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neodymium magnets

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MW 9x3 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010108

GTIN: 5906301811077

5

Diameter Ø [±0,1 mm]

9 mm

Height [±0,1 mm]

3 mm

Weight

1.43 g

Magnetization Direction

↑ axial

Load capacity

1.49 kg / 14.61 N

Magnetic Induction

343.55 mT

Coating

[NiCuNi] nickel

1.132 with VAT / pcs + price for transport

0.920 ZŁ net + 23% VAT / pcs

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MW 9x3 / N38 - cylindrical magnet

Specification/characteristics MW 9x3 / N38 - cylindrical magnet
properties
values
Cat. no.
010108
GTIN
5906301811077
Production/Distribution
Dhit sp. z o.o.
Country of origin
Poland / China / Germany
Customs code
85059029
Diameter Ø
9 mm [±0,1 mm]
Height
3 mm [±0,1 mm]
Weight
1.43 g [±0,1 mm]
Magnetization Direction
↑ axial
Load capacity ~ ?
1.49 kg / 14.61 N
Magnetic Induction ~ ?
343.55 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 sintered Neodymium-Iron-Boron (NdFeB). This ensures huge pull force while maintaining a small size. Model MW 9x3 / N38 has a pull force of approx. 1.49 kg. Their symmetrical shape makes them perfect for mounting in drilled holes, 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). Use strong epoxy resins, which do not react with the nickel coating. Avoid press-fitting with force, as neodymium is a ceramic sinter and is prone to chipping upon impact.
The magnet grade determines the pull force of the material. A higher value means more power for the same size. The universal option is N38, which provides an optimal price-to-power ratio. For projects requiring extreme strength, we recommend grade N52, which is the most powerful option on the market.
Neodymium magnets are coated with a protective layer of Ni-Cu-Ni (Nickel-Copper-Nickel), which protects in indoor conditions. However, they are not fully waterproof. In outdoor or wet conditions, the coating may be damaged, leading to corrosion and loss of power. For such tasks, we suggest enclosing them in a sealed housing or ordering a special version.
These products are the heart of many industrial devices. They are utilized in electric drives and in filters catching metal filings. Additionally, due to their precise dimensions, they are indispensable in Hall effect sensors.
These magnets retain their properties up to 80 degrees Celsius. Above this value, the magnet loses its strength. For more demanding conditions (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 stability, neodymium magnets are valued for these benefits:

  • They virtually do not lose power, because even after ten years, the performance loss is only ~1% (according to literature),
  • Their ability to resist magnetic interference from external fields is impressive,
  • In other words, due to the shiny gold coating, the magnet obtains an professional appearance,
  • 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 as well as adjustment to custom needs – neodymium magnets can be manufactured in multiple variants of geometries, which amplifies their functionality across industries,
  • Key role in modern technologies – they serve a purpose in HDDs, electric motors, healthcare devices along with other advanced devices,
  • Thanks to their efficiency per volume, small magnets offer high magnetic performance, with minimal size,

Disadvantages of neodymium magnets:

  • They are fragile 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 fracture , and at the same time increases its overall durability,
  • They lose magnetic force at extreme temperatures. Most neodymium magnets experience permanent reduction in strength when heated above 80°C (depending on the geometry and height). However, we offer special variants with high temperature resistance that can operate up to 230°C or higher,
  • Magnets exposed to wet conditions can corrode. Therefore, for outdoor applications, we advise waterproof types made of non-metallic composites,
  • Using a cover – such as a magnetic holder – is advised due to the restrictions in manufacturing holes directly in the magnet,
  • Health risk from tiny pieces may arise, if ingested accidentally, which is crucial in the protection of children. It should also be noted that minuscule fragments from these magnets have the potential to hinder health screening if inside the body,
  • Higher purchase price is an important factor to consider compared to ceramic magnets, especially in budget-sensitive applications

Best holding force of the magnet in ideal parameterswhat contributes to it?

The given pulling force of the magnet means the maximum force, assessed in the best circumstances, namely:

  • with the use of low-carbon steel plate serving as a magnetic yoke
  • having a thickness of no less than 10 millimeters
  • with a smooth surface
  • with no separation
  • under perpendicular detachment force
  • in normal thermal conditions

Determinants of lifting force in real conditions

Practical lifting force is determined by factors, listed from the most critical to the less significant:

  • Air gap between the magnet and the plate, since 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.

* Lifting capacity was assessed using a smooth steel plate of suitable thickness (min. 20 mm), under perpendicular detachment force, in contrast under attempts to slide the magnet the lifting capacity is smaller. In addition, even a slight gap {between} the magnet and the plate reduces the lifting capacity.

Safety Precautions

Neodymium magnets are not recommended for 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.

Neodymium magnets can demagnetize at high temperatures.

Although magnets have shown to retain their effectiveness up to 80°C or 175°F, this temperature may vary depending on the type of material, shape, and intended use of the magnet.

Magnets made of neodymium are highly fragile, they easily break as well as can crumble.

In the event of a collision between two neodymium magnets, it can result in them getting chipped. They are coated with a shiny nickel plating similar to steel, but they are not as hard. In the case of a collision between two magnets, there can be a scattering of small sharp metal fragments in different directions. Protecting your eyes is essential.

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.

Avoid bringing neodymium magnets close to a phone or GPS.

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

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

Read the information on our website on how to properly utilize neodymium magnets and avoid significant harm to your body and unintentional damage to the magnets.

 Keep neodymium magnets away from 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.

Dust and powder from neodymium magnets are flammable.

Avoid drilling or mechanical processing of neodymium magnets. If the magnet is crushed into fine powder or dust, it becomes highly flammable.

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.

Magnets will 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 serious injury may occur. Magnets, depending on their size, are able even cut off a finger or there can be a serious pressure or a fracture.

You should keep neodymium magnets at a safe distance from the wallet, computer, and TV.

Strong magnetic fields emitted by neodymium magnets can damage magnetic storage media such as floppy disks, credit cards, magnetic ID cards, cassette tapes, video tapes, or other 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 read the article - What danger lies in neodymium magnets? You will learn how to handle them properly.

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