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UMP 107x40 [M8+M10] GW F 400 kg / N38 - search holder

search holder

Catalog no 210338

GTIN/EAN: 5906301813972

5.00
Load capacity 480.00 kg / 4707.19 N
Diameter Ø
107 mm [±1 mm]
Height
40 mm [±1 mm]
Weight
2350 g
Coating
[NiCuNi] Nickel
Magnetic Flux
~ 10 000 Gauss [±5%]

How we measure these parameters — certificates and measurements

check specifications »

325.20 zł net / pcs

400.00 zł with VAT (23% VAT) / pcs

price for transport

bulk discounts:

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Quantity
Net
Gross
price from 1 pcs
325.20 zł
400.00 zł
price from 5 pcs
305.69 zł
376.00 zł
price from 10 pcs
286.18 zł
352.00 zł

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!

Technical - UMP 107x40 [M8+M10] GW F 400 kg / N38 - search holder

Specification / characteristics - UMP 107x40 [M8+M10] GW F 400 kg / N38 - search holder

properties
properties values
Cat. no. 210338
GTIN/EAN 5906301813972
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 107 mm [±1 mm]
Height 40 mm [±1 mm]
Weight 2350 g
Load capacity ~ ? 480.00 kg / 4707.19 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 107x40 [M8+M10] GW F 400 kg / N38 - search holder
properties values units
Remanence Br ? 12.2-12.6 kGs
Remanence Br ? 1220-1260 mT
Coercivity bHc ? 10.8-11.5 kOe
Coercivity bHc ? 860-915 kA/m
Intrinsic coercivity iHc ≥ 12 kOe
Intrinsic coercivity iHc ≥ 955 kA/m
Energy product BHmax ? 36-38 BH max MGOe
Energy product BHmax ? 287-303 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

Elemental analysis

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: 210338-2026
Measurement Calculator

Magnet pull force

Field Strength

Simply populate one field, to let the tool calculate the rest for you.

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For underwater searches, we recommend specialized holders from the GOLD series, designed for working in difficult conditions. Model UMP 107x40 [M8+M10] GW F 400 kg / N38 offers an optimal weight-to-pull force ratio, which is important for repeated throwing. For beginners, we recommend lighter single-sided models (F80-F200), for advanced users - heavier double-sided (Two-Side) ones.
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). The double-sided version increases search efficiency by 100%.
Our holders have a thick steel housing covered with an anti-corrosion layer (chrome, nickel, zinc). 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.
Most of our starter kits are complete and ready to use. We often add thread glue to secure the eyelet against unscrewing in water. Using thread glue is crucial to not lose the magnet in silt.
It is a technical parameter defining perpendicular break force, not the weight of an object in water. 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). We recommend familiarizing yourself with current local regulations and heritage protection laws.
It is the smartest investment because for the same money, you obtain a premium mount that will serve you for much longer than generic imports.
A special technology of mounting the magnet in the protective cup builds a unified structure that absorbs impacts while fishing on rough surfaces.
It is worth remembering that the same magnet pulled by the lateral point can actually show only a fraction of power instead of the declared 200 kg. Crucially, in the web, it is hard to find videos testing the actual strength of other brands on the lateral attachment.
{By choosing Dhit, you support Polish engineering that perfectly understands the specifics of our waters. Every mount is checked before delivery, which ensures that you receive equipment of the highest quality.

Advantages and disadvantages of Nd2Fe14B magnets.

