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UMP 45x25 [M8] GW / N38 - search holder

search holder

Catalog no 210602

GTIN/EAN: 5906301816058

Diameter Ø
45 mm [±1 mm]
Height
25 mm [±1 mm]
Coating
[NiCuNi] Nickel

How we measure these parameters — certificates and measurements

see parameters »

81.30 zł net / pcs

100.00 zł with VAT (23% VAT) / pcs

price for transport

bulk discounts:

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Quantity
Net
Gross
price from 1 pcs
81.30 zł
100.00 zł
price from 20 pcs
76.42 zł
94.00 zł
price from 40 pcs
71.54 zł
88.00 zł

Frequently asked questions

What rope length is best for deeper water?
Choose the length for the site and the retrieval method rather than the magnet's nominal pull rating. Allow for abrasion at the bank and check the rope, knot and attachment point as a complete set.
Where should I buy a fishing magnet, and what should I check?
Look for a product card stating the magnet grade, measured pull force and test conditions. Compare the ratings of the rope and connectors too; a large number in the magnet's name does not describe the capacity of the entire set.
What pull rating is suitable for magnet fishing in a river?
In a river, contact angle, surface condition and water movement affect the grip. All F-series models are double-sided. Compare vertical and side pull for the specific model; double-sided does not mean 360°.
Can I buy a complete starter set for magnet fishing?
Check whether the selected offer includes the magnet, rope and connectors, and whether each component has suitable specifications. Follow local safety rules and use protective equipment appropriate for the site.
Which rope can be paired with a magnet rated at several hundred kilograms?
Check the rated capacity of every component: rope, knot, shackle and eyelet. The weakest component limits the set. F200 GOLD has approximately 250 kg vertical pull and 38 kg side pull. Rope sets normally include a blue rope from a Polish manufacturer, 8 mm in diameter and 25 m long. Diameter alone does not determine rope strength.
How is a fishing magnet different from an ordinary magnetic holder?
Fishing holders provide attachment points for an eyelet and rope. All F-series models have magnets on both faces and both faces attract metal. Check the threads, coating and operating conditions of the specific model.
Will the rope be the first component to fail with a heavy find?
Not necessarily. The knot, shackle, thread or magnetic contact may limit the set first. Compare the ratings of all components and remember that an angled pull can detach the magnet before the rope reaches its rated load.
What should I look for in a shop selling fishing magnets?
Check availability, detailed product specifications, test conditions for pull force and the possibility of buying replacement accessories. Compare the whole set rather than just its advertised maximum pull force.
What does F mean in a model name? Does F200 mean a 200 kg pull rating?
F is a model designation, not a pull rating. Confirmed values: F200 SILVER N38 — approximately 230 kg vertically; F200 GOLD N42 — approximately 250 kg vertically and 38 kg laterally; F200 PLATINIUM N52 — 310 kg vertically and approximately 61 kg laterally; new F300 — 330 / 58 kg; old F300 — approximately 360 / 64 kg; F200 GOLD DUAL — approximately 610 / 76–82 kg. The old F600 with a top M12 eyelet and side M10 threads has approximately 650 kg vertical pull. No unmeasured lateral value is presented as a product specification for SILVER. Contact conditions affect the actual grip.

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.

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💡 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 dimensions and grade – Compare the specifications of the exact model in the technical table. Thickness, material grade and geometry all affect holding force and field reach.
  • 🛡️ Protective coating – Check the coating specified for the product and match it to the working environment. Water, impacts and scratches can shorten the life of an inadequately protected magnet.
  • 🧲 Mounting and force direction – The mounting method affects the actual force of the assembly. Use components intended for the specific model and follow the recommendations on its product page.
  • 🧶 Accessory selection – If the product is used with a rope, shackle or hook, check the load rating of every component. The weakest component determines the safety of the complete assembly.
  • 🚀 Choose using comparable data: Each product page lists the magnet grade, dimensions, coating and measured holding force. Compare models using the same parameters and test conditions.

Invest in solid equipment and enjoy the results!

Technical details - UMP 45x25 [M8] GW / N38 - search holder

Specification / characteristics - UMP 45x25 [M8] GW / N38 - search holder

properties
properties values
Cat. no. 210602
GTIN/EAN 5906301816058
Distributor Dhit sp. z o.o.
Country of origin Poland / China / Germany
Customs code 85059029
Diameter Ø 45 mm [±1 mm]
Height 25 mm [±1 mm]
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±1 mm

Magnetic properties of material N38

Specification / characteristics UMP 45x25 [M8] GW / 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%

Sustainability

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: 210602-2026
Magnet Unit Converter

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All F-series holders have magnets on both faces and both faces attract metal. Choose by weight and retrieval method. F200 SILVER N38: approximately 250 kg vertical pull. F200 GOLD N42: approximately 250 kg vertical pull and 38 kg side pull. F200 PLATINIUM N52: 330 kg vertical pull and approximately 61 kg side pull. No unmeasured lateral value is presented as a product specification for SILVER. The laboratory pull rating is not the weight of any object recoverable from water.
All F models are double-sided. DUAL means two connected F200 holders: approximately 610 kg vertical pull and 76–82 kg side pull. Use a side eyelet for dragging and a top eyelet for vertical retrieval. The new F300 has M10 threads throughout; the old F300 has a top M10 thread and side M8 threads. Double-sided does not mean 360°.
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.
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. Using thread glue is crucial to not lose the magnet in silt.
The capacity given in the name (e.g., 0.00 kg) is the maximum value measured in laboratory conditions. 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.
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.
Unlike other brands, Dhit does not cut corners on materials, which translates into a clear advantage during every trip to the water.
The unique way of gluing and seating the magnet in the Dhit housing builds a unified structure that absorbs impacts while working on difficult, rocky bottoms.
Many sellers use a trick by advertising the power tested only on the vertical mount. Interestingly, in the entire internet, it is hard to find recordings testing the actual strength of other brands on the side hook.
GOLD search mounts are available in several variants for different conditions. Compare the dimensions, mounting points and pull forces in the product cards before choosing a model.

