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UMP 107x40 [M8+M10] GW F400 Lina / N38 - search holder

search holder

Catalog no 210384

GTIN/EAN: 5906301814030

5.00

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

Magnetic Flux

~ 8 000 Gauss [±5%]

see technical data »

450.00 ZŁ with VAT / pcs + price for transport

365.85 ZŁ net + 23% VAT / pcs

bulk discounts:

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Carbon Footprint – environmental impact GPSR Regulation – product safety
Not sure about your choice?

Contact us by phone +48 22 499 98 98 or send us a note using contact form the contact page.
Specifications and structure of a neodymium magnet can be checked on our modular 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 107x40 [M8+M10] GW F400 Lina / N38 - search holder

Specification / characteristics - UMP 107x40 [M8+M10] GW F400 Lina / N38 - search holder

properties
properties values
Cat. no. 210384
GTIN/EAN 5906301814030
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 ~ 8 000 Gauss [±5%]
Rope Length 25 m
Rope Capacity ~ 1595 kg
Rope Diameter Ø 8 mm
Gloves 1 pair
Size/Mount Quantity 1xM8/2xM10
Manufacturing Tolerance ±1 mm

Magnetic properties of material N38

Specification / characteristics UMP 107x40 [M8+M10] GW F400 Lina / 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%
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: 210384-2026
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Pulling force
Magnetic Induction
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The best choice are magnets in thick, chrome-plated housings dedicated to water applications. This specific magnet ensures a laboratory lifting capacity of up to 480.00 kg, which translates into high effectiveness in water. For beginners, we recommend lighter single-sided models (F80-F200), for advanced users - heavier double-sided (Two-Side) ones.
The 2xTwo-Side version is more versatile, allowing the eyelet to be mounted in two positions. The side eyelet ensures the magnet doesn't stand sideways or "on edge" during pulling. 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.
Check the product title and description to see if you are buying just the magnet or the XL set. In the package, you will find everything needed: strong rope (e.g., 20m), gloves, and hardware. We recommend always securing the thread with glue or tightening the eyelet firmly before first use.
The capacity given in the name (e.g., 480.00 kg) is the maximum value measured in laboratory conditions. 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.
Possessing and using a neodymium magnet to clean the bottom is generally legal, provided you are not searching for artifacts protected by law. It is worth acting responsibly, cleaning up after yourself, and caring for the environment by removing fished-out scrap.
It is the smartest investment because for the identical price, you buy a premium mount that will last for much longer than budget alternatives.
Dhit GOLD mounts feature a robust construction that acts as a real armor for the brittle neodymium.
You should know that the identical mount pulled by the lateral point can actually show as little as a fraction of strength instead of the declared 200 kg. Crucially, in the entire internet, there are virtually no videos demonstrating the actual strength of competitor products on the lateral attachment.
{In contrast to competitors importing from China, Dhit provides full support and instant service assistance, which is crucial after the purchase. Don't risk it with unknown goods, it is better to choose the market leader that ensures the satisfaction of every user.

Strengths and weaknesses of rare earth magnets.

Strengths

Apart from their notable magnetic energy, neodymium magnets have these key benefits:
  • They have constant strength, and over around ten years their performance decreases symbolically – ~1% (in testing),
  • Neodymium magnets remain highly resistant to magnetic field loss caused by external interference,
  • Thanks to the reflective finish, the coating of Ni-Cu-Ni, gold, or silver-plated gives an visually attractive appearance,
  • Magnets have impressive magnetic induction on the outer layer,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
  • Possibility of individual shaping as well as optimizing to atypical applications,
  • Wide application in future technologies – they are commonly used in data components, electromotive mechanisms, medical equipment, as well as technologically advanced constructions.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in compact dimensions, which makes them useful in compact constructions

Disadvantages

Cons of neodymium magnets and proposals for their use:
  • Susceptibility to cracking is one of their disadvantages. Upon intense impact they can break. We advise keeping them in a strong case, which not only secures them against impacts but also increases their durability
  • Neodymium magnets lose their strength under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 230°C
  • Magnets exposed to a humid environment can corrode. Therefore during using outdoors, we suggest using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
  • Limited possibility of creating nuts in the magnet and complex forms - preferred is casing - mounting mechanism.
  • Health risk related to microscopic parts of magnets can be dangerous, in case of ingestion, which is particularly important in the context of child health protection. It is also worth noting that small components of these devices can disrupt the diagnostic process medical in case of swallowing.
  • High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which can limit application in large quantities

Pull force analysis

Maximum lifting force for a neodymium magnet – what affects it?

The force parameter is a measurement result executed under standard conditions:
  • using a plate made of high-permeability steel, acting as a magnetic yoke
  • possessing a thickness of min. 10 mm to ensure full flux closure
  • with an ideally smooth contact surface
  • under conditions of ideal adhesion (surface-to-surface)
  • during detachment in a direction vertical to the mounting surface
  • at temperature approx. 20 degrees Celsius

Determinants of lifting force in real conditions

Real force impacted by specific conditions, mainly (from priority):
  • Space between magnet and steel – even a fraction of a millimeter of separation (caused e.g. by varnish or unevenness) significantly weakens the magnet efficiency, often by half at just 0.5 mm.
  • Force direction – catalog parameter refers to pulling vertically. When slipping, the magnet exhibits much less (often approx. 20-30% of nominal force).
  • Element thickness – for full efficiency, the steel must be sufficiently thick. Paper-thin metal limits the attraction force (the magnet "punches through" it).
  • Material type – ideal substrate is high-permeability steel. Cast iron may generate lower lifting capacity.
  • Smoothness – ideal contact is obtained only on smooth steel. Any scratches and bumps create air cushions, weakening the magnet.
  • Thermal factor – hot environment reduces magnetic field. Exceeding the limit temperature can permanently demagnetize the magnet.

Holding force was checked on the plate surface of 20 mm thickness, when a perpendicular force was applied, in contrast under attempts to slide the magnet the holding force is lower. Moreover, even a slight gap between the magnet and the plate decreases the lifting capacity.

Warnings
Power loss in heat

Control the heat. Exposing the magnet above 80 degrees Celsius will destroy its properties and strength.

Keep away from computers

Device Safety: Strong magnets can ruin payment cards and delicate electronics (pacemakers, medical aids, timepieces).

Material brittleness

Despite the nickel coating, neodymium is delicate and cannot withstand shocks. Do not hit, as the magnet may shatter into hazardous fragments.

Warning for heart patients

Warning for patients: Strong magnetic fields disrupt medical devices. Keep at least 30 cm distance or request help to work with the magnets.

Safe operation

Handle with care. Neodymium magnets attract from a long distance and connect with huge force, often quicker than you can react.

Flammability

Powder produced during machining of magnets is combustible. Avoid drilling into magnets unless you are an expert.

Product not for children

Only for adults. Small elements can be swallowed, causing serious injuries. Keep away from kids and pets.

GPS Danger

Navigation devices and smartphones are highly susceptible to magnetism. Direct contact with a strong magnet can decalibrate the sensors in your phone.

Bodily injuries

Pinching hazard: The attraction force is so immense that it can result in hematomas, pinching, and broken bones. Use thick gloves.

Avoid contact if allergic

Medical facts indicate that the nickel plating (standard magnet coating) is a common allergen. If your skin reacts to metals, avoid touching magnets with bare hands or select versions in plastic housing.

Caution! Details about hazards in the article: Magnet Safety Guide.