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neodymium magnets

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MPL 40x15x5 / N38 - lamellar magnet

lamellar magnet

Catalog no 020153

GTIN: 5906301811596

5

length [±0,1 mm]

40 mm

Width [±0,1 mm]

15 mm

Height [±0,1 mm]

5 mm

Weight

22.5 g

Magnetization Direction

↑ axial

Load capacity

9.67 kg / 94.83 N

Magnetic Induction

249.11 mT

Coating

[NiCuNi] nickel

7.96 with VAT / pcs + price for transport

6.47 ZŁ net + 23% VAT / pcs

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MPL 40x15x5 / N38 - lamellar magnet

Specification/characteristics MPL 40x15x5 / N38 - lamellar magnet
properties
values
Cat. no.
020153
GTIN
5906301811596
Production/Distribution
Dhit sp. z o.o.
Country of origin
Poland / China / Germany
Customs code
85059029
length
40 mm [±0,1 mm]
Width
15 mm [±0,1 mm]
Height
5 mm [±0,1 mm]
Weight
22.5 g [±0,1 mm]
Magnetization Direction
↑ axial
Load capacity ~ ?
9.67 kg / 94.83 N
Magnetic Induction ~ ?
249.11 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
T
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
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

Flat neodymium magnets i.e. MPL 40x15x5 / N38 are magnets created from neodymium in a flat form. They are appreciated for their extremely powerful magnetic properties, which outshine standard ferrite magnets.
Due to their strength, flat magnets are regularly applied in structures that require very strong attraction.
Most common temperature resistance of flat magnets is 80°C, but depending on the dimensions, this value rises.
Moreover, flat magnets usually have special coatings applied to their surfaces, such as nickel, gold, or chrome, to increase their corrosion resistance.
The magnet named MPL 40x15x5 / N38 and a magnetic force 9.67 kg weighing just 22.5 grams, making it the perfect choice for applications requiring a flat shape.
Neodymium flat magnets provide a range of advantages compared to other magnet shapes, which make them being an ideal choice for various uses:
Contact surface: Due to their flat shape, flat magnets guarantee a larger contact surface with other components, which can be beneficial in applications needing a stronger magnetic connection.
Technology applications: These magnets are often used in various devices, e.g. sensors, stepper motors, or speakers, where the flat shape is important for their operation.
Mounting: The flat form's flat shape makes mounting, especially when there's a need to attach the magnet to another surface.
Design flexibility: The flat shape of the magnets permits designers a lot of flexibility in placing them in structures, which can be more difficult with magnets of more complex shapes.
Stability: In certain applications, the flat base of the flat magnet may offer better stability, reducing the risk of shifting or rotating. It’s important to keep in mind that the optimal shape of the magnet is dependent on the specific project and requirements. In some cases, other shapes, such as cylindrical or spherical, may be a better choice.
Attracted by magnets are objects made of ferromagnetic materials, such as iron, nickel, materials with cobalt or alloys of metals with magnetic properties. Additionally, magnets may weaker affect alloys containing iron, such as steel. Magnets are used in many fields.
Magnets work thanks to the properties of their magnetic field, which is generated by the movement of electric charges within their material. The magnetic field of magnets creates attractive interactions, which affect materials containing nickel or other magnetic materials.

Magnets have two poles: north (N) and south (S), which interact with each other when they are oppositely oriented. Similar poles, such as two north poles, repel each other.
Due to these properties, magnets are often used in magnetic technologies, e.g. motors, speakers, sensors, or magnetic locks. Neodymium magnets stand out with the greatest strength of attraction, making them perfect for applications requiring strong magnetic fields. Moreover, the strength of a magnet depends on its dimensions and the materials used.
Not all materials react to magnets, and examples of such substances are plastics, glass, wooden materials and precious stones. Furthermore, magnets do not affect certain metals, such as copper items, aluminum, gold. These metals, although they are conductors of electricity, do not exhibit ferromagnetic properties, meaning that they remain unaffected by a magnet, unless they are subjected to an extremely strong magnetic field.
It should be noted that extremely high temperatures, above the Curie point, cause a loss of magnetic properties in the magnet. The Curie temperature is specific to each type of magnet, meaning that under such conditions, the magnet stops being magnetic. Additionally, strong magnets can interfere with the operation of devices, such as navigational instruments, credit cards and even medical equipment, like pacemakers. For this reason, it is important to exercise caution when using magnets.
A flat magnet of class N52 and N50 is a strong and extremely powerful magnetic product designed as a plate, that provides strong holding power and versatile application. Competitive price, availability, stability and broad range of uses.

