e-mail: bok@dhit.pl

neodymium magnets

We offer blue color magnetic Nd2Fe14B - our proposal. All "neodymium magnets" on our website are in stock for immediate delivery (see the list). Check out the magnet price list for more details see the magnet price list

Magnets for fishing F200 GOLD

Where to purchase very strong magnet? Magnetic holders in solid and airtight enclosure are excellent for use in challenging weather conditions, including in the rain and snow read...

magnets with holders

Holders with magnets can be used to improve production, exploring underwater areas, or searching for meteors from gold check...

We promise to ship your order on the same day before 2:00 PM on working days.

Dhit sp. z o.o. logo
Product available shipping in 3 days!

MP 25x8x5 / N38 - neodymium magnet

ring magnet

catalog number 030196

5.0

external diameter Ø

25 mm [±0,1 mm]

internal diameter Ø

8 mm [±0,1 mm]

height

5 mm [±0,1 mm]

magnetizing direction

↑ axial

capacity ~

2.28 kg / 22.36 N

magnetic induction ~

253.21 mT / 2,532 Gs

max. temperature

≤ 80 °C

3.44 PLN gross price (including VAT) / pcs +

2.80 PLN net price + 23% VAT / pcs

bulk discounts:

need more quantity?

price from 1 pcs
2.80 PLN
3.44 PLN
price from 215 pcs
2.63 PLN
3.23 PLN
price from 786 pcs
2.46 PLN
3.03 PLN

Want to bargain?

Give us a call tel: +48 22 499 98 98 or contact us through form on our website. You can check the strength and the appearance of neodymium magnet in our power calculator power calculator

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

Specification: ring magnet 25x8x5 / N38 ↑ axial

Characteristics: ring magnet 25x8x5 / N38 ↑ axial
Properties
Values
catalog number
030196
production / distribution
Dhit sp. z o.o.
country of origin
Poland / China / Germany
customs code
85059029
external diameter Ø
25 mm [±0,1 mm]
internal diameter Ø
8 mm [±0,1 mm]
height
5 mm [±0,1 mm]
magnetizing direction ?
↑ axial
capacity ~ ?
2.28 kg / 22.36 N
magnetic induction ~ ?
253.21 mT / 2,532 Gs
max. temperature ?
≤ 80 °C
coating type ?
[NiCuNi] nickel
weight
16.52 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 unique properties, neodymium element MP 25x8x5 / N38 in a ring-shaped form finds extensive use in various industries. Thanks to a powerful magnetic field of 2.28 kg, which can be described as lifting capacity, they are key in applications that require high magnetic power in a relatively small area. Usage of MP 25x8x5 / N38 magnets include electrical mechanisms, generating systems, sound devices, and numerous other devices that use magnets for producing motion or energy storage. Despite their significant strength, they have a relatively low weight of 16.52 grams, which makes them more convenient to use compared to bulkier alternatives.

Shopping tips

Advantages as well as disadvantages of neodymium magnets NdFeB.

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

  • They do not lose their strength (of the magnet). After about 10 years, their power decreases by only ~1% (theoretically),
  • They are highly resistant to demagnetization by external magnetic sources,
  • Thanks to the shiny finish and nickel, gold, or silver coating, they have an aesthetic appearance,
  • They possess very high magnetic induction on the surface of the magnet,
  • Thanks to their high temperature resistance, they can operate (depending on the shape) even at temperatures up to 230°C and above...
  • Thanks to the flexibility in shaping and the ability to adapt to specific requirements – neodymium magnets can be produced in various forms and dimensions, which amplifies their universality in usage.
  • Significant importance in the industry of new technologies – are used in computer drives, electric drive mechanisms, medical devices or other modern machines.

Disadvantages of neodymium magnets:

  • They can break as they are fragile when subjected to a strong impact. If the magnets are exposed to impacts, it is suggested using magnets in a metal holder. The steel housing in the form of a holder protects the magnet from impacts and also increases its overall strength,
  • They lose strength at high temperatures. Most neodymium magnets experience permanent loss of strength when heated above 80°C (depending on the shape and height). However, we also offer special magnets with high temperature resistance, up to 230°C,
  • 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 or a magnetic holder is recommended due to the limited possibilities of manufacturing threads or complex shapes in the magnet
  • Possible danger arising from small pieces of magnets can be dangerous, 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 can complicate diagnosis in case of swallowing.

Handle with Care: Neodymium Magnets

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

If the joining of neodymium magnets is not controlled, then they may crumble and also crack. You can't move them to each other. At a distance less than 10 cm you should hold them very strongly.

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

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

Keep neodymium magnets away from GPS and smartphones.

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

If you have a nickel allergy, avoid contact with neodymium magnets.

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

On our website, you can find information on how to use neodymium magnets. This will help you avoid injuries and prevent damage to the magnets.

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.

Neodymium magnets can become demagnetized at high temperatures.

Although magnets have demonstrated their effectiveness up to 80°C or 175°F, the temperature can vary depending on the type, shape, and intended use of the specific magnet.

Neodymium magnets are particularly fragile, resulting in shattering.

Neodymium magnets are highly delicate, and by joining them in an uncontrolled manner, they will break. Neodymium magnets are made of metal and coated with a shiny nickel surface, but they are not as hard 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.

 It is important to keep neodymium magnets out of reach from youngest children.

Remember that neodymium magnets are not toys. Be cautious and make sure no child plays 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 significant injuries, and even death.

Neodymium magnets should not be near people with pacemakers.

Neodymium magnets generate very strong magnetic fields that can interfere with the operation of a pacemaker. This is because many of these devices are equipped with a function that deactivates the device in a magnetic field.

To raise awareness of why neodymium magnets are so dangerous, read the article titled How very dangerous are very powerful neodymium magnets?.

Dhit sp. z o.o. logo

e-mail: bok@dhit.pl

tel: +48 888 99 98 98