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neodymium magnets

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Magnet for water searching F300 GOLD

Where to buy strong neodymium magnet? Holders with magnets in airtight and durable steel casing are ideally suited for use in variable and difficult weather conditions, including during snow and rain see...

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MW 29x10 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010053

GTIN: 5906301810520

5

Diameter Ø [±0,1 mm]

29 mm

Height [±0,1 mm]

10 mm

Weight

49.54 g

Magnetization Direction

↑ axial

Load capacity

16.04 kg / 157.3 N

Magnetic Induction

351.88 mT

Coating

[NiCuNi] nickel

17.34 with VAT / pcs + price for transport

14.10 ZŁ net + 23% VAT / pcs

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MW 29x10 / N38 - cylindrical magnet

Specification/characteristics MW 29x10 / N38 - cylindrical magnet
properties
values
Cat. no.
010053
GTIN
5906301810520
Production/Distribution
Dhit sp. z o.o.
Country of origin
Poland / China / Germany
Customs code
85059029
Diameter Ø
29 mm [±0,1 mm]
Height
10 mm [±0,1 mm]
Weight
49.54 g [±0,1 mm]
Magnetization Direction
↑ axial
Load capacity ~ ?
16.04 kg / 157.3 N
Magnetic Induction ~ ?
351.88 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

These rod-shaped products are made of the strongest magnetic material in the world. This guarantees high magnetic density while maintaining a small size. Model MW 29x10 / N38 has a pull force of approx. 16.04 kg. The cylindrical form makes them excellent for mounting in drilled holes, electric motors and magnetic separators. The surface is protected by a Ni-Cu-Ni (Nickel-Copper-Nickel) coating.
It is best to use adhesive to fix the magnet 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 brittle material and can easily crack upon impact.
The grade symbol (e.g. N38, N52) defines the magnetic energy density of the material. The higher the number, the stronger the magnet for the same size. The universal option is N38, which provides good performance at a reasonable price. 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. However, they are not fully waterproof. 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.
Their wide application covers advanced technologies. 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. 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 remarkable strength, neodymium magnets offer the following advantages:

  • Their strength is maintained, and after approximately ten years, it drops only by ~1% (theoretically),
  • They are extremely resistant to demagnetization caused by external field interference,
  • The use of a mirror-like silver surface provides a smooth finish,
  • They have extremely strong magnetic induction on the surface of the magnet,
  • These magnets tolerate extreme temperatures, often exceeding 230°C, when properly designed (in relation to profile),
  • The ability for custom shaping and customization to individual needs – neodymium magnets can be manufactured in many forms and dimensions, which extends the scope of their use cases,
  • Key role in cutting-edge sectors – they serve a purpose in hard drives, electromechanical systems, clinical machines and high-tech tools,
  • Thanks to their power density, small magnets offer high magnetic performance, in miniature format,

Disadvantages of NdFeB magnets:

  • They can break when subjected to a sudden impact. If the magnets are exposed to external force, they should be placed in a protective case. The steel housing, in the form of a holder, protects the magnet from cracks and additionally strengthens its overall strength,
  • Magnets lose field strength when exposed to temperatures exceeding 80°C. In most cases, this leads to irreversible field weakening (influenced by the magnet’s dimensions). To address this, we provide [AH] models with superior thermal resistance, able to operate even at 230°C or more,
  • Due to corrosion risk in humid conditions, it is recommended to use sealed magnets made of rubber for outdoor use,
  • The use of a protective casing or external holder is recommended, since machining threads in neodymium magnets is difficult,
  • Possible threat linked to microscopic shards may arise, when consumed by mistake, which is notable in the protection of children. Furthermore, minuscule fragments from these assemblies may interfere with diagnostics once in the system,
  • Higher purchase price is one of the drawbacks compared to ceramic magnets, especially in budget-sensitive applications

Detachment force of the magnet in optimal conditionswhat affects it?

The given lifting capacity of the magnet represents the maximum lifting force, determined in the best circumstances, specifically:

  • with the use of low-carbon steel plate serving as a magnetic yoke
  • with a thickness of minimum 10 mm
  • with a polished side
  • in conditions of no clearance
  • under perpendicular detachment force
  • at room temperature

Practical aspects of lifting capacity – factors

The lifting capacity of a magnet is determined by in practice the following factors, from primary to secondary:

  • 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 testing was carried out on plates with a smooth surface of optimal thickness, under perpendicular forces, in contrast under parallel forces the load capacity is reduced by as much as 5 times. Moreover, even a minimal clearance {between} the magnet’s surface and the plate decreases the load capacity.

Be Cautious with Neodymium Magnets

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

Magnetic 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. They can also damage televisions, VCRs, computer monitors, and CRT displays. You should especially avoid placing neodymium magnets near electronic devices.

Neodymium magnets can become demagnetized 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.

Dust and powder from neodymium magnets are highly flammable.

Do not attempt to drill into neodymium magnets. Mechanical processing is also not recommended. 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 crack or crumble with uncontrolled connecting to each other. Remember not to move them to each other or hold them firmly in hands at a distance less than 10 cm.

The magnet coating is made of nickel, so be cautious if you have an 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.

Neodymium magnetic are fragile and can easily break as well as get damaged.

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. At the moment of collision between the magnets, tiny sharp metal fragments can be propelled in various directions at high speed. Eye protection is recommended.

Neodymium magnets are the most powerful, most remarkable magnets on earth, and the surprising force between them can shock you at first.

On our website, you can find information on how to use neodymium magnets. This will help you avoid injuries and prevent damage to the magnets.

  Magnets are not toys, youngest should not play with them.

Not all neodymium magnets are toys, so do not let children play with them. In the case of small magnets, they can be swallowed and cause choking. In such cases, the only solution is to undergo surgery to remove the magnets, and otherwise, it can even lead to death.

Keep neodymium magnets away from GPS and smartphones.

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

Neodymium magnets should not be near 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.

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