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neodymium magnets

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MW 2x4 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010055

GTIN: 5906301810544

5

Diameter Ø [±0,1 mm]

2 mm

Height [±0,1 mm]

4 mm

Weight

0.09 g

Magnetization Direction

↑ axial

Load capacity

0.44 kg / 4.31 N

Magnetic Induction

597.70 mT

Coating

[NiCuNi] nickel

0.209 with VAT / pcs + price for transport

0.1700 ZŁ net + 23% VAT / pcs

bulk discounts:

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price from 1 pcs
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0.209 ZŁ
price from 5000 pcs
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0.1777 ZŁ

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MW 2x4 / N38 - cylindrical magnet

Specification/characteristics MW 2x4 / N38 - cylindrical magnet
properties
values
Cat. no.
010055
GTIN
5906301810544
Production/Distribution
Dhit sp. z o.o.
Country of origin
Poland / China / Germany
Customs code
85059029
Diameter Ø
2 mm [±0,1 mm]
Height
4 mm [±0,1 mm]
Weight
0.09 g [±0,1 mm]
Magnetization Direction
↑ axial
Load capacity ~ ?
0.44 kg / 4.31 N
Magnetic Induction ~ ?
597.70 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 NdFeB

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

Cylindrical magnets from this series are made of the strongest magnetic material in the world. As a result, they offer powerful holding force while maintaining a small size. Model MW 2x4 / N38 has a pull force of approx. 0.44 kg. The cylindrical form makes them excellent for installing in sockets, electric motors and filters. The surface is protected by a Ni-Cu-Ni (Nickel-Copper-Nickel) coating.
The best and safest method is gluing into a hole with a slightly larger diameter (e.g. +0.1 mm clearance). We recommend two-component (epoxy) glues, which are safe for the anti-corrosion layer. Avoid press-fitting with force, as neodymium is a ceramic sinter and is prone to chipping upon impact.
The grade symbol (e.g. N38, N52) defines the magnetic energy density of the material. Larger numbers indicate a stronger magnetic field for the same size. The market standard is N38, which provides good performance at a reasonable price. For demanding applications, we recommend grade N52, which is the strongest commercially available sinter.
We use a protective plating of Ni-Cu-Ni (Nickel-Copper-Nickel), which protects against air humidity. Please note they are not water-resistant. In outdoor or wet conditions, the coating may be damaged, leading to rusting of the magnet. For such tasks, we recommend hermetic sealing or ordering a special version.
Their wide application covers advanced technologies. They are commonly used to build rotors in brushless motors and in magnetic separators for cleaning bulk products. Additionally, due to their precise dimensions, they are indispensable in Hall effect sensors.
The maximum operating temperature for the standard version is 80°C (176°F). Above this value, the magnet loses its strength. If you need resistance to higher temperatures (e.g. 120°C, 150°C, 200°C), ask about high-temperature versions (H, SH, UH). It is worth knowing that neodymium magnets do not tolerate thermal shock well.

Advantages as well as disadvantages of neodymium magnets NdFeB.

In addition to their tremendous strength, neodymium magnets offer the following advantages:

  • They retain their full power for almost 10 years – the drop is just ~1% (in theory),
  • They are highly resistant to demagnetization caused by external magnetic fields,
  • The use of a mirror-like silver surface provides a eye-catching finish,
  • Magnetic induction on the surface of these magnets is impressively powerful,
  • They are suitable for high-temperature applications, operating effectively at 230°C+ due to advanced heat resistance and form-specific properties,
  • The ability for accurate shaping or customization to custom needs – neodymium magnets can be manufactured in a wide range of shapes and sizes, which enhances their versatility in applications,
  • Key role in modern technologies – they find application in HDDs, electric drives, medical equipment or even other advanced devices,
  • Relatively small size with high magnetic force – neodymium magnets offer intense magnetic field in small dimensions, which makes them useful in miniature devices

Disadvantages of neodymium magnets:

