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UMP 135x40 [M10+M12] GW F 600 kg / N38 - search holder

search holder

Catalog no 210339

GTIN/EAN: 5906301813989

5.00

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

Magnetic Flux

~ 10 000 Gauss [±5%]

product parameters »

599.99 ZŁ with VAT / pcs + price for transport

487.80 ZŁ net + 23% VAT / pcs

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

Give us a call +48 22 499 98 98 if you prefer send us a note through form through our site.
Strength and form of magnetic components can be calculated on our power calculator.

Same-day processing for orders placed before 14:00.

💡 Guide: How to choose a decent magnet and not get ripped off?

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 of the product - UMP 135x40 [M10+M12] GW F 600 kg / N38 - search holder

Specification / characteristics - UMP 135x40 [M10+M12] GW F 600 kg / N38 - search holder

properties
properties values
Cat. no. 210339
GTIN/EAN 5906301813989
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%]
Size/Mount Quantity 2xM10/1xM12
Manufacturing Tolerance ±1 mm

Magnetic properties of material N38

Specification / characteristics UMP 135x40 [M10+M12] GW F 600 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
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%
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: 210339-2026
Measurement Calculator
Force (pull)
Field Strength
Simply fill in a single box, to let the calculator compute 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. This specific magnet ensures a laboratory lifting capacity of up to 680.00 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.
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). 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. A full set usually contains: magnet, polypropylene rope with appropriate strength, protective gloves, hook, and carabiner. 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. Dirt, rust, paint, and algae create a distance that weakens the magnet by even 70-80%. Therefore, to pull objects weighing 10kg from the water, a magnet with a capacity of 200-300kg is often needed.
Possessing and using a neodymium magnet to clean the bottom is generally legal, provided you are not searching for artifacts protected by law. Magnet fishing is an eco-friendly hobby if you clean the river from trash and scrap.
In contrast to many market offers, Dhit does not cut corners on materials, which translates into a clear advantage during every trip to the water.
Dhit GOLD mounts feature a robust construction that provides a true shield for the brittle neodymium.
Many distributors employ a tactic by advertising the pull force measured exclusively on the vertical mount. GOLD mounts focuses on full transparency by stating the actual capabilities of the gear, so you can be sure during real field work.
{Unlike anonymous sellers, Dhit provides full support and real service assistance, which gives peace of mind after the purchase. Don't risk it with random brands, it is better to choose the market leader that ensures the happiness of searcher.

Advantages as well as disadvantages of neodymium magnets.

Strengths

Besides their high retention, neodymium magnets are valued for these benefits:
  • Their power is durable, and after approximately ten years it drops only by ~1% (according to research),
  • Magnets perfectly defend themselves against demagnetization caused by external fields,
  • The use of an refined finish of noble metals (nickel, gold, silver) causes the element to present itself better,
  • They are known for high magnetic induction at the operating surface, making them more effective,
  • 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 precise shaping and adapting to concrete needs,
  • Key role in innovative solutions – they serve a role in data components, electric drive systems, medical equipment, and complex engineering applications.
  • Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Cons

Disadvantages of NdFeB magnets:
  • They are prone to damage upon too strong impacts. To avoid cracks, it is worth protecting magnets in a protective case. Such protection not only shields the magnet but also improves its resistance to damage
  • Neodymium magnets lose their power 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
  • Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material resistant to moisture, when using outdoors
  • We recommend cover - magnetic mount, due to difficulties in creating nuts inside the magnet and complicated forms.
  • Potential hazard related to microscopic parts of magnets are risky, when accidentally swallowed, which gains importance in the context of child health protection. It is also worth noting that small components of these magnets can complicate diagnosis medical after entering the body.
  • With large orders the cost of neodymium magnets is a challenge,

Holding force characteristics

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 application of a yoke made of special test steel, guaranteeing maximum field concentration
  • possessing a thickness of at least 10 mm to avoid saturation
  • with an ideally smooth touching surface
  • under conditions of no distance (surface-to-surface)
  • under perpendicular application of breakaway force (90-degree angle)
  • in temp. approx. 20°C

Lifting capacity in practice – influencing factors

Real force is affected by working environment parameters, mainly (from most important):
  • Gap between magnet and steel – every millimeter of separation (caused e.g. by veneer or dirt) diminishes the pulling force, often by half at just 0.5 mm.
  • Force direction – declared lifting capacity refers to pulling vertically. When slipping, the magnet holds much less (typically approx. 20-30% of nominal force).
  • Plate thickness – too thin sheet causes magnetic saturation, causing part of the power to be escaped into the air.
  • Steel type – low-carbon steel attracts best. Alloy steels lower magnetic properties and holding force.
  • Surface finish – ideal contact is obtained only on polished steel. Any scratches and bumps create air cushions, weakening the magnet.
  • Heat – NdFeB sinters have a negative temperature coefficient. At higher temperatures they lose power, and at low temperatures they can be stronger (up to a certain limit).

Lifting capacity testing was performed on a smooth plate of optimal thickness, under perpendicular forces, however under shearing force the lifting capacity is smaller. Additionally, even a minimal clearance between the magnet’s surface and the plate lowers the lifting capacity.

Precautions when working with neodymium magnets
Maximum temperature

Regular neodymium magnets (grade N) undergo demagnetization when the temperature surpasses 80°C. This process is irreversible.

Crushing force

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

Flammability

Combustion risk: Neodymium dust is highly flammable. Avoid machining magnets in home conditions as this may cause fire.

Medical implants

Patients with a ICD must keep an large gap from magnets. The magnetism can stop the functioning of the life-saving device.

Avoid contact if allergic

Medical facts indicate that nickel (standard magnet coating) is a potent allergen. If you have an allergy, refrain from direct skin contact or opt for versions in plastic housing.

Magnet fragility

Despite metallic appearance, the material is brittle and cannot withstand shocks. Avoid impacts, as the magnet may shatter into hazardous fragments.

Handling guide

Be careful. Neodymium magnets act from a long distance and snap with massive power, often faster than you can move away.

Safe distance

Equipment safety: Neodymium magnets can damage data carriers and sensitive devices (heart implants, hearing aids, timepieces).

Product not for children

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

Precision electronics

A strong magnetic field negatively affects the functioning of magnetometers in phones and navigation systems. Do not bring magnets near a device to prevent breaking the sensors.

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