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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 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 the strongest magnetic material in the world. This ensures powerful holding force while maintaining a small size. Model MW 15x4 / N38 has a pull force of approx. 3.32 kg. Their symmetrical shape makes them ideal for installing in sockets, generators and magnetic separators. 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 do not react with the nickel coating. Avoid press-fitting with force, as neodymium is a brittle material 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 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.
Neodymium magnets are coated with a protective layer of Ni-Cu-Ni (Nickel-Copper-Nickel), which provides basic protection. Please note they are not water-resistant. With constant contact with water or rain, 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 used in generators and wind turbines and in filters catching metal filings. 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), we offer H, SH, or UH series on request. 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 immense pulling force, neodymium magnets offer the following advantages:

  • They virtually do not lose strength, because even after ten years, the decline in efficiency is only ~1% (in laboratory conditions),
  • Their ability to resist magnetic interference from external fields is impressive,
  • The use of a decorative nickel surface provides a eye-catching finish,
  • Magnetic induction on the surface of these magnets is impressively powerful,
  • Thanks to their enhanced temperature resistance, they can operate (depending on the form) even at temperatures up to 230°C or more,
  • The ability for accurate shaping and adaptation to individual needs – neodymium magnets can be manufactured in multiple variants of geometries, which enhances their versatility in applications,
  • Significant impact in modern technologies – they serve a purpose in data storage devices, rotating machines, clinical machines along with high-tech tools,
  • Relatively small size with high magnetic force – neodymium magnets offer intense magnetic field in compact dimensions, which allows for use in small systems

Disadvantages of magnetic elements:

  • They are fragile when subjected to a heavy impact. If the magnets are exposed to shocks, we recommend in a metal holder. The steel housing, in the form of a holder, protects the magnet from breakage and additionally strengthens its overall resistance,
  • They lose field intensity at increased temperatures. Most neodymium magnets experience permanent decline in strength when heated above 80°C (depending on the dimensions 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 oxidize. 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 limitations in manufacturing holes directly in the magnet,
  • Potential hazard from tiny pieces may arise, especially if swallowed, which is significant in the context of child safety. It should also be noted that miniature parts from these assemblies can complicate medical imaging when ingested,
  • Due to a complex production process, their cost is above average,

Best holding force of the magnet in ideal parameterswhat affects it?

The given pulling force of the magnet means the maximum force, determined in ideal conditions, specifically:

  • using a steel plate with low carbon content, acting as a magnetic circuit closure
  • of a thickness of at least 10 mm
  • with a smooth surface
  • with no separation
  • with vertical force applied
  • in normal thermal conditions

Lifting capacity in practice – influencing factors

In practice, the holding capacity of a magnet is affected by the following aspects, from crucial to less important:

  • 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.

* Lifting capacity was measured using a polished steel plate of optimal thickness (min. 20 mm), under perpendicular detachment force, in contrast under parallel forces the load capacity is reduced by as much as fivefold. In addition, even a small distance {between} the magnet and the plate reduces the load capacity.

Caution with Neodymium Magnets

Neodymium magnets are the strongest magnets ever created, and their strength can surprise you.

Make sure to review all the information we have provided. This will help you avoid harm to your body and damage to the magnets.

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.

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

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

 It is important to maintain neodymium magnets out of reach from children.

Remember that neodymium magnets are not toys. Be cautious and make sure no child plays with them. In the case of swallowing multiple magnets simultaneously, they can attract to each other through the intestinal walls. In the worst case scenario, this can lead to death.

Keep neodymium magnets away from GPS and smartphones.

Neodymium magnets generate strong magnetic fields that interfere with magnetometers and compasses used in navigation, as well as internal compasses of smartphones and GPS devices.

People with pacemakers are advised to avoid neodymium magnets.

Neodymium magnets generate strong magnetic fields. As a result, they interfere with the operation of a pacemaker. This happens because such devices have a function to deactivate them in a magnetic field.

Neodymium magnets can become demagnetized at high temperatures.

Under specific conditions, Neodymium magnets can lose their magnetism when subjected to high temperatures.

Neodymium magnets can attract to each other, pinch the skin, and cause significant swellings.

Magnets will attract each other within a distance of several to about 10 cm from each other. Remember not to put fingers between magnets or in their path when they attract. Magnets, depending on their size, are able even cut off a finger or there can be a significant pressure or 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.

Magnets made of neodymium are extremely fragile, resulting in their cracking.

In the event of a collision between two neodymium magnets, it can result in them getting chipped. Despite being made of metal and coated with a shiny nickel plating, they are not as hard as steel. At the moment of connection between the magnets, small sharp metal fragments can be propelled in various directions at high speed. Eye protection is recommended.

Be careful!

To raise awareness of why neodymium magnets are so dangerous, read the article titled How dangerous are very powerful neodymium magnets?.

Dhit sp. z o.o. logo

e-mail: bok@dhit.pl

tel: +48 888 99 98 98