e-mail: bok@dhit.pl

neodymium magnets

We offer red color magnets Nd2Fe14B - our proposal. All magnesy in our store are in stock for immediate delivery (check the list). See the magnet price list for more details check the magnet price list

Magnet for treasure hunters F300 GOLD

Where to purchase very strong neodymium magnet? Magnetic holders in airtight, solid enclosure are excellent for use in difficult, demanding weather, including in the rain and snow see more

magnets with holders

Magnetic holders can be used to facilitate production processes, underwater discoveries, or searching for space rocks made of metal see more...

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Dhit sp. z o.o.
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UMP 75x24 [M8+M10] GW F 200 kg - search holder

search holder

Catalog no 210336

GTIN: 5906301813958

0

Diameter Ø

75 mm [±1 mm]

Height

24 mm [±1 mm]

Weight

900 g

Load capacity

280 kg / 2745.86 N

Coating

[NiCuNi] nickel

200.00 with VAT / pcs + price for transport

162.60 ZŁ net + 23% VAT / pcs

bulk discounts:

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Lifting power as well as form of a magnet can be reviewed on our our magnetic calculator.

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UMP 75x24 [M8+M10] GW F 200 kg - search holder
Specification/characteristics UMP 75x24 [M8+M10] GW F 200 kg - search holder
properties
values
Cat. no.
210336
GTIN
5906301813958
Production/Distribution
Dhit sp. z o.o.
Country of origin
Poland / China / Germany
Customs code
85059029
Diameter Ø
75 mm [±1 mm]
Height
24 mm [±1 mm]
Weight
900 g
Load capacity ~ ?
280 kg / 2745.86 N
Coating
[NiCuNi] nickel
Manufacturing Tolerance
±1 mm

Magnetic properties of material

properties
values
units

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

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

The best choice are magnets in thick, chrome-plated housings dedicated to water applications. This specific magnet ensures a laboratory lifting capacity of up to 280 kg, which translates into high effectiveness in water. For beginners, we recommend lighter single-sided models (F80-F200), for advanced users - heavier double-sided (Two-Side) ones.
The double-sided model attracts from above and below, increasing the chance of hooking a find. Top mounting works well when fishing from a bridge, pier, or well (vertical technique). Single-sided magnets are usually lighter and cheaper but less effective for long throws.
The magnet is glued into a solid steel cup and sealed with epoxy resin, protecting it from water. The housing significantly increases lifespan but does not make the magnet completely indestructible. Maintenance (e.g., WD-40) prevents surface corrosion of the steel housing.
Check the product title and description to see if you are buying just the magnet or the XL set. We often add thread glue to secure the eyelet against unscrewing in water. We recommend always securing the thread with glue or tightening the eyelet firmly before first use.
It is a technical parameter defining perpendicular break force, not the weight of an object in water. The magnet may slide on round elements (bicycle frame) due to the small contact area. A large power reserve is essential in real search conditions.
Searches are allowed as long as you do not interfere with archaeological sites or search for weapons. We recommend familiarizing yourself with current local regulations and heritage protection laws.

Advantages as well as disadvantages of rare earth magnets.

Besides their tremendous pulling force, neodymium magnets offer the following advantages:

  • They have constant strength, and over nearly 10 years their attraction force decreases symbolically – ~1% (according to theory),
  • Neodymium magnets are distinguished by exceptionally resistant to magnetic field loss caused by external magnetic fields,
  • The use of an metallic coating of noble metals (nickel, gold, silver) causes the element to present itself better,
  • The surface of neodymium magnets generates a intense magnetic field – this is a distinguishing feature,
  • Through (adequate) combination of ingredients, they can achieve high thermal resistance, enabling operation at temperatures approaching 230°C and above...
  • Thanks to the possibility of precise molding and adaptation to custom needs, NdFeB magnets can be created in a broad palette of forms and dimensions, which amplifies use scope,
  • Versatile presence in modern industrial fields – they are utilized in magnetic memories, motor assemblies, diagnostic systems, also industrial machines.
  • Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Disadvantages of NdFeB magnets:

