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neodymium magnets

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UMGZ 42x20x9 [M8] GZ / N38 - magnetic holder external thread

magnetic holder external thread

Catalog no 190332

GTIN: 5906301813859

5

Diameter Ø [±0,1 mm]

42 mm

Height [±0,1 mm]

20 mm

Height [±0,1 mm]

9 mm

Weight

80 g

Load capacity

66 kg / 647.24 N

33.96 with VAT / pcs + price for transport

27.61 ZŁ net + 23% VAT / pcs

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UMGZ 42x20x9 [M8] GZ / N38 - magnetic holder external thread

Specification/characteristics UMGZ 42x20x9 [M8] GZ / N38 - magnetic holder external thread
properties
values
Cat. no.
190332
GTIN
5906301813859
Production/Distribution
Dhit sp. z o.o.
Country of origin
Poland / China / Germany
Customs code
85059029
Diameter Ø
42 mm [±0,1 mm]
Height
20 mm [±0,1 mm]
Height
9 mm [±0,1 mm]
Weight
80 g [±0,1 mm]
Load capacity ~ ?
66 kg / 647.24 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

Magnetic holders with neodymium magnets featuring an external thread offer robust solutions, used across various fields, including construction, light industry, or assembly technology. The construction is based on a strong NdFeB magnet, embedded within a durable steel housing coated with zinc and nickel. Threaded pin ranging from M3–M10 allows installation into threaded holes, which makes it possible to screw in nameplates, lighting, tools. With the help of a focused magnetic field, such mounts offer a holding force of up to 68 kg, depending on the model and size. Applications of the holders include not only industrial operations and DIY projects. Certain models are equipped with a rubber coating, which protects surfaces from scratches and improves moisture resistance. However, it is important to remember NdFeB magnets are brittle and are prone to cracking under over-tightened mounting. Careful handling is advised, and holders should be kept away from electronics. For best quality, it is advisable to choose models from trusted manufacturers.

Advantages and disadvantages of neodymium magnets NdFeB.

Besides their durability, neodymium magnets are valued for these benefits:

  • They retain their attractive force for nearly 10 years – the loss is just ~1% (according to analyses),
  • Their ability to resist magnetic interference from external fields is notable,
  • In other words, due to the glossy nickel coating, the magnet obtains an aesthetic appearance,
  • They possess strong magnetic force measurable at the magnet’s surface,
  • Neodymium magnets are known for exceptionally strong magnetic induction and the ability to work at temperatures up to 230°C or higher (depending on the geometry),
  • Thanks to the freedom in shaping and the capability to adapt to specific requirements, neodymium magnets can be created in various configurations, which increases their usage potential,
  • Important function in new technology industries – they are used in hard drives, rotating machines, medical equipment as well as other advanced devices,
  • Thanks to their efficiency per volume, small magnets offer high magnetic performance, in miniature format,

Disadvantages of neodymium magnets:

  • They are prone to breaking when subjected to a powerful 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 enhances its overall strength,
  • Magnets lose field strength 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 recommended to use sealed magnets made of synthetic coating for outdoor use,
  • Using a cover – such as a magnetic holder – is advised due to the challenges in manufacturing threads directly in the magnet,
  • Potential hazard from tiny pieces may arise, in case of ingestion, which is important in the protection of children. Furthermore, minuscule fragments from these products can hinder health screening once in the system,
  • Due to a complex production process, their cost is considerably higher,

Maximum holding power of the magnet – what affects it?

The given lifting capacity of the magnet means the maximum lifting force, measured in ideal conditions, that is:

  • with mild steel, serving as a magnetic flux conductor
  • having a thickness of no less than 10 millimeters
  • with a smooth surface
  • with no separation
  • in a perpendicular direction of force
  • under standard ambient temperature

What influences lifting capacity in practice

The lifting capacity of a magnet is determined by in practice key elements, ordered from most important to least significant:

  • 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 testing was carried out on a smooth plate of suitable thickness, under perpendicular forces, in contrast under attempts to slide the magnet the holding force is lower. In addition, even a small distance {between} the magnet and the plate lowers the lifting capacity.

Handle Neodymium Magnets with Caution

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

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. In addition, they can damage televisions, VCRs, computer monitors, and CRT displays. You should especially avoid placing neodymium magnets near electronic devices.

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

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.

Neodymium magnetic are highly fragile, they easily break and can crumble.

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

Avoid bringing neodymium magnets close to a phone or GPS.

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 is coated with nickel. Therefore, exercise caution if you have an allergy.

Studies clearly indicate a small percentage of people who suffer from metal allergies such as 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 not recommended for people with pacemakers.

Neodymium magnets produce strong magnetic fields that can interfere 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.

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

Neodymium magnets are not toys. You cannot allow them to become toys for children. In such a situation, surgery is necessary to remove them. In the worst case scenario, it can result in death.

Dust and powder from neodymium magnets are flammable.

Avoid drilling or mechanical processing of neodymium magnets. 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.

Neodymium magnets will jump and also touch together within a distance of several to around 10 cm from each other.

Neodymium magnets can become demagnetized at high temperatures.

Although magnets have demonstrated their effectiveness up to 80°C or 175°F, the temperature can vary depending on the type, shape, and intended use of the specific magnet.

Warning!

In order for you to know how powerful neodymium magnets are and why they are so dangerous, see the article - Dangerous strong neodymium magnets.

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