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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

product 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

Not sure which magnet to buy?

Call us now +48 22 499 98 98 or contact us by means of inquiry form the contact page.
Weight and shape of a magnet can be tested using our magnetic mass calculator.

Orders submitted before 14:00 will be dispatched today!

💡 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 parameters - 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

Technical specification and ecology

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%

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

Pulling force

Force (N)

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Tesla (T)

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For underwater searches, we recommend specialized holders from the GOLD series, designed for working in difficult conditions. It is equipment that can handle pulling heavy and silted objects from the river bottom. The choice depends on whether you plan to throw from the shore (double-sided) or from a bridge (single-sided).

The 2xTwo-Side version is more versatile, allowing the eyelet to be mounted in two positions. 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.

The magnet is glued into a solid steel cup and sealed with epoxy resin, protecting it from water. The housing significantly increases lifespan but does not make the magnet completely indestructible. 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. A full set usually contains: magnet, polypropylene rope with appropriate strength, protective gloves, hook, and carabiner. We recommend always securing the thread with glue or tightening the eyelet firmly before first use.

This force applies to perfect adherence with the entire surface to a smooth, clean steel plate with a min. thickness of 20mm. 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). We recommend familiarizing yourself with current local regulations and heritage protection laws.

Unlike many market offers, Dhit does not cut corners on components, which translates into a better results during every trip to the water.

The GOLD series utilize heavy-duty, thick-walled steel that provides a true shield for the brittle neodymium.

Many distributors use a trick by advertising the pull force measured only on the top hook. GOLD mounts guarantees full transparency by providing the real parameters of the gear, so you can be sure during real field work.

{By choosing GOLD mounts, you support a local market leader that knows the specifics of local rivers and lakes. Don't risk it with unknown goods, it is better to choose the market leader that cares about the satisfaction of every user.

Advantages as well as disadvantages of neodymium magnets.

Benefits

Besides their high retention, neodymium magnets are valued for these benefits:

They virtually do not lose strength, because even after ten years the decline in efficiency is only ~1% (in laboratory conditions),
They feature excellent resistance to magnetism drop due to external fields,
Thanks to the glossy finish, the plating of Ni-Cu-Ni, gold-plated, or silver-plated gives an clean appearance,
The surface of neodymium magnets generates a maximum magnetic field – this is a distinguishing feature,
Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
Considering the possibility of precise forming and customization to individualized requirements, neodymium magnets can be created in a broad palette of forms and dimensions, which amplifies use scope,
Key role in modern industrial fields – they are used in hard drives, electromotive mechanisms, diagnostic systems, and modern systems.
Thanks to efficiency per cm³, small magnets offer high operating force, occupying minimum space,

Weaknesses

Disadvantages of NdFeB magnets:

To avoid cracks upon strong impacts, we suggest using special steel housings. Such a solution secures the magnet and simultaneously improves its 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 rust in a humid environment - during use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
Limited ability of making nuts in the magnet and complex shapes - recommended is casing - magnet mounting.
Potential hazard resulting from small fragments of magnets are risky, in case of ingestion, which is particularly important in the context of child safety. Additionally, small components of these devices are able to complicate diagnosis medical in case of swallowing.
Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Holding force characteristics

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

The declared magnet strength concerns the maximum value, measured under laboratory conditions, specifically:

on a plate made of structural steel, optimally conducting the magnetic field
whose thickness reaches at least 10 mm
with a plane cleaned and smooth
without the slightest air gap between the magnet and steel
under vertical application of breakaway force (90-degree angle)
at standard ambient temperature

What influences lifting capacity in practice

Bear in mind that the application force may be lower subject to elements below, starting with the most relevant:

Distance (betwixt the magnet and the metal), since even a microscopic clearance (e.g. 0.5 mm) results in a drastic drop in force by up to 50% (this also applies to varnish, rust or dirt).
Loading method – declared lifting capacity refers to detachment vertically. When applying parallel force, the magnet exhibits significantly lower power (often approx. 20-30% of nominal force).
Metal thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field penetrates through instead of generating force.
Chemical composition of the base – mild steel attracts best. Alloy steels lower magnetic permeability and holding force.
Base smoothness – the more even the surface, the larger the contact zone and stronger the hold. Roughness acts like micro-gaps.
Temperature influence – hot environment reduces pulling force. Exceeding the limit temperature can permanently damage the magnet.

Lifting capacity was assessed by applying a polished steel plate of optimal thickness (min. 20 mm), under vertically applied force, in contrast under parallel forces the load capacity is reduced by as much as 75%. Additionally, even a small distance between the magnet and the plate lowers the load capacity.

Precautions when working with neodymium magnets

Adults only

These products are not suitable for play. Accidental ingestion of multiple magnets may result in them pinching intestinal walls, which constitutes a critical condition and necessitates immediate surgery.

Thermal limits

Avoid heat. Neodymium magnets are susceptible to heat. If you need operation above 80°C, look for HT versions (H, SH, UH).

Handling rules

Handle with care. Neodymium magnets attract from a long distance and connect with huge force, often faster than you can react.

Threat to electronics

Data protection: Strong magnets can ruin payment cards and delicate electronics (pacemakers, medical aids, timepieces).

Pacemakers

Warning for patients: Strong magnetic fields affect electronics. Maintain at least 30 cm distance or ask another person to handle the magnets.

Crushing risk

Watch your fingers. Two powerful magnets will join instantly with a force of several hundred kilograms, destroying everything in their path. Be careful!

Do not drill into magnets

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

Magnet fragility

Neodymium magnets are ceramic materials, which means they are very brittle. Collision of two magnets leads to them breaking into shards.

Keep away from electronics

GPS units and mobile phones are extremely sensitive to magnetic fields. Close proximity with a strong magnet can ruin the sensors in your phone.

Allergy Warning

A percentage of the population have a hypersensitivity to nickel, which is the standard coating for neodymium magnets. Extended handling can result in skin redness. It is best to wear protective gloves.

Caution! Details about hazards in the article: Magnet Safety Guide.

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

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

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Elemental analysis

Ecology and recycling (GPSR)

Pulling force

Field Strength

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UMGW 60x30x15 [M10] GW / N38 - magnetic holder internal thread

SM 18x125 [2xM5] / N42 - magnetic separator

CM PML-6 / N45 - magnetic gripper

Advantages as well as disadvantages of neodymium magnets.

Benefits

Weaknesses

Holding force characteristics

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

What influences lifting capacity in practice

Precautions when working with neodymium magