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UMP 97x40 [M8+M10] GW F300 kg / N38 - search holder

search holder

Catalog no 210337

GTIN/EAN: 5906301813965

5.00

Diameter Ø

97 mm [±1 mm]

Height

40 mm [±1 mm]

Weight

2200 g

Load capacity

380.00 kg / 3726.53 N

Coating

[NiCuNi] Nickel

Magnetic Flux

~ 10 000 Gauss [±5%]

technical parameters »

300.00 ZŁ with VAT / pcs + price for transport

243.90 ZŁ net + 23% VAT / pcs

bulk discounts:

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Call us +48 888 99 98 98 otherwise contact us via inquiry form the contact page.
Weight and appearance of a neodymium magnet can be estimated with our our magnetic calculator.

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

💡 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!

Product card - UMP 97x40 [M8+M10] GW F300 kg / N38 - search holder

Specification / characteristics - UMP 97x40 [M8+M10] GW F300 kg / N38 - search holder

properties
properties values
Cat. no. 210337
GTIN/EAN 5906301813965
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 97 mm [±1 mm]
Height 40 mm [±1 mm]
Weight 2200 g
Load capacity ~ ? 380.00 kg / 3726.53 N
Coating [NiCuNi] Nickel
Holder Type 2 sided
Material Type Structural steel S235 (ferrous)
Magnetic Flux ~ 10 000 Gauss [±5%]
Size/Mount Quantity 2xM8/1xM10
Manufacturing Tolerance ±1 mm

Magnetic properties of material N38

Specification / characteristics UMP 97x40 [M8+M10] GW F300 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
Technical and environmental data
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%
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: 210337-2026
Measurement Calculator
Magnet pull force
Magnetic Induction
Input data into a field, and the rest change automatically.

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For underwater searches, we recommend specialized holders from the GOLD series, designed for working in difficult conditions. Model UMP 97x40 [M8+M10] GW F300 kg / N38 offers an optimal weight-to-pull force ratio, which is important for repeated throwing. For beginners, we recommend lighter single-sided models (F80-F200), for advanced users - heavier double-sided (Two-Side) ones.
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%.
Our holders have a thick steel housing covered with an anti-corrosion layer (chrome, nickel, zinc). The housing significantly increases lifespan but does not make the magnet completely indestructible. 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. 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.
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.
Searches are allowed as long as you do not interfere with archaeological sites or search for weapons. We recommend familiarizing yourself with current local regulations and heritage protection laws.
In contrast to many market offers, Dhit uses the highest quality components, which translates into a better results during treasure hunting.
As a result, despite the market price, the mechanical durability of the GOLD mount positions it a step above other brands.
It is worth remembering that the identical mount used by the side hook can actually show only 40 kg of strength instead of the promised 200 kg. GOLD mounts focuses on full transparency by stating the real parameters of the gear, so you can be sure during treasure hunting.
{By choosing GOLD mounts, you support Polish engineering that perfectly understands the conditions of our waters. Every product is individually inspected before shipping, which ensures that you the set will be of the highest quality.

Advantages as well as disadvantages of rare earth magnets.

Benefits

Besides their durability, neodymium magnets are valued for these benefits:
  • They retain magnetic properties for around ten years – the drop is just ~1% (according to analyses),
  • Neodymium magnets are remarkably resistant to loss of magnetic properties caused by external field sources,
  • In other words, due to the aesthetic surface of silver, the element becomes visually attractive,
  • Neodymium magnets achieve maximum magnetic induction on a small area, which ensures high operational effectiveness,
  • Neodymium magnets are characterized by very high magnetic induction on the magnet surface and can function (depending on the form) even at a temperature of 230°C or more...
  • Thanks to freedom in shaping and the ability to customize to unusual requirements,
  • Significant place in modern industrial fields – they are used in data components, brushless drives, precision medical tools, also complex engineering applications.
  • Relatively small size with high pulling force – neodymium magnets offer high power in tiny dimensions, which allows their use in compact constructions

