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neodymium magnets

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MW 15x4 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010030

GTIN: 5906301810292

5

Diameter Ø [±0,1 mm]

15 mm

Height [±0,1 mm]

4 mm

Weight

5.3 g

Magnetization Direction

↑ axial

Load capacity

3.32 kg / 32.56 N

Magnetic Induction

291.60 mT

Coating

[NiCuNi] nickel

1.968 with VAT / pcs + price for transport

1.600 ZŁ net + 23% VAT / pcs

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MW 15x4 / N38 - cylindrical magnet
Specification/characteristics MW 15x4 / N38 - cylindrical magnet
properties
values
Cat. no.
010030
GTIN
5906301810292
Production/Distribution
Dhit sp. z o.o.
Country of origin
Poland / China / Germany
Customs code
85059029
Diameter Ø
15 mm [±0,1 mm]
Height
4 mm [±0,1 mm]
Weight
5.3 g [±0,1 mm]
Magnetization Direction
↑ axial
Load capacity ~ ?
3.32 kg / 32.56 N
Magnetic Induction ~ ?
291.60 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

This product is an extremely powerful cylinder magnet, composed of advanced NdFeB material, which, at dimensions of Ø15x4 mm, guarantees maximum efficiency. This specific item is characterized by high dimensional repeatability and industrial build quality, making it an excellent solution for the most demanding engineers and designers. As a cylindrical magnet with impressive force (approx. 3.32 kg), this product is in stock from our warehouse in Poland, ensuring rapid order fulfillment. Furthermore, its triple-layer Ni-Cu-Ni coating effectively protects it against corrosion in typical operating conditions, guaranteeing an aesthetic appearance and durability for years.
It finds application in DIY projects, advanced automation, and broadly understood industry, serving as a positioning or actuating element. Thanks to the pull force of 32.56 N with a weight of only 5.3 g, this cylindrical magnet is indispensable in electronics and wherever every gram matters.
Due to the brittleness of the NdFeB material, you must not use force-fitting (so-called press-fit), as this risks chipping the coating of this professional component. To ensure stability in automation, 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 frequently chosen standard for industrial neodymium magnets, offering an optimal price-to-power ratio and high resistance to demagnetization. If you need the strongest magnets in the same volume (Ø15x4), 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 15 mm and height 4 mm. The key parameter here is the holding force amounting to approximately 3.32 kg (force ~32.56 N), which, with such compact dimensions, proves the high power of the NdFeB material. The product has a [NiCuNi] coating, which protects the surface against oxidation, giving it an aesthetic, silvery shine.
This rod magnet is magnetized axially (along the height of 4 mm), which means that the N and S poles are located on the flat, circular surfaces. Such an arrangement is most desirable 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 diametrically if your project requires it.

Strengths and weaknesses of neodymium magnets.

In addition to their long-term stability, neodymium magnets provide the following advantages:

  • They retain full power for around 10 years – the loss is just ~1% (in theory),
  • Magnets perfectly protect themselves against loss of magnetization caused by foreign field sources,
  • Thanks to the metallic finish, the coating of nickel, gold, or silver gives an aesthetic appearance,
  • Magnetic induction on the top side of the magnet turns out to be extremely intense,
  • Thanks to resistance to high temperature, they can operate (depending on the shape) even at temperatures up to 230°C and higher...
  • Thanks to modularity in shaping and the ability to adapt to complex applications,
  • Universal use in modern technologies – they serve a role in magnetic memories, motor assemblies, advanced medical instruments, also technologically advanced constructions.
  • Thanks to efficiency per cm³, small magnets offer high operating force, with minimal size,

Disadvantages of NdFeB magnets:

  • To avoid cracks upon strong impacts, we recommend using special steel holders. Such a solution protects the magnet and simultaneously improves its durability.
  • Neodymium magnets decrease their strength under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures up to 230°C
  • When exposed to humidity, magnets usually rust. To use them in conditions outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which secure oxidation as well as corrosion.
  • We suggest a housing - magnetic mount, due to difficulties in creating nuts inside the magnet and complex forms.
  • Possible danger resulting from small fragments of magnets can be dangerous, in case of ingestion, which gains importance in the context of child health protection. Furthermore, small components of these devices can disrupt the diagnostic process medical after entering the body.
  • With large orders the cost of neodymium magnets is a challenge,

Maximum lifting capacity of the magnetwhat affects it?

The load parameter shown concerns the maximum value, measured under laboratory conditions, specifically:

  • using a sheet made of high-permeability steel, acting as a magnetic yoke
  • possessing a massiveness of min. 10 mm to avoid saturation
  • with a plane free of scratches
  • with direct contact (no impurities)
  • during detachment in a direction perpendicular to the mounting surface
  • at temperature room level

Practical aspects of lifting capacity – factors

In real-world applications, the actual holding force is determined by a number of factors, ranked from the most important:

  • Space between surfaces – even a fraction of a millimeter of distance (caused e.g. by varnish or dirt) significantly weakens the pulling force, often by half at just 0.5 mm.
  • Force direction – declared lifting capacity refers to detachment vertically. When applying parallel force, the magnet holds significantly lower power (typically approx. 20-30% of maximum force).
  • Substrate thickness – for full efficiency, the steel must be adequately massive. Thin sheet restricts the lifting capacity (the magnet "punches through" it).
  • Chemical composition of the base – low-carbon steel gives the best results. Alloy admixtures lower magnetic permeability and holding force.
  • Smoothness – full contact is possible only on smooth steel. Rough texture reduce the real contact area, reducing force.
  • Temperature – heating the magnet causes a temporary drop of induction. It is worth remembering the thermal limit for a given model.

* Holding force was measured on the plate surface of 20 mm thickness, when a perpendicular force was applied, whereas under parallel forces the lifting capacity is smaller. Additionally, even a slight gap {between} the magnet’s surface and the plate lowers the lifting capacity.

Safe handling of neodymium magnets

Magnet fragility

Beware of splinters. Magnets can fracture upon violent connection, ejecting shards into the air. We recommend safety glasses.

Magnetic interference

Navigation devices and mobile phones are extremely sensitive to magnetism. Direct contact with a strong magnet can decalibrate the sensors in your phone.

Keep away from computers

Data protection: Strong magnets can damage payment cards and sensitive devices (heart implants, medical aids, timepieces).

Nickel coating and allergies

Some people suffer from a contact allergy to Ni, which is the typical protective layer for NdFeB magnets. Prolonged contact can result in dermatitis. We recommend use protective gloves.

Safe operation

Be careful. Neodymium magnets act from a distance and snap with massive power, often faster than you can move away.

Serious injuries

Risk of injury: The pulling power is so great that it can result in hematomas, crushing, and even bone fractures. Protective gloves are recommended.

Permanent damage

Control the heat. Exposing the magnet to high heat will destroy its properties and strength.

ICD Warning

Patients with a ICD have to maintain an absolute distance from magnets. The magnetism can stop the functioning of the implant.

No play value

NdFeB magnets are not toys. Accidental ingestion of a few magnets may result in them connecting inside the digestive tract, which poses a severe health hazard and requires immediate surgery.

Do not drill into magnets

Drilling and cutting of NdFeB material carries a risk of fire hazard. Neodymium dust oxidizes rapidly with oxygen and is hard to extinguish.

Safety First!

Learn more about risks in the article: Magnet Safety Guide.

Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98