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neodymium magnets

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UMH 20x7x35 [M4] / N38 - magnetic holder with hook

magnetic holder with hook

Catalog no 310425

GTIN: 5906301814542

5

Diameter Ø [±0,1 mm]

20 mm

Height [±0,1 mm]

35 mm

Height [±0,1 mm]

7 mm

Weight

21 g

Magnetization Direction

↑ axial

Load capacity

14.5 kg / 142.2 N

Coating

[NiCuNi] nickel

8.59 with VAT / pcs + price for transport

6.98 ZŁ net + 23% VAT / pcs

bulk discounts:

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UMH 20x7x35 [M4] / N38 - magnetic holder with hook

Specification/characteristics UMH 20x7x35 [M4] / N38 - magnetic holder with hook
properties
values
Cat. no.
310425
GTIN
5906301814542
Production/Distribution
Dhit sp. z o.o.
Country of origin
Poland / China / Germany
Customs code
85059029
Diameter Ø
20 mm [±0,1 mm]
Height
35 mm [±0,1 mm]
Height
7 mm [±0,1 mm]
Weight
21 g [±0,1 mm]
Magnetization Direction
↑ axial
Load capacity ~ ?
14.5 kg / 142.2 N
Coating
[NiCuNi] nickel
Manufacturing Tolerance
± 0.1 mm

Magnetic properties of material N38

properties
values
units
coercivity bHc ?
860-915
kA/m
coercivity bHc ?
10.8-11.5
kOe
energy density [Min. - Max.] ?
287-303
BH max KJ/m
energy density [Min. - Max.] ?
36-38
BH max MGOe
remenance Br [Min. - Max.] ?
12.2-12.6
kGs
remenance Br [Min. - Max.] ?
1220-1260
T
actual internal force iHc
≥ 955
kA/m
actual internal force iHc
≥ 12
kOe
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

Advantages as well as disadvantages of neodymium magnets NdFeB.

In addition to their pulling strength, neodymium magnets provide the following advantages:

  • Their magnetic field is durable, and after approximately 10 years, it drops only by ~1% (according to research),
  • Their ability to resist magnetic interference from external fields is among the best,
  • In other words, due to the shiny nickel coating, the magnet obtains an professional appearance,
  • The outer field strength of the magnet shows elevated magnetic properties,
  • They are suitable for high-temperature applications, operating effectively at 230°C+ due to advanced heat resistance and form-specific properties,
  • Thanks to the flexibility in shaping and the capability to adapt to unique requirements, neodymium magnets can be created in various configurations, which increases their functional possibilities,
  • Key role in cutting-edge sectors – they find application in hard drives, electric drives, healthcare devices or even high-tech tools,
  • Relatively small size with high magnetic force – neodymium magnets offer strong power in small dimensions, which allows for use in small systems

Disadvantages of NdFeB magnets:

  • They may fracture when subjected to a sudden impact. If the magnets are exposed to physical collisions, it is suggested to place them in a metal holder. The steel housing, in the form of a holder, protects the magnet from damage and increases its overall durability,
  • Magnets lose pulling force when exposed to temperatures exceeding 80°C. In most cases, this leads to irreversible magnetic decay (influenced by the magnet’s structure). 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 common to use sealed magnets made of rubber for outdoor use,
  • The use of a protective casing or external holder is recommended, since machining multi-axis shapes in neodymium magnets is restricted,
  • Possible threat due to small fragments may arise, especially if swallowed, which is significant in the family environments. It should also be noted that tiny components from these devices might complicate medical imaging if inside the body,
  • In cases of tight budgets, neodymium magnet cost is a challenge,

Safety Precautions

Keep neodymium magnets as far away as possible from GPS and smartphones.

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.

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

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. Avoid placing neodymium magnets in close proximity to electronic devices.

Neodymium magnets can become demagnetized at high temperatures.

Whilst Neodymium magnets can demagnetize at high temperatures, it's important to note that the extent of this effect can vary based on factors such as the magnet's material, shape, and intended application.

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

Neodymium magnetic are fragile and will shatter 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. 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.

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

If joining of neodymium magnets is not controlled, at that time they may crumble and crack. You can't approach them to each other. At a distance less than 10 cm you should hold them very strongly.

  Neodymium magnets should not be around youngest children.

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.

People with pacemakers are advised to avoid neodymium magnets.

Neodymium magnets generate very strong magnetic fields that can interfere with the operation of a pacemaker. This happens because such devices have a function to deactivate them in a magnetic field.

If you have a nickel allergy, avoid contact with neodymium magnets.

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 magnets are among the most powerful magnets on Earth. The astonishing force they generate between each other can shock you.

To handle magnets properly, it is best to familiarize yourself with our information beforehand. This will help you avoid significant harm to your body and the magnets themselves.

Safety precautions!

So you are aware of why neodymium magnets are so dangerous, see the article titled How dangerous are strong neodymium magnets?.

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