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neodymium magnets

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UMGW 48x24x11.5 [M8] GW / N38 - magnetic holder internal thread

magnetic holder internal thread

Catalog no 180418

GTIN: 5906301813774

5

Diameter Ø [±0,1 mm]

48 mm

Height [±0,1 mm]

24 mm

Height [±0,1 mm]

11.5 mm

Weight

140 g

Load capacity

80 kg / 784.53 N

59.96 with VAT / pcs + price for transport

48.75 ZŁ net + 23% VAT / pcs

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Parameters as well as structure of a neodymium magnet can be reviewed with our force calculator.

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UMGW 48x24x11.5 [M8] GW / N38 - magnetic holder internal thread

Specification/characteristics UMGW 48x24x11.5 [M8] GW / N38 - magnetic holder internal thread
properties
values
Cat. no.
180418
GTIN
5906301813774
Production/Distribution
Dhit sp. z o.o.
Country of origin
Poland / China / Germany
Customs code
85059029
Diameter Ø
48 mm [±0,1 mm]
Height
24 mm [±0,1 mm]
Height
11.5 mm [±0,1 mm]
Weight
140 g [±0,1 mm]
Load capacity ~ ?
80 kg / 784.53 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 female thread are universal accessories, applied in industrial and everyday uses, such as storage facilities. They consist of a magnetic core, usually NdFeB, embedded in a metal housing, covered with zinc to prevent rusting. The internal thread, ranging from M3 to M10, enables mounting bolts, which facilitates assembly of various components, such as signs, instruments, or lights. They work via a strong magnetic field, that focuses in the contact area, ensuring load capacity from 1.3 kg to 60 kg, depending on mount size. These are particularly helpful in the automotive industry, for example, for securing car body components, as well as in marketing, for poster placement. Some models come with a rubber shell, e.g. in black or yellow, which protects surfaces from scratches and increases resistance to dampness. Advantages include high durability, simple mounting thanks to the thread, as well as the option to move massive steel components. Still, the holding force depends on surface thickness, material used, or distance between the holder and the component. Preventing mechanical shocks is crucial, since neodymium magnets are fragile, and overtightening the screw may be dangerous. In addition, a strong magnetic field may affect electronic devices, such as smartphones or magnetic cards, 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 and disadvantages of neodymium magnets NdFeB.

Besides their high retention, neodymium magnets are valued for these benefits:

  • They do not lose their even over around ten years – the reduction of lifting capacity is only ~1% (theoretically),
  • They remain magnetized despite exposure to magnetic noise,
  • In other words, due to the glossy silver coating, the magnet obtains an professional appearance,
  • They have very high magnetic induction on the surface of the magnet,
  • Thanks to their exceptional temperature resistance, they can operate (depending on the shape) even at temperatures up to 230°C or more,
  • With the option for customized forming and targeted design, these magnets can be produced in multiple shapes and sizes, greatly improving application potential,
  • Important function in cutting-edge sectors – they are used in data storage devices, electromechanical systems, medical equipment along with high-tech tools,
  • Compactness – despite their small size, they deliver powerful magnetism, making them ideal for precision applications

Disadvantages of NdFeB magnets:

  • They are fragile when subjected to a powerful impact. If the magnets are exposed to shocks, we recommend in a protective enclosure. The steel housing, in the form of a holder, protects the magnet from fracture , and at the same time increases its overall durability,
  • Magnets lose magnetic efficiency 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,
  • They rust in a moist environment. If exposed to rain, we recommend using sealed magnets, such as those made of rubber,
  • Limited ability to create complex details in the magnet – the use of a external casing is recommended,
  • Possible threat due to small fragments may arise, when consumed by mistake, which is crucial in the protection of children. Moreover, small elements from these assemblies have the potential to disrupt scanning when ingested,
  • High unit cost – neodymium magnets are pricier than other types of magnets (e.g., ferrite), which increases the cost of large-scale applications

Maximum holding power of the magnet – what affects it?

The given holding capacity of the magnet means the highest holding force, calculated under optimal conditions, that is:

  • using a steel plate with low carbon content, serving as a magnetic circuit closure
  • having a thickness of no less than 10 millimeters
  • with a polished side
  • with zero air gap
  • under perpendicular detachment force
  • at room temperature

Lifting capacity in real conditions – factors

Practical lifting force is dependent on elements, by priority:

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

* Holding force was checked on the plate surface of 20 mm thickness, when a perpendicular force was applied, in contrast under shearing force the holding force is lower. Additionally, even a small distance {between} the magnet’s surface and the plate lowers the holding force.

Be Cautious with Neodymium Magnets

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

Neodymium magnets should not be near people with pacemakers.

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.

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

Neodymium magnets generate strong 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. Do not forget to keep neodymium magnets away from these electronic devices.

Dust and powder from neodymium magnets are highly flammable.

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

Never bring neodymium magnets close to a phone and GPS.

Magnetic fields can interfere with compasses and magnetometers used in aviation and maritime navigation, as well as internal compasses of smartphones and GPS devices. There are neodymium magnets in every smartphone, for example, in the microphone and speakers.

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.

It is crucial not to allow the magnets to pinch together uncontrollably or place your fingers in their path as they attract to each other.

Magnets attract each other within a distance of several to around 10 cm from each other. Remember not to place fingers between magnets or alternatively in their path when they attract. Depending on how large the neodymium magnets are, they can lead to a cut or a fracture.

Magnets made of neodymium are fragile and can easily break as well as shatter.

Neodymium magnetic are extremely delicate, and by joining them in an uncontrolled manner, they will crumble. Neodymium magnets are made of metal and coated with a shiny nickel surface, but they are not as hard as steel. In the event of a collision between two magnets, there may be a scattering of fragments in different directions. Protecting your eyes is crucial in such a situation.

 Keep neodymium magnets far from youngest 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 can become demagnetized at high temperatures.

Even though magnets have been found to maintain their efficacy up to temperatures of 80°C or 175°F, it's essential to consider that this threshold may fluctuate depending on the magnet's type, configuration, and intended usage.

Caution!

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

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