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neodymium magnets

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MPL 45x25x10 / N38 - lamellar magnet

lamellar magnet

Catalog no 020164

GTIN: 5906301811701

5

length [±0,1 mm]

45 mm

Width [±0,1 mm]

25 mm

Height [±0,1 mm]

10 mm

Weight

84.38 g

Magnetization Direction

↑ axial

Load capacity

26.49 kg / 259.78 N

Magnetic Induction

306.29 mT

Coating

[NiCuNi] nickel

35.01 with VAT / pcs + price for transport

28.46 ZŁ net + 23% VAT / pcs

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MPL 45x25x10 / N38 - lamellar magnet

Specification/characteristics MPL 45x25x10 / N38 - lamellar magnet
properties
values
Cat. no.
020164
GTIN
5906301811701
Production/Distribution
Dhit sp. z o.o.
Country of origin
Poland / China / Germany
Customs code
85059029
length
45 mm [±0,1 mm]
Width
25 mm [±0,1 mm]
Height
10 mm [±0,1 mm]
Weight
84.38 g [±0,1 mm]
Magnetization Direction
↑ axial
Load capacity ~ ?
26.49 kg / 259.78 N
Magnetic Induction ~ ?
306.29 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

Flat neodymium magnets min. MPL 45x25x10 / N38 are magnets created from neodymium in a flat form. They are appreciated for their exceptionally potent magnetic properties, which outshine ordinary ferrite magnets.
Thanks to their mighty power, flat magnets are commonly used in devices that require very strong attraction.
Most common temperature resistance of these magnets is 80°C, but with larger dimensions, this value grows.
Moreover, flat magnets usually have special coatings applied to their surfaces, e.g. nickel, gold, or chrome, to increase their corrosion resistance.
The magnet with the designation MPL 45x25x10 / N38 and a magnetic strength 26.49 kg weighing a mere 84.38 grams, making it the ideal choice for projects needing a flat magnet.
Neodymium flat magnets offer a range of advantages compared to other magnet shapes, which lead to 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 can be beneficial in applications needing a stronger magnetic connection.
Technology applications: They are often applied in many devices, such as sensors, stepper motors, or speakers, where the thin and wide shape is important for their operation.
Mounting: This form's flat shape simplifies mounting, particularly when it is required 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 other shapes.
Stability: In some applications, the flat base of the flat magnet may offer better stability, minimizing the risk of sliding or rotating. However, one should remember that the optimal shape of the magnet is dependent on the specific application and requirements. In certain cases, other shapes, like cylindrical or spherical, are more appropriate.
Magnets attract objects made of ferromagnetic materials, such as iron elements, objects containing nickel, cobalt and special alloys of ferromagnetic metals. Additionally, magnets may lesser affect some other metals, such as steel. It’s worth noting that magnets are utilized in various devices and technologies.
Magnets work thanks to the properties of their magnetic field, which arises from the ordered movement of electrons in their structure. Magnetic fields of these objects creates attractive interactions, which affect materials containing nickel or other magnetic materials.

Magnets have two main poles: north (N) and south (S), which interact with each other when they are different. Poles of the same kind, such as two north poles, repel each other.
Thanks to this principle of operation, magnets are often used in magnetic technologies, such as motors, speakers, sensors, or magnetic locks. Neodymium magnets stand out with the highest power of attraction, making them ideal for applications requiring powerful magnetic fields. Additionally, 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 most gemstones. Moreover, magnets do not affect most metals, such as copper, aluminum, gold. Although these metals conduct 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 should be noted that high temperatures can weaken the magnet's effect. Every magnetic material has its Curie point, meaning that once this temperature is exceeded, 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. Therefore, it is important to avoid placing magnets near such devices.
A flat magnet N50 and N52 is a strong and powerful metallic component designed as a plate, that offers strong holding power and universal application. Attractive price, 24h delivery, ruggedness and versatility.

Advantages and disadvantages of neodymium magnets NdFeB.

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

  • They do not lose their power approximately ten years – the loss of power is only ~1% (based on measurements),
  • They are highly resistant to demagnetization caused by external magnetic fields,
  • Because of the lustrous layer of gold, the component looks visually appealing,
  • They have exceptional magnetic induction on the surface of the magnet,
  • These magnets tolerate extreme temperatures, often exceeding 230°C, when properly designed (in relation to profile),
  • The ability for precise shaping as well as adjustment to individual needs – neodymium magnets can be manufactured in a wide range of shapes and sizes, which amplifies their functionality across industries,
  • Important function in modern technologies – they are utilized in hard drives, rotating machines, medical equipment along with technologically developed systems,
  • Thanks to their concentrated strength, small magnets offer high magnetic performance, while occupying minimal space,

Disadvantages of magnetic elements:

  • They can break when subjected to a powerful impact. If the magnets are exposed to external force, we recommend in a metal holder. The steel housing, in the form of a holder, protects the magnet from breakage , and at the same time increases its overall resistance,
  • Magnets lose magnetic efficiency when exposed to temperatures exceeding 80°C. In most cases, this leads to irreversible power drop (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,
  • Due to corrosion risk in humid conditions, it is recommended to use sealed magnets made of rubber for outdoor use,
  • Limited ability to create threads in the magnet – the use of a external casing is recommended,
  • Possible threat due to small fragments may arise, when consumed by mistake, which is notable in the context of child safety. Moreover, small elements from these devices have the potential to complicate medical imaging after being swallowed,
  • High unit cost – neodymium magnets are more expensive than other types of magnets (e.g., ferrite), which may limit large-scale applications

Magnetic strength at its maximum – what it depends on?

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

  • with the use of low-carbon steel plate acting as a magnetic yoke
  • with a thickness of minimum 10 mm
  • with a polished side
  • with no separation
  • under perpendicular detachment force
  • in normal thermal conditions

Lifting capacity in practice – influencing factors

The lifting capacity of a magnet depends on in practice the following factors, from primary to secondary:

  • Air gap between the magnet and the plate, because 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 testing was conducted on a smooth plate of suitable thickness, under perpendicular forces, whereas under attempts to slide the magnet the lifting capacity is smaller. Additionally, even a minimal clearance {between} the magnet and the plate reduces the lifting capacity.

Exercise Caution with Neodymium Magnets

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

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

Comparing neodymium magnets to ferrite magnets (found in speakers), they are 10 times more powerful, and their strength 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 can attract to each other, pinch the skin, and cause significant injuries.

Magnets will jump and clash together within a radius of several to around 10 cm from each other.

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.

Never bring neodymium magnets close to a phone and GPS.

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

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

Neodymium magnetic are extremely delicate, and by joining them in an uncontrolled manner, they will crack. Neodymium magnets are made of metal and coated with a shiny nickel surface, but they are not as hard as steel. At the moment of connection between the magnets, small metal fragments can be dispersed in different directions.

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 give neodymium magnets to youngest children.

Remember that neodymium magnets are not toys. Be cautious and make sure no child plays with them. They can be a significant 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 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 can become demagnetized at high temperatures.

Whilst Neodymium magnets can lose their magnetic properties at high temperatures, it's important to note that the extent of this effect can vary based on factors such as the magnet's material, shape, and intended application.

Safety rules!

Please see the article - What danger lies in neodymium magnets? You will learn how to handle them properly.

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tel: +48 888 99 98 98