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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

bulk discounts:

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Need help making a decision?

Pick up the phone and ask +48 22 499 98 98 if you prefer send us a note via request form the contact form page.
Lifting power and appearance of a magnet can be calculated on our online calculation tool.

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!

Product card - 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
Chemical composition
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

Other products

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 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).
Double-sided holders (Two-Side) have two active magnetic surfaces and two mounting holes. 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. Avoid throwing the magnet against bridge pillars or hard obstacles. After each fishing trip, we recommend rinsing the magnet with fresh water and drying it.
We offer both standalone holders and ready-made gift sets (depending on the selected option in the store). 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%. 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. Magnet fishing is an eco-friendly hobby if you clean the river from trash and scrap.
By selecting the Dhit brand, you receive a higher quality standard and real N52 grade for the same market price.
Dhit GOLD mounts feature a robust construction that acts as a real armor for the brittle neodymium.
Many distributors use a trick by advertising the pull force tested exclusively on the top hook. Interestingly, in the entire internet, there are virtually no videos demonstrating the real side-pull force of other brands on the side hook.
{In contrast to competitors importing from China, Dhit provides expert advice and real warranty help, which gives peace of mind after the purchase. Don't risk it with random brands, it is better to choose proven gear that ensures the happiness of searcher.

Pros as well as cons of rare earth magnets.

Strengths

Apart from their strong power, neodymium magnets have these key benefits:
  • They retain attractive force for around 10 years – the loss is just ~1% (according to analyses),
  • Magnets perfectly protect themselves against demagnetization caused by foreign field sources,
  • The use of an metallic finish of noble metals (nickel, gold, silver) causes the element to be more visually attractive,
  • The surface of neodymium magnets generates a maximum magnetic field – this is one of their assets,
  • Neodymium magnets are characterized by very high magnetic induction on the magnet surface and can work (depending on the form) even at a temperature of 230°C or more...
  • Possibility of precise forming and adjusting to defined applications,
  • Universal use in advanced technology sectors – they serve a role in hard drives, electric drive systems, advanced medical instruments, and complex engineering applications.
  • Thanks to efficiency per cm³, small magnets offer high operating force, occupying minimum space,

Disadvantages

Problematic aspects of neodymium magnets and ways of using them
  • At strong impacts they can break, therefore we recommend placing them in steel cases. A metal housing provides additional protection against damage and increases the magnet's durability.
  • Neodymium magnets decrease their force 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 durability even at temperatures up to 230°C
  • Magnets exposed to a humid environment can rust. Therefore during using outdoors, we advise using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
  • Limited possibility of creating threads in the magnet and complicated shapes - recommended is casing - mounting mechanism.
  • Potential hazard resulting from small fragments of magnets can be dangerous, when accidentally swallowed, which gains importance in the context of child safety. Furthermore, tiny parts of these products can complicate diagnosis medical when they are in the body.
  • Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Holding force characteristics

Maximum lifting force for a neodymium magnet – what it depends on?

The specified lifting capacity represents the peak performance, recorded under optimal environment, specifically:
  • on a base made of mild steel, optimally conducting the magnetic field
  • possessing a massiveness of at least 10 mm to ensure full flux closure
  • with a plane perfectly flat
  • without the slightest insulating layer between the magnet and steel
  • during pulling in a direction perpendicular to the mounting surface
  • at temperature approx. 20 degrees Celsius

Lifting capacity in real conditions – factors

Bear in mind that the magnet holding will differ depending on the following factors, starting with the most relevant:
  • Space between magnet and steel – every millimeter of distance (caused e.g. by veneer or dirt) diminishes the pulling force, often by half at just 0.5 mm.
  • Force direction – 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.
  • Wall thickness – thin material does not allow full use of the magnet. Part of the magnetic field penetrates through instead of generating force.
  • Plate material – mild steel attracts best. Higher carbon content decrease magnetic properties and holding force.
  • Surface structure – the smoother and more polished the plate, the larger the contact zone and higher the lifting capacity. Unevenness creates an air distance.
  • Temperature – temperature increase results in weakening of force. It is worth remembering the maximum operating temperature for a given model.

Lifting capacity was measured with the use of a steel plate with a smooth surface of optimal thickness (min. 20 mm), under perpendicular pulling force, however under shearing force the lifting capacity is smaller. Moreover, even a minimal clearance between the magnet and the plate lowers the load capacity.

Warnings
Allergy Warning

A percentage of the population suffer from a sensitization to nickel, which is the typical protective layer for neodymium magnets. Frequent touching might lead to an allergic reaction. We recommend use safety gloves.

Precision electronics

Remember: neodymium magnets generate a field that disrupts precision electronics. Keep a separation from your mobile, device, and navigation systems.

Heat warning

Regular neodymium magnets (N-type) lose power when the temperature surpasses 80°C. This process is irreversible.

Health Danger

People with a pacemaker should maintain an large gap from magnets. The magnetism can stop the operation of the life-saving device.

This is not a toy

Only for adults. Tiny parts pose a choking risk, leading to intestinal necrosis. Store out of reach of children and animals.

Respect the power

Before starting, read the rules. Sudden snapping can break the magnet or injure your hand. Think ahead.

Magnets are brittle

Protect your eyes. Magnets can explode upon uncontrolled impact, ejecting sharp fragments into the air. Wear goggles.

Cards and drives

Intense magnetic fields can erase data on credit cards, hard drives, and other magnetic media. Maintain a gap of min. 10 cm.

Combustion hazard

Machining of NdFeB material carries a risk of fire hazard. Neodymium dust oxidizes rapidly with oxygen and is difficult to extinguish.

Bone fractures

Watch your fingers. Two powerful magnets will snap together immediately with a force of several hundred kilograms, destroying anything in their path. Exercise extreme caution!

Warning! Looking for details? Check our post: Are neodymium magnets dangerous?
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98