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neodymium magnets

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MP 10x6x4 / N38 - ring magnet

ring magnet

Catalog no 030179

GTIN: 5906301811961

5

Diameter [±0,1 mm]

10 mm

internal diameter Ø [±0,1 mm]

6 mm

Height [±0,1 mm]

4 mm

Weight

3.77 g

Magnetization Direction

↑ axial

Load capacity

1.37 kg / 13.44 N

Magnetic Induction

108.09 mT

Coating

[NiCuNi] nickel

0.898 with VAT / pcs + price for transport

0.730 ZŁ net + 23% VAT / pcs

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MP 10x6x4 / N38 - ring magnet

Specification/characteristics MP 10x6x4 / N38 - ring magnet
properties
values
Cat. no.
030179
GTIN
5906301811961
Production/Distribution
Dhit sp. z o.o.
Country of origin
Poland / China / Germany
Customs code
85059029
Diameter
10 mm [±0,1 mm]
internal diameter Ø
6 mm [±0,1 mm]
Height
4 mm [±0,1 mm]
Weight
3.77 g [±0,1 mm]
Magnetization Direction
↑ axial
Load capacity ~ ?
1.37 kg / 13.44 N
Magnetic Induction ~ ?
108.09 mT
Coating
[NiCuNi] nickel
Manufacturing Tolerance
± 0.1 mm

Magnetic properties of material N38

properties
values
units
remenance Br [Min. - Max.] ?
12.2-12.6
kGs
remenance Br [Min. - Max.] ?
1220-1260
T
coercivity bHc ?
10.8-11.5
kOe
coercivity bHc ?
860-915
kA/m
actual internal force iHc
≥ 12
kOe
actual internal force iHc
≥ 955
kA/m
energy density [Min. - Max.] ?
36-38
BH max MGOe
energy density [Min. - Max.] ?
287-303
BH max KJ/m
max. temperature ?
≤ 80
°C

Physical properties of NdFeB

properties
values
units
Vickers hardness
≥550
Hv
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

Neodymium magnets MP 10x6x4 / N38 in a ring form are frequently used in various industries due to their specific properties. Thanks to a powerful magnetic field of 1.37 kg, which can be described as strength, they are key in applications that require high magnetic power in a compact space. Applications of MP 10x6x4 / N38 magnets include electric motors, generators, audio systems, and several other devices that use magnets for generating motion or storing energy. Despite their significant strength, they have a relatively low weight of 3.77 grams, which makes them more practical compared to bulkier alternatives.
Ring magnets work due to their 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 field is ideal for applications in systems requiring motion control. Additionally, ring magnets are resistant to demagnetization.
Ring magnets have a wide range of applications in many industries, such as production of electronic devices, such as speakers and electric motors, automotive, where they are used in brushless electric motors, and medical equipment, e.g., in scanning devices. Thanks to their temperature resistance and precision makes them ideal for technologically advanced applications.
Their uniqueness comes from extraordinary pulling power, resistance to high temperatures, precise control of 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, 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. 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 of class N50 and N52 is a powerful and strong metallic component designed as a ring, providing high force and broad usability. Competitive price, 24h delivery, stability and multi-functionality.

Advantages and disadvantages of neodymium magnets NdFeB.

Apart from their notable magnetic energy, neodymium magnets have these key benefits:

  • They have constant strength, and over nearly ten years their performance decreases symbolically – ~1% (according to theory),
  • Their ability to resist magnetic interference from external fields is impressive,
  • 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,
  • Neodymium magnets are known for strong magnetic induction and the ability to work at temperatures up to 230°C or higher (depending on the geometry),
  • With the option for fine forming and personalized design, these magnets can be produced in multiple shapes and sizes, greatly improving application potential,
  • Important function in advanced technical fields – they are utilized in HDDs, rotating machines, diagnostic apparatus and sophisticated instruments,
  • Compactness – despite their small size, they generate strong force, making them ideal for precision applications

Disadvantages of neodymium magnets:

  • They are fragile when subjected to a sudden impact. If the magnets are exposed to external force, we recommend in a protective enclosure. The steel housing, in the form of a holder, protects the magnet from fracture and additionally enhances its overall strength,
  • Magnets lose pulling force 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,
  • Due to corrosion risk in humid conditions, it is recommended to use sealed magnets made of plastic for outdoor use,
  • Using a cover – such as a magnetic holder – is advised due to the challenges in manufacturing fine shapes directly in the magnet,
  • Potential hazard linked to microscopic shards may arise, if ingested accidentally, which is important in the context of child safety. Additionally, tiny components from these devices can hinder health screening if inside the body,
  • High unit cost – neodymium magnets are costlier than other types of magnets (e.g., ferrite), which can restrict large-scale applications

Highest magnetic holding forcewhat affects it?

The given pulling force of the magnet represents the maximum force, determined under optimal conditions, namely:

  • with mild steel, serving as a magnetic flux conductor
  • with a thickness of minimum 10 mm
  • with a refined outer layer
  • with no separation
  • in a perpendicular direction of force
  • at room temperature

Practical lifting capacity: influencing factors

In practice, the holding capacity of a magnet is conditioned by these factors, from crucial to less important:

  • Air gap between the magnet and the plate, because even a very small distance (e.g. 0.5 mm) can cause a drop in lifting force of up to 50%.
  • Direction of applied force, because the maximum lifting capacity is achieved under perpendicular application. The force required to slide the magnet along the plate is usually several times lower.
  • Thickness of the plate, as a plate that is too thin causes part of the magnetic flux not to be used and to remain wasted in the air.
  • Material of the plate, because higher carbon content lowers holding force, while higher iron content increases it. The best choice is steel with high magnetic permeability and high saturation induction.
  • Surface of the plate, because the more smooth and polished it is, the better the contact and consequently the greater the magnetic saturation.
  • Operating temperature, since all permanent magnets have a negative temperature coefficient. This means that at high temperatures they are weaker, while at sub-zero temperatures they become slightly stronger.

* Holding force was checked on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, in contrast under shearing force the lifting capacity is smaller. In addition, even a small distance {between} the magnet’s surface and the plate reduces the lifting capacity.

Safety Precautions

Neodymium magnets can demagnetize 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.

Keep neodymium magnets as far away as possible from GPS and smartphones.

Magnetic fields interfere with compasses and magnetometers used in navigation for air and sea transport, as well as internal compasses of smartphones and GPS devices.

  Neodymium magnets should not be around youngest children.

Neodymium magnets are not toys. You cannot allow them to become toys for children. In the case of small magnets, they can be swallowed and cause choking. In such cases, the only solution is to undergo surgery to remove the magnets, and otherwise, it can even lead to death.

Neodymium magnets are the most powerful magnets ever invented. Their power can surprise you.

On our website, you can find information on how to use neodymium magnets. This will help you avoid injuries and prevent damage to the 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 happens because such devices have a function to deactivate them in a magnetic field.

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

Strong 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.

Magnets made of neodymium are noted for being fragile, which can cause them to become damaged.

In the event of a collision between two neodymium magnets, it can result in them getting chipped. 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.

If you have a nickel allergy, avoid contact with neodymium magnets.

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.

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.

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 injuries.

Neodymium magnets will bounce and clash together within a distance of several to almost 10 cm from each other.

Exercise caution!

In order to show why neodymium magnets are so dangerous, see the article - How very dangerous are strong neodymium magnets?.

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tel: +48 888 99 98 98