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neodymium magnets

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MPL 40x10x4 / N38 - lamellar magnet

lamellar magnet

Catalog no 020150

GTIN: 5906301811565

5

length [±0,1 mm]

40 mm

Width [±0,1 mm]

10 mm

Height [±0,1 mm]

4 mm

Weight

12 g

Magnetization Direction

↑ axial

Load capacity

6.32 kg / 61.98 N

Magnetic Induction

275.57 mT

Coating

[NiCuNi] nickel

4.87 with VAT / pcs + price for transport

3.96 ZŁ net + 23% VAT / pcs

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MPL 40x10x4 / N38 - lamellar magnet

Specification/characteristics MPL 40x10x4 / N38 - lamellar magnet
properties
values
Cat. no.
020150
GTIN
5906301811565
Production/Distribution
Dhit sp. z o.o.
Country of origin
Poland / China / Germany
Customs code
85059029
length
40 mm [±0,1 mm]
Width
10 mm [±0,1 mm]
Height
4 mm [±0,1 mm]
Weight
12 g [±0,1 mm]
Magnetization Direction
↑ axial
Load capacity ~ ?
6.32 kg / 61.98 N
Magnetic Induction ~ ?
275.57 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

Neodymium flat magnets i.e. MPL 40x10x4 / N38 are magnets created from neodymium in a flat form. They are appreciated for their extremely powerful magnetic properties, which are much stronger than standard ferrite magnets.
Due to their power, flat magnets are commonly applied in devices that require strong holding power.
Typical temperature resistance of flat magnets is 80°C, but depending on the dimensions, this value can increase.
Moreover, flat magnets usually have special coatings applied to their surfaces, e.g. nickel, gold, or chrome, for enhancing their corrosion resistance.
The magnet with the designation MPL 40x10x4 / N38 and a lifting capacity of 6.32 kg which weighs only 12 grams, making it the ideal choice for applications requiring a flat shape.
Neodymium flat magnets offer a range of advantages compared to other magnet shapes, which make them being the best choice for various uses:
Contact surface: Due to their flat shape, flat magnets guarantee a greater contact surface with other components, which is beneficial in applications requiring a stronger magnetic connection.
Technology applications: These magnets are often used in various devices, e.g. sensors, stepper motors, or speakers, where the thin and wide shape is important for their operation.
Mounting: Their flat shape makes it easier mounting, particularly when it is necessary to attach the magnet to some surface.
Design flexibility: The flat shape of the magnets permits creators greater flexibility in placing them in devices, which can be more difficult with magnets of other shapes.
Stability: In certain applications, the flat base of the flat magnet may provide better stability, reducing the risk of sliding or rotating. However, it's important to note 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, are more appropriate.
Magnets attract objects made of ferromagnetic materials, such as iron, nickel, materials with cobalt and special alloys of ferromagnetic metals. Additionally, magnets may weaker affect some other metals, such as steel. Magnets are used in many fields.
The operation of magnets is based on the properties of the magnetic field, which arises from the ordered movement of electrons in their structure. The magnetic field of these objects creates attractive forces, which affect materials containing iron or other ferromagnetic substances.

Magnets have two main poles: north (N) and south (S), which interact with each other when they are different. Similar poles, e.g. two north poles, repel each other.
Due to these properties, magnets are often used in electrical devices, such as motors, speakers, sensors, or magnetic locks. Neodymium magnets stand out with the greatest strength of attraction, making them perfect for applications requiring powerful 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 or precious stones. Furthermore, magnets do not affect most metals, such as copper, aluminum materials, gold. These metals, although they are conductors of electricity, do not exhibit ferromagnetic properties, meaning that they do not respond to a standard magnetic field, unless they are subjected to an extremely strong magnetic field.
It’s worth noting that high temperatures can weaken the magnet's effect. 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 compasses, magnetic stripe cards or electronic devices sensitive to magnetic fields. Therefore, it is important to avoid placing magnets near such devices.
A flat magnet N52 and N50 is a strong and extremely powerful magnetic piece with the shape of a plate, that offers strong holding power and versatile application. Very good price, fast shipping, durability and versatility.

