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neodymium magnets

We provide blue color magnets Nd2Fe14B - our proposal. All magnesy neodymowe on our website are in stock for immediate purchase (see the list). See the magnet pricing for more details see the magnet price list

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MP 20x5x27 / N38 - neodymium magnet

ring magnet

catalog number 030185

GTIN: 5906301812029

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external diameter Ø

20 mm [±0,1 mm]

internal diameter Ø

5 mm [±0,1 mm]

height

27 mm [±0,1 mm]

magnetizing direction

↑ axial

capacity ~

7.70 kg / 75.51 N

magnetic induction ~

34.79 mT / 348 Gs

max. temperature

≤ 80 °C

33.00 PLN gross price (including VAT) / pcs +

26.83 PLN net price + 23% VAT / pcs

bulk discounts:

need more quantity?

price from 1 pcs
26.83 PLN
33.00 PLN
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25.22 PLN
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23.61 PLN
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Call us tel: +48 888 99 98 98 or get in touch through form on our website. You can check the power and the shape of neodymium magnets in our magnetic mass calculator magnetic mass calculator

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Specification: ring magnet 20x5x27 / N38 ↑ axial

Characteristics: ring magnet 20x5x27 / N38 ↑ axial
Properties
Values
catalog number
030185
production / distribution
Dhit sp. z o.o.
country of origin
Poland / China / Germany
customs code
85059029
external diameter Ø
20 mm [±0,1 mm]
internal diameter Ø
5 mm [±0,1 mm]
height
27 mm [±0,1 mm]
magnetizing direction ?
↑ axial
capacity ~ ?
7.70 kg / 75.51 N
magnetic induction ~ ?
34.79 mT / 348 Gs
max. temperature ?
≤ 80 °C
coating type ?
[NiCuNi] nickel
weight
59.64 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 20x5x27 / N38 in a ring-shaped form finds extensive use in various industries. Thanks to a powerful magnetic field of 7.70 kg, which can be described as strength, they are extremely useful in applications that require high magnetic power in a compact space. Applications of MP 20x5x27 / N38 magnets include electric motors, generators, sound devices, and numerous other devices that use magnets for generating motion or storing energy. Despite their significant strength, they have a relatively low weight of 59.64 grams, which makes them more convenient to use compared to bulkier alternatives.

Compilation of suggested goods

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 strength decreases by only ~1% (theoretically),
  • They are highly resistant to demagnetization by external magnetic field,
  • By applying a shiny coating of nickel, gold, or silver, the element gains an aesthetic appearance,
  • They possess very high magnetic induction on the surface of the magnet,
  • Magnetic neodymium magnets are characterized by very high magnetic induction on the surface of the magnet and can operate (depending on the form) even at temperatures of 230°C or higher...
  • Due to the option of accurate forming or adaptation to individual needs – neodymium magnets can be produced in various forms and dimensions, which amplifies their universality in usage.
  • Significant importance in modern technologies – are utilized in computer drives, electric motors, medical devices and other modern machines.

Disadvantages of neodymium magnets:

  • They are prone to breaking as they are fragile when subjected to a strong impact. If the magnets are exposed to impacts, it is suggested using magnets in a steel housing. The steel housing in the form of a holder protects the magnet from impacts and also 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,
  • Magnets exposed to a humid environment can corrode. Therefore, when using them outdoors, we recommend using waterproof magnets made of rubber, plastic, or other moisture-resistant materials,
  • Limited ability to create threads or complex shapes in the magnet - the use of a housing is recommended - magnetic holder
  • Potential hazard to health from tiny fragments of magnets are risky, in case of ingestion, which is crucial in the aspect of protecting young children. Furthermore, small elements of these devices are able to hinder the diagnostic process after entering the body.

Precautions

Neodymium magnets can become demagnetized at high temperatures.

Despite the fact that magnets have been observed 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.

Keep neodymium magnets away from 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.

Dust and powder from neodymium magnets are highly 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.

Under no circumstances should neodymium magnets be placed 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. You should especially avoid placing neodymium magnets near electronic devices.

Keep neodymium magnets away from 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.

The magnet is coated with nickel. Therefore, exercise caution 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, try wearing gloves or avoid direct contact with nickel-plated neodymium magnets.

Neodymium magnets are the most powerful magnets ever invented. Their strength can surprise you.

Please review the information on how to handle neodymium magnets and avoid significant harm to your body, as well as prevent unintentional disruption to the magnets.

Magnets made of neodymium are highly susceptible to damage, leading to shattering.

Neodymium magnetic are extremely fragile, and by joining them in an uncontrolled manner, they will crumble. 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, sharp metal fragments can be dispersed in different directions.

It is crucial not to allow the magnets to pinch together uncontrollably or place your fingers in their path as they attract to each other.

Magnets attract each other within a distance of several to around 10 cm from each other. Remember not to insert fingers between magnets or in their path when they attract. Magnets, depending on their size, can even cut off a finger or there can be a severe pressure or a fracture.

 Keep neodymium magnets away from youngest children.

Neodymium magnets are not toys. You cannot allow them to become toys for children. In such a situation, surgery is necessary to remove them. In the worst case scenario, it can result in death.

Please read 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