  • They may fracture when subjected to a heavy impact. If the magnets are exposed to physical collisions, it is suggested to place them in a protective case. The steel housing, in the form of a holder, protects the magnet from cracks , and at the same time strengthens its overall strength,
  • High temperatures may significantly reduce the strength of neodymium magnets. Typically, above 80°C, they experience permanent weakening in performance (depending on shape). To prevent this, we offer heat-resistant magnets marked [AH], capable of working up to 230°C, which makes them perfect for high-temperature use,
  • Magnets exposed to damp air can rust. Therefore, for outdoor applications, it's best to use waterproof types made of non-metallic composites,
  • The use of a protective casing or external holder is recommended, since machining fine details in neodymium magnets is difficult,
  • Health risk linked to microscopic shards may arise, especially if swallowed, which is significant in the family environments. Moreover, small elements from these magnets may hinder health screening after being swallowed,
  • Due to expensive raw materials, their cost is considerably higher,

Maximum lifting force for a neodymium magnet – what it depends on?

The given strength of the magnet corresponds to the optimal strength, assessed in the best circumstances, that is:

  • with mild steel, used as a magnetic flux conductor
  • of a thickness of at least 10 mm
  • with a refined outer layer
  • with no separation
  • in a perpendicular direction of force
  • at room temperature

Lifting capacity in practice – influencing factors

Practical lifting force is dependent on factors, by priority:

  • Air gap between the magnet and the plate, because even a very small distance (e.g. 0.5 mm) can cause a drop in lifting force of up to 50%.
  • Direction of applied force, because the maximum lifting capacity is achieved under perpendicular application. The force required to slide the magnet along the plate is usually several times lower.
  • Thickness of the plate, as a plate that is too thin causes part of the magnetic flux not to be used and to remain wasted in the air.
  • Material of the plate, because higher carbon content lowers holding force, while higher iron content increases it. The best choice is steel with high magnetic permeability and high saturation induction.
  • Surface of the plate, because the more smooth and polished it is, the better the contact and consequently the greater the magnetic saturation.
  • Operating temperature, since all permanent magnets have a negative temperature coefficient. This means that at high temperatures they are weaker, while at sub-zero temperatures they become slightly stronger.

* Holding force was checked on the plate surface of 20 mm thickness, when the force acted perpendicularly, whereas under shearing force the load capacity is reduced by as much as 5 times. In addition, even a small distance {between} the magnet’s surface and the plate reduces the lifting capacity.

Handle with Care: Neodymium Magnets

 Keep neodymium magnets away from youngest children.

Not all neodymium magnets are toys, so do not let children play with them. Small magnets pose a serious choking hazard or can attract to each other in the intestines. In such cases, the only solution is to undergo surgery to remove the magnets, and otherwise, it can even lead to death.

Magnets made of neodymium are extremely delicate, they easily fall apart and can crumble.

Neodymium magnetic are delicate and will break if allowed to collide with each other, even from a distance of a few centimeters. Despite being made of metal as well as coated with a shiny nickel plating, they are not as hard as steel. At the moment of collision between the magnets, small sharp metal fragments can be propelled in various directions at high speed. Eye protection is recommended.

Neodymium magnets are the most powerful magnets ever created, and their power can shock 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.

Avoid contact with neodymium magnets if you have a nickel 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.

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.

Keep neodymium magnets as far away as possible 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.

Keep neodymium magnets away from people with pacemakers.

In the case of neodymium magnets, there is a strong magnetic field. As a result, it interferes with the operation of a heart pacemaker. Even if the magnetic field does not affect the device, it can damage its components or deactivate the entire device.

Do not place neodymium magnets near a computer HDD, TV, and wallet.

Neodymium magnets produce intense magnetic fields that can destroy magnetic media such as floppy disks, video tapes, HDDs, credit cards, magnetic ID cards, cassette tapes, or other devices. They can also destroy devices like video players, televisions, CRT computer monitors. Do not forget to keep neodymium magnets away from these electronic devices.

Neodymium magnets can become demagnetized at high temperatures.

Despite the fact that magnets have been found 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.

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.

If you have a finger between or alternatively on the path of attracting magnets, there may be a serious cut or a fracture.

Safety precautions!

Please read the article - What danger lies in neodymium magnets? You will learn how to handle them properly.

Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98