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neodymium magnets

We provide yellow color magnetic Nd2Fe14B - our offer. Practically all "magnets" in our store are in stock for immediate delivery (check the list). See the magnet pricing for more details see the magnet price list

Magnet for fishing F300 GOLD

Where to purchase very strong neodymium magnet? Magnet holders in airtight and durable steel casing are ideally suited for use in difficult climate conditions, including during snow and rain check...

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Magnetic holders can be applied to facilitate production processes, exploring underwater areas, or finding space rocks made of metal see more...

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

ring magnet

catalog number 030249

GTIN: 5906301812258

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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 PLN gross price (including VAT) / pcs +

21.95 PLN net price + 23% VAT / pcs

bulk discounts:

need more quantity?

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

Want to talk about magnets?

Give us a call tel: +48 888 99 98 98 or get in touch via form on the contact page. You can check the power as well as the shape of neodymium magnets in our power calculator magnetic 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
45.26 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
Neodymium magnets MP 40x10.4/5.5x5 / N38 in a ring form are commonly used in various industries due to their specific properties. Thanks to a powerful magnetic field of ${capacity} kg, which can be described as lifting capacity, they are very helpful in applications that require strong magnetism in a relatively small area. Usage of MP 40x10.4/5.5x5 / N38 magnets include electrical mechanisms, generating systems, sound devices, and numerous other devices that use magnets for generating motion or energy storage. Despite their significant strength, they have a relatively low weight of ${weight} grams, which makes them more convenient to use compared to heavier alternatives.

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Advantages as well as disadvantages of neodymium magnets NdFeB.

Apart from immense strength, neodymium magnets have the following advantages:

  • They do not lose power over time - after 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 exhibit extremely high magnetic induction on the surface of the magnet,
  • By using an appropriate combination of materials, they can achieve high thermal resistance, allowing them to operate at temperatures up to 230°C and above...
  • Due to the option of accurate forming or adaptation to individual needs – neodymium magnets can be produced in a wide range of shapes and sizes, which enhances their versatility in applications.
  • Key role in advanced technologically fields – are used 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, we recommend using magnets in a protective case. The steel housing in the form of a holder protects the magnet from impacts and simultaneously increases its overall strength,
  • High temperatures can reduce the power of neodymium magnets. Typically, after heating above 80°C, most of them experience a permanent reduction in strength (although it is dependent on the form and size). To prevent this, we offer special magnets marked with the symbol [AH], which are highly resistant to high temperatures. They can operate even at temperatures up to 230°C, making them an ideal solution for applications requiring high-temperature operation,
  • They rust in a humid environment - during outdoor use, we recommend using waterproof magnets, such as those made of rubber or plastic,
  • Limited ability to create threads or complex shapes in the magnet - the use of a housing is recommended - magnetic holder
  • Possible danger arising from small pieces of magnets are risky, in case of ingestion, which is crucial in the aspect of protecting young children. It's also worth noting that small elements of these products are able to be problematic in medical diagnosis after entering the body.

Safety Guidelines with Neodymium Magnets

Dust and powder from neodymium magnets are flammable.

Do not attempt to drill into neodymium magnets. Mechanical processing is also not recommended. Once crushed into fine powder or dust, this material becomes highly flammable.

  Neodymium magnets should not be in the vicinity 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.

Comparing neodymium magnets to ferrite magnets (found in speakers), they are 10 times stronger, and their strength 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 damage to the magnets.

Avoid bringing neodymium magnets close to a phone or GPS.

Neodymium magnets generate strong magnetic fields that interfere with magnetometers and compasses used in navigation, as well as internal compasses of smartphones and GPS devices.

Neodymium magnets should not be near 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.

Neodymium magnets are noted for their fragility, which can cause them to become damaged.

Neodymium magnetic are extremely fragile, and by joining them in an uncontrolled manner, they will break. Magnets made of neodymium 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.

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

Neodymium magnets produce strong magnetic fields that can destroy magnetic media such as floppy disks, video tapes, HDDs, credit cards, magnetic ID cards, cassette tapes, etc. devices. They can also damage devices like video players, televisions, CRT computer monitors. Remember not to place neodymium magnets close to these electronic devices.

Neodymium magnets can demagnetize at high temperatures.

Under specific conditions, Neodymium magnets may experience demagnetization when subjected to high temperatures.

The magnet coating is made of nickel, so be cautious 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, try wearing gloves or avoid direct contact with nickel-plated neodymium magnets.

Neodymium Magnets can attract to each other due to their immense internal force, causing the skin and other body parts to get pinched and resulting in significant injuries.

Magnets will crack or crumble with uncontrolled joining to each other. Remember not to move them to each other or hold them firmly in hands at a distance less than 10 cm.

Please see 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