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neodymium magnets

We offer blue color magnets Nd2Fe14B - our store's offer. Practically all magnesy neodymowe in our store are available for immediate delivery (see the list). See the magnet pricing for more details check the magnet price list

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MP 40x10.4/5.5x5 / N38 - neodymium magnet

ring magnet

catalog number 030249

GTIN: 5906301812258

5.0

external diameter Ø

40 mm [±0,1 mm]

internal diameter Ø

10.4/5.5 mm [±0,1 mm]

height

5 mm [±0,1 mm]

magnetizing direction

↑ axial

capacity ~

2.27 kg / 22.26 N

magnetic induction ~

391.66 mT / 3,917 Gs

max. temperature

≤ 80 °C

27.00 gross price (including VAT) / pcs +

21.95 ZŁ net price + 23% VAT / pcs

bulk discounts:

need more quantity?

price from 1 pcs
21.95 ZŁ
27.00 ZŁ
price from 28 pcs
20.63 ZŁ
25.37 ZŁ
price from 101 pcs
19.32 ZŁ
23.76 ZŁ

Want to talk about magnets?

Call us tel: +48 22 499 98 98 or contact us through contact form on our website. You can check the strength as well as the shape of neodymium magnets in our magnetic mass calculator power calculator

Orders placed by 2:00 PM will be shipped on the same business day.

Specification: ring magnet 40x10.4/5.5x5 / N38 ↑ axial

Characteristics: ring magnet 40x10.4/5.5x5 / N38 ↑ axial
Properties
Values
catalog number
030249
production / distribution
Dhit sp. z o.o.
country of origin
Poland / China / Germany
customs code
85059029
external diameter Ø
40 mm [±0,1 mm]
internal diameter Ø
10.4/5.5 mm [±0,1 mm]
height
5 mm [±0,1 mm]
magnetizing direction ?
↑ axial
capacity ~ ?
2.27 kg / 22.26 N
magnetic induction ~ ?
391.66 mT / 3,917 Gs
max. temperature ?
≤ 80 °C
coating type ?
[NiCuNi] nickel
weight
37.76 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
Due to specific properties, neodymium element MP 40x10.4/5.5x5 / N38 in a ring-shaped form finds extensive use in various industries. Thanks to a powerful magnetic field of 2.27 kg, which can be described as lifting capacity, they are extremely useful in applications that require strong magnetism in a relatively small area. Applications of MP 40x10.4/5.5x5 / N38 magnets include electric motors, generators, audio systems, and numerous other devices that use magnets for generating motion or storing energy. Despite their significant strength, they have a relatively low weight of 37.76 grams, which makes them more convenient to use compared to heavier alternatives.
The operation of ring magnets results from their unique atomic structure. In the production process, neodymium atoms are arranged appropriately, which allows for the creation of a concentrated magnetic field in a specific direction. This field is ideal for applications in systems requiring motion control. Additionally, their resistance to high temperatures and demagnetization makes them indispensable in industry.
They are used in various fields of technology and industry, such as production of electronic devices, such as speakers and electric motors, automotive, where they are used in brushless electric motors, and medical equipment, e.g., in scanning devices. Their ability to work in high temperatures and precise magnetic field control makes them ideal for technologically advanced applications.
Ring magnets stand out extraordinary pulling power, resistance to high temperatures, and precision in generating the magnetic field. Their unique ring form allows for application in devices requiring concentrated magnetic fields. Moreover, these magnets are significantly stronger and more versatile than ferrite counterparts, which has made them popular in advanced technologies and industrial applications.
Thanks to their resistance to high temperatures, ring magnets operate reliably even in tough conditions. Their magnetic properties remain stable, as long as the temperature does not exceed the Curie point. Compared to other types of magnets, ring magnets show greater resistance to demagnetization. Because of this, they are ideal for applications in the automotive industry, robotics, and devices requiring operation in changing or extreme environmental conditions.

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Advantages as well as disadvantages of neodymium magnets NdFeB.

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

  • They do not lose their strength (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,
  • In other words, thanks to the shiny nickel, gold, or silver finish, the element gains an visually attractive appearance,
  • They have exceptionally 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 form) even at temperatures of 230°C or higher...
  • The ability for precise shaping and customization to specific needs – neodymium magnets can be produced in many variants of shapes or sizes, which amplifies their universality in usage.
  • Significant importance in modern technologies – are utilized in computer drives, electric drive mechanisms, medical equipment or various technologically advanced devices.

Disadvantages of neodymium magnets:

  • They are fragile when subjected to a strong impact. If the magnets are exposed to impacts, we recommend using magnets in a protective case. The steel housing in the form of a holder protects the magnet from impacts and at the same time increases its overall strength,
  • Magnets lose their strength due to exposure to high temperatures. In most cases, when the temperature exceeds 80°C, these magnets experience permanent loss in strength (although it is worth noting that this is dependent on the form and size of the magnet). To avoid this problem, we offer special magnets marked with the [AH] symbol, which exhibit high temperature resistance. They can operate even at temperatures as high as 230°C or more,
  • They rust in a humid environment - during outdoor use, we recommend using waterproof magnets, such as those made of rubber or plastic,
  • 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 associated with microscopic parts of magnets can be dangerous, if swallowed, which becomes significant in the context of children's health. It's also worth noting that miniscule components of these devices have the potential to hinder the diagnostic process when they are in the body.

Handle Neodymium Magnets with Caution

You should keep neodymium magnets at a safe distance from the wallet, computer, and TV.

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 destroy videos, televisions, CRT computer monitors. Remember not to place neodymium magnets close to these electronic devices.

Neodymium magnets should not be near people with pacemakers.

Neodymium magnets produce strong magnetic fields that can interfere 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.

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

Neodymium magnets are highly fragile, and by joining them in an uncontrolled manner, they will crumble. 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.

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 strength can surprise you.

To use magnets properly, it is best to familiarize yourself with our information beforehand. This will help you avoid significant harm to your body and the magnets themselves.

 It is essential to maintain neodymium magnets away from children.

Not all neodymium magnets are toys, so do not let children play with them. In the case of small magnets, they can be swallowed and cause choking. In such cases, the only solution is to undergo surgery to remove the magnets, and otherwise, it can even lead to death.

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.

In the case of placing a finger in the path of a neodymium magnet, in that situation, a cut or even a fracture may occur.

The magnet coating is made of nickel, so be cautious if you have an allergy.

Studies clearly indicate a small percentage of people who suffer from metal allergies such as 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 can become demagnetized at high temperatures.

Even though magnets have been found to maintain their efficacy up to temperatures of 80°C or 175°F, it's essential to consider that this threshold may fluctuate depending on the magnet's type, configuration, and intended usage.

Under no circumstances should neodymium magnets be brought close to GPS and smartphones.

Magnetic fields can interfere with compasses and magnetometers used in aviation and maritime navigation, as well as internal compasses of smartphones and GPS devices. There are neodymium magnets in every smartphone, for example, in the microphone and speakers.

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

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