Cons

Drawbacks and weaknesses of neodymium magnets: tips and applications.
  • They are prone to damage upon too strong impacts. To avoid cracks, it is worth securing magnets in a protective case. Such protection not only protects the magnet but also increases its resistance to damage
  • We warn that neodymium magnets can lose their strength at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
  • Magnets exposed to a humid environment can rust. Therefore when using outdoors, we advise using waterproof magnets made of rubber, plastic or other material protecting against moisture
  • We recommend a housing - magnetic mount, due to difficulties in producing nuts inside the magnet and complex forms.
  • Health risk related to microscopic parts of magnets pose a threat, when accidentally swallowed, which gains importance in the context of child safety. Additionally, small components of these products can complicate diagnosis medical when they are in the body.
  • High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which can limit application in large quantities

Lifting parameters

Optimal lifting capacity of a neodymium magnet – what affects it?

The specified lifting capacity represents the peak performance, obtained under optimal environment, specifically:
  • using a base made of mild steel, serving as a circuit closing element
  • possessing a thickness of min. 10 mm to avoid saturation
  • with an polished contact surface
  • without the slightest clearance between the magnet and steel
  • during pulling in a direction perpendicular to the plane
  • at standard ambient temperature

Determinants of practical lifting force of a magnet

Please note that the application force will differ influenced by elements below, starting with the most relevant:
  • Space between surfaces – every millimeter of separation (caused e.g. by veneer or dirt) significantly weakens the pulling force, often by half at just 0.5 mm.
  • Load vector – highest force is available only during pulling at a 90° angle. The shear force of the magnet along the plate is standardly many times lower (approx. 1/5 of the lifting capacity).
  • Steel thickness – insufficiently thick steel does not accept the full field, causing part of the flux to be wasted into the air.
  • Metal type – different alloys reacts the same. High carbon content weaken the interaction with the magnet.
  • Surface finish – full contact is obtained only on smooth steel. Rough texture create air cushions, weakening the magnet.
  • Temperature influence – high temperature weakens magnetic field. Too high temperature can permanently demagnetize the magnet.

Lifting capacity testing was carried out on a smooth plate of optimal thickness, under a perpendicular pulling force, in contrast under attempts to slide the magnet the holding force is lower. Moreover, even a minimal clearance between the magnet and the plate lowers the load capacity.

Precautions when working with NdFeB magnets
Handling guide

Handle magnets with awareness. Their huge power can shock even professionals. Stay alert and respect their force.

ICD Warning

Life threat: Strong magnets can turn off pacemakers and defibrillators. Do not approach if you have medical devices.

Mechanical processing

Powder produced during machining of magnets is self-igniting. Avoid drilling into magnets without proper cooling and knowledge.

Do not overheat magnets

Avoid heat. NdFeB magnets are sensitive to temperature. If you need resistance above 80°C, inquire about special high-temperature series (H, SH, UH).

Protective goggles

Neodymium magnets are sintered ceramics, meaning they are prone to chipping. Clashing of two magnets will cause them breaking into shards.

Choking Hazard

These products are not toys. Accidental ingestion of a few magnets may result in them connecting inside the digestive tract, which constitutes a critical condition and requires urgent medical intervention.

Metal Allergy

Medical facts indicate that nickel (standard magnet coating) is a potent allergen. If you have an allergy, prevent touching magnets with bare hands and opt for encased magnets.

GPS and phone interference

A strong magnetic field negatively affects the operation of compasses in smartphones and navigation systems. Keep magnets close to a smartphone to prevent damaging the sensors.

Safe distance

Do not bring magnets near a wallet, laptop, or screen. The magnetic field can destroy these devices and erase data from cards.

Pinching danger

Protect your hands. Two large magnets will join immediately with a force of massive weight, crushing everything in their path. Exercise extreme caution!

Caution! Looking for details? Check our post: Why are neodymium magnets dangerous?