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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

check parameters »

270.00 ZŁ with VAT / pcs + price for transport

219.51 ZŁ net + 23% VAT / pcs

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Carbon Footprint – environmental impact GPSR Regulation – product safety
Can't decide what to choose?

Call us +48 22 499 98 98 or contact us via our online form the contact section.
Strength as well as structure of magnets can be analyzed on our online calculation tool.

Same-day shipping for orders placed before 14:00.

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

Instead of believing fairy tales on YouTube with tests on uncertified equipment, see what really determines your magnet's power:

  • 📏 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 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 specification and ecology
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%
Environmental data
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. This specific magnet ensures a laboratory lifting capacity of up to 340.00 kg, which translates into high effectiveness in water. 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. 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. 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. A full set usually contains: magnet, polypropylene rope with appropriate strength, protective gloves, hook, and carabiner. 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. Dirt, rust, paint, and algae create a distance that weakens the magnet by even 70-80%. Therefore, to pull objects weighing 10kg from the water, a magnet with a capacity of 200-300kg is often needed.
Searches are allowed as long as you do not interfere with archaeological sites or search for weapons. Magnet fishing is an eco-friendly hobby if you clean the river from trash and scrap.
It is the smartest investment because for the same money, you buy a premium mount that will last for much longer than generic imports.
The GOLD series feature heavy-duty, thick-walled steel that provides a true shield for the brittle neodymium.
It is worth remembering that the same magnet used by the side hook can actually show only 40 kg of power instead of the promised 200 kg. GOLD mounts guarantees honest data by stating the actual capabilities of the magnet, so you can be sure during treasure hunting.
{By choosing GOLD mounts, you bet on Polish engineering that knows the conditions of our waters. Instead of risking with unknown goods, stick with proven gear that ensures the happiness of searcher.

Strengths and weaknesses of neodymium magnets.

Strengths

In addition to their pulling strength, neodymium magnets provide the following advantages:
  • Their strength remains stable, and after around 10 years it decreases only by ~1% (according to research),
  • They feature excellent resistance to weakening of magnetic properties due to external magnetic sources,
  • The use of an refined finish of noble metals (nickel, gold, silver) causes the element to be more visually attractive,
  • The surface of neodymium magnets generates a strong magnetic field – this is a key feature,
  • Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the shape) even at high temperatures reaching 230°C or more...
  • Possibility of accurate forming and modifying to atypical needs,
  • Key role in innovative solutions – they are utilized in magnetic memories, motor assemblies, medical devices, and other advanced devices.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in compact dimensions, which makes them useful in small systems

Disadvantages

Cons of neodymium magnets: application proposals
  • At strong impacts they can crack, therefore we recommend placing them in special holders. A metal housing provides additional protection against damage and increases the magnet's durability.
  • Neodymium magnets decrease their force under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures up to 230°C
  • Magnets exposed to a humid environment can corrode. Therefore when using outdoors, we advise using waterproof magnets made of rubber, plastic or other material protecting against moisture
  • Limited ability of creating threads in the magnet and complex forms - preferred is a housing - mounting mechanism.
  • Possible danger related to microscopic parts of magnets are risky, in case of ingestion, which becomes key in the context of child health protection. Additionally, tiny parts of these devices are able to complicate diagnosis medical in case of swallowing.
  • High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which hinders application in large quantities

Holding force characteristics

Best holding force of the magnet in ideal parameters – what contributes to it?

Magnet power was determined for ideal contact conditions, taking into account:
  • with the use of a yoke made of special test steel, ensuring maximum field concentration
  • whose transverse dimension reaches at least 10 mm
  • characterized by lack of roughness
  • under conditions of no distance (metal-to-metal)
  • under axial force direction (90-degree angle)
  • at room temperature

Lifting capacity in real conditions – factors

Bear in mind that the application force will differ depending on elements below, in order of importance:
  • Distance – existence of foreign body (paint, tape, gap) acts as an insulator, which reduces capacity steeply (even by 50% at 0.5 mm).
  • Force direction – declared lifting capacity refers to detachment vertically. When attempting to slide, the magnet holds significantly lower power (typically approx. 20-30% of maximum force).
  • Wall thickness – the thinner the sheet, the weaker the hold. Magnetic flux penetrates through instead of converting into lifting capacity.
  • Metal type – different alloys reacts the same. Alloy additives weaken the interaction with the magnet.
  • Plate texture – smooth surfaces ensure maximum contact, which improves force. Uneven metal weaken the grip.
  • Heat – NdFeB sinters have a negative temperature coefficient. At higher temperatures they lose power, and at low temperatures gain strength (up to a certain limit).

Lifting capacity was measured with the use of a steel plate with a smooth surface of suitable thickness (min. 20 mm), under perpendicular pulling force, in contrast under shearing force the load capacity is reduced by as much as 5 times. Moreover, even a slight gap between the magnet and the plate lowers the load capacity.

Precautions when working with NdFeB magnets
Machining danger

Mechanical processing of NdFeB material poses a fire hazard. Magnetic powder reacts violently with oxygen and is hard to extinguish.

Maximum temperature

Watch the temperature. Heating the magnet above 80 degrees Celsius will destroy its magnetic structure and strength.

Medical interference

People with a heart stimulator have to maintain an large gap from magnets. The magnetism can disrupt the operation of the life-saving device.

Safe operation

Use magnets with awareness. Their huge power can shock even experienced users. Be vigilant and do not underestimate their force.

Skin irritation risks

Studies show that the nickel plating (the usual finish) is a potent allergen. For allergy sufferers, prevent direct skin contact and choose coated magnets.

GPS and phone interference

A strong magnetic field interferes with the functioning of compasses in phones and navigation systems. Keep magnets close to a smartphone to prevent damaging the sensors.

Protective goggles

Protect your eyes. Magnets can fracture upon uncontrolled impact, launching shards into the air. We recommend safety glasses.

Keep away from computers

Device Safety: Strong magnets can ruin payment cards and sensitive devices (pacemakers, medical aids, timepieces).

Bone fractures

Big blocks can break fingers instantly. Never put your hand betwixt two strong magnets.

Choking Hazard

Strictly keep magnets away from children. Ingestion danger is significant, and the effects of magnets clamping inside the body are very dangerous.

Attention! Need more info? Check our post: Why are neodymium magnets dangerous?