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neodymium magnets

We provide red color magnetic Nd2Fe14B - our proposal. All magnesy neodymowe in our store are in stock for immediate delivery (see the list). Check out the magnet pricing for more details check the magnet price list

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MW 20x5 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010044

GTIN: 5906301810438

5

Diameter Ø [±0,1 mm]

20 mm

Height [±0,1 mm]

5 mm

Weight

11.78 g

Magnetization Direction

↑ axial

Load capacity

5.53 kg / 54.23 N

Magnetic Induction

277.16 mT

Coating

[NiCuNi] nickel

5.56 with VAT / pcs + price for transport

4.52 ZŁ net + 23% VAT / pcs

bulk discounts:

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Call us now +48 22 499 98 98 alternatively drop us a message via request form our website.
Force along with shape of a neodymium magnet can be tested with our magnetic mass calculator.

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MW 20x5 / N38 - cylindrical magnet

Specification/characteristics MW 20x5 / N38 - cylindrical magnet
properties
values
Cat. no.
010044
GTIN
5906301810438
Production/Distribution
Dhit sp. z o.o.
Country of origin
Poland / China / Germany
Customs code
85059029
Diameter Ø
20 mm [±0,1 mm]
Height
5 mm [±0,1 mm]
Weight
11.78 g [±0,1 mm]
Magnetization Direction
↑ axial
Load capacity ~ ?
5.53 kg / 54.23 N
Magnetic Induction ~ ?
277.16 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

Our cylinder magnets are made of the strongest magnetic material in the world. As a result, they offer huge pull force while maintaining a small size. Model MW 20x5 / N38 has a pull force of approx. 5.53 kg. The cylindrical form makes them perfect for mounting in drilled holes, generators and magnetic separators. The surface is protected by a Ni-Cu-Ni (Nickel-Copper-Nickel) coating.
The best and safest method is gluing into a hole with a slightly larger diameter (e.g. +0.1 mm clearance). Professional industrial adhesives are best, which are safe for the anti-corrosion layer. Do not hit the magnets, as neodymium is a brittle material and is prone to chipping upon impact.
The grade symbol (e.g. N38, N52) defines the magnetic energy density of the material. Larger numbers indicate a stronger magnetic field for the same size. The universal option is N38, which provides an optimal price-to-power ratio. For projects requiring extreme strength, we recommend grade N52, which is the strongest commercially available sinter.
We use a protective plating of Ni-Cu-Ni (Nickel-Copper-Nickel), which protects against air humidity. Please note they are not water-resistant. With constant contact with water or rain, the coating may be damaged, leading to rusting of the magnet. For such tasks, we suggest enclosing them in a sealed housing or ordering a special version.
Their wide application covers advanced technologies. They are used in generators and wind turbines and in magnetic separators for cleaning bulk products. Additionally, due to their precise dimensions, they are ideal for measuring systems and sensors.
These magnets retain their properties up to 80 degrees Celsius. Exceeding this limit risks permanent loss of power. For work in hot environments (e.g. 120°C, 150°C, 200°C), we offer H, SH, or UH series on request. Please note that magnets are sensitive to rapid temperature changes.

Advantages as well as disadvantages of neodymium magnets NdFeB.

In addition to their magnetic efficiency, neodymium magnets provide the following advantages:

  • They retain their attractive force for around 10 years – the loss is just ~1% (based on simulations),
  • Their ability to resist magnetic interference from external fields is impressive,
  • The use of a decorative gold surface provides a eye-catching finish,
  • They exhibit superior levels of magnetic induction near the outer area of the magnet,
  • With the right combination of materials, they reach increased thermal stability, enabling operation at or above 230°C (depending on the design),
  • Thanks to the possibility in shaping and the capability to adapt to specific requirements, neodymium magnets can be created in various configurations, which increases their application range,
  • Significant impact in cutting-edge sectors – they serve a purpose in computer drives, electromechanical systems, medical equipment as well as technologically developed systems,
  • Relatively small size with high magnetic force – neodymium magnets offer impressive pulling strength in compact dimensions, which makes them ideal in miniature devices

Disadvantages of magnetic elements:

  • They are fragile when subjected to a strong impact. If the magnets are exposed to mechanical hits, they should be placed in a steel housing. The steel housing, in the form of a holder, protects the magnet from cracks and additionally increases its overall robustness,
  • High temperatures may significantly reduce the holding force of neodymium magnets. Typically, above 80°C, they experience permanent deterioration in performance (depending on form). To prevent this, we offer heat-resistant magnets marked [AH], capable of working up to 230°C, which makes them perfect for high-temperature use,
  • They rust in a damp environment, especially when used outside, we recommend using moisture-resistant magnets, such as those made of rubber,
  • Using a cover – such as a magnetic holder – is advised due to the restrictions in manufacturing holes directly in the magnet,
  • Possible threat from tiny pieces may arise, in case of ingestion, which is crucial in the family environments. Moreover, small elements from these magnets may hinder health screening after being swallowed,
  • In cases of tight budgets, neodymium magnet cost may be a barrier,

Breakaway strength of the magnet in ideal conditionswhat affects it?

The given lifting capacity of the magnet represents the maximum lifting force, measured in ideal conditions, that is:

  • with mild steel, used as a magnetic flux conductor
  • of a thickness of at least 10 mm
  • with a smooth surface
  • with no separation
  • with vertical force applied
  • at room temperature

Lifting capacity in practice – influencing factors

Practical lifting force is determined by factors, by priority:

  • Air gap between the magnet and the plate, as 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 tested on the plate surface of 20 mm thickness, when a perpendicular force was applied, whereas under parallel forces the lifting capacity is smaller. Moreover, even a small distance {between} the magnet’s surface and the plate reduces the load capacity.

Be Cautious with Neodymium Magnets

 It is important to maintain neodymium magnets away from youngest children.

Neodymium magnets are not toys. Be cautious and make sure no child plays with them. In the case of swallowing multiple magnets simultaneously, they can attract to each other through the intestinal walls. In the worst case scenario, this can lead to death.

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.

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

Magnetic 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.

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, try wearing gloves or avoid direct contact with nickel-plated neodymium magnets.

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

Magnets will 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, because a serious injury may occur. Magnets, depending on their size, can even cut off a finger or there can be a serious pressure or even a fracture.

Neodymium magnets are over 10 times stronger than ferrite magnets (the ones in speakers), and their power can shock you.

Familiarize yourself with our information to properly handle these magnets and avoid significant swellings to your body and prevent disruption to the magnets.

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.

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

Neodymium magnetic are fragile as well as will shatter if allowed to collide with each other, even from a distance of a few centimeters. 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 fragments can be propelled in various directions at high speed. Eye protection is recommended.

Dust and powder from neodymium magnets are flammable.

Avoid drilling or mechanical processing of neodymium magnets. Once crushed into fine powder or dust, this material becomes highly flammable.

Neodymium magnets can demagnetize at high temperatures.

While Neodymium magnets can demagnetize 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.

Pay attention!

So that know how powerful neodymium magnets are and why they are so dangerous, read the article - Dangerous very strong neodymium magnets.

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e-mail: bok@dhit.pl

tel: +48 888 99 98 98