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neodymium magnets

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UMGW 36x18x8 [M8] GW / N38 - magnetic holder internal thread

magnetic holder internal thread

Catalog no 180319

GTIN: 5906301813750

5

Diameter Ø [±0,1 mm]

36 mm

Height [±0,1 mm]

18 mm

Height [±0,1 mm]

8 mm

Weight

52 g

Load capacity

40 kg / 392.27 N

23.99 with VAT / pcs + price for transport

19.50 ZŁ net + 23% VAT / pcs

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UMGW 36x18x8 [M8] GW / N38 - magnetic holder internal thread

Specification/characteristics UMGW 36x18x8 [M8] GW / N38 - magnetic holder internal thread
properties
values
Cat. no.
180319
GTIN
5906301813750
Production/Distribution
Dhit sp. z o.o.
Country of origin
Poland / China / Germany
Customs code
85059029
Diameter Ø
36 mm [±0,1 mm]
Height
18 mm [±0,1 mm]
Height
8 mm [±0,1 mm]
Weight
52 g [±0,1 mm]
Load capacity ~ ?
40 kg / 392.27 N
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

Mounting bases with magnets with internal thread are universal accessories, used in manufacturing and household applications, e.g. in engineering. They consist of a neodymium magnet, typically neodymium, enclosed within a metal shell, coated with zinc for corrosion protection. The internal thread, available in sizes from M4 to M8, allows insertion of bolts, which simplifies installation of different items, like nameplates, instruments, or lamps. They work via a powerful magnetic zone, that focuses in the contact area, ensuring load capacity from 1.3 kg to 60 kg, depending on mount size. They are especially useful in the automotive industry, e.g. for attaching body panels, and also in advertising, for hanging banners. Some models come with a rubber shell, e.g. in black or yellow colors, which protects surfaces from scratches and improves moisture resistance. Advantages include great strength, ease of installation thanks to the thread, and the ability to transport heavy ferromagnetic objects. Still, the holding force relies on surface thickness, material used, and the gap between holder and object. Preventing mechanical shocks is crucial, since neodymium magnets are fragile, and overtightening the screw may be dangerous. In addition, a magnetic zone may interfere with electronics, like phones or data carriers, so holders should be kept away from such equipment. Choosing mounts from trusted suppliers is advised, to ensure high quality and safe use during operation.

Advantages as well as disadvantages of neodymium magnets NdFeB.

Apart from their notable magnetism, neodymium magnets have these key benefits:

  • They have constant strength, and over more than ten years their performance decreases symbolically – ~1% (in testing),
  • They remain magnetized despite exposure to strong external fields,
  • By applying a bright layer of silver, the element gains a modern look,
  • They exhibit elevated levels of magnetic induction near the outer area of the magnet,
  • They are suitable for high-temperature applications, operating effectively at 230°C+ due to advanced heat resistance and form-specific properties,
  • The ability for custom shaping as well as adaptation to specific needs – neodymium magnets can be manufactured in many forms and dimensions, which amplifies their functionality across industries,
  • Important function in cutting-edge sectors – they find application in data storage devices, electromechanical systems, medical equipment as well as technologically developed systems,
  • Compactness – despite their small size, they provide high effectiveness, making them ideal for precision applications

Disadvantages of rare earth magnets:

  • They may fracture when subjected to a powerful impact. If the magnets are exposed to physical collisions, we recommend in a metal holder. The steel housing, in the form of a holder, protects the magnet from cracks and increases its overall durability,
  • High temperatures may significantly reduce the strength of neodymium magnets. Typically, above 80°C, they experience permanent weakening in performance (depending on form). 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 damp environment. If exposed to rain, we recommend using waterproof magnets, such as those made of non-metallic materials,
  • Using a cover – such as a magnetic holder – is advised due to the challenges in manufacturing holes directly in the magnet,
  • Safety concern due to small fragments may arise, when consumed by mistake, which is notable in the protection of children. Moreover, miniature parts from these assemblies may complicate medical imaging when ingested,
  • In cases of tight budgets, neodymium magnet cost is a challenge,

Best holding force of the magnet in ideal parameterswhat it depends on?

The given lifting capacity of the magnet means the maximum lifting force, determined in the best circumstances, that is:

  • using a steel plate with low carbon content, acting as a magnetic circuit closure
  • of a thickness of at least 10 mm
  • with a polished side
  • in conditions of no clearance
  • with vertical force applied
  • under standard ambient temperature

Lifting capacity in practice – influencing factors

In practice, the holding capacity of a magnet is conditioned by the following aspects, in descending order of importance:

  • Air gap between the magnet and the plate, since 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 testing was carried out on a smooth plate of optimal thickness, under perpendicular forces, however under parallel forces the load capacity is reduced by as much as 5 times. In addition, even a small distance {between} the magnet’s surface and the plate decreases the lifting capacity.

Exercise Caution with Neodymium Magnets

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

Please review the information on how to handle neodymium magnets and avoid significant harm to your body, as well as prevent unintentional damage to the magnets.

Neodymium magnets should not be near people with pacemakers.

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.

Keep neodymium magnets away from GPS and smartphones.

Neodymium magnets are a source of intense magnetic fields that cause interference with magnetometers and compasses used in navigation, as well as internal compasses of smartphones and GPS devices.

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

 Keep neodymium magnets far from children.

Not all neodymium magnets are toys, so do not let children play with them. In such a situation, surgery is necessary to remove them. In the worst case scenario, it can result in death.

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 the joining of neodymium magnets is not under control, then they may crumble and crack. Remember not to approach them to each other or have them firmly in hands at a distance less than 10 cm.

Magnets made of neodymium are incredibly delicate, they easily break and can crumble.

Neodymium magnets are characterized by significant fragility. Neodymium magnetic are made of metal and coated with a shiny nickel, but they are not as durable as steel. At the moment of collision between the magnets, sharp metal fragments can be dispersed in different directions.

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.

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

Neodymium magnets produce intense magnetic fields that can damage magnetic media such as floppy disks, video tapes, HDDs, credit cards, magnetic ID cards, cassette tapes, or other devices. They can also destroy videos, televisions, CRT computer monitors. Remember not to place neodymium magnets close to these electronic devices.

Dust and powder from neodymium magnets are 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.

Warning!

To show why neodymium magnets are so dangerous, see the article - How dangerous are very powerful neodymium magnets?.

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