  • To avoid cracks upon strong impacts, we suggest using special steel holders. Such a solution secures the magnet and simultaneously increases its durability.
  • Neodymium magnets decrease their force under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures up to 230°C
  • When exposed to humidity, magnets start to rust. For applications outside, it is recommended to use protective magnets, such as those in rubber or plastics, which prevent oxidation and corrosion.
  • We suggest a housing - magnetic mechanism, due to difficulties in realizing nuts inside the magnet and complicated forms.
  • Potential hazard resulting from small fragments of magnets are risky, if swallowed, which becomes key in the aspect of protecting the youngest. It is also worth noting that small elements of these magnets can be problematic in diagnostics medical when they are in the body.
  • Due to expensive raw materials, their price exceeds standard values,

Best holding force of the magnet in ideal parameterswhat contributes to it?

Information about lifting capacity was defined for the most favorable conditions, including:

  • on a base made of mild steel, optimally conducting the magnetic flux
  • with a thickness of at least 10 mm
  • with a surface cleaned and smooth
  • with direct contact (without impurities)
  • under vertical force vector (90-degree angle)
  • in stable room temperature

Lifting capacity in practice – influencing factors

Bear in mind that the application force may be lower subject to elements below, in order of importance:

  • Space between surfaces – even a fraction of a millimeter of distance (caused e.g. by veneer or unevenness) diminishes the magnet efficiency, often by half at just 0.5 mm.
  • Pull-off angle – remember that the magnet has greatest strength perpendicularly. Under sliding down, the capacity drops significantly, often to levels of 20-30% of the nominal value.
  • Wall thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field passes through the material instead of generating force.
  • Plate material – mild steel attracts best. Alloy admixtures reduce magnetic properties and lifting capacity.
  • Surface condition – ground elements guarantee perfect abutment, which increases force. Uneven metal reduce efficiency.
  • Temperature – temperature increase results in weakening of induction. Check the maximum operating temperature for a given model.

* Holding force was tested on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, however under attempts to slide the magnet the load capacity is reduced by as much as 75%. In addition, even a minimal clearance {between} the magnet and the plate reduces the lifting capacity.

Precautions when working with NdFeB magnets

Handling guide

Before starting, read the rules. Sudden snapping can destroy the magnet or hurt your hand. Be predictive.

No play value

Strictly store magnets out of reach of children. Ingestion danger is significant, and the effects of magnets clamping inside the body are tragic.

Compass and GPS

A strong magnetic field disrupts the operation of magnetometers in phones and GPS navigation. Do not bring magnets close to a device to avoid damaging the sensors.

Metal Allergy

A percentage of the population suffer from a hypersensitivity to nickel, which is the standard coating for NdFeB magnets. Prolonged contact may cause skin redness. We strongly advise wear protective gloves.

Demagnetization risk

Watch the temperature. Exposing the magnet above 80 degrees Celsius will permanently weaken its magnetic structure and strength.

Warning for heart patients

Life threat: Strong magnets can turn off pacemakers and defibrillators. Do not approach if you have electronic implants.

Do not drill into magnets

Dust generated during machining of magnets is flammable. Do not drill into magnets unless you are an expert.

Beware of splinters

Despite metallic appearance, neodymium is delicate and cannot withstand shocks. Avoid impacts, as the magnet may shatter into sharp, dangerous pieces.

Safe distance

Device Safety: Neodymium magnets can damage payment cards and sensitive devices (pacemakers, hearing aids, mechanical watches).

Physical harm

Risk of injury: The pulling power is so great that it can cause blood blisters, pinching, and broken bones. Use thick gloves.

Safety First!

Looking for details? Read our article: Are neodymium magnets dangerous?

Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98