems, healthcare devices and high-tech tools,
Relatively small size with high magnetic force – neodymium magnets offer impressive pulling strength in compact dimensions, which makes them ideal in small systems

Disadvantages of magnetic elements:

They can break when subjected to a strong impact. If the magnets are exposed to external force, we recommend in a protective case. The steel housing, in the form of a holder, protects the magnet from cracks and strengthens its overall resistance,
They lose power at extreme temperatures. Most neodymium magnets experience permanent decline 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,
Due to corrosion risk in humid conditions, it is advisable to use sealed magnets made of rubber for outdoor use,
Using a cover – such as a magnetic holder – is advised due to the limitations in manufacturing fine shapes directly in the magnet,
Health risk from tiny pieces may arise, in case of ingestion, which is crucial in the family environments. It should also be noted that tiny components from these products may complicate medical imaging after being swallowed,
In cases of large-volume purchasing, neodymium magnet cost is a challenge,

Handle with Care: Neodymium Magnets

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

Neodymium magnets generate intense magnetic fields that can damage 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. Do not forget to keep neodymium magnets away from these electronic devices.

Neodymium magnets are highly delicate, they easily break and can become damaged.

Magnets made of neodymium are delicate and will break if allowed to collide with each other, even from a distance of a few centimeters. They are coated with a shiny nickel plating similar to steel, but they are not as hard. At the moment of collision between the magnets, tiny sharp metal pieces can be propelled in various directions at high speed. Eye protection is recommended.

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 happens because such devices have a function to deactivate them in a magnetic field.

Neodymium magnets can become demagnetized at high temperatures.

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

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.

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

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

Avoid contact with neodymium magnets 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.

Neodymium magnets should not be around 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.

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

Familiarize yourself with our information to correctly handle these magnets and avoid significant swellings to your body and prevent disruption to the magnets.

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

Neodymium magnets will jump and contact together within a radius of several to almost 10 cm from each other.

Exercise caution!

In order for you to know how strong neodymium magnets are and why they are so dangerous, see the article - Dangerous strong neodymium magnets.