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neodymium magnets

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MPL 40x40x15 / N38 - neodymium magnet

lamellar magnet

catalog number 020161

GTIN: 5906301811671

5.0

length

40 mm [±0,1 mm]

width

40 mm [±0,1 mm]

height

15 mm [±0,1 mm]

magnetizing direction

↑ axial

capacity ~

47.38 kg / 464.64 N

magnetic induction ~

345.80 mT / 3,458 Gs

max. temperature

≤ 80 °C

65.01 gross price (including VAT) / pcs +

52.85 ZŁ net price + 23% VAT / pcs

bulk discounts:

need more quantity?

price from 1 pcs
52.85 ZŁ
65.01 ZŁ
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Call us tel: +48 22 499 98 98 or get in touch via form on our website. You can check the strength and the shape of neodymium magnets in our magnetic calculator force calculator

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Specification: lamellar magnet 40x40x15 / N38 ↑ axial

Characteristics: lamellar magnet 40x40x15 / N38 ↑ axial
Properties
Values
catalog number
020161
production / distribution
Dhit sp. z o.o.
country of origin
Poland / China / Germany
customs code
85059029
length
40 mm [±0,1 mm]
width
40 mm [±0,1 mm]
height
15 mm [±0,1 mm]
magnetizing direction ?
↑ axial
capacity ~ ?
47.38 kg / 464.64 N
magnetic induction ~ ?
345.80 mT / 3,458 Gs
max. temperature ?
≤ 80 °C
coating type ?
[NiCuNi] nickel
weight
180.00 g
execution tolerance
± 0.1 mm

Magnetic properties of the material N38

material characteristics 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 sintered neodymium magnets Nd2Fe14B

Physical properties of sintered neodymium magnets Nd2Fe14B
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
Flat neodymium magnets i.e. MPL 40x40x15 / N38 are magnets made from neodymium in a rectangular form. They are appreciated for their very strong magnetic properties, which are much stronger than standard ferrite magnets.
Thanks to their high strength, flat magnets are frequently applied in products that require strong holding power.
Typical temperature resistance of flat magnets is 80 °C, but depending on the dimensions, this value rises.
Additionally, flat magnets usually have special coatings applied to their surfaces, such as nickel, gold, or chrome, to improve their corrosion resistance.
The magnet named MPL 40x40x15 / N38 and a magnetic strength 47.38 kg which weighs a mere 180.00 grams, making it the excellent choice for applications requiring a flat shape.
Neodymium flat magnets offer a range of advantages compared to other magnet shapes, which make them being an ideal choice for many applications:
Contact surface: Thanks to their flat shape, flat magnets guarantee a greater contact surface with adjacent parts, which can be beneficial in applications requiring a stronger magnetic connection.
Technology applications: They are often applied in different devices, e.g. sensors, stepper motors, or speakers, where the flat shape is necessary for their operation.
Mounting: Their flat shape simplifies mounting, especially when there's a need to attach the magnet to another surface.
Design flexibility: The flat shape of the magnets gives the possibility designers greater flexibility in arranging them in devices, which is more difficult with magnets of more complex shapes.
Stability: In some applications, the flat base of the flat magnet may provide 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 application and requirements. In certain cases, other shapes, like cylindrical or spherical, may be a better choice.
Attracted by magnets are objects made of ferromagnetic materials, such as iron, nickel, cobalt or alloys of metals with magnetic properties. Additionally, magnets may lesser affect alloys containing iron, such as steel. It’s worth noting that magnets are utilized in various devices and technologies.
The operation of magnets is based on 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 attract materials containing iron or other ferromagnetic substances.

