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neodymium magnets

We provide yellow color magnets Nd2Fe14B - our offer. All magnesy neodymowe in our store are in stock for immediate purchase (see the list). See the magnet price list for more details check the magnet price list

Magnet for water searching F400 GOLD

Where to purchase powerful neodymium magnet? Holders with magnets in airtight, solid steel casing are excellent for use in difficult weather, including during snow and rain check

magnetic holders

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MW 20x5 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010044

GTIN: 5906301810438

5

Diameter Ø

20 mm [±0,1 mm]

Height

5 mm [±0,1 mm]

Weight

11.78 g

Magnetization Direction

↑ axial

Load capacity

5.53 kg / 54.23 N

Magnetic Induction

277.16 mT

Coating

[NiCuNi] nickel

5.56 with VAT / pcs + price for transport

4.52 ZŁ net + 23% VAT / pcs

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MW 20x5 / N38 - cylindrical magnet
Specification/characteristics MW 20x5 / N38 - cylindrical magnet
properties
values
Cat. no.
010044
GTIN
5906301810438
Production/Distribution
Dhit sp. z o.o.
Country of origin
Poland / China / Germany
Customs code
85059029
Diameter Ø
20 mm [±0,1 mm]
Height
5 mm [±0,1 mm]
Weight
11.78 g
Magnetization Direction
↑ axial
Load capacity ~ ?
5.53 kg / 54.23 N
Magnetic Induction ~ ?
277.16 mT
Coating
[NiCuNi] nickel
Manufacturing Tolerance
±0.1 mm

Magnetic properties of material 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 at 20°C

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

The offered product is an exceptionally strong rod magnet, produced from advanced NdFeB material, which, with dimensions of Ø20x5 mm, guarantees maximum efficiency. This specific item features a tolerance of ±0.1mm and professional build quality, making it an ideal solution for professional engineers and designers. As a magnetic rod with significant force (approx. 5.53 kg), this product is in stock from our European logistics center, ensuring lightning-fast order fulfillment. Furthermore, its Ni-Cu-Ni coating effectively protects it against corrosion in standard operating conditions, ensuring an aesthetic appearance and durability for years.
This model is ideal for building electric motors, advanced sensors, and efficient magnetic separators, where field concentration on a small surface counts. Thanks to the pull force of 54.23 N with a weight of only 11.78 g, this rod is indispensable in miniature devices and wherever low weight is crucial.
Due to the delicate structure of the ceramic sinter, we absolutely advise against force-fitting (so-called press-fit), as this risks chipping the coating of this professional component. To ensure long-term durability in industry, anaerobic resins are used, which do not react with the nickel coating and fill the gap, guaranteeing durability of the connection.
Grade N38 is the most popular standard for industrial neodymium magnets, offering a great economic balance and high resistance to demagnetization. If you need the strongest magnets in the same volume (Ø20x5), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard in continuous sale in our warehouse.
The presented product is a neodymium magnet with precisely defined parameters: diameter 20 mm and height 5 mm. The value of 54.23 N means that the magnet is capable of holding a weight many times exceeding its own mass of 11.78 g. The product has a [NiCuNi] coating, which secures it against external factors, giving it an aesthetic, silvery shine.
Standardly, the magnetic axis runs through the center of the cylinder, causing the greatest attraction force to occur on the bases with a diameter of 20 mm. Such an arrangement is standard when connecting magnets in stacks (e.g., in filters) or when mounting in sockets at the bottom of a hole. On request, we can also produce versions magnetized through the diameter if your project requires it.

Strengths as well as weaknesses of NdFeB magnets.

