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UMP 79x50 [M8] GW - search holder

search holder

Catalog no 210260

GTIN/EAN: 5906301813934

Diameter Ø

79 mm [±1 mm]

Height

50 mm [±1 mm]

Weight

1.95 g

Load capacity

340.00 kg / 3334.26 N

Coating

[NiCuNi] Nickel

technical specifications »

270.00 ZŁ with VAT / pcs + price for transport

219.51 ZŁ net + 23% VAT / pcs

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Give us a call +48 22 499 98 98 if you prefer get in touch using request form the contact section.
Weight along with form of neodymium magnets can be estimated using our power calculator.

Orders placed before 14:00 will be shipped the same business day.

💡 Guide: How to choose a decent magnet and not get ripped off?

Don't be fooled by amateur online tests – go for certified quality and specific parameters that guarantee success:

  • 📏 Magnet thickness in the casing (min. 10mm) – This is what matters most! Thin magnets are weak. Thanks to the 1cm thickness of N52 neodymium, your magnet "sees" metal even through thick rust and mud.
  • 🛡️ Armored protection (Black Epoxy) – Forget about rust. This coating doesn't chip when hitting rocks and protects the magnet in water much better than regular nickel, which fails quickly.
  • 🧲 Eyelets that don't steal power – Made of special non-magnetic steel, so they don't stick to the magnet and don't block the force. Important: mount only one eyelet at a time! Using 3 at once is a mistake that weakens the magnet.
  • 🧶 Certified rope (min. 8mm) – You gain the certainty that your gear won't stay at the bottom. It's thick and comfortable, so it doesn't cut your fingers when pulling out heavy scrap metal.
  • 🚀 Our advantage: We are the only ones combining the strongest N52 neodymium (10mm thick) with non-magnetic eyelets. This is real power and durability you won't find anywhere else.

Invest in solid equipment and enjoy the results!

Technical details - UMP 79x50 [M8] GW - search holder

Specification / characteristics - UMP 79x50 [M8] GW - search holder

properties
properties values
Cat. no. 210260
GTIN/EAN 5906301813934
Production/Distribution Dhit sp. z o.o.
ul. Zielona 14 05-850 Ożarów Mazowiecki PL
Country of origin Poland / China / Germany
Customs code 85059029
Diameter Ø 79 mm [±1 mm]
Height 50 mm [±1 mm]
Weight 1.95 g
Load capacity ~ ? 340.00 kg / 3334.26 N
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±1 mm

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

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 10-6 °C-1
Thermal expansion perpendicular (⊥) to orientation (M) -(1-3) x 10-6 °C-1
Young's modulus 1.7 x 104 kg/mm²
Technical and environmental data
Chemical composition
iron (Fe) 64% – 68%
neodymium (Nd) 29% – 32%
boron (B) 1.1% – 1.2%
dysprosium (Dy) 0.5% – 2.0%
coating (Ni-Cu-Ni) < 0.05%
Ecology and recycling (GPSR)
recyclability (EoL) 100%
recycled raw materials ~10% (pre-cons)
carbon footprint low / zredukowany
waste code (EWC) 16 02 16
Safety card (GPSR)
responsible entity
Dhit sp. z o.o.
ul. Kościuszki 6A, 05-850 Ożarów Mazowiecki
tel: +48 22 499 98 98 | e-mail: bok@dhit.pl
batch number/type
id: 210260-2026
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Force (pull)
Magnetic Field
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For underwater searches, we recommend specialized holders from the GOLD series, designed for working in difficult conditions. It is equipment that can handle pulling heavy and silted objects from the river bottom. For beginners, we recommend lighter single-sided models (F80-F200), for advanced users - heavier double-sided (Two-Side) ones.
The 2xTwo-Side version is more versatile, allowing the eyelet to be mounted in two positions. The side eyelet ensures the magnet doesn't stand sideways or "on edge" during pulling. The double-sided version increases search efficiency by 100%.
The magnet is glued into a solid steel cup and sealed with epoxy resin, protecting it from water. Despite solid construction, neodymium is a brittle material and can chip upon very strong impact (e.g., against concrete). Maintenance (e.g., WD-40) prevents surface corrosion of the steel housing.
We offer both standalone holders and ready-made gift sets (depending on the selected option in the store). In the package, you will find everything needed: strong rope (e.g., 20m), gloves, and hardware. We recommend always securing the thread with glue or tightening the eyelet firmly before first use.
This force applies to perfect adherence with the entire surface to a smooth, clean steel plate with a min. thickness of 20mm. In a river, objects are often rusty, silted, or irregular in shape (e.g., pipes), which drastically reduces grip strength. Therefore, to pull objects weighing 10kg from the water, a magnet with a capacity of 200-300kg is often needed.
If you find a dangerous object (unexploded ordnance) or an antique, you have a legal obligation to report it to appropriate services (Police, conservator). We recommend familiarizing yourself with current local regulations and heritage protection laws.
By choosing Dhit GOLD mounts, you get a product of a significantly higher standard and true magnetic power for the same market price.
The GOLD series feature heavy-duty, thick-walled steel that acts as a real armor for the brittle neodymium.
Many sellers use a trick by promoting the pull force tested only on the top hook. Interestingly, in the web, it is hard to find recordings testing the real side-pull force of other brands on the side hook.
{Unlike anonymous sellers, Dhit provides full support and real service assistance, which is crucial after the purchase. Instead of risking with unknown goods, it is better to choose the market leader that cares about the happiness of every user.

