Product on order Ships in 3-5 days

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

Name: Dhit sp. z o.o.
Address: Kościuszki 6A, Ożarów Mazowiecki, Poland, 05-850, PL
Telephone: +48 22 499 98 98
Price range: PLN 1-6500
Rating: 5

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

see technical data »

77.00 ZŁ with VAT / pcs + price for transport

62.60 ZŁ net + 23% VAT / pcs

bulk discounts:

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price from 1 pcs

62.60 ZŁ

77.00 ZŁ

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58.84 ZŁ

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Carbon Footprint – environmental impact GPSR Regulation – product safety

Want to negotiate?

Pick up the phone and ask +48 888 99 98 98 if you prefer get in touch via our online form through our site.
Lifting power and structure of a magnet can be checked using our magnetic calculator.

Orders placed before 14:00 will be shipped the same business day.

💡 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!

Technical specification - 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

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

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%

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

Measurement Calculator

Magnet pull force

Force in kg

lbs

Magnetic Induction

Tesla (T)

Input your figure into any field, to see the rest will recalculate in real-time.

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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. 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. Top mounting works well when fishing from a bridge, pier, or well (vertical technique). 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). Avoid throwing the magnet against bridge pillars or hard obstacles. 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. 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.

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. Magnet fishing is an eco-friendly hobby if you clean the river from trash and scrap.

It is the best value because for the same money, you buy professional-grade equipment that will last for much longer than budget alternatives.

Dhit GOLD mounts feature a robust construction that acts as a real armor for the brittle neodymium.

You should know that the same mount pulled by the side hook often has only a fraction of power instead of the declared 200 kg. The Dhit brand focuses on full transparency by providing the real parameters of the gear, so you can be sure during treasure hunting.

{Unlike anonymous sellers, Dhit provides expert advice and instant service assistance, which gives peace of mind after the purchase. Don't risk it with random brands, it is better to choose the market leader that ensures the satisfaction of every user.

Pros as well as cons of Nd₂Fe₁₄B magnets.

Pros

Besides their tremendous magnetic power, neodymium magnets offer the following advantages:

They virtually do not lose strength, because even after ten years the decline in efficiency is only ~1% (according to literature),
They are resistant to demagnetization induced by external field influence,
In other words, due to the metallic surface of gold, the element gains visual value,
Neodymium magnets create maximum magnetic induction on a small surface, which ensures high operational effectiveness,
Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the form) even at high temperatures reaching 230°C or more...
Thanks to modularity in forming and the ability to modify to complex applications,
Versatile presence in future technologies – they find application in computer drives, drive modules, advanced medical instruments, also modern systems.
Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in compact dimensions, which makes them useful in small systems

Weaknesses

Disadvantages of NdFeB magnets:

To avoid cracks under impact, we suggest using special steel holders. Such a solution protects the magnet and simultaneously improves its durability.
NdFeB magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of power (a factor is the shape as well as dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are extremely resistant to heat
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 ability of producing nuts in the magnet and complicated shapes - recommended is cover - mounting mechanism.
Health risk resulting from small fragments of magnets pose a threat, when accidentally swallowed, which is particularly important in the context of child safety. Furthermore, small elements of these products can complicate diagnosis medical when they are in the body.
Due to complex production process, their price exceeds standard values,

Pull force analysis

Highest magnetic holding force – what it depends on?

Magnet power was defined for optimal configuration, assuming:

on a plate made of mild steel, effectively closing the magnetic flux
whose thickness is min. 10 mm
characterized by smoothness
without the slightest clearance between the magnet and steel
under vertical force direction (90-degree angle)
in stable room temperature

Key elements affecting lifting force

In practice, the real power depends on a number of factors, ranked from crucial:

Gap between magnet and steel – every millimeter of distance (caused e.g. by varnish or unevenness) drastically reduces the magnet efficiency, often by half at just 0.5 mm.
Angle of force application – maximum parameter is reached only during perpendicular pulling. The resistance to sliding of the magnet along the surface is typically several times smaller (approx. 1/5 of the lifting capacity).
Base massiveness – insufficiently thick steel causes magnetic saturation, causing part of the power to be lost to the other side.
Plate material – mild steel attracts best. Higher carbon content decrease magnetic permeability and holding force.
Surface finish – ideal contact is obtained only on polished steel. Rough texture reduce the real contact area, reducing force.
Temperature influence – high temperature 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 attempts to slide the magnet the lifting capacity is smaller. Additionally, even a small distance between the magnet and the plate lowers the holding force.

Precautions when working with neodymium magnets

Permanent damage

Regular neodymium magnets (N-type) lose magnetization when the temperature exceeds 80°C. The loss of strength is permanent.

This is not a toy

Adult use only. Small elements pose a choking risk, leading to severe trauma. Keep out of reach of children and animals.

Fire risk

Combustion risk: Rare earth powder is explosive. Avoid machining magnets without safety gear as this risks ignition.

Protective goggles

Despite the nickel coating, the material is brittle and not impact-resistant. Avoid impacts, as the magnet may shatter into hazardous fragments.

Allergic reactions

Studies show that the nickel plating (standard magnet coating) is a common allergen. If your skin reacts to metals, prevent direct skin contact and opt for encased magnets.

Phone sensors

Remember: rare earth magnets generate a field that disrupts sensitive sensors. Keep a safe distance from your mobile, device, and GPS.

Handling rules

Exercise caution. Neodymium magnets attract from a distance and snap with huge force, often quicker than you can react.

Danger to pacemakers

For implant holders: Strong magnetic fields disrupt medical devices. Maintain minimum 30 cm distance or ask another person to work with the magnets.

Serious injuries

Risk of injury: The pulling power is so immense that it can cause hematomas, crushing, and even bone fractures. Use thick gloves.

Protect data

Powerful magnetic fields can destroy records on credit cards, HDDs, and other magnetic media. Keep a distance of min. 10 cm.

Attention! More info about risks in the article: Safety of working with magnets.

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

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

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Material specification

Ecology and recycling (GPSR)

Magnet pull force

Magnetic Induction

See more products

SMZR 32x100 / N52 - magnetic separator with handle

MW 45x35 / N38 - cylindrical magnet

MP 8x6/3.5x3 / N38 - ring magnet

UMGW 16x13x5 [M4] GW / N38 - magnetic holder internal thread

Pros as well as cons of Nd2Fe14B magnets.

Pros

Weaknesses

Pull force analysis

Highest magnetic holding force – what it depends on?

Key elements affecting lifting force

Precautions when working with neodymium magnets

Permanent damage

This is not a toy

Fire risk

Protective goggles

Allergic reactions

Phone sensors

Handling rules

Danger to pacemakers

Serious injuries

Protect data

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

Pros as well as cons of Nd₂Fe₁₄B magnets.