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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%]

599.99 with VAT / pcs + price for transport

487.80 ZŁ net + 23% VAT / pcs

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Pick up the phone and ask +48 22 499 98 98 if you prefer let us know by means of inquiry form the contact form page.
Specifications along with shape of a neodymium magnet can be verified on our force calculator.

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

Instead of believing fairy tales on YouTube with tests on uncertified equipment, see what really determines your magnet's power:

  • 📏 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!

Physical properties - 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%
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: 210339-2026
Magnet Unit Converter
Magnet pull force

Magnetic Induction

Check out more products

It is worth betting on proven F200, F300, or F550 models from our offer, which guarantee real power. This specific magnet ensures a laboratory lifting capacity of up to 680.00 kg, which translates into high effectiveness in water. 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. The double-sided version increases search efficiency by 100%.
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. 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. 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. In a river, objects are often rusty, silted, or irregular in shape (e.g., pipes), which drastically reduces grip strength. 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 does not cut corners on materials, which translates into a clear advantage during treasure hunting.
The unique way of gluing and seating the magnet in the Dhit housing creates a solid structure that dampens shocks while working on difficult, rocky bottoms.
Many distributors use a trick by advertising the pull force tested only on the top hook. The Dhit brand guarantees honest data by stating the actual capabilities of the magnet, so you avoid disappointment during real field work.
{By choosing GOLD mounts, you support a local market leader that perfectly understands the specifics of our waters. 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 rare earth magnets.

Advantages

In addition to their long-term stability, neodymium magnets provide the following advantages:
  • They have unchanged lifting capacity, and over more than 10 years their attraction force decreases symbolically – ~1% (according to theory),
  • They have excellent resistance to magnetism drop when exposed to external fields,
  • Thanks to the elegant finish, the plating of nickel, gold-plated, or silver gives an elegant appearance,
  • The surface of neodymium magnets generates a powerful magnetic field – this is one of their assets,
  • Through (adequate) combination of ingredients, they can achieve high thermal strength, enabling functioning at temperatures reaching 230°C and above...
  • Possibility of accurate creating and modifying to specific applications,
  • Fundamental importance in modern industrial fields – they serve a role in mass storage devices, motor assemblies, medical devices, and technologically advanced constructions.
  • Thanks to their power density, small magnets offer high operating force, in miniature format,

Weaknesses

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 protects the magnet but also increases its resistance to damage
  • Neodymium magnets lose their strength under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 230°C
  • They oxidize in a humid environment. For use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
  • We recommend casing - magnetic mechanism, due to difficulties in realizing nuts inside the magnet and complex forms.
  • Possible danger to health – tiny shards of magnets can be dangerous, in case of ingestion, which gains importance in the aspect of protecting the youngest. Additionally, tiny parts of these magnets can complicate diagnosis medical in case of swallowing.
  • With mass production the cost of neodymium magnets can be a barrier,

Holding force characteristics

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

Breakaway force is the result of a measurement for ideal contact conditions, including:
  • with the use of a yoke made of special test steel, guaranteeing maximum field concentration
  • with a thickness minimum 10 mm
  • with an ground contact surface
  • under conditions of gap-free contact (surface-to-surface)
  • during pulling in a direction perpendicular to the mounting surface
  • at standard ambient temperature

Determinants of lifting force in real conditions

Holding efficiency is influenced by specific conditions, including (from priority):
  • Gap (between the magnet and the plate), as even a tiny clearance (e.g. 0.5 mm) can cause a decrease in lifting capacity by up to 50% (this also applies to varnish, rust or debris).
  • Force direction – catalog parameter refers to detachment vertically. When applying parallel force, the magnet holds much less (typically approx. 20-30% of nominal force).
  • Steel thickness – too thin steel does not close the flux, causing part of the flux to be lost into the air.
  • Material type – the best choice is pure iron steel. Hardened steels may generate lower lifting capacity.
  • Surface condition – smooth surfaces guarantee perfect abutment, which increases force. Uneven metal weaken the grip.
  • Thermal environment – heating the magnet results in weakening of induction. Check the maximum operating temperature for a given model.

Lifting capacity was measured with the use of a smooth steel plate of suitable thickness (min. 20 mm), under perpendicular detachment force, in contrast under attempts to slide the magnet the lifting capacity is smaller. Additionally, even a slight gap between the magnet and the plate decreases the holding force.

Safety rules for work with neodymium magnets
GPS Danger

Be aware: rare earth magnets produce a field that interferes with precision electronics. Maintain a separation from your phone, device, and navigation systems.

Hand protection

Mind your fingers. Two large magnets will snap together immediately with a force of several hundred kilograms, destroying anything in their path. Be careful!

Immense force

Use magnets consciously. Their powerful strength can shock even experienced users. Be vigilant and do not underestimate their power.

Do not drill into magnets

Dust created during grinding of magnets is self-igniting. Avoid drilling into magnets unless you are an expert.

Maximum temperature

Standard neodymium magnets (N-type) undergo demagnetization when the temperature surpasses 80°C. This process is irreversible.

No play value

Strictly keep magnets away from children. Choking hazard is high, and the consequences of magnets clamping inside the body are fatal.

Fragile material

Neodymium magnets are sintered ceramics, which means they are very brittle. Clashing of two magnets will cause them shattering into shards.

Magnetic media

Equipment safety: Strong magnets can ruin data carriers and delicate electronics (heart implants, medical aids, timepieces).

Medical interference

Individuals with a pacemaker must keep an large gap from magnets. The magnetic field can disrupt the functioning of the implant.

Skin irritation risks

Nickel alert: The Ni-Cu-Ni coating contains nickel. If redness appears, immediately stop handling magnets and wear gloves.

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