Benefits

Besides their tremendous field intensity, neodymium magnets offer the following advantages:
  • They retain attractive force for almost 10 years – the loss is just ~1% (based on simulations),
  • They are extremely resistant to demagnetization induced by external field influence,
  • A magnet with a smooth silver surface is more attractive,
  • Neodymium magnets achieve maximum magnetic induction on a small area, which ensures high operational effectiveness,
  • Thanks to resistance to high temperature, they can operate (depending on the form) even at temperatures up to 230°C and higher...
  • Thanks to the option of free shaping and customization to custom projects, magnetic components can be modeled in a wide range of shapes and sizes, which amplifies use scope,
  • Wide application in high-tech industry – they are utilized in hard drives, electric drive systems, precision medical tools, as well as complex engineering applications.
  • Thanks to their power density, small magnets offer high operating force, with minimal size,

Disadvantages

What to avoid - cons of neodymium magnets and ways of using them
  • To avoid cracks upon strong impacts, we recommend using special steel holders. Such a solution protects the magnet and simultaneously increases its durability.
  • When exposed to high temperature, neodymium magnets experience a drop in force. Often, when the temperature exceeds 80°C, their power 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
  • Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material immune to moisture, in case of application outdoors
  • Due to limitations in creating threads and complicated shapes in magnets, we propose using a housing - magnetic holder.
  • Potential hazard resulting from small fragments of magnets pose a threat, if swallowed, which is particularly important in the aspect of protecting the youngest. Additionally, small components of these devices are able to complicate diagnosis medical when they are in the body.
  • Due to neodymium price, their price is higher than average,

Pull force analysis

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

Holding force of 480.00 kg is a measurement result performed under specific, ideal conditions:
  • with the contact of a sheet made of special test steel, guaranteeing maximum field concentration
  • whose thickness is min. 10 mm
  • with an ideally smooth contact surface
  • under conditions of ideal adhesion (surface-to-surface)
  • during pulling in a direction perpendicular to the mounting surface
  • at temperature room level

Lifting capacity in practice – influencing factors

Real force is affected by working environment parameters, such as (from priority):
  • Air gap (between the magnet and the plate), because even a tiny clearance (e.g. 0.5 mm) results in a decrease in lifting capacity by up to 50% (this also applies to varnish, rust or dirt).
  • Force direction – remember that the magnet holds strongest perpendicularly. Under sliding down, the holding force drops significantly, often to levels of 20-30% of the nominal value.
  • Metal thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field penetrates through instead of converting into lifting capacity.
  • Metal type – different alloys reacts the same. Alloy additives weaken the interaction with the magnet.
  • Smoothness – ideal contact is obtained only on polished steel. Rough texture create air cushions, weakening the magnet.
  • Temperature – temperature increase results in weakening of induction. Check the maximum operating temperature for a given model.

Lifting capacity testing was performed on a smooth plate of optimal thickness, under a perpendicular pulling force, however under attempts to slide the magnet the load capacity is reduced by as much as 75%. Moreover, even a small distance between the magnet and the plate reduces the holding force.

Safety rules for work with NdFeB magnets
Respect the power

Before use, check safety instructions. Uncontrolled attraction can destroy the magnet or injure your hand. Think ahead.

Keep away from computers

Avoid bringing magnets near a wallet, laptop, or screen. The magnetism can permanently damage these devices and erase data from cards.

Risk of cracking

Despite metallic appearance, neodymium is brittle and not impact-resistant. Do not hit, as the magnet may crumble into sharp, dangerous pieces.

Power loss in heat

Watch the temperature. Exposing the magnet above 80 degrees Celsius will permanently weaken its magnetic structure and pulling force.

Pacemakers

Medical warning: Neodymium magnets can turn off pacemakers and defibrillators. Stay away if you have medical devices.

Bodily injuries

Large magnets can crush fingers in a fraction of a second. Never place your hand between two attracting surfaces.

Product not for children

Neodymium magnets are not intended for children. Swallowing multiple magnets may result in them pinching intestinal walls, which constitutes a severe health hazard and requires urgent medical intervention.

Flammability

Fire warning: Rare earth powder is highly flammable. Avoid machining magnets in home conditions as this may cause fire.

Allergic reactions

A percentage of the population have a contact allergy to Ni, which is the typical protective layer for NdFeB magnets. Extended handling may cause skin redness. We suggest wear protective gloves.

GPS and phone interference

Note: neodymium magnets generate a field that confuses precision electronics. Maintain a safe distance from your phone, tablet, and GPS.

Safety First! Want to know more? Check our post: Why are neodymium magnets dangerous?