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UMP 135x40 [M10+M12] GW F600 Lina / N38 - search holder

search holder

Catalog no 210385

GTIN/EAN: 5906301814047

5.00
Load capacity 680.00 kg / 6668.52 N
Diameter Ø
135 mm [±1 mm]
Height
40 mm [±1 mm]
Weight
4300 g
Coating
[NiCuNi] Nickel
Magnetic Flux
~ 10 000 Gauss [±5%]

How we measure these parameters — certificates and measurements

view parameters »

528.45 zł net / pcs

649.99 zł with VAT (23% VAT) / pcs

price for transport

bulk discounts:

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Gross
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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 135x40 [M10+M12] GW F600 Lina / N38 - search holder

Specification / characteristics - UMP 135x40 [M10+M12] GW F600 Lina / N38 - search holder

properties
properties values
Cat. no. 210385
GTIN/EAN 5906301814047
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 135 mm [±1 mm]
Height 40 mm [±1 mm]
Weight 4300 g
Load capacity ~ ? 680.00 kg / 6668.52 N
Coating [NiCuNi] Nickel
Holder Type 2 sided
Material Type Structural steel S235 (ferrous)
Magnetic Flux ~ 10 000 Gauss [±5%]
Rope Length 25 m
Rope Capacity ~ 1595 kg
Rope Diameter Ø 8 mm
Gloves 1 pair
Size/Mount Quantity 3xM10
Manufacturing Tolerance ±1 mm

Magnetic properties of material N38

Specification / characteristics UMP 135x40 [M10+M12] GW F600 Lina / 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
Engineering data and GPSR

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: 210385-2026
Measurement Calculator

Force (pull)

Field Strength

Just fill in a single box, to let the tool calculate everything else automatically.

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It is worth betting on proven F200, F300, or F550 models from our offer, which guarantee real power. It is equipment that can handle pulling heavy and silted objects from the river bottom. The choice depends on whether you plan to throw from the shore (double-sided) or from a bridge (single-sided).
The 2xTwo-Side version is more versatile, allowing the eyelet to be mounted in two positions. Top mounting works well when fishing from a bridge, pier, or well (vertical technique). 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. Avoid throwing the magnet against bridge pillars or hard obstacles. 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.
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. Therefore, to pull objects weighing 10kg from the water, a magnet with a capacity of 200-300kg is often needed.
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 many market offers, Dhit uses the highest quality components, which translates into a clear advantage during treasure hunting.
Consequently, despite the market price, the lifespan of the Dhit product positions it far ahead of the competition.
Many distributors use a trick by promoting the pull force tested exclusively on the top hook. Crucially, in the web, there are virtually no recordings demonstrating the actual strength of competitor products on the side hook.
{In contrast to competitors importing from China, Dhit provides expert advice and instant service assistance, which is crucial after the transaction. Every product is checked before shipping, which ensures that you the set will be of the defect-free.

Pros and cons of Nd2Fe14B magnets.

Advantages

Besides their exceptional strength, neodymium magnets offer the following advantages:
  • They do not lose strength, even after nearly 10 years – the drop in power is only ~1% (based on measurements),
  • They possess excellent resistance to magnetism drop due to external magnetic sources,
  • In other words, due to the glossy surface of silver, the element is aesthetically pleasing,
  • They are known for high magnetic induction at the operating surface, which improves attraction properties,
  • Due to their durability and thermal resistance, neodymium magnets can operate (depending on the shape) even at high temperatures reaching 230°C or more...
  • Considering the option of flexible forming and customization to individualized needs, neodymium magnets can be manufactured in a variety of forms and dimensions, which makes them more universal,
  • Wide application in future technologies – they are utilized in mass storage devices, electric drive systems, precision medical tools, also industrial machines.
  • Compactness – despite small sizes they generate large force, making them ideal for precision applications

Weaknesses

Disadvantages of neodymium magnets:
  • They are prone to damage upon too strong impacts. To avoid cracks, it is worth securing magnets using a steel holder. Such protection not only shields the magnet but also improves its resistance to damage
  • When exposed to high temperature, neodymium magnets experience a drop in power. 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
  • Magnets exposed to a humid environment can rust. Therefore while using outdoors, we recommend using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
  • Limited possibility of making threads in the magnet and complex shapes - preferred is cover - magnet mounting.
  • Potential hazard to health – tiny shards of magnets pose a threat, if swallowed, which gains importance in the context of child health protection. Additionally, small elements of these devices can disrupt the diagnostic process medical when they are in the body.
  • Due to expensive raw materials, their price is relatively high,

Lifting parameters

Maximum lifting capacity of the magnet – what it depends on?

The lifting capacity listed is a measurement result executed under the following configuration:
  • with the use of a yoke made of low-carbon steel, guaranteeing maximum field concentration
  • with a cross-section of at least 10 mm
  • characterized by even structure
  • with direct contact (without paint)
  • for force acting at a right angle (in the magnet axis)
  • at ambient temperature room level

Impact of factors on magnetic holding capacity in practice

In practice, the actual lifting capacity results from several key aspects, presented from crucial:
  • Air gap (between the magnet and the metal), because even a very small distance (e.g. 0.5 mm) can cause a reduction in force by up to 50% (this also applies to paint, rust or debris).
  • Pull-off angle – remember that the magnet has greatest strength perpendicularly. Under sliding down, the capacity drops significantly, often to levels of 20-30% of the nominal value.
  • Base massiveness – too thin steel causes magnetic saturation, causing part of the flux to be lost to the other side.
  • Material composition – different alloys reacts the same. High carbon content worsen the interaction with the magnet.
  • Smoothness – full contact is obtained only on polished steel. Any scratches and bumps reduce the real contact area, reducing force.
  • Thermal environment – temperature increase results in weakening of induction. It is worth remembering the thermal limit for a given model.

Lifting capacity was assessed with the use of a steel plate with a smooth surface of optimal thickness (min. 20 mm), under vertically applied force, in contrast under attempts to slide the magnet the holding force is lower. Additionally, even a small distance between the magnet’s surface and the plate lowers the load capacity.

Precautions when working with NdFeB magnets
Do not underestimate power

Before use, read the rules. Sudden snapping can destroy the magnet or hurt your hand. Be predictive.

Fragile material

Beware of splinters. Magnets can explode upon violent connection, ejecting shards into the air. We recommend safety glasses.

Metal Allergy

Some people experience a contact allergy to Ni, which is the typical protective layer for NdFeB magnets. Extended handling can result in a rash. We suggest use protective gloves.

Impact on smartphones

Navigation devices and mobile phones are highly susceptible to magnetic fields. Close proximity with a strong magnet can permanently damage the internal compass in your phone.

Safe distance

Powerful magnetic fields can erase data on payment cards, hard drives, and storage devices. Keep a distance of at least 10 cm.

Medical interference

For implant holders: Powerful magnets affect medical devices. Keep at least 30 cm distance or request help to work with the magnets.

Maximum temperature

Avoid heat. Neodymium magnets are susceptible to temperature. If you need operation above 80°C, inquire about HT versions (H, SH, UH).

Choking Hazard

Adult use only. Tiny parts pose a choking risk, leading to intestinal necrosis. Store away from children and animals.

Physical harm

Big blocks can crush fingers in a fraction of a second. Never place your hand betwixt two attracting surfaces.

Dust is flammable

Combustion risk: Neodymium dust is highly flammable. Avoid machining magnets in home conditions as this risks ignition.

Caution! Details about risks in the article: Safety of working with magnets.