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neodymium magnets

We provide blue color magnetic Nd2Fe14B - our offer. All "magnets" in our store are in stock for immediate delivery (see the list). Check out the magnet pricing for more details see the magnet price list

Magnets for water searching F400 GOLD

Where to buy very strong magnet? Magnetic holders in airtight and durable steel enclosure are ideally suited for use in difficult, demanding weather, including snow and rain read...

magnetic holders

Holders with magnets can be used to enhance production processes, underwater discoveries, or locating meteorites made of metal more...

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UMP 75x25 [M10x3] GW F200 GOLD / N42 - search holder

search holder

Catalog no 210421

GTIN: 5906301814061

5

Diameter Ø [±0,1 mm]

75 mm

Height [±0,1 mm]

25 mm

Weight

900 g

Load capacity

310 kg / 3040.06 N

Coating

[NiCuNi] nickel

150.00 with VAT / pcs + price for transport

121.95 ZŁ net + 23% VAT / pcs

bulk discounts:

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UMP 75x25 [M10x3] GW F200 GOLD / N42 - search holder

Specification/characteristics UMP 75x25 [M10x3] GW F200 GOLD / N42 - search holder
properties
values
Cat. no.
210421
GTIN
5906301814061
Production/Distribution
Dhit sp. z o.o.
Country of origin
Poland / China / Germany
Customs code
85059029
Diameter Ø
75 mm [±0,1 mm]
Height
25 mm [±0,1 mm]
Weight
900 g [±0,1 mm]
Load capacity ~ ?
310 kg / 3040.06 N
Coating
[NiCuNi] nickel
Manufacturing Tolerance
± 0.1 mm

Magnetic properties of material N42

properties
values
units
coercivity bHc ?
860-955
kA/m
coercivity bHc ?
10.8-12.0
kOe
energy density [Min. - Max.] ?
318-334
BH max KJ/m
energy density [Min. - Max.] ?
40-42
BH max MGOe
remenance Br [Min. - Max.] ?
12.9-13.2
kGs
remenance Br [Min. - Max.] ?
1290-1320
T
actual internal force iHc
≥ 955
kA/m
actual internal force iHc
≥ 12
kOe
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 underwater searches, we recommend UMP 75x25 [M10x3] GW F200 GOLD / N42, which is exceptionally strong and has an impressive magnetic pulling force of approximately ~310 kg. This model is ideal for retrieving metal objects at the bottom of water bodies.
Magnetic holders are highly effective for retrieving in water due to their high lifting force. UMP 75x25 [M10x3] GW F200 GOLD / N42 weighing 900 grams with a pulling force of ~310 kg is a perfect solution for recovering lost treasures.
When choosing a magnet for water exploration, you should pay attention to the number of Gauss or Tesla value, which determines the attraction strength. UMP 75x25 [M10x3] GW F200 GOLD / N42 has a pulling force of approximately ~310 kg, making it a effective solution for retrieving heavier items. Remember that the full power is achieved with the upper holder, while the side attachment offers only 10%-25% of that power.
The sliding force of a magnet is typically lower than the perpendicular force because it depends on the fraction of the magnetic field that interacts with the metal surface. In the case of UMP 75x25 [M10x3] GW F200 GOLD / N42 with a pulling force of ~310 kg, full capabilities are achieved with the upper holder, while the side attachment offers only one-fourth to one-quarter 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 lifting force in a perpendicular manner. In a situation where the sliding occurs, the magnet's lifting capacity can be five times lower! Any gap between the magnet and the plate can result in a reduction in the lifting force.
magnetic holder strength F200 GOLD F300 GOLD

Advantages as well as disadvantages of neodymium magnets NdFeB.

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

  • Their strength is maintained, and after around ten years, it drops only by ~1% (according to research),
  • They protect against demagnetization induced by external magnetic influence effectively,
  • In other words, due to the shiny gold coating, the magnet obtains an stylish appearance,
  • The outer field strength of the magnet shows remarkable magnetic properties,
  • They are suitable for high-temperature applications, operating effectively at 230°C+ due to advanced heat resistance and form-specific properties,
  • With the option for fine forming and targeted design, these magnets can be produced in numerous shapes and sizes, greatly improving application potential,
  • Significant impact in cutting-edge sectors – they find application in hard drives, electric motors, clinical machines as well as other advanced devices,
  • Compactness – despite their small size, they provide high effectiveness, making them ideal for precision applications

Disadvantages of NdFeB magnets:

  • They are prone to breaking when subjected to a powerful impact. If the magnets are exposed to external force, it is advisable to use in a steel housing. The steel housing, in the form of a holder, protects the magnet from fracture while also enhances its overall durability,
  • Magnets lose magnetic efficiency when exposed to temperatures exceeding 80°C. In most cases, this leads to irreversible performance loss (influenced by the magnet’s form). To address this, we provide [AH] models with superior thermal resistance, able to operate even at 230°C or more,
  • They rust in a humid environment – during outdoor use, we recommend using sealed magnets, such as those made of non-metallic materials,
  • The use of a protective casing or external holder is recommended, since machining internal cuts in neodymium magnets is risky,
  • Health risk linked to microscopic shards may arise, especially if swallowed, which is important in the protection of children. Moreover, small elements from these assemblies might interfere with diagnostics after being swallowed,
  • Higher purchase price is an important factor to consider compared to ceramic magnets, especially in budget-sensitive applications

Safety Guidelines with Neodymium Magnets

  Neodymium magnets should not be around children.

Not all neodymium magnets are toys, so do not let children play with them. 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.

Magnets will attract to each other, so remember not to allow them to pinch together without control or place your fingers in their path.

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

Keep neodymium magnets away from GPS and smartphones.

Magnetic fields interfere with compasses and magnetometers used in navigation for air and sea transport, as well as internal compasses of smartphones and GPS devices.

Make sure not to bring neodymium magnets close to the 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, etc. devices. They can also damage devices like video players, televisions, CRT computer monitors. Do not forget to keep neodymium magnets at a safe distance from these electronic devices.

Keep neodymium magnets away from 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.

Neodymium magnets can become demagnetized 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.

The magnet coating is made of nickel, so be cautious 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.

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.

Neodymium magnets are noted for their fragility, which can cause them to crumble.

In the event of a collision between two neodymium magnets, it can result in them getting chipped. Despite being made of metal and coated with a shiny nickel plating, they are not as hard as steel. At the moment of collision between the magnets, tiny sharp metal fragments can be propelled in various directions at high speed. Eye protection is recommended.

Neodymium magnets are the strongest magnets ever invented. Their strength can shock you.

Please review the information on how to handle neodymium magnets and avoid significant harm to your body, as well as prevent unintentional damage to the magnets.

Be careful!

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

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