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neodymium magnets

We provide blue color magnetic Nd2Fe14B - our store's offer. All "neodymium magnets" on our website are in stock for immediate delivery (check the list). Check out the magnet price list for more details check the magnet price list

Magnet for searching F300 GOLD

Where to buy strong magnet? Magnetic holders in airtight, solid enclosure are perfect for use in difficult climate conditions, including in the rain and snow see more...

magnetic holders

Holders with magnets can be applied to facilitate manufacturing, underwater exploration, or searching for meteors made of metal check...

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UMP 97x40 [M8+M10] GW F300 kg / N38 - search holder

search holder

Catalog no 210337

GTIN: 5906301813965

5

Diameter Ø [±0,1 mm]

97 mm

Height [±0,1 mm]

40 mm

Weight

2200 g

Load capacity

380 kg / 3726.53 N

Coating

[NiCuNi] nickel

300.00 with VAT / pcs + price for transport

243.90 ZŁ net + 23% VAT / pcs

bulk discounts:

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price from 1 pcs
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Weight along with shape of a neodymium magnet can be verified using our online calculation tool.

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UMP 97x40 [M8+M10] GW F300 kg / N38 - search holder

Specification/characteristics UMP 97x40 [M8+M10] GW F300 kg / N38 - search holder
properties
values
Cat. no.
210337
GTIN
5906301813965
Production/Distribution
Dhit sp. z o.o.
Country of origin
Poland / China / Germany
Customs code
85059029
Diameter Ø
97 mm [±0,1 mm]
Height
40 mm [±0,1 mm]
Weight
2200 g [±0,1 mm]
Load capacity ~ ?
380 kg / 3726.53 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

For exploring rivers and lakes, we recommend UMP 97x40 [M8+M10] GW F300 kg / N38, which is very powerful and has an impressive magnetic pulling force of approximately ~380 kg. This model is perfect for locating metal objects at the bottom of water bodies.
Neodymium magnets are efficient for searching in water due to their high lifting force. UMP 97x40 [M8+M10] GW F300 kg / N38 weighing 2200 grams with a pulling force of ~380 kg is a great choice for finding metallic findings.
When choosing a magnetic holder for underwater searches, you should pay attention to the number of Gauss or Tesla value, which determines the lifting force. UMP 97x40 [M8+M10] GW F300 kg / N38 has a pulling force of approximately ~380 kg, making it a powerful tool for recovering objects with significant mass. Remember that the maximum strength is achieved with the upper holder, while the side attachment offers only 10%-25% of that power.
The sideways force of a magnetic holder is typically lower than the adhesive force because it depends on the fraction of the magnetic field that interacts with the metal surface. In the case of UMP 97x40 [M8+M10] GW F300 kg / N38 with a lifting capacity of ~380 kg, maximum power are achieved with the top attachment, while the side attachment offers only 10%-25% of the stated power.
he Lifting force was measured under laboratory conditions, using a smooth S235 low-carbon steel plate with a thickness of 10 mm, with the application of pulling force in a vertical manner. In a situation where the sliding occurs, the magnet's attraction force can be 5 times lower! Any gap between the magnet and the plate can cause a reduction in the attraction force.
magnetic pot strength F200 GOLD F300 GOLD

Advantages and disadvantages of neodymium magnets NdFeB.

In addition to their remarkable strength, neodymium magnets offer the following advantages:

  • They do not lose their power approximately ten years – the loss of strength is only ~1% (based on measurements),
  • Their ability to resist magnetic interference from external fields is notable,
  • In other words, due to the metallic gold coating, the magnet obtains an stylish appearance,
  • 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,
  • Thanks to the flexibility in shaping and the capability to adapt to specific requirements, neodymium magnets can be created in different geometries, which broadens their usage potential,
  • Significant impact in new technology industries – they are used in hard drives, electric drives, diagnostic apparatus and technologically developed systems,
  • Relatively small size with high magnetic force – neodymium magnets offer intense magnetic field in compact dimensions, which makes them useful in compact constructions

Disadvantages of neodymium magnets:

  • They may fracture when subjected to a heavy impact. If the magnets are exposed to mechanical hits, it is suggested to place them in a protective case. The steel housing, in the form of a holder, protects the magnet from cracks and additionally increases its overall strength,
  • High temperatures may significantly reduce the strength 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,
  • Magnets exposed to moisture can oxidize. Therefore, for outdoor applications, we suggest waterproof types made of coated materials,
  • Using a cover – such as a magnetic holder – is advised due to the challenges in manufacturing holes directly in the magnet,
  • Safety concern from tiny pieces may arise, especially if swallowed, which is important in the family environments. Additionally, miniature parts from these products may interfere with diagnostics if inside the body,
  • In cases of tight budgets, neodymium magnet cost may not be economically viable,

Detachment force of the magnet in optimal conditionswhat contributes to it?

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

  • using a steel plate with low carbon content, acting as a magnetic circuit closure
  • of a thickness of at least 10 mm
  • with a refined outer layer
  • with no separation
  • under perpendicular detachment force
  • at room temperature

Magnet lifting force in use – key factors

The lifting capacity of a magnet is determined by in practice key elements, from primary to secondary:

  • 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 plates with a smooth surface of suitable thickness, under perpendicular forces, in contrast under attempts to slide the magnet the lifting capacity is smaller. Moreover, even a slight gap {between} the magnet and the plate lowers the load capacity.

Caution with Neodymium Magnets

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

Magnets will attract each other within a distance of several to about 10 cm from each other. Don't put your fingers in the path of magnet attraction, because a serious injury may occur. Magnets, depending on their size, can even cut off a finger or there can be a significant pressure or even a fracture.

Do not bring neodymium magnets close to GPS and smartphones.

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

Neodymium magnets can demagnetize 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.

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

Remember that neodymium magnets are not toys. Be cautious and make sure no child plays with them. Small magnets can pose a serious choking hazard. If multiple magnets are swallowed, they can attract to each other through the intestinal walls, causing severe injuries, and even death.

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.

The magnet coating contains nickel, so be cautious if you have a nickel 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, you can try wearing gloves or simply avoid direct contact with nickel-plated neodymium magnets.

Neodymium magnets are over 10 times more powerful than ferrite magnets (the ones in speakers), and their strength can surprise you.

Read the information on our website on how to properly utilize neodymium magnets and avoid significant harm to your body and unintentional disruption to the magnets.

Make sure not to bring neodymium magnets close to the TV, wallet, and computer HDD.

The strong magnetic field generated by neodymium magnets can destroy magnetic media such as floppy disks, video tapes, HDDs, credit cards, magnetic ID cards, cassette tapes, etc. devices. They can also damage videos, televisions, CRT computer monitors. Do not forget to keep neodymium magnets away from these electronic devices.

Magnets made of neodymium are noted for being fragile, which can cause them to 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. 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.

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

Be careful!

Please read the article - What danger lies in neodymium magnets? You will learn how to handle them properly.

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e-mail: bok@dhit.pl

tel: +48 888 99 98 98