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neodymium magnets

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MW 20x18 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010040

GTIN: 5906301810391

0

Diameter Ø [±0,1 mm]

20 mm

Height [±0,1 mm]

18 mm

Weight

42.41 g

Magnetization Direction

↑ axial

Load capacity

19.91 kg / 195.25 N

Magnetic Induction

541.64 mT

Coating

[NiCuNi] nickel

23.54 with VAT / pcs + price for transport

19.14 ZŁ net + 23% VAT / pcs

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MW 20x18 / N38 - cylindrical magnet

Specification/characteristics MW 20x18 / N38 - cylindrical magnet
properties
values
Cat. no.
010040
GTIN
5906301810391
Production/Distribution
Dhit sp. z o.o.
Country of origin
Poland / China / Germany
Customs code
85059029
Diameter Ø
20 mm [±0,1 mm]
Height
18 mm [±0,1 mm]
Weight
42.41 g [±0,1 mm]
Magnetization Direction
↑ axial
Load capacity ~ ?
19.91 kg / 195.25 N
Magnetic Induction ~ ?
541.64 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 Cylindrical Magnets i.e. MW 20x18 / N38 are magnets created of neodymium in a cylindrical shape. They are valued for their extremely powerful magnetic properties, which outperform ordinary iron magnets. Because of their strength, they are frequently used in devices that require strong adhesion. The typical temperature resistance of such magnets is 80°C, but for magnets in a cylindrical form, this temperature rises with the growth of the magnet. Moreover, various special coatings, such as nickel, gold, or chrome, are frequently applied to the surface of neodymium magnets to increase their resistance to corrosion. The shape of a cylinder is as well one of the most popular among neodymium magnets. The magnet designated MW 20x18 / N38 and a magnetic strength 19.91 kg weighs only 42.41 grams.
Cylindrical neodymium magnets, often referred to as Nd2Fe14B, represent the strongest known material for magnet production. The technology of their production requires a specialized approach and includes melting special neodymium alloys along with other metals such as iron and boron. After appropriate processing, such as heat and mechanical treatment, the magnets are made available for use in varied applications, such as electric motors, audio-video equipment, and in the automotive and aerospace industries.
Moreover, even though neodymium is a component of the strongest magnets, they are susceptible to corrosion in humid environments. Therefore, they are coated with a thin layer of gold-nickel to protect them from corrosion. It's worth noting that NdFeB neodymium magnets are about 13% lighter than SmCo magnets and, despite their power, easily break, which requires special caution during their handling. For this reason, any mechanical processing should be done before they are magnetized.

In terms of safety, there are many recommendations regarding the use of these magnets. They should not be used in acidic, basic, organic environments or in solvents, and also in water or oil. Additionally, they can damage data on magnetic cards and hard drives, although data deletion using a neodymium magnet is not guaranteed.
In terms of purchasing of cylindrical neodymium magnets, many companies offer such products. One of the suggested suppliers is our company Dhit, situated in Ożarów Mazowiecki, the address can be found directly in the contact tab. It's always worth visit the website for the current information and promotions, and before visiting, we recommend calling.
Due to their power, cylindrical neodymium magnets are very useful in various applications, they can also pose certain dangers. Due to their significant magnetic power, they can pull metallic objects with significant force, which can lead to crushing skin as well as other materials, especially fingers. One should not use neodymium magnets near equipment or data storage devices, such as credit cards, as they can damage these devices in terms of magnetic recording. Furthermore, neodymium magnets are susceptible to corrosion in humid environments, thus they are coated with a thin protective layer. Generally, although they are handy, they should be handled with due caution.
Neodymium magnets, with the formula Nd2Fe14B, are presently the strong magnets on the market. They are produced through a complicated sintering process, which involves melting special alloys of neodymium with additional metals and then shaping and thermal processing. Their amazing magnetic strength comes from the exceptional production technology and chemical structure.
In terms of properties in different environments, neodymium magnets are sensitive to corrosion, especially in conditions of high humidity. Therefore, they are often covered with coatings, such as nickel, to protect them from environmental factors and extend their lifespan. Temperatures exceeding 130°C can cause a reduction of their magnetic properties, although there are particular types of neodymium magnets that can tolerate temperatures up to 230°C.
As for risks, it is important to avoid using neodymium magnets in acidic conditions, basic conditions, organic or solvent environments, unless they are properly protected. Additionally, their use is not recommended in wet conditions, oil, or in an atmosphere containing hydrogen, as they may lose their magnetic properties.
A neodymium magnet with classification N50 and N52 is a powerful and strong magnetic product designed as a cylinder, providing high force and universal applicability. Very good price, 24h delivery, ruggedness and universal usability.