Apart from their consistent magnetism, neodymium magnets have these key benefits:

  • They have constant strength, and over nearly 10 years their attraction force decreases symbolically – ~1% (in testing),
  • Magnets perfectly protect themselves against demagnetization caused by foreign field sources,
  • A magnet with a smooth silver surface is more attractive,
  • They are known for high magnetic induction at the operating surface, making them more effective,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their shape) at temperatures up to 230°C and above...
  • Thanks to the ability of precise shaping and adaptation to specialized solutions, NdFeB magnets can be modeled in a variety of forms and dimensions, which makes them more universal,
  • Huge importance in advanced technology sectors – they serve a role in data components, motor assemblies, advanced medical instruments, and other advanced devices.
  • Compactness – despite small sizes they generate large force, making them ideal for precision applications

Problematic aspects of neodymium magnets: weaknesses and usage proposals

  • Brittleness is one of their disadvantages. Upon strong impact they can fracture. We recommend keeping them in a steel housing, which not only secures them against impacts but also raises their durability
  • We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
  • When exposed to humidity, magnets start to rust. For applications outside, it is recommended to use protective magnets, such as those in rubber or plastics, which prevent oxidation as well as corrosion.
  • We recommend a housing - magnetic mount, due to difficulties in producing nuts inside the magnet and complex forms.
  • Possible danger to health – tiny shards of magnets pose a threat, in case of ingestion, which is particularly important in the context of child health protection. Furthermore, tiny parts of these magnets can complicate diagnosis medical when they are in the body.
  • With large orders the cost of neodymium magnets is a challenge,

Maximum holding power of the magnet – what affects it?

Holding force of 5.53 kg is a measurement result performed under standard conditions:

  • with the contact of a yoke made of special test steel, guaranteeing full magnetic saturation
  • whose transverse dimension is min. 10 mm
  • with an ideally smooth touching surface
  • without any clearance between the magnet and steel
  • for force acting at a right angle (in the magnet axis)
  • in stable room temperature

Practical aspects of lifting capacity – factors

It is worth knowing that the magnet holding may be lower depending on the following factors, in order of importance:

  • Clearance – the presence of foreign body (rust, tape, gap) acts as an insulator, which reduces power steeply (even by 50% at 0.5 mm).
  • Direction of force – highest force is available only during perpendicular pulling. The shear force of the magnet along the plate is usually several times smaller (approx. 1/5 of the lifting capacity).
  • Metal thickness – the thinner the sheet, the weaker the hold. Magnetic flux passes through the material instead of converting into lifting capacity.
  • Plate material – low-carbon steel gives the best results. Alloy admixtures lower magnetic properties and holding force.
  • Surface quality – the smoother and more polished the plate, the larger the contact zone and stronger the hold. Roughness creates an air distance.
  • Thermal factor – hot environment weakens pulling force. Exceeding the limit temperature can permanently demagnetize the magnet.

* Holding force was measured on the plate surface of 20 mm thickness, when a perpendicular force was applied, in contrast under attempts to slide the magnet the holding force is lower. Moreover, even a slight gap {between} the magnet’s surface and the plate decreases the load capacity.

Safety rules for work with NdFeB magnets

Keep away from children

Neodymium magnets are not suitable for play. Eating several magnets may result in them pinching intestinal walls, which constitutes a critical condition and requires urgent medical intervention.

Material brittleness

Beware of splinters. Magnets can explode upon violent connection, launching shards into the air. Wear goggles.

Respect the power

Handle with care. Neodymium magnets act from a distance and connect with huge force, often quicker than you can react.

Fire risk

Drilling and cutting of neodymium magnets poses a fire risk. Neodymium dust oxidizes rapidly with oxygen and is hard to extinguish.

GPS and phone interference

Be aware: neodymium magnets produce a field that interferes with precision electronics. Keep a safe distance from your phone, tablet, and GPS.

Demagnetization risk

Regular neodymium magnets (grade N) lose power when the temperature exceeds 80°C. Damage is permanent.

Protect data

Device Safety: Strong magnets can damage payment cards and delicate electronics (pacemakers, hearing aids, mechanical watches).

Warning for heart patients

For implant holders: Powerful magnets affect electronics. Keep minimum 30 cm distance or request help to work with the magnets.

Bone fractures

Large magnets can crush fingers instantly. Under no circumstances place your hand between two strong magnets.

Sensitization to coating

It is widely known that the nickel plating (the usual finish) is a common allergen. If your skin reacts to metals, prevent touching magnets with bare hands and opt for coated magnets.

Security!

Looking for details? Check our post: Are neodymium magnets dangerous?

Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98