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neodymium magnets

We provide yellow color magnets Nd2Fe14B - our store's offer. Practically all "neodymium magnets" in our store are available for immediate delivery (see the list). See the magnet price list for more details check the magnet price list

Magnet for water searching F400 GOLD

Where to purchase powerful neodymium magnet? Magnetic holders in airtight, solid enclosure are perfect for use in variable and difficult weather conditions, including in the rain and snow check...

magnets with holders

Holders with magnets can be used to improve production, exploring underwater areas, or searching for space rocks made of metal read...

Enjoy delivery of your order if the order is placed before 2:00 PM on weekdays.

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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:

Need more?

price from 1 pcs
121.95 ZŁ
150.00 ZŁ
price from 10 pcs
114.63 ZŁ
141.00 ZŁ
price from 25 pcs
107.32 ZŁ
132.00 ZŁ

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Pick up the phone and ask +48 888 99 98 98 alternatively send us a note via contact form through our site.
Lifting power as well as appearance of magnetic components can be verified on our online calculation tool.

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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
remenance Br [Min. - Max.] ?
12.9-13.2
kGs
remenance Br [Min. - Max.] ?
1290-1320
T
coercivity bHc ?
10.8-12.0
kOe
coercivity bHc ?
860-955
kA/m
actual internal force iHc
≥ 12
kOe
actual internal force iHc
≥ 955
kA/m
energy density [Min. - Max.] ?
40-42
BH max MGOe
energy density [Min. - Max.] ?
318-334
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 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 perfect for locating metal objects at the bottom of water bodies.
Neodymium magnets are highly effective for searching in water due to their strong attraction capability. UMP 75x25 [M10x3] GW F200 GOLD / N42 weighing 900 grams with a pulling force of ~310 kg is a great choice for finding metallic findings.
When choosing a magnetic holder for water exploration, you should pay attention to the number of Gauss or Tesla value, which determines the lifting force. UMP 75x25 [M10x3] GW F200 GOLD / N42 has a pulling force of approximately ~310 kg, making it a powerful tool for recovering heavier items. Remember that the maximum strength is achieved with the top attachment, while the side attachment offers only 10%-25% of that power.
The sideways 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 lifting capacity of ~310 kg, full capabilities are achieved with the upper holder, while the side holder offers only one-fourth to one-quarter of the declared force.
he Lifting force was measured under test conditions, using a smooth S235 low-carbon steel plate with a thickness of 10 mm, with the application of pulling force in a perpendicular manner. In a situation where the sliding occurs, the magnet's lifting capacity can be 5 times lower! Any gap between the magnet and the plate can result in a reduction in the attraction force.
magnetic holder strength F200 GOLD F300 GOLD

Advantages as well as disadvantages of neodymium magnets NdFeB.

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

  • They virtually do not lose power, because even after 10 years, the decline in efficiency is only ~1% (based on calculations),
  • They protect against demagnetization induced by ambient magnetic fields remarkably well,
  • By applying a bright layer of gold, the element gains a sleek look,
  • They possess intense magnetic force measurable at the magnet’s surface,
  • These magnets tolerate high temperatures, often exceeding 230°C, when properly designed (in relation to build),
  • Thanks to the possibility in shaping and the capability to adapt to unique requirements, neodymium magnets can be created in various configurations, which broadens their functional possibilities,
  • Key role in cutting-edge sectors – they are utilized in data storage devices, rotating machines, medical equipment as well as sophisticated instruments,
  • Thanks to their concentrated strength, small magnets offer high magnetic performance, while occupying minimal space,

Disadvantages of rare earth magnets:

  • They may fracture when subjected to a strong impact. If the magnets are exposed to mechanical hits, it is advisable to use in a steel housing. The steel housing, in the form of a holder, protects the magnet from damage and strengthens its overall strength,
  • They lose field intensity at extreme temperatures. Most neodymium magnets experience permanent decline in strength when heated above 80°C (depending on the geometry and height). However, we offer special variants with high temperature resistance that can operate up to 230°C or higher,
  • Due to corrosion risk in humid conditions, it is wise to use sealed magnets made of protective material for outdoor use,
  • The use of a protective casing or external holder is recommended, since machining threads in neodymium magnets is difficult,
  • Health risk related to magnet particles may arise, in case of ingestion, which is important in the protection of children. Moreover, tiny components from these assemblies might hinder health screening once in the system,
  • Due to expensive raw materials, their cost is above average,

Magnetic strength at its maximum – what it depends on?

The given lifting capacity of the magnet corresponds to the maximum lifting force, assessed in the best circumstances, that is:

  • with the use of low-carbon steel plate serving as a magnetic yoke
  • of a thickness of at least 10 mm
  • with a polished side
  • in conditions of no clearance
  • under perpendicular detachment force
  • in normal thermal conditions

Magnet lifting force in use – key factors

Practical lifting force is determined by factors, listed from the most critical to the less significant:

  • Air gap between the magnet and the plate, because 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 conducted on plates with a smooth surface of suitable thickness, under a perpendicular pulling force, whereas under shearing force the holding force is lower. Moreover, even a small distance {between} the magnet and the plate lowers the load capacity.

Be Cautious with Neodymium Magnets

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

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

Neodymium magnets are not recommended for people with pacemakers.

Neodymium magnets generate strong magnetic fields. As a result, they interfere with the operation of a pacemaker. This happens because such devices have a function to deactivate them in a magnetic field.

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

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.

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

Neodymium magnets will jump and clash together within a radius of several to around 10 cm from each other.

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.

Neodymium magnets can become demagnetized at high temperatures.

While Neodymium magnets can lose their magnetic properties 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.

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, you can try wearing gloves or simply avoid direct contact with nickel-plated neodymium magnets.

 Maintain neodymium magnets away from children.

Remember that neodymium magnets are not toys. Be cautious and make sure no child plays with them. In the case of swallowing multiple magnets simultaneously, they can attract to each other through the intestinal walls. In the worst case scenario, this can lead to death.

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

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. Remember not to place neodymium magnets close to these electronic devices.

Dust and powder from neodymium magnets are highly flammable.

Avoid drilling or mechanical processing of neodymium magnets. If the magnet is crushed into fine powder or dust, it becomes highly flammable.

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