Strengths as well as weaknesses of Nd2Fe14B magnets.

Strengths

Apart from their strong power, neodymium magnets have these key benefits:
  • They do not lose power, even after around ten years – the drop in strength is only ~1% (based on measurements),
  • They have excellent resistance to weakening of magnetic properties due to external magnetic sources,
  • By using a reflective layer of nickel, the element presents an modern look,
  • They show high magnetic induction at the operating surface, making them more effective,
  • Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the shape) even at high temperatures reaching 230°C or more...
  • In view of the possibility of free forming and customization to individualized solutions, magnetic components can be produced in a broad palette of geometric configurations, which expands the range of possible applications,
  • Universal use in future technologies – they are utilized in mass storage devices, motor assemblies, precision medical tools, and technologically advanced constructions.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in small dimensions, which enables their usage in miniature devices

Weaknesses

Disadvantages of neodymium magnets:
  • They are fragile upon too strong impacts. To avoid cracks, it is worth securing magnets in a protective case. Such protection not only shields the magnet but also improves its resistance to damage
  • Do not exceed this material temperature limit: 80°C. Overheating may permanently weaken the magnet.
  • Magnets exposed to a humid environment can corrode. Therefore when using outdoors, we advise using waterproof magnets made of rubber, plastic or other material resistant to moisture
  • Limited possibility of creating threads in the magnet and complex shapes - preferred is a housing - magnet mounting.
  • Potential hazard related to microscopic parts of magnets pose a threat, when accidentally swallowed, which gains importance in the context of child health protection. Additionally, tiny parts of these products are able to disrupt the diagnostic process medical in case of swallowing.
  • Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Holding force characteristics

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

Magnet power is the result of a measurement for optimal configuration, including:
  • with the application of a yoke made of special test steel, ensuring maximum field concentration
  • possessing a thickness of at least 10 mm to avoid saturation
  • with an polished contact surface
  • under conditions of no distance (metal-to-metal)
  • under vertical force vector (90-degree angle)
  • in stable room temperature

Determinants of practical lifting force of a magnet

During everyday use, the actual lifting capacity depends on many variables, listed from most significant:
  • Gap between magnet and steel – even a fraction of a millimeter of distance (caused e.g. by veneer or dirt) drastically reduces the magnet efficiency, often by half at just 0.5 mm.
  • Force direction – declared lifting capacity refers to pulling vertically. When slipping, the magnet exhibits much less (often approx. 20-30% of maximum force).
  • Base massiveness – too thin plate does not accept the full field, causing part of the flux to be wasted to the other side.
  • Steel grade – the best choice is pure iron steel. Stainless steels may have worse magnetic properties.
  • Base smoothness – the smoother and more polished the plate, the better the adhesion and higher the lifting capacity. Roughness creates an air distance.
  • Thermal factor – high temperature weakens magnetic field. Too high temperature can permanently demagnetize the magnet.

Lifting capacity was determined with the use of a polished steel plate of suitable thickness (min. 20 mm), under perpendicular detachment force, whereas under attempts to slide the magnet the lifting capacity is smaller. Additionally, even a minimal clearance between the magnet’s surface and the plate lowers the holding force.

Precautions when working with NdFeB magnets
Shattering risk

Beware of splinters. Magnets can fracture upon uncontrolled impact, ejecting shards into the air. We recommend safety glasses.

Danger to pacemakers

People with a pacemaker have to keep an safe separation from magnets. The magnetic field can disrupt the functioning of the implant.

Maximum temperature

Do not exceed the maximum operating temperature stated in the specifications of the particular product. The limit depends on the material, geometry and operating arrangement; there is no single threshold for all neodymium magnets. Overheating can permanently weaken a magnet.

Serious injuries

Big blocks can crush fingers instantly. Never put your hand betwixt two strong magnets.

Immense force

Handle magnets consciously. Their huge power can shock even experienced users. Plan your moves and respect their power.

Threat to navigation

Be aware: neodymium magnets produce a field that disrupts precision electronics. Maintain a safe distance from your mobile, tablet, and navigation systems.

Fire risk

Powder created during machining of magnets is flammable. Avoid drilling into magnets without proper cooling and knowledge.

Danger to the youngest

NdFeB magnets are not toys. Swallowing several magnets may result in them attracting across intestines, which poses a direct threat to life and requires immediate surgery.

Keep away from computers

Equipment safety: Strong magnets can damage data carriers and delicate electronics (pacemakers, medical aids, timepieces).

Warning for allergy sufferers

A percentage of the population have a hypersensitivity to nickel, which is the common plating for neodymium magnets. Prolonged contact may cause skin redness. We recommend use safety gloves.

Warning! Learn more about hazards in the article: Magnet Safety Guide.