Magnets have two poles: north (N) and south (S), which attract each other when they are different. Similar poles, e.g. two north poles, repel each other.
Due to these properties, magnets are commonly used in magnetic technologies, e.g. motors, speakers, sensors, or magnetic locks. Neodymium magnets stand out with the highest power of attraction, making them perfect for applications requiring powerful magnetic fields. Moreover, the strength of a magnet depends on its dimensions and the material it is made of.
Not all materials react to magnets, and examples of such substances are plastic, glass, wooden materials and most gemstones. Additionally, magnets do not affect most metals, such as copper, aluminum, copper, aluminum, and gold. Although these metals conduct electricity, do not exhibit ferromagnetic properties, meaning that they remain unaffected by a magnet, unless exposed to a very strong magnetic field.
It should be noted 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 navigational instruments, credit cards and even medical equipment, like pacemakers. For this reason, it is important to exercise caution when using magnets.

Recommended articles for purchase

Advantages as well as disadvantages of neodymium magnets NdFeB.

In addition to immense power, neodymium magnets have the following advantages:

  • They do not lose their power (of the magnet). After approximately 10 years, their power decreases by only ~1% (theoretically),
  • They are exceptionally resistant to demagnetization caused by an external magnetic field,
  • Thanks to the shiny finish and nickel, gold, or silver coating, they have an aesthetic appearance,
  • They have very high magnetic induction on the surface of the magnet,
  • Magnetic neodymium magnets are characterized by hugely high magnetic induction on the surface of the magnet and can operate (depending on the shape) even at temperatures of 230°C or higher...
  • Thanks to the flexibility in shaping and the ability to adapt to specific requirements – neodymium magnets can be produced in many variants of shapes and sizes, which enhances their versatility in applications.
  • Significant importance in the industry of new technologies – find application in hard drives, electric motors, medical apparatus or other advanced devices.

Disadvantages of neodymium magnets:

  • They can break as they are extremely fragile when subjected to a strong impact. If the magnets are exposed to impacts, it is suggested using magnets in a metal holder. The steel housing in the form of a holder protects the magnet from impacts and simultaneously increases its overall strength,
  • They lose strength at high temperatures. Most neodymium magnets experience permanent loss of strength when heated above 80°C (depending on the form and height). However, we also offer special magnets with high temperature resistance, up to 230°C,
  • Magnets exposed to a humid environment can corrode. Therefore, when using them outdoors, we suggest using waterproof magnets made of rubber, plastic, or other moisture-resistant materials,
  • The use of a cover - a magnetic holder is recommended due to the limited production capabilities of creating threads or complex shapes in the magnet
  • Possible danger to health from tiny fragments of magnets are risky, in case of ingestion, which is particularly important in the context of children's health. It's also worth noting that tiny parts of these magnets have the potential to be problematic in medical diagnosis after entering the body.

Safety Precautions

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

Magnets attract each other within a distance of several to about 10 cm from each other. Don't put your fingers in the path of magnet attraction, as a significant injury may occur. Magnets, depending on their size, are able even cut off a finger or alternatively there can be a significant pressure or a fracture.

Neodymium magnets are not recommended for 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.

Although magnets are generally resilient, their ability to retain their magnetic strength can be influenced by factors like the type of material used, the magnet's shape, and the intended purpose for which it is employed.

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

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.

Dust and powder from neodymium magnets are flammable.

Do not attempt to drill into neodymium magnets. Mechanical processing is also not recommended. If the magnet is crushed into fine powder or dust, it becomes highly flammable.

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

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

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. They can also damage televisions, VCRs, computer monitors, and CRT displays. You should especially avoid placing neodymium magnets near electronic devices.

The magnet is coated with nickel - be careful 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, you can try wearing gloves or simply avoid direct contact with nickel-plated neodymium magnets.

Magnets made of neodymium are known for their fragility, which can cause them to shatter.

In the event of a collision between two neodymium magnets, it can result in them getting chipped. Despite being made of metal as well as coated with a shiny nickel plating, they are not as hard as steel. At the moment of connection between the magnets, small sharp metal fragments can be propelled in various directions at high speed. Eye protection is recommended.

  Magnets are not toys, children should not play with them.

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 severe injuries, and even death.

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

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e-mail: bok@dhit.pl

tel: +48 888 99 98 98