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UMP 50x20 [M8] GW / N38 - search holder

search holder

Catalog no 210231

GTIN/EAN: 5906301813910

5.00

Diameter Ø

50 mm [±1 mm]

Height

20 mm [±1 mm]

Weight

0.6 g

Load capacity

130.00 kg / 1274.86 N

Coating

[NiCuNi] Nickel

technical details »

77.00 ZŁ with VAT / pcs + price for transport

62.60 ZŁ net + 23% VAT / pcs

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Carbon Footprint – environmental impact GPSR Regulation – product safety
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Give us a call +48 22 499 98 98 or contact us through form through our site.
Lifting power as well as form of a magnet can be verified on our online calculation tool.

Orders submitted before 14:00 will be dispatched today!

💡 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!

Physical properties - UMP 50x20 [M8] GW / N38 - search holder

Specification / characteristics - UMP 50x20 [M8] GW / N38 - search holder

properties
properties values
Cat. no. 210231
GTIN/EAN 5906301813910
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 50 mm [±1 mm]
Height 20 mm [±1 mm]
Weight 0.6 g
Load capacity ~ ? 130.00 kg / 1274.86 N
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±1 mm

Magnetic properties of material N38

Specification / characteristics UMP 50x20 [M8] GW / 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 specification and ecology
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: 210231-2026
Magnet Unit Converter
Force (pull)
Field Strength
Input your figure in one of the inputs, and the rest change automatically.

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The best choice are magnets in thick, chrome-plated housings dedicated to water applications. Model UMP 50x20 [M8] GW / N38 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. Side mounting is ideal for throwing from the shore, as the magnet drags flat along the bottom. Single-sided magnets are usually lighter and cheaper but less effective for long throws.
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. 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.
The capacity given in the name (e.g., 130.00 kg) is the maximum value measured in laboratory conditions. 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). Magnet fishing is an eco-friendly hobby if you clean the river from trash and scrap.
By choosing the Dhit brand, you get a higher quality standard and true magnetic power for the same market price.
Most magnets on the market have thin casings that deform during the any strong impact against concrete or rocks.
You should know that the same mount pulled by the side hook can actually show only 40 kg of strength instead of the declared 200 kg. The Dhit brand focuses on full transparency by providing the real parameters of the gear, so you avoid disappointment during real field work.
{In contrast to anonymous sellers, Dhit provides expert advice and real warranty help, which is crucial after the purchase. Every mount is checked before shipping, which ensures that you receive equipment of the highest quality.

Strengths as well as weaknesses of Nd2Fe14B magnets.

Strengths

Apart from their notable power, neodymium magnets have these key benefits:
  • They retain magnetic properties for nearly ten years – the loss is just ~1% (according to analyses),
  • Neodymium magnets remain highly resistant to loss of magnetic properties caused by external magnetic fields,
  • The use of an elegant layer of noble metals (nickel, gold, silver) causes the element to present itself better,
  • Neodymium magnets deliver maximum magnetic induction on a contact point, which increases force concentration,
  • Thanks to resistance to high temperature, they are capable of working (depending on the form) even at temperatures up to 230°C and higher...
  • Thanks to the possibility of precise forming and customization to specialized needs, neodymium magnets can be produced in a wide range of geometric configurations, which expands the range of possible applications,
  • Versatile presence in innovative solutions – they are used in hard drives, brushless drives, precision medical tools, and other advanced devices.
  • Thanks to concentrated force, small magnets offer high operating force, in miniature format,

Weaknesses

Disadvantages of NdFeB magnets:
  • They are fragile upon heavy impacts. To avoid cracks, it is worth protecting magnets in special housings. Such protection not only protects the magnet but also increases its resistance to damage
  • 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.
  • When exposed to humidity, magnets usually rust. For applications outside, it is recommended to use protective magnets, such as those in rubber or plastics, which prevent oxidation as well as corrosion.
  • Limited ability of making threads in the magnet and complex shapes - recommended is casing - magnet mounting.
  • Possible danger to health – tiny shards of magnets pose a threat, when accidentally swallowed, which gains importance in the aspect of protecting the youngest. It is also worth noting that small elements of these devices can be problematic in diagnostics medical when they are in the body.
  • High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which hinders application in large quantities

Pull force analysis

Best holding force of the magnet in ideal parameters – what affects it?

Magnet power was determined for ideal contact conditions, taking into account:
  • with the contact of a sheet made of low-carbon steel, ensuring full magnetic saturation
  • whose thickness reaches at least 10 mm
  • with an ideally smooth contact surface
  • with direct contact (no coatings)
  • for force applied at a right angle (pull-off, not shear)
  • at conditions approx. 20°C

Lifting capacity in real conditions – factors

Holding efficiency is affected by working environment parameters, such as (from most important):
  • Distance – existence of any layer (rust, dirt, gap) interrupts the magnetic circuit, which reduces capacity steeply (even by 50% at 0.5 mm).
  • Direction of force – maximum parameter is obtained only during perpendicular pulling. The shear force of the magnet along the surface is standardly several times smaller (approx. 1/5 of the lifting capacity).
  • Plate thickness – insufficiently thick plate does not accept the full field, causing part of the flux to be escaped to the other side.
  • Material type – ideal substrate is pure iron steel. Cast iron may have worse magnetic properties.
  • Smoothness – full contact is possible only on smooth steel. Any scratches and bumps reduce the real contact area, weakening the magnet.
  • Heat – NdFeB sinters have a sensitivity to temperature. At higher temperatures they are weaker, and in frost gain strength (up to a certain limit).

Holding force was measured on the plate surface of 20 mm thickness, when the force acted perpendicularly, whereas under parallel forces the lifting capacity is smaller. Additionally, even a slight gap between the magnet and the plate reduces the lifting capacity.

Safe handling of NdFeB magnets
Sensitization to coating

Warning for allergy sufferers: The Ni-Cu-Ni coating contains nickel. If an allergic reaction appears, immediately stop handling magnets and wear gloves.

Phone sensors

Navigation devices and mobile phones are highly susceptible to magnetic fields. Close proximity with a strong magnet can ruin the sensors in your phone.

Thermal limits

Regular neodymium magnets (N-type) undergo demagnetization when the temperature exceeds 80°C. Damage is permanent.

Medical implants

Health Alert: Strong magnets can turn off pacemakers and defibrillators. Stay away if you have medical devices.

Flammability

Drilling and cutting of neodymium magnets carries a risk of fire hazard. Magnetic powder oxidizes rapidly with oxygen and is hard to extinguish.

No play value

Absolutely keep magnets out of reach of children. Ingestion danger is significant, and the effects of magnets clamping inside the body are very dangerous.

Finger safety

Pinching hazard: The attraction force is so great that it can result in hematomas, pinching, and even bone fractures. Use thick gloves.

Handling rules

Use magnets with awareness. Their powerful strength can shock even professionals. Stay alert and do not underestimate their force.

Electronic devices

Intense magnetic fields can erase data on credit cards, hard drives, and storage devices. Stay away of at least 10 cm.

Fragile material

Neodymium magnets are ceramic materials, which means they are prone to chipping. Clashing of two magnets will cause them shattering into small pieces.

Caution! Want to know more? Check our post: Are neodymium magnets dangerous?