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UMP 97x40 [M8+M10] GW F300 kg / N38 - search holder

search holder

Catalog no 210337

GTIN/EAN: 5906301813965

5.00

Diameter Ø

97 mm [±1 mm]

Height

40 mm [±1 mm]

Weight

2200 g

Load capacity

380.00 kg / 3726.53 N

Coating

[NiCuNi] Nickel

Magnetic Flux

~ 10 000 Gauss [±5%]

see parameters »

300.00 ZŁ with VAT / pcs + price for transport

243.90 ZŁ net + 23% VAT / pcs

bulk discounts:

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Carbon Footprint – environmental impact GPSR Regulation – product safety
Need advice?

Pick up the phone and ask +48 888 99 98 98 otherwise send us a note using inquiry form through our site.
Force and structure of a neodymium magnet can be checked using our force calculator.

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

💡 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 97x40 [M8+M10] GW F300 kg / N38 - search holder

Specification / characteristics - UMP 97x40 [M8+M10] GW F300 kg / N38 - search holder

properties
properties values
Cat. no. 210337
GTIN/EAN 5906301813965
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 97 mm [±1 mm]
Height 40 mm [±1 mm]
Weight 2200 g
Load capacity ~ ? 380.00 kg / 3726.53 N
Coating [NiCuNi] Nickel
Holder Type 2 sided
Material Type Structural steel S235 (ferrous)
Magnetic Flux ~ 10 000 Gauss [±5%]
Size/Mount Quantity 2xM8/1xM10
Manufacturing Tolerance ±1 mm

Magnetic properties of material N38

Specification / characteristics UMP 97x40 [M8+M10] GW F300 kg / 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
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%
Sustainability
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: 210337-2026
Measurement Calculator
Pulling force
Magnetic Field
Type data in any box, to see the rest change automatically.

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The best choice are magnets in thick, chrome-plated housings dedicated to water applications. Model UMP 97x40 [M8+M10] GW F300 kg / 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. 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.
This construction protects the brittle neodymium from direct impact against stones and the bottom. 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. We often add thread glue to secure the eyelet against unscrewing in water. 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. 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.
Unlike other brands, Dhit does not cut corners on components, which translates into a better results during treasure hunting.
Consequently, despite the affordable cost, the mechanical durability of the Dhit product puts it a step above other brands.
You should know that the same mount pulled by the side hook can actually show as little as 40 kg of power instead of the promised 200 kg. Crucially, in the entire internet, there are virtually no videos testing the real side-pull force of competitor products on the side hook.
{By choosing Dhit, you support a local market leader that perfectly understands the specifics of local rivers and lakes. Don't risk it with random brands, it is better to choose proven gear that ensures the satisfaction of every user.

Pros and cons of Nd2Fe14B magnets.

Benefits

Besides their stability, neodymium magnets are valued for these benefits:
  • They virtually do not lose strength, because even after 10 years the performance loss is only ~1% (in laboratory conditions),
  • They maintain their magnetic properties even under strong external field,
  • By covering with a decorative coating of gold, the element acquires an aesthetic look,
  • Neodymium magnets deliver maximum magnetic induction on a small surface, which increases force concentration,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their shape) at temperatures up to 230°C and above...
  • Thanks to freedom in designing and the ability to customize to complex applications,
  • Significant place in electronics industry – they are used in computer drives, electric motors, medical equipment, as well as technologically advanced constructions.
  • Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Limitations

Problematic aspects of neodymium magnets and proposals for their use:
  • Brittleness is one of their disadvantages. Upon strong impact they can break. We recommend keeping them in a strong case, which not only protects them against impacts but also raises their durability
  • When exposed to high temperature, neodymium magnets suffer a drop in strength. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
  • They oxidize in a humid environment. For use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
  • We recommend cover - magnetic mechanism, due to difficulties in realizing nuts inside the magnet and complicated shapes.
  • Health risk resulting from small fragments 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 small elements of these magnets are able to complicate diagnosis 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

Maximum lifting capacity of the magnet – what affects it?

The declared magnet strength represents the peak performance, obtained under laboratory conditions, meaning:
  • with the application of a yoke made of special test steel, ensuring maximum field concentration
  • whose thickness reaches at least 10 mm
  • with a plane free of scratches
  • with total lack of distance (no impurities)
  • during detachment in a direction vertical to the plane
  • at room temperature

Lifting capacity in practice – influencing factors

In practice, the actual holding force depends on several key aspects, ranked from the most important:
  • Gap between magnet and steel – even a fraction of a millimeter of distance (caused e.g. by veneer or unevenness) diminishes the pulling force, often by half at just 0.5 mm.
  • Load vector – highest force is obtained only during pulling at a 90° angle. The resistance to sliding of the magnet along the surface is standardly several times lower (approx. 1/5 of the lifting capacity).
  • Steel thickness – insufficiently thick steel does not close the flux, causing part of the power to be lost to the other side.
  • Material composition – different alloys attracts identically. High carbon content weaken the attraction effect.
  • Plate texture – ground elements guarantee perfect abutment, which improves force. Uneven metal weaken the grip.
  • Thermal environment – temperature increase results in weakening of force. It is worth remembering the maximum operating temperature for a given model.

Lifting capacity testing was conducted on plates with a smooth surface of optimal thickness, under a perpendicular pulling force, however under shearing force the lifting capacity is smaller. Moreover, even a small distance between the magnet and the plate reduces the holding force.

Precautions when working with neodymium magnets
Fire warning

Fire hazard: Rare earth powder is explosive. Avoid machining magnets without safety gear as this risks ignition.

Cards and drives

Equipment safety: Strong magnets can damage payment cards and delicate electronics (heart implants, medical aids, mechanical watches).

Metal Allergy

Nickel alert: The nickel-copper-nickel coating contains nickel. If skin irritation happens, cease working with magnets and use protective gear.

Serious injuries

Large magnets can break fingers instantly. Do not put your hand between two strong magnets.

Eye protection

Protect your eyes. Magnets can explode upon violent connection, launching sharp fragments into the air. Wear goggles.

Do not give to children

Only for adults. Tiny parts pose a choking risk, leading to severe trauma. Store away from kids and pets.

Safe operation

Handle magnets consciously. Their huge power can surprise even experienced users. Stay alert and do not underestimate their force.

Health Danger

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

Demagnetization risk

Regular neodymium magnets (N-type) undergo demagnetization when the temperature surpasses 80°C. The loss of strength is permanent.

Magnetic interference

Navigation devices and mobile phones are highly sensitive to magnetic fields. Close proximity with a powerful NdFeB magnet can ruin the sensors in your phone.

Important! Looking for details? Check our post: Are neodymium magnets dangerous?