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UMP 65x45 [M8] GW - search holder

search holder

Catalog no 210259

GTIN/EAN: 5906301813927

Load capacity 230.00 kg / 2255.53 N
Diameter Ø
65 mm [±1 mm]
Height
45 mm [±1 mm]
Weight
1150 g
Coating
[NiCuNi] Nickel
product specifications »

121.95 zł net / pcs

150.00 zł with VAT (23% VAT) / pcs

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Frequently asked questions

How much will a magnetic holder hold in practice?
The catalogue value assumes full contact with smooth steel at least 10 mm thick and a perpendicular pull. Thinner sheet, paint, rust and surface irregularities reduce it considerably: on 1 mm sheet about half remains. Lifting and vertical mounting call for an additional safety margin.
Will a holder work on stainless steel?
Not on austenitic grades 304 and 316 — they are effectively non-magnetic. It will not work on aluminium, copper or brass either. Those materials need a mechanical gripper.
Which coating for which conditions?
Nickel-copper-nickel (NiCuNi) is the standard and covers most applications. Epoxy is used for damp environments and outdoor work, zinc is sufficient for dry interiors. Holders in a steel housing or in rubber also protect the magnet against impact.

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 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 specification - UMP 65x45 [M8] GW - search holder

Specification / characteristics - UMP 65x45 [M8] GW - search holder

properties
properties values
Cat. no. 210259
GTIN/EAN 5906301813927
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 65 mm [±1 mm]
Height 45 mm [±1 mm]
Weight 1150 g
Load capacity ~ ? 230.00 kg / 2255.53 N
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±1 mm

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
Technical specification and ecology

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%

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: 210259-2026
Magnet Unit Converter

Pulling force

Field Strength

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For underwater searches, we recommend specialized holders from the GOLD series, designed for working in difficult conditions. Model UMP 65x45 [M8] GW offers an optimal weight-to-pull force ratio, which is important for repeated throwing. 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. Single-sided magnets are usually lighter and cheaper but less effective for long throws.
The magnet is glued into a solid steel cup and sealed with epoxy resin, protecting it from water. Despite solid construction, neodymium is a brittle material and can chip upon very strong impact (e.g., against concrete). 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. We often add thread glue to secure the eyelet against unscrewing in water. 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. The magnet may slide on round elements (bicycle frame) due to the small contact area. A large power reserve is essential in real search conditions.
If you find a dangerous object (unexploded ordnance) or an antique, you have a legal obligation to report it to appropriate services (Police, conservator). It is worth acting responsibly, cleaning up after yourself, and caring for the environment by removing fished-out scrap.
By choosing the Dhit brand, you get a higher quality standard and true magnetic power for the average cost.
Dhit GOLD mounts utilize heavy-duty, thick-walled steel that acts as a real armor for the magnetic core.
You should know that the identical mount pulled by the lateral point often has only a fraction of strength instead of the declared 200 kg. GOLD mounts guarantees honest data by providing the actual capabilities of the gear, so you can be sure during real field work.
{In contrast to competitors importing from China, Dhit provides full support and real warranty help, which gives peace of mind after the purchase. Every product is individually inspected before delivery, which guarantees that you the set will be of the defect-free.

Strengths and weaknesses of rare earth magnets.

Strengths

In addition to their long-term stability, neodymium magnets provide the following advantages:
  • They retain full power for nearly 10 years – the loss is just ~1% (in theory),
  • Neodymium magnets are highly resistant to loss of magnetic properties caused by external interference,
  • Thanks to the elegant finish, the plating of nickel, gold-plated, or silver-plated gives an elegant appearance,
  • They feature high magnetic induction at the operating surface, which increases their power,
  • Thanks to resistance to high temperature, they are able to function (depending on the shape) even at temperatures up to 230°C and higher...
  • Thanks to modularity in forming and the ability to adapt to client solutions,
  • Significant place in modern industrial fields – they find application in computer drives, electromotive mechanisms, medical devices, also other advanced devices.
  • Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Disadvantages

Disadvantages of neodymium magnets:
  • At very strong impacts they can break, therefore we recommend placing them in strong housings. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • We warn that neodymium magnets can reduce their power at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 230°C.
  • They oxidize in a humid environment. For use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
  • We suggest casing - magnetic holder, due to difficulties in producing threads inside the magnet and complex shapes.
  • Possible danger related to microscopic parts of magnets can be dangerous, when accidentally swallowed, which is particularly important in the aspect of protecting the youngest. Furthermore, small components of these magnets are able to be problematic in diagnostics medical after entering the body.
  • High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which increases costs of application in large quantities

Holding force characteristics

Detachment force of the magnet in optimal conditions – what it depends on?

Information about lifting capacity was determined for the most favorable conditions, taking into account:
  • using a plate made of high-permeability steel, acting as a circuit closing element
  • possessing a thickness of at least 10 mm to ensure full flux closure
  • with a surface perfectly flat
  • with zero gap (no impurities)
  • under perpendicular force direction (90-degree angle)
  • at conditions approx. 20°C

Practical lifting capacity: influencing factors

It is worth knowing that the magnet holding may be lower subject to the following factors, starting with the most relevant:
  • Clearance – the presence of foreign body (rust, tape, air) acts as an insulator, which reduces capacity rapidly (even by 50% at 0.5 mm).
  • Pull-off angle – remember that the magnet holds strongest perpendicularly. Under sliding down, the holding force drops significantly, often to levels of 20-30% of the maximum value.
  • Wall thickness – the thinner the sheet, the weaker the hold. Magnetic flux penetrates through instead of converting into lifting capacity.
  • Plate material – mild steel attracts best. Higher carbon content reduce magnetic properties and holding force.
  • Smoothness – ideal contact is obtained only on smooth steel. Rough texture create air cushions, reducing force.
  • Thermal factor – hot environment reduces pulling force. Exceeding the limit temperature can permanently demagnetize the magnet.

Holding force was tested on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, however under parallel forces the lifting capacity is smaller. In addition, even a minimal clearance between the magnet’s surface and the plate decreases the holding force.

Safe handling of neodymium magnets
Medical implants

Individuals with a heart stimulator have to keep an absolute distance from magnets. The magnetic field can interfere with the operation of the life-saving device.

Shattering risk

NdFeB magnets are sintered ceramics, which means they are prone to chipping. Clashing of two magnets will cause them shattering into shards.

Skin irritation risks

Medical facts indicate that the nickel plating (the usual finish) is a strong allergen. For allergy sufferers, refrain from direct skin contact or select encased magnets.

Adults only

Adult use only. Small elements pose a choking risk, leading to serious injuries. Keep out of reach of kids and pets.

Fire warning

Combustion risk: Rare earth powder is explosive. Do not process magnets without safety gear as this may cause fire.

Magnetic interference

Be aware: neodymium magnets produce a field that disrupts precision electronics. Keep a safe distance from your phone, device, and navigation systems.

Permanent damage

Monitor thermal conditions. Exposing the magnet to high heat will permanently weaken its properties and strength.

Electronic devices

Very strong magnetic fields can destroy records on payment cards, hard drives, and other magnetic media. Stay away of min. 10 cm.

Caution required

Before starting, check safety instructions. Uncontrolled attraction can break the magnet or injure your hand. Be predictive.

Bodily injuries

Watch your fingers. Two large magnets will join instantly with a force of massive weight, destroying everything in their path. Be careful!

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