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MP 12x8/4x3 / N38 - ring magnet

ring magnet

Catalog no 030395

GTIN: 5906301812326

Diameter [±0,1 mm]

12 mm

internal diameter Ø [±0,1 mm]

8/4 mm

Height [±0,1 mm]

3 mm

Weight

4.24 g

Magnetization Direction

↑ axial

Load capacity

0.68 kg / 6.67 N

Magnetic Induction

237.19 mT

Coating

[NiCuNi] nickel

2.64 ZŁ with VAT / pcs + price for transport

2.15 ZŁ net + 23% VAT / pcs

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MP 12x8/4x3 / N38 - ring magnet

Specification/characteristics MP 12x8/4x3 / N38 - ring magnet

properties

values

Cat. no.

030395

GTIN

5906301812326

Production/Distribution

Dhit sp. z o.o.

Country of origin

Poland / China / Germany

Customs code

85059029

Diameter

12 mm [±0,1 mm]

internal diameter Ø

8/4 mm [±0,1 mm]

Height

3 mm [±0,1 mm]

Weight

4.24 g [±0,1 mm]

Magnetization Direction

↑ axial

Load capacity ~ ?

0.68 kg / 6.67 N

Magnetic Induction ~ ?

237.19 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 12x8/4x3 / N38 in a ring-shaped form finds extensive use in various industries. Thanks to a powerful magnetic field of 0.68 kg, which can be described as lifting capacity, they are very helpful 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 relatively low weight of 4.24 grams, which makes them more practical 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 the creation of a concentrated magnetic field in a specific direction. This field is ideal for applications in systems requiring motion control. Additionally, ring magnets are resistant to demagnetization.

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 medicine, where they are used in precision diagnostic devices. Their ability to work in high temperatures and precise magnetic field control makes them ideal for technologically advanced applications.

Ring magnets stand out extraordinary pulling power, ability to work in extreme conditions, and precision in generating 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, making them an ideal choice in the automotive, electronics, and medical industries.

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. 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 with classification N50 and N52 is a strong and extremely powerful magnetic product with the shape of a ring, that provides strong holding power and universal application. Good price, 24h delivery, ruggedness and multi-functionality.

Advantages and disadvantages of neodymium magnets NdFeB.

In addition to their immense magnetic power, neodymium magnets offer the following advantages:

They retain their magnetic properties for almost 10 years – the drop is just ~1% (in theory),
They are very resistant to demagnetization caused by external magnetic fields,
Thanks to the shiny finish and nickel coating, they have an elegant appearance,
They exhibit elevated levels of magnetic induction near the outer area of the magnet,
With the right combination of materials, they reach significant thermal stability, enabling operation at or above 230°C (depending on the design),
With the option for tailored forming and personalized design, these magnets can be produced in numerous shapes and sizes, greatly improving engineering flexibility,
Important function in cutting-edge sectors – they find application in computer drives, rotating machines, diagnostic apparatus and technologically developed systems,
Thanks to their efficiency per volume, small magnets offer high magnetic performance, while occupying minimal space,

Disadvantages of neodymium magnets:

They may fracture when subjected to a powerful impact. If the magnets are exposed to physical collisions, it is suggested to place them in a steel housing. The steel housing, in the form of a holder, protects the magnet from breakage , and at the same time enhances its overall resistance,
Magnets lose field strength when exposed to temperatures exceeding 80°C. In most cases, this leads to irreversible power drop (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,
They rust in a moist environment. If exposed to rain, we recommend using sealed magnets, such as those made of non-metallic materials,
Limited ability to create internal holes in the magnet – the use of a external casing is recommended,
Health risk from tiny pieces may arise, if ingested accidentally, which is important in the health of young users. Additionally, small elements from these devices can disrupt scanning once in the system,
In cases of tight budgets, neodymium magnet cost may be a barrier,

Caution with Neodymium Magnets

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

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

Neodymium magnets should not be in the vicinity children.

Neodymium magnets are not toys. Be cautious and make sure no child plays with them. Small magnets can pose a serious choking hazard. If multiple magnets are swallowed, they can attract to each other through the intestinal walls, causing significant injuries, and even death.

Keep neodymium magnets away from GPS and smartphones.

Neodymium magnets generate intense magnetic fields that interfere with magnetometers and compasses used in navigation, as well as internal compasses of smartphones and GPS devices.

Neodymium magnets are the strongest magnets ever created, and their strength can surprise 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.

Magnets made of neodymium are particularly delicate, resulting in damage.

Neodymium magnets are fragile as well as will shatter 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 connection between the magnets, small sharp metal pieces can be propelled in various directions at high speed. Eye protection is recommended.

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

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. Remember not to place neodymium magnets close to these electronic devices.

The magnet is coated with nickel. Therefore, exercise caution 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 are not recommended for people with pacemakers.

Neodymium magnets generate very strong magnetic fields that can 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 demagnetize at high temperatures.

In certain circumstances, Neodymium magnets can lose their magnetism when subjected to high temperatures.

Dust and powder from neodymium magnets are flammable.

Do not attempt to drill into neodymium magnets. Mechanical processing is also not recommended. Once crushed into fine powder or dust, this material becomes highly flammable.

Safety precautions!

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