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neodymium magnets

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MW 8x20 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010475

GTIN: 5906301811138

5

Diameter Ø [±0,1 mm]

8 mm

Height [±0,1 mm]

20 mm

Weight

7.54 g

Magnetization Direction

→ diametrical

Load capacity

8.85 kg / 86.79 N

Magnetic Induction

607.01 mT

Coating

[NiCuNi] nickel

4.60 with VAT / pcs + price for transport

3.74 ZŁ net + 23% VAT / pcs

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MW 8x20 / N38 - cylindrical magnet

Specification/characteristics MW 8x20 / N38 - cylindrical magnet
properties
values
Cat. no.
010475
GTIN
5906301811138
Production/Distribution
Dhit sp. z o.o.
Country of origin
Poland / China / Germany
Customs code
85059029
Diameter Ø
8 mm [±0,1 mm]
Height
20 mm [±0,1 mm]
Weight
7.54 g [±0,1 mm]
Magnetization Direction
→ diametrical
Load capacity ~ ?
8.85 kg / 86.79 N
Magnetic Induction ~ ?
607.01 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

Our cylinder magnets are made of sintered Neodymium-Iron-Boron (NdFeB). This ensures powerful holding force while maintaining compact dimensions. Model MW 8x20 / N38 has a pull force of approx. 8.85 kg. The cylindrical form makes them ideal for mounting in drilled holes, generators and filters. The surface is protected by a Ni-Cu-Ni (Nickel-Copper-Nickel) coating.
We recommend installation by gluing into a hole with a slightly larger diameter (e.g. +0.1 mm clearance). We recommend two-component (epoxy) glues, which do not react with the nickel coating. Do not hit the magnets, 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 universal option is N38, which provides an optimal price-to-power ratio. For demanding applications, we recommend grade N52, which is the most powerful option on the market.
These products have a standard coating of Ni-Cu-Ni (Nickel-Copper-Nickel), which protects in indoor conditions. Please note they are not water-resistant. With constant contact with water or rain, the coating may be damaged, leading to rusting of the magnet. For such tasks, we recommend hermetic sealing or ordering a special version.
Cylindrical magnets are a key component of many modern machines. They are commonly used to build rotors in brushless motors and in filters catching metal filings. Additionally, due to their precise dimensions, they are indispensable in Hall effect sensors.
Standard neodymium magnets (grade N) work safely up to 80°C. Higher temperatures can cause irreversible demagnetization. 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 and disadvantages of neodymium magnets NdFeB.

Besides their high retention, neodymium magnets are valued for these benefits:

  • Their power is durable, and after around 10 years, it drops only by ~1% (theoretically),
  • They are highly resistant to demagnetization caused by external field interference,
  • The use of a decorative silver surface provides a smooth finish,
  • They have very high magnetic induction on the surface of the magnet,
  • Thanks to their enhanced temperature resistance, they can operate (depending on the shape) even at temperatures up to 230°C or more,
  • The ability for accurate shaping or adaptation to custom needs – neodymium magnets can be manufactured in a wide range of shapes and sizes, which enhances their versatility in applications,
  • Significant impact in advanced technical fields – they are utilized in HDDs, electric drives, diagnostic apparatus as well as high-tech tools,
  • Relatively small size with high magnetic force – neodymium magnets offer intense magnetic field in small dimensions, which makes them useful in small systems

Disadvantages of neodymium magnets:

  • They are fragile when subjected to a powerful 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 enhances its overall strength,
  • High temperatures may significantly reduce the field efficiency of neodymium magnets. Typically, above 80°C, they experience permanent loss 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,
  • They rust in a wet environment – during outdoor use, we recommend using moisture-resistant magnets, such as those made of polymer,
  • Limited ability to create threads in the magnet – the use of a mechanical support is recommended,
  • Health risk linked to microscopic shards may arise, if ingested accidentally, which is crucial in the family environments. Additionally, miniature parts from these assemblies can disrupt scanning once in the system,
  • In cases of tight budgets, neodymium magnet cost may not be economically viable,

Optimal lifting capacity of a neodymium magnetwhat it depends on?

The given holding capacity of the magnet means the highest holding force, measured in ideal conditions, namely:

  • with the use of low-carbon steel plate serving as a magnetic yoke
  • with a thickness of minimum 10 mm
  • with a polished side
  • with no separation
  • with vertical force applied
  • in normal thermal conditions

Determinants of practical lifting force of a magnet

In practice, the holding capacity of a magnet is conditioned by these factors, arranged from the most important to the least relevant:

  • Air gap between the magnet and the plate, because even a very small distance (e.g. 0.5 mm) causes 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.

* Lifting capacity was assessed with the use of a polished steel plate of optimal thickness (min. 20 mm), under perpendicular detachment force, however under parallel forces the lifting capacity is smaller. Moreover, even a small distance {between} the magnet and the plate decreases the lifting capacity.

Exercise Caution with Neodymium Magnets

Comparing neodymium magnets to ferrite magnets (found in speakers), they are 10 times more powerful, and their strength can surprise you.

Familiarize yourself with our information to correctly handle these magnets and avoid significant swellings to your body and prevent disruption to the magnets.

Neodymium magnets should not be near people with pacemakers.

Neodymium magnets produce strong magnetic fields that can interfere with the operation of a heart pacemaker. However, if the magnetic field does not affect the device, it can damage its components or deactivate the device when it is in a magnetic field.

Neodymium magnets are primarily characterized by their significant internal force. They attract to each other, and any object that comes in their way will be affected.

Magnets attract each other within a distance of several to around 10 cm from each other. Don't put your fingers in the path of magnet attraction, because a significant injury may occur. Magnets, depending on their size, can even cut off a finger or alternatively there can be a severe pressure or even a fracture.

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 around children.

Remember that neodymium magnets are not toys. Do not allow children to play 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 severe injuries, and even death.

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, you can try wearing gloves or simply avoid direct contact with nickel-plated neodymium magnets.

Neodymium magnets can demagnetize at high temperatures.

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

Magnets made of neodymium are highly susceptible to damage, resulting in their cracking.

Magnets made of neodymium are extremely delicate, and by joining them in an uncontrolled manner, they will crumble. Neodymium magnets are made of metal and coated with a shiny nickel surface, but they are not as hard as steel. At the moment of collision between the magnets, small metal fragments can be dispersed in different directions.

Keep neodymium magnets away from GPS and smartphones.

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

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

Strong fields generated by neodymium magnets can damage magnetic storage media such as floppy disks, credit cards, magnetic ID cards, cassette tapes, video tapes, or other similar devices. In addition, they can damage televisions, VCRs, computer monitors, and CRT displays. You should especially avoid placing neodymium magnets near electronic devices.

Caution!

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

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e-mail: bok@dhit.pl

tel: +48 888 99 98 98