Pros as well as cons of rare earth magnets.

Strengths

Besides their stability, neodymium magnets are valued for these benefits:
  • They do not lose strength, even over nearly ten years – the reduction in power is only ~1% (according to tests),
  • They are resistant to demagnetization induced by external field influence,
  • By covering with a shiny coating of gold, the element has an nice look,
  • Magnetic induction on the top side of the magnet is exceptional,
  • Thanks to resistance to high temperature, they are able to function (depending on the form) even at temperatures up to 230°C and higher...
  • In view of the option of free shaping and customization to custom solutions, neodymium magnets can be produced in a variety of forms and dimensions, which increases their versatility,
  • Huge importance in advanced technology sectors – they find application in mass storage devices, motor assemblies, precision medical tools, as well as industrial machines.
  • Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Disadvantages

Characteristics of disadvantages of neodymium magnets and proposals for their use:
  • They are prone to damage upon too strong impacts. To avoid cracks, it is worth securing magnets using a steel holder. Such protection not only shields the magnet but also increases its resistance to damage
  • NdFeB magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of strength (a factor is the shape as well as dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are very resistant to heat
  • They rust in a humid environment. For use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
  • Due to limitations in realizing nuts and complex shapes in magnets, we recommend using a housing - magnetic mount.
  • Health risk resulting from small fragments of magnets are risky, in case of ingestion, which is particularly important in the aspect of protecting the youngest. Furthermore, small components of these products are able to be problematic in diagnostics medical when they are in the body.
  • With budget limitations the cost of neodymium magnets can be a barrier,

Holding force characteristics

Breakaway strength of the magnet in ideal conditions – what affects it?

Breakaway force was defined for optimal configuration, assuming:
  • on a block made of mild steel, effectively closing the magnetic flux
  • with a cross-section no less than 10 mm
  • characterized by lack of roughness
  • without any insulating layer between the magnet and steel
  • during detachment in a direction vertical to the plane
  • at standard ambient temperature

Determinants of lifting force in real conditions

Bear in mind that the working load may be lower influenced by the following factors, in order of importance:
  • Distance (betwixt the magnet and the metal), because even a microscopic clearance (e.g. 0.5 mm) leads to a reduction in force by up to 50% (this also applies to paint, corrosion or dirt).
  • Load vector – highest force is available only during perpendicular pulling. The shear force of the magnet along the surface is usually many times smaller (approx. 1/5 of the lifting capacity).
  • Base massiveness – insufficiently thick plate causes magnetic saturation, causing part of the power to be wasted into the air.
  • Material type – the best choice is high-permeability steel. Stainless steels may attract less.
  • Plate texture – ground elements ensure maximum contact, which improves force. Uneven metal reduce efficiency.
  • Operating temperature – NdFeB sinters have a sensitivity to temperature. At higher temperatures they lose power, and at low temperatures gain strength (up to a certain limit).

Lifting capacity testing was conducted on plates with a smooth surface of optimal thickness, under a perpendicular pulling force, whereas under attempts to slide the magnet the lifting capacity is smaller. In addition, even a small distance between the magnet’s surface and the plate reduces the lifting capacity.

Safe handling of neodymium magnets
Pinching danger

Watch your fingers. Two large magnets will snap together instantly with a force of several hundred kilograms, crushing anything in their path. Be careful!

Impact on smartphones

A strong magnetic field interferes with the functioning of magnetometers in phones and GPS navigation. Do not bring magnets near a device to avoid damaging the sensors.

Demagnetization risk

Regular neodymium magnets (grade N) undergo demagnetization when the temperature goes above 80°C. Damage is permanent.

Adults only

NdFeB magnets are not suitable for play. Accidental ingestion of several magnets can lead to them attracting across intestines, which poses a severe health hazard and necessitates urgent medical intervention.

Fire risk

Mechanical processing of NdFeB material poses a fire risk. Neodymium dust reacts violently with oxygen and is difficult to extinguish.

Metal Allergy

A percentage of the population experience a hypersensitivity to nickel, which is the common plating for NdFeB magnets. Extended handling can result in an allergic reaction. We recommend use safety gloves.

Eye protection

Neodymium magnets are ceramic materials, meaning they are fragile like glass. Impact of two magnets will cause them shattering into small pieces.

Immense force

Handle magnets consciously. Their powerful strength can shock even professionals. Be vigilant and do not underestimate their power.

Electronic devices

Very strong magnetic fields can corrupt files on credit cards, hard drives, and other magnetic media. Keep a distance of min. 10 cm.

Pacemakers

Warning for patients: Strong magnetic fields affect electronics. Keep at least 30 cm distance or ask another person to handle the magnets.

Attention! More info about hazards in the article: Safety of working with magnets.