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neodymium magnets

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UMH 48x11x65 [M6] / N38 - magnetic holder with hook

magnetic holder with hook

Catalog no 310430

GTIN: 5906301814597

5

Diameter Ø [±0,1 mm]

48 mm

Height [±0,1 mm]

65 mm

Height [±0,1 mm]

11 mm

Weight

145 g

Magnetization Direction

↑ axial

Load capacity

88 kg / 862.99 N

Coating

[NiCuNi] nickel

68.88 with VAT / pcs + price for transport

56.00 ZŁ net + 23% VAT / pcs

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UMH 48x11x65 [M6] / N38 - magnetic holder with hook

Specification/characteristics UMH 48x11x65 [M6] / N38 - magnetic holder with hook
properties
values
Cat. no.
310430
GTIN
5906301814597
Production/Distribution
Dhit sp. z o.o.
Country of origin
Poland / China / Germany
Customs code
85059029
Diameter Ø
48 mm [±0,1 mm]
Height
65 mm [±0,1 mm]
Height
11 mm [±0,1 mm]
Weight
145 g [±0,1 mm]
Magnetization Direction
↑ axial
Load capacity ~ ?
88 kg / 862.99 N
Coating
[NiCuNi] nickel
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

They serve to create mobile suspension points without drilling holes. You can use them to organize wires or hang tools on metal shelves.
The magnet has a standard threaded socket, allowing the hook to be exchanged for another accessory. Check the thread size in the product specification to choose matching replacements.
The stated value defines the maximum load when suspended under a ceiling beam. For heavy ceiling advertisements, we recommend choosing a magnet with a large power reserve.
The cup acts as a magnetic yoke, boosting the neodymium's action. The housing ensures mechanical durability, which is important in industrial conditions.
The anti-corrosion coating is sufficient for applications in shops, offices, and dry warehouses. With prolonged contact with moisture outdoors, rust may appear on the housing or hook
On pipes or rounded surfaces, the holding force is much smaller because the magnet only touches linearly. In the case of mounting on a mesh, it is necessary to use two magnets (one in front, one behind) clamping the wire

Advantages as well as disadvantages of neodymium magnets NdFeB.

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

  • They do not lose their power nearly ten years – the reduction of strength is only ~1% (according to tests),
  • Their ability to resist magnetic interference from external fields is among the best,
  • By applying a shiny layer of silver, the element gains a sleek look,
  • They exhibit extremely high 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 accurate shaping as well as adjustment to specific needs – neodymium magnets can be manufactured in a wide range of shapes and sizes, which enhances their versatility in applications,
  • Key role in advanced technical fields – they serve a purpose in data storage devices, rotating machines, medical equipment as well as other advanced devices,
  • Thanks to their efficiency per volume, small magnets offer high magnetic performance, with minimal size,

Disadvantages of magnetic elements:

  • They are prone to breaking when subjected to a sudden impact. If the magnets are exposed to physical collisions, it is advisable to use in a protective enclosure. The steel housing, in the form of a holder, protects the magnet from breakage , and at the same time increases its overall durability,
  • High temperatures may significantly reduce the holding force of neodymium magnets. Typically, above 80°C, they experience permanent weakening in performance (depending on height). 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 wet environment. For outdoor use, we recommend using encapsulated magnets, such as those made of rubber,
  • Limited ability to create complex details in the magnet – the use of a housing is recommended,
  • Safety concern linked to microscopic shards may arise, especially if swallowed, which is important in the protection of children. Furthermore, small elements from these assemblies can disrupt scanning if inside the body,
  • Due to the price of neodymium, their cost is considerably higher,

Optimal lifting capacity of a neodymium magnetwhat it depends on?

The given lifting capacity of the magnet means the maximum lifting force, assessed in the best circumstances, specifically:

  • using a steel plate with low carbon content, acting as a magnetic circuit closure
  • with a thickness of minimum 10 mm
  • with a smooth surface
  • with zero air gap
  • under perpendicular detachment force
  • in normal thermal conditions

Practical lifting capacity: influencing factors

Practical lifting force is dependent on factors, listed from the most critical to the less significant:

  • Air gap between the magnet and the plate, since 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 using a steel plate with a smooth surface of suitable thickness (min. 20 mm), under perpendicular pulling force, whereas under parallel forces the load capacity is reduced by as much as 5 times. Additionally, even a minimal clearance {between} the magnet and the plate reduces the lifting capacity.

Caution with Neodymium Magnets

  Magnets should not be treated as toys. Therefore, it is not recommended for children to have access to them.

Neodymium magnets are not toys. You cannot allow them to become toys for children. Small magnets pose a serious choking hazard or can attract to each other in the intestines. In such cases, the only solution is to undergo surgery to remove the magnets, and otherwise, it can even lead to death.

Neodymium magnets are the most powerful, most remarkable magnets on earth, and the surprising force between them can shock you at first.

To use 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.

The magnet is coated with nickel. Therefore, exercise caution 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, try wearing gloves or avoid direct contact with nickel-plated neodymium magnets.

You should maintain neodymium magnets at a safe distance from the wallet, computer, and TV.

Strong magnetic fields emitted by neodymium magnets can destroy magnetic storage media such as floppy disks, credit cards, magnetic ID cards, cassette tapes, video tapes, or other devices. In addition, they can damage televisions, VCRs, computer monitors, and CRT displays. Avoid placing neodymium magnets in close proximity to electronic devices.

Dust and powder from neodymium magnets are flammable.

Avoid drilling or mechanical processing of neodymium magnets. Once crushed into fine powder or dust, this material becomes highly flammable.

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

Avoid bringing neodymium magnets close to a phone or 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.

Neodymium magnets can attract to each other, pinch the skin, and cause significant swellings.

If you have a finger between or on the path of attracting magnets, there may be a large cut or a fracture.

Magnets made of neodymium are especially delicate, which leads to shattering.

Magnets made of neodymium are delicate and will crack if allowed to collide with each other, even from a distance of a few centimeters. They are coated with a shiny nickel plating similar to steel, but they are not as hard. At the moment of collision between the magnets, small sharp metal fragments can be propelled in various directions at high speed. Eye protection is recommended.

Neodymium magnets can demagnetize 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.

Safety rules!

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

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