Advantages and disadvantages of neodymium magnets NdFeB.

In addition to their immense field intensity, neodymium magnets offer the following advantages:

  • Their power is durable, and after approximately 10 years, it drops only by ~1% (theoretically),
  • Their ability to resist magnetic interference from external fields is among the best,
  • By applying a bright layer of nickel, the element gains a clean look,
  • The outer field strength of the magnet shows elevated magnetic properties,
  • They are suitable for high-temperature applications, operating effectively at 230°C+ due to advanced heat resistance and form-specific properties,
  • With the option for customized forming and targeted design, these magnets can be produced in various shapes and sizes, greatly improving design adaptation,
  • Important function in new technology industries – they find application in HDDs, rotating machines, healthcare devices and other advanced devices,
  • Relatively small size with high magnetic force – neodymium magnets offer strong power in small dimensions, which makes them ideal in miniature devices

Disadvantages of magnetic elements:

  • They can break when subjected to a strong impact. If the magnets are exposed to mechanical hits, it is suggested to place them in a metal holder. The steel housing, in the form of a holder, protects the magnet from cracks while also enhances its overall resistance,
  • High temperatures may significantly reduce the magnetic power of neodymium magnets. Typically, above 80°C, they experience permanent decline in performance (depending on height). 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 wet environment. If exposed to rain, we recommend using encapsulated magnets, such as those made of plastic,
  • Using a cover – such as a magnetic holder – is advised due to the restrictions in manufacturing complex structures directly in the magnet,
  • Possible threat from tiny pieces may arise, especially if swallowed, which is important in the context of child safety. Furthermore, minuscule fragments from these magnets have the potential to disrupt scanning if inside the body,
  • Higher purchase price is an important factor to consider compared to ceramic magnets, especially in budget-sensitive applications

Caution with Neodymium Magnets

Neodymium magnets can become demagnetized at high temperatures.

Under specific conditions, Neodymium magnets can lose their magnetism when subjected to high temperatures.

Neodymium magnets are primarily characterized by their significant internal force. They attract to each other, and any object that comes in their way will be affected.

Magnets attract each other within a distance of several to about 10 cm from each other. Remember not to put fingers between magnets or alternatively in their path when they attract. Depending on how massive the neodymium magnets are, they can lead to a cut or alternatively a fracture.

The magnet is coated with nickel. Therefore, exercise caution 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.

Neodymium magnets are not recommended for people with pacemakers.

Neodymium magnets generate strong magnetic fields. As a result, they interfere with the operation of a pacemaker. This happens because such devices have a function to deactivate them in a magnetic field.

Keep neodymium magnets away from GPS and smartphones.

Intense magnetic fields generated by neodymium magnets interfere with compasses and magnetometers used in navigation, as well as internal compasses of smartphones and GPS devices.

Dust and powder from neodymium magnets are highly flammable.

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

Make sure not to bring neodymium magnets close to the TV, wallet, and computer HDD.

The strong magnetic field generated by neodymium magnets can damage magnetic media such as floppy disks, video tapes, HDDs, credit cards, magnetic ID cards, cassette tapes, or other devices. They can also damage videos, televisions, CRT computer monitors. Do not forget to keep neodymium magnets at a safe distance from these electronic devices.

Neodymium magnetic are extremely fragile, resulting in breaking.

In the event of a collision between two neodymium magnets, it can result in them getting chipped. Despite being made of metal and 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.

Neodymium magnets are among the strongest magnets on Earth. The astonishing force they generate between each other can surprise 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.

 Keep neodymium magnets away from youngest children.

Remember that neodymium magnets are not toys. Do not allow children to play 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 severe injuries, and even death.

Caution!

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

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e-mail: bok@dhit.pl

tel: +48 888 99 98 98