Advantages and disadvantages of neodymium magnets NdFeB.

In addition to their pulling strength, neodymium magnets provide the following advantages:

  • They retain their magnetic properties for around ten years – the drop is just ~1% (according to analyses),
  • Their ability to resist magnetic interference from external fields is notable,
  • Because of the reflective layer of silver, the component looks high-end,
  • Magnetic induction on the surface of these magnets is notably high,
  • These magnets tolerate high temperatures, often exceeding 230°C, when properly designed (in relation to profile),
  • Thanks to the flexibility in shaping and the capability to adapt to individual requirements, neodymium magnets can be created in different geometries, which broadens their application range,
  • Key role in advanced technical fields – they find application in data storage devices, electromechanical systems, clinical machines and high-tech tools,
  • Compactness – despite their small size, they provide high effectiveness, making them ideal for precision applications

Disadvantages of magnetic elements:

  • They are prone to breaking when subjected to a strong impact. If the magnets are exposed to mechanical hits, it is advisable to use in a protective case. The steel housing, in the form of a holder, protects the magnet from cracks , and at the same time strengthens its overall strength,
  • Magnets lose magnetic efficiency when exposed to temperatures exceeding 80°C. In most cases, this leads to irreversible field weakening (influenced by the magnet’s profile). To address this, we provide [AH] models with superior thermal resistance, able to operate even at 230°C or more,
  • Magnets exposed to damp air can degrade. Therefore, for outdoor applications, it's best to use waterproof types made of rubber,
  • The use of a protective casing or external holder is recommended, since machining internal cuts in neodymium magnets is not feasible,
  • Potential hazard linked to microscopic shards may arise, in case of ingestion, which is important in the protection of children. It should also be noted that small elements from these magnets may hinder health screening when ingested,
  • Due to expensive raw materials, their cost is considerably higher,

Maximum magnetic pulling forcewhat contributes to it?

The given pulling force of the magnet represents the maximum force, measured in the best circumstances, specifically:

  • with the use of low-carbon steel plate serving as a magnetic yoke
  • having a thickness of no less than 10 millimeters
  • with a refined outer layer
  • in conditions of no clearance
  • in a perpendicular direction of force
  • under standard ambient temperature

Impact of factors on magnetic holding capacity in practice

In practice, the holding capacity of a magnet is conditioned by the following aspects, arranged from the most important to the least relevant:

  • Air gap between the magnet and the plate, as 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.

* Lifting capacity was assessed by applying a smooth steel plate of optimal thickness (min. 20 mm), under perpendicular pulling force, whereas under shearing force the holding force is lower. In addition, even a minimal clearance {between} the magnet and the plate decreases the load capacity.

Handle Neodymium Magnets with Caution

Neodymium magnets can become demagnetized at high temperatures.

Although magnets have demonstrated their effectiveness up to 80°C or 175°F, the temperature can vary depending on the type, shape, and intended use of the specific magnet.

Dust and powder from neodymium magnets are highly 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.

It is crucial not to allow the magnets to pinch together uncontrollably or place your fingers in their path as they attract to each other.

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

Keep neodymium magnets away from people with pacemakers.

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

Neodymium magnets are fragile as well as can easily crack and shatter.

Neodymium magnets are characterized by significant fragility. Neodymium magnets 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 bring neodymium magnets close to 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 are the most powerful magnets ever created, and their power can shock 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.

The magnet coating contains nickel, so be cautious 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.

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. You should especially avoid placing neodymium magnets near electronic devices.

 It is important to keep neodymium magnets out of reach from children.

Remember that neodymium magnets are not toys. Do not allow children to play 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.

Exercise caution!

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

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tel: +48 888 99 98 98