Advantages as well as disadvantages of neodymium magnets NdFeB.

Besides their high retention, neodymium magnets are valued for these benefits:

  • They have constant strength, and over nearly 10 years their attraction force decreases symbolically – ~1% (according to theory),
  • They protect against demagnetization induced by ambient electromagnetic environments remarkably well,
  • By applying a shiny layer of gold, the element gains a clean look,
  • They have exceptional magnetic induction on the surface of the magnet,
  • These magnets tolerate high temperatures, often exceeding 230°C, when properly designed (in relation to build),
  • Thanks to the possibility in shaping and the capability to adapt to specific requirements, neodymium magnets can be created in various configurations, which expands their application range,
  • Important function in cutting-edge sectors – they find application in computer drives, electromechanical systems, healthcare devices or even technologically developed systems,
  • Relatively small size with high magnetic force – neodymium magnets offer impressive pulling strength in tiny dimensions, which makes them ideal in compact constructions

Disadvantages of neodymium magnets:

  • They are fragile when subjected to a sudden impact. If the magnets are exposed to physical collisions, it is suggested to place them in a protective case. The steel housing, in the form of a holder, protects the magnet from breakage and increases its overall resistance,
  • Magnets lose power when exposed to temperatures exceeding 80°C. In most cases, this leads to irreversible performance loss (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,
  • Due to corrosion risk in humid conditions, it is wise to use sealed magnets made of rubber for outdoor use,
  • Using a cover – such as a magnetic holder – is advised due to the challenges in manufacturing complex structures directly in the magnet,
  • Possible threat due to small fragments may arise, if ingested accidentally, which is notable in the protection of children. Furthermore, tiny components from these magnets have the potential to disrupt scanning when ingested,
  • Higher purchase price is one of the drawbacks compared to ceramic magnets, especially in budget-sensitive applications

Optimal lifting capacity of a neodymium magnetwhat it depends on?

The given holding capacity of the magnet means the highest holding force, assessed in ideal conditions, specifically:

  • with mild steel, used as a magnetic flux conductor
  • with a thickness of minimum 10 mm
  • with a smooth surface
  • with zero air gap
  • under perpendicular detachment force
  • in normal thermal conditions

Key elements affecting lifting force

Practical lifting force is determined by factors, by priority:

  • Air gap between the magnet and the plate, since even a very small distance (e.g. 0.5 mm) causes 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 the plate surface of 20 mm thickness, when the force acted perpendicularly, whereas under attempts to slide the magnet the holding force is lower. Additionally, even a small distance {between} the magnet’s surface and the plate decreases the load capacity.

Precautions

Magnets will attract to each other, so remember not to allow them to pinch together without control or place your fingers in their path.

If you have a finger between or alternatively on the path of attracting magnets, there may be a severe cut or a fracture.

Magnets made of neodymium are extremely delicate, they easily fall apart as well as can crumble.

Neodymium magnets are characterized by considerable fragility. Magnets made of neodymium are made of metal and coated with a shiny nickel, but they are not as durable as steel. In the event of a collision between two magnets, there may be a scattering of fragments in different directions. Protecting your eyes is crucial in such a situation.

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

Strong magnetic fields emitted by neodymium magnets can damage magnetic storage media such as floppy disks, credit cards, magnetic ID cards, cassette tapes, video tapes, or other devices. In addition, they can damage televisions, VCRs, computer monitors, and CRT displays. You should especially avoid placing neodymium magnets near electronic devices.

People with pacemakers are advised to avoid neodymium magnets.

In the case of neodymium magnets, there is a strong magnetic field. As a result, it interferes with the operation of a heart pacemaker. Even if the magnetic field does not affect the device, it can damage its components or deactivate the entire device.

The magnet coating is made of nickel, so be cautious 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.

Neodymium magnets can demagnetize at high temperatures.

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

 Maintain neodymium magnets far from youngest children.

Not all neodymium magnets are toys, so do not let children play with them. In such a situation, surgery is necessary to remove them. In the worst case scenario, it can result in death.

Dust and powder from neodymium magnets are flammable.

Avoid drilling or mechanical processing of neodymium magnets. If the magnet is crushed into fine powder or dust, it becomes highly flammable.

Avoid bringing neodymium magnets close to a phone or GPS.

Neodymium magnets are a source of intense magnetic fields that cause interference with magnetometers and compasses used in navigation, as well as internal compasses of smartphones and GPS devices.

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

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

Be careful!

To show why neodymium magnets are so dangerous, read the article - How very dangerous are very powerful neodymium magnets?.

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