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UMP 94x40 [3xM10] GW F550 Silver Black / N52 - search holder

search holder

Catalog no 210490

GTIN/EAN: 5906301814146

5.00
Load capacity 650.00 kg / 6374.32 N
Diameter Ø
94 mm [±1 mm]
Height
40 mm [±1 mm]
Weight
2262 g
Magnetization Direction
↑ axial
Coating
[Epoxy] Epoxy
Magnetic Flux
~ 11 000 Gauss [±5%]

How we measure these parameters — certificates and measurements

technical parameters »

284.55 zł net / pcs

350.00 zł with VAT (23% VAT) / pcs

price for transport

bulk discounts:

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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!

Detailed specification - UMP 94x40 [3xM10] GW F550 Silver Black / N52 - search holder

Specification / characteristics - UMP 94x40 [3xM10] GW F550 Silver Black / N52 - search holder

properties
properties values
Cat. no. 210490
GTIN/EAN 5906301814146
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 94 mm [±1 mm]
Height 40 mm [±1 mm]
Weight 2262 g
Magnetization Direction ↑ axial
Load capacity ~ ? 650.00 kg / 6374.32 N
Coating [Epoxy] Epoxy
Series SilverBlack
Holder Type 2 sided
Material Type Structural steel S235 (ferrous)
Magnetic Flux ~ 11 000 Gauss [±5%]
Size/Mount Quantity 3xM10
Manufacturing Tolerance ±1 mm

Magnetic properties of material N52

Specification / characteristics UMP 94x40 [3xM10] GW F550 Silver Black / N52 - search holder
properties values units
Remanence Br ? 14.2-14.7 kGs
Remanence Br ? 1420-1470 mT
Coercivity bHc ? 10.8-12.5 kOe
Coercivity bHc ? 860-995 kA/m
Intrinsic coercivity iHc ≥ 12 kOe
Intrinsic coercivity iHc ≥ 955 kA/m
Energy product BHmax ? 48-53 BH max MGOe
Energy product BHmax ? 380-422 BH max KJ/m
Maximum working 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 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 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: 210490-2026
Measurement Calculator

Force (pull)

Magnetic Induction

Put a figure in a single slot to receive results in all other fields at once.

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It is worth betting on proven F200, F300, or F550 models from our offer, which guarantee real power. This specific magnet ensures a laboratory lifting capacity of up to 650.00 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. Single-sided magnets are usually lighter and cheaper but less effective for long throws.
Our holders have a thick steel housing covered with an anti-corrosion layer (chrome, nickel, zinc). 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.
Most of our starter kits are complete and ready to use. 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. 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. 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 a premium mount that will last for much longer than budget alternatives.
The unique way of mounting the magnet in the protective cup builds a unified structure that absorbs impacts while fishing on difficult, rocky bottoms.
Many distributors employ a tactic by promoting the power measured only on the top hook. GOLD mounts guarantees full transparency by stating the actual capabilities of the gear, so you can be sure during real field work.
{In contrast to competitors importing from China, Dhit provides full support and real warranty help, which is crucial after the transaction. Every product is checked before shipping, which ensures that you receive equipment of the highest quality.

Advantages as well as disadvantages of Nd2Fe14B magnets.

Strengths

Apart from their strong magnetism, neodymium magnets have these key benefits:
  • They retain magnetic properties for around ten years – the loss is just ~1% (based on simulations),
  • Magnets perfectly protect themselves against loss of magnetization caused by external fields,
  • A magnet with a smooth gold surface has better aesthetics,
  • Neodymium magnets generate maximum magnetic induction on a their surface, which increases force concentration,
  • Through (appropriate) combination of ingredients, they can achieve high thermal resistance, enabling functioning at temperatures reaching 230°C and above...
  • In view of the ability of accurate molding and adaptation to custom requirements, NdFeB magnets can be created in a wide range of geometric configurations, which increases their versatility,
  • Versatile presence in innovative solutions – they are commonly used in HDD drives, electromotive mechanisms, precision medical tools, as well as complex engineering applications.
  • Relatively small size with high pulling force – neodymium magnets offer high power in tiny dimensions, which makes them useful in small systems

Disadvantages

Problematic aspects of neodymium magnets and ways of using them
  • Brittleness is one of their disadvantages. Upon strong impact they can fracture. We advise keeping them in a strong case, which not only protects them against impacts but also increases their durability
  • NdFeB magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of power (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
  • Magnets exposed to a humid environment can corrode. Therefore when using outdoors, we recommend using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
  • Limited possibility of producing threads in the magnet and complex shapes - recommended is a housing - magnet mounting.
  • Health risk resulting from small fragments of magnets are risky, when accidentally swallowed, which is particularly important in the context of child safety. Additionally, small components of these products can disrupt the diagnostic process medical when they are in the body.
  • Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Lifting parameters

Optimal lifting capacity of a neodymium magnet – what contributes to it?

The load parameter shown concerns the peak performance, measured under laboratory conditions, specifically:
  • using a plate made of high-permeability steel, acting as a ideal flux conductor
  • with a cross-section no less than 10 mm
  • characterized by smoothness
  • under conditions of ideal adhesion (metal-to-metal)
  • for force applied at a right angle (pull-off, not shear)
  • at room temperature

What influences lifting capacity in practice

Effective lifting capacity impacted by working environment parameters, mainly (from most important):
  • Gap (between the magnet and the plate), because even a tiny clearance (e.g. 0.5 mm) leads to a decrease in force by up to 50% (this also applies to paint, corrosion or dirt).
  • Pull-off angle – remember that the magnet has greatest strength perpendicularly. Under shear forces, the capacity drops drastically, often to levels of 20-30% of the nominal value.
  • Substrate thickness – for full efficiency, the steel must be sufficiently thick. Paper-thin metal restricts the lifting capacity (the magnet "punches through" it).
  • Plate material – mild steel attracts best. Alloy admixtures lower magnetic properties and holding force.
  • Surface finish – full contact is obtained only on polished steel. Any scratches and bumps create air cushions, reducing force.
  • Temperature – temperature increase causes a temporary drop of induction. Check the maximum operating temperature for a given model.

Lifting capacity was assessed using a steel plate with a smooth surface of optimal thickness (min. 20 mm), under perpendicular pulling force, in contrast under shearing force the holding force is lower. In addition, even a slight gap between the magnet and the plate lowers the lifting capacity.

Safety rules for work with neodymium magnets
Power loss in heat

Regular neodymium magnets (N-type) lose power when the temperature goes above 80°C. The loss of strength is permanent.

Caution required

Use magnets with awareness. Their huge power can shock even experienced users. Stay alert and respect their power.

Serious injuries

Large magnets can break fingers instantly. Do not put your hand betwixt two attracting surfaces.

Nickel allergy

Studies show that the nickel plating (the usual finish) is a strong allergen. For allergy sufferers, refrain from direct skin contact or select coated magnets.

Magnetic interference

Remember: neodymium magnets generate a field that confuses precision electronics. Maintain a separation from your mobile, tablet, and navigation systems.

Fire risk

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

Safe distance

Avoid bringing magnets near a purse, laptop, or TV. The magnetic field can irreversibly ruin these devices and erase data from cards.

Do not give to children

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

Pacemakers

For implant holders: Strong magnetic fields affect medical devices. Keep at least 30 cm distance or ask another person to work with the magnets.

Beware of splinters

Despite the nickel coating, the material is delicate and cannot withstand shocks. Avoid impacts, as the magnet may crumble into sharp, dangerous pieces.

Warning! Learn more about hazards in the article: Magnet Safety Guide.