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neodymium magnets

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UMGZ 25x17x8 [M5] GZ / N38 - magnetic holder external thread

magnetic holder external thread

Catalog no 190323

GTIN: 5906301813828

5

Diameter Ø [±0,1 mm]

25 mm

Height [±0,1 mm]

17 mm

Height [±0,1 mm]

8 mm

Weight

25 g

Load capacity

17 kg / 166.71 N

12.23 with VAT / pcs + price for transport

9.94 ZŁ net + 23% VAT / pcs

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UMGZ 25x17x8 [M5] GZ / N38 - magnetic holder external thread

Specification/characteristics UMGZ 25x17x8 [M5] GZ / N38 - magnetic holder external thread
properties
values
Cat. no.
190323
GTIN
5906301813828
Production/Distribution
Dhit sp. z o.o.
Country of origin
Poland / China / Germany
Customs code
85059029
Diameter Ø
25 mm [±0,1 mm]
Height
17 mm [±0,1 mm]
Height
8 mm [±0,1 mm]
Weight
25 g [±0,1 mm]
Load capacity ~ ?
17 kg / 166.71 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

Mounts with built-in neodymium magnets featuring an external thread are modern solutions, applied across various industries, such as construction, agriculture, or assembly technology. Their design relies on a strong neodymium magnet, installed within a durable metal casing coated with zinc and nickel. The external thread ranging from M4–M8 enables mounting into threaded holes, which makes it possible to screw in various components. Thanks to a strong magnetic field, these holders provide a holding force from 3 to 68 kg, depending on. Their use include both industrial operations and DIY projects. Some versions feature a protective layer, that protects surfaces from damage and improves moisture resistance. Note, however, that NdFeB magnets are brittle and are prone to cracking under over-tightened mounting. Caution during installation is recommended, and holders should be kept away from electronics. To ensure reliability, one should opt for certified products.

Advantages and disadvantages of neodymium magnets NdFeB.

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

  • They retain their attractive force for almost ten years – the drop is just ~1% (in theory),
  • They show superior resistance to demagnetization from external field exposure,
  • By applying a shiny layer of silver, the element gains a clean look,
  • Magnetic induction on the surface of these magnets is impressively powerful,
  • These magnets tolerate elevated temperatures, often exceeding 230°C, when properly designed (in relation to build),
  • With the option for fine forming and precise design, these magnets can be produced in various shapes and sizes, greatly improving engineering flexibility,
  • Significant impact in new technology industries – they are used in HDDs, electric motors, diagnostic apparatus along with technologically developed systems,
  • Compactness – despite their small size, they generate strong force, 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 external force, they should be placed in a steel housing. The steel housing, in the form of a holder, protects the magnet from cracks while also increases its overall robustness,
  • Magnets lose magnetic efficiency when exposed to temperatures exceeding 80°C. In most cases, this leads to irreversible power drop (influenced by the magnet’s profile). 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 protective material for outdoor use,
  • Using a cover – such as a magnetic holder – is advised due to the challenges in manufacturing threads directly in the magnet,
  • Health risk related to magnet particles may arise, in case of ingestion, which is significant in the family environments. It should also be noted that tiny components from these magnets might disrupt scanning if inside the body,
  • In cases of mass production, neodymium magnet cost is a challenge,

Maximum lifting force for a neodymium magnet – what affects it?

The given lifting capacity of the magnet corresponds to the maximum lifting force, determined in a perfect environment, specifically:

  • with mild steel, used as a magnetic flux conductor
  • of a thickness of at least 10 mm
  • with a refined outer layer
  • with no separation
  • with vertical force applied
  • at room temperature

Determinants of lifting force in real conditions

Practical lifting force is determined by factors, by priority:

  • 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 assessed by applying a polished steel plate of suitable thickness (min. 20 mm), under perpendicular detachment force, in contrast under shearing force the load capacity is reduced by as much as 75%. In addition, even a small distance {between} the magnet and the plate lowers the load capacity.

Precautions

Neodymium magnets can become demagnetized at high temperatures.

Despite the fact that magnets have been observed 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.

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 swellings.

Magnets 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 attract. Magnets, depending on their size, can even cut off a finger or alternatively 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. If the magnet is crushed into fine powder or dust, it becomes highly flammable.

 Maintain neodymium magnets far from children.

Neodymium magnets are not toys. You cannot allow them to become toys for children. 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.

Under no circumstances should neodymium magnets be brought close to GPS and smartphones.

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

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 the strongest magnets ever created, and their strength 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.

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

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

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 is because many of these devices are equipped with a function that deactivates the device in a magnetic field.

Under no circumstances should neodymium magnets be placed 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. You should especially avoid placing neodymium magnets near electronic devices.

Caution!

So that know how powerful neodymium magnets are and why they are so dangerous, see the article - Dangerous powerful neodymium magnets.

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e-mail: bok@dhit.pl

tel: +48 888 99 98 98