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UMP 79x50 [M8] GW - search holder

search holder

Catalog no 210260

GTIN/EAN: 5906301813934

Load capacity 340.00 kg / 3334.26 N
Diameter Ø
79 mm [±1 mm]
Height
50 mm [±1 mm]
Weight
1.95 g
Coating
[NiCuNi] Nickel

How we measure these parameters — certificates and measurements

see specifications »

219.51 zł net / pcs

270.00 zł with VAT (23% VAT) / pcs

price for transport

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Frequently asked questions

How strong a magnet do I need for magnet fishing?
Our search magnets are rated between 32 kg and 680 kg of pull force. The rating is measured as a straight, perpendicular pull on thick, clean steel — in a river you almost never pull that way, so treat it as a figure for comparing models rather than a promise. For a first magnet, mid-range models around 300 kg are easier to handle than the heaviest ones, which are simply hard to lift once they grab a submerged object.
What rope and shackle should I pair with the magnet?
Match the whole chain, not just the magnet. Our ø10 mm rope is rated at 1592 kg and the M10 shackle at 320 kg, so with a 310 kg magnet the shackle is the limiting part. Whatever you buy, check the rating of every component separately and take the lowest one as the rating of the set. The knot at the eye is usually weaker than the rope itself.
What is the difference between a single-sided and a double-sided fishing magnet?
A single-sided magnet holds on one face only, so it has to land the right way round. A double-sided one grabs from either face, which matters when you throw it into moving water and cannot control how it lands. The trade-off is weight and price for the same nominal pull force — the F200 GOLD DUAL, for instance, is rated at 601 kg against 310 kg for the single-sided F200 GOLD.
Does the pull force rating apply underwater?
Water itself is not the problem — it is not magnetic and barely changes the force. What changes it is everything else: silt and rust between the magnet and the find, a curved or thin surface instead of a flat plate, and a pull that comes at an angle rather than straight off. Expect a fraction of the catalogue figure in real conditions, and choose the mounting point and coating with that in mind.

Guides from the knowledge base

Want to talk magnets?

Call us now +48 888 99 98 98 alternatively let us know using contact form the contact section.
Specifications and structure of a neodymium magnet can be estimated using our power calculator.

Order by 14:00 and we’ll ship today!

💡 Check why professionals choose Dhit over cheap substitutes

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!

Physical properties - 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 310 °C
Curie Temperature TF 590 °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 specification and ecology

Material specification

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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For underwater searches, we recommend specialized holders from the GOLD series, designed for working in difficult conditions. Model UMP 79x50 [M8] GW offers an optimal weight-to-pull force ratio, which is important for repeated throwing. The choice depends on whether you plan to throw from the shore (double-sided) or from a bridge (single-sided).
Double-sided holders (Two-Side) have two active magnetic surfaces and two mounting holes. 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. Despite solid construction, neodymium is a brittle material and can chip upon very strong impact (e.g., against concrete). After each fishing trip, we recommend rinsing the magnet with fresh water and drying it.
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. Using thread glue is crucial to not lose the magnet in silt.
The capacity given in the name (e.g., 340.00 kg) is the maximum value measured in laboratory conditions. 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.
If you find a dangerous object (unexploded ordnance) or an antique, you have a legal obligation to report it to appropriate services (Police, conservator). It is worth acting responsibly, cleaning up after yourself, and caring for the environment by removing fished-out scrap.
It is the best value because for the same money, you obtain professional-grade equipment that will last for many seasons than generic imports.
Dhit GOLD mounts utilize heavy-duty, thick-walled steel that acts as a real armor for the magnetic core.
Many distributors employ a tactic by promoting the pull force measured exclusively on the vertical mount. GOLD mounts guarantees honest data by providing the real parameters of the magnet, so you can be sure during real field work.
{By choosing GOLD mounts, you bet on Polish engineering that perfectly understands the conditions of our waters. Instead of risking with random brands, stick with the market leader that ensures the satisfaction of searcher.

Strengths and weaknesses of neodymium magnets.

Pros

In addition to their pulling strength, neodymium magnets provide the following advantages:
  • They retain attractive force for nearly 10 years – the loss is just ~1% (according to analyses),
  • They maintain their magnetic properties even under strong external field,
  • By covering with a reflective layer of silver, the element has an modern look,
  • The surface of neodymium magnets generates a unique magnetic field – this is a distinguishing feature,
  • Neodymium magnets are characterized by very high magnetic induction on the magnet surface and are able to act (depending on the form) even at a temperature of 230°C or more...
  • Thanks to flexibility in shaping and the ability to customize to unusual requirements,
  • Key role in high-tech industry – they serve a role in mass storage devices, brushless drives, precision medical tools, as well as industrial machines.
  • Thanks to efficiency per cm³, small magnets offer high operating force, in miniature format,

Disadvantages

Characteristics of disadvantages of neodymium magnets and proposals for their use:
  • They are fragile 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 improves its resistance to damage
  • 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 stability even at temperatures up to 230°C
  • When exposed to humidity, magnets usually rust. For applications outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which secure oxidation as well as corrosion.
  • Due to limitations in creating nuts and complex forms in magnets, we propose using a housing - magnetic mount.
  • Possible danger resulting from small fragments of magnets are risky, if swallowed, which becomes key in the aspect of protecting the youngest. Additionally, tiny parts of these devices can complicate diagnosis medical after entering the body.
  • High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which can limit application in large quantities

Holding force characteristics

Maximum lifting force for a neodymium magnet – what affects it?

Holding force of 340.00 kg is a measurement result executed under the following configuration:
  • on a plate made of mild steel, effectively closing the magnetic field
  • whose transverse dimension is min. 10 mm
  • with a surface perfectly flat
  • with zero gap (without paint)
  • for force applied at a right angle (in the magnet axis)
  • at conditions approx. 20°C

Practical lifting capacity: influencing factors

Real force is influenced by specific conditions, mainly (from most important):
  • Air gap (between the magnet and the plate), as even a tiny clearance (e.g. 0.5 mm) leads to a reduction in force by up to 50% (this also applies to paint, rust or dirt).
  • Pull-off angle – note that the magnet holds strongest perpendicularly. Under sliding down, the capacity drops significantly, often to levels of 20-30% of the nominal value.
  • Wall thickness – thin material does not allow full use of the magnet. Part of the magnetic field passes through the material instead of converting into lifting capacity.
  • Material type – the best choice is pure iron steel. Stainless steels may have worse magnetic properties.
  • Surface condition – ground elements guarantee perfect abutment, which increases force. Uneven metal reduce efficiency.
  • Temperature – heating the magnet results in weakening of induction. It is worth remembering the maximum operating temperature for a given model.

Lifting capacity testing was carried out on plates with a smooth surface of suitable thickness, under a perpendicular pulling force, in contrast under attempts to slide the magnet the lifting capacity is smaller. Additionally, even a slight gap between the magnet’s surface and the plate lowers the lifting capacity.

Warnings
Maximum temperature

Watch the temperature. Heating the magnet above 80 degrees Celsius will permanently weaken its properties and strength.

Choking Hazard

These products are not suitable for play. Swallowing multiple magnets can lead to them pinching intestinal walls, which poses a direct threat to life and necessitates immediate surgery.

Phone sensors

Be aware: rare earth magnets generate a field that interferes with sensitive sensors. Maintain a separation from your phone, tablet, and navigation systems.

Machining danger

Powder produced during machining of magnets is combustible. Avoid drilling into magnets unless you are an expert.

Avoid contact if allergic

Medical facts indicate that the nickel plating (standard magnet coating) is a common allergen. If your skin reacts to metals, avoid touching magnets with bare hands or select coated magnets.

Danger to pacemakers

Medical warning: Strong magnets can deactivate pacemakers and defibrillators. Do not approach if you have medical devices.

Magnetic media

Device Safety: Neodymium magnets can damage data carriers and sensitive devices (pacemakers, medical aids, mechanical watches).

Serious injuries

Protect your hands. Two large magnets will snap together immediately with a force of several hundred kilograms, destroying everything in their path. Exercise extreme caution!

Eye protection

NdFeB magnets are sintered ceramics, meaning they are very brittle. Impact of two magnets leads to them shattering into small pieces.

Respect the power

Be careful. Neodymium magnets attract from a distance and snap with massive power, often faster than you can move away.

Attention! Learn more about risks in the article: Safety of working with magnets.