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UMP 50x20 [M8] GW / N38 - search holder

search holder

Catalog no 210231

GTIN/EAN: 5906301813910

5.00

Diameter Ø

50 mm [±1 mm]

Height

20 mm [±1 mm]

Weight

0.6 g

Load capacity

130.00 kg / 1274.86 N

Coating

[NiCuNi] Nickel

see parameters »

77.00 ZŁ with VAT / pcs + price for transport

62.60 ZŁ net + 23% VAT / pcs

bulk discounts:

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Carbon Footprint – environmental impact GPSR Regulation – product safety
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Contact us by phone +48 22 499 98 98 or let us know using inquiry form the contact section.
Weight as well as appearance of a magnet can be verified using our our magnetic calculator.

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💡 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 50x20 [M8] GW / N38 - search holder

Specification / characteristics - UMP 50x20 [M8] GW / N38 - search holder

properties
properties values
Cat. no. 210231
GTIN/EAN 5906301813910
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 50 mm [±1 mm]
Height 20 mm [±1 mm]
Weight 0.6 g
Load capacity ~ ? 130.00 kg / 1274.86 N
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±1 mm

Magnetic properties of material N38

Specification / characteristics UMP 50x20 [M8] GW / N38 - search holder
properties values units
remenance Br [min. - max.] ? 12.2-12.6 kGs
remenance Br [min. - max.] ? 1220-1260 mT
coercivity bHc ? 10.8-11.5 kOe
coercivity bHc ? 860-915 kA/m
actual internal force iHc ≥ 12 kOe
actual internal force iHc ≥ 955 kA/m
energy density [min. - max.] ? 36-38 BH max MGOe
energy density [min. - max.] ? 287-303 BH max KJ/m
max. temperature ? ≤ 80 °C

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
Engineering data and GPSR
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%
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: 210231-2026
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Pulling force
Magnetic Field
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For underwater searches, we recommend specialized holders from the GOLD series, designed for working in difficult conditions. Model UMP 50x20 [M8] GW / N38 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).
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. 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.
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%. 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). Magnet fishing is an eco-friendly hobby if you clean the river from trash and scrap.
In contrast to other brands, Dhit uses the highest quality components, which translates into a better results during treasure hunting.
Consequently, despite the market price, the mechanical durability of the GOLD mount positions it far ahead of the competition.
Many distributors use a trick by promoting the pull force tested only on the top hook. The Dhit brand focuses on full transparency by stating the actual capabilities of the gear, so you can be sure during treasure hunting.
{By choosing Dhit, you bet on a local market leader that knows the specifics of our waters. Every product is individually inspected before shipping, which ensures that you receive equipment of the defect-free.

Pros as well as cons of neodymium magnets.

Advantages

Apart from their strong power, neodymium magnets have these key benefits:
  • They do not lose strength, even during nearly ten years – the decrease in lifting capacity is only ~1% (according to tests),
  • Neodymium magnets are extremely resistant to loss of magnetic properties caused by magnetic disturbances,
  • A magnet with a smooth silver surface has an effective appearance,
  • The surface of neodymium magnets generates a powerful magnetic field – this is a distinguishing feature,
  • Neodymium magnets are characterized by very high magnetic induction on the magnet surface and can work (depending on the form) even at a temperature of 230°C or more...
  • Considering the option of flexible forming and customization to unique needs, magnetic components can be modeled in a wide range of forms and dimensions, which amplifies use scope,
  • Universal use in modern technologies – they are used in computer drives, electromotive mechanisms, medical devices, as well as modern systems.
  • Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in tiny dimensions, which enables their usage in miniature devices

Limitations

Disadvantages of neodymium magnets:
  • To avoid cracks under impact, we suggest using special steel housings. Such a solution secures the magnet and simultaneously increases its durability.
  • Neodymium magnets lose force when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of strength (a factor is the shape and dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are extremely resistant to heat
  • Magnets exposed to a humid environment can corrode. Therefore while using outdoors, we recommend using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
  • Limited possibility of producing nuts in the magnet and complex forms - recommended is a housing - magnetic holder.
  • Possible danger to health – tiny shards of magnets can be dangerous, in case of ingestion, which gains importance in the context of child health protection. It is also worth noting that tiny parts of these devices are able to be problematic in diagnostics medical in case of swallowing.
  • With mass production the cost of neodymium magnets is a challenge,

Pull force analysis

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

The specified lifting capacity refers to the peak performance, obtained under ideal test conditions, meaning:
  • using a sheet made of high-permeability steel, serving as a ideal flux conductor
  • whose transverse dimension equals approx. 10 mm
  • with an polished contact surface
  • under conditions of ideal adhesion (surface-to-surface)
  • under axial force direction (90-degree angle)
  • at ambient temperature approx. 20 degrees Celsius

Key elements affecting lifting force

During everyday use, the actual lifting capacity is determined by many variables, presented from the most important:
  • Distance (between the magnet and the plate), since even a tiny distance (e.g. 0.5 mm) can cause a reduction in lifting capacity by up to 50% (this also applies to varnish, rust or debris).
  • Force direction – catalog parameter refers to pulling vertically. When slipping, the magnet exhibits significantly lower power (typically approx. 20-30% of nominal force).
  • Base massiveness – too thin steel causes magnetic saturation, causing part of the flux to be lost into the air.
  • Steel grade – the best choice is high-permeability steel. Stainless steels may generate lower lifting capacity.
  • Surface quality – the more even the surface, the larger the contact zone and stronger the hold. Unevenness acts like micro-gaps.
  • Temperature influence – high temperature weakens pulling force. Exceeding the limit temperature can permanently damage the magnet.

Holding force was measured on the plate surface of 20 mm thickness, when the force acted perpendicularly, however under parallel forces the lifting capacity is smaller. Additionally, even a small distance between the magnet’s surface and the plate decreases the load capacity.

Safety rules for work with neodymium magnets
Conscious usage

Handle magnets with awareness. Their immense force can surprise even professionals. Stay alert and do not underestimate their force.

Keep away from children

Adult use only. Tiny parts can be swallowed, causing severe trauma. Store away from kids and pets.

Skin irritation risks

Nickel alert: The nickel-copper-nickel coating contains nickel. If redness appears, cease working with magnets and wear gloves.

Impact on smartphones

GPS units and smartphones are extremely susceptible to magnetic fields. Direct contact with a strong magnet can decalibrate the sensors in your phone.

Physical harm

Pinching hazard: The attraction force is so great that it can result in blood blisters, pinching, and even bone fractures. Protective gloves are recommended.

Power loss in heat

Do not overheat. NdFeB magnets are susceptible to temperature. If you need operation above 80°C, ask us about special high-temperature series (H, SH, UH).

Fire risk

Powder generated during grinding of magnets is combustible. Avoid drilling into magnets without proper cooling and knowledge.

Keep away from computers

Device Safety: Strong magnets can ruin data carriers and delicate electronics (pacemakers, medical aids, mechanical watches).

Life threat

Patients with a ICD should maintain an absolute distance from magnets. The magnetic field can stop the operation of the life-saving device.

Magnet fragility

NdFeB magnets are ceramic materials, which means they are very brittle. Collision of two magnets will cause them shattering into shards.

Security! Learn more about hazards in the article: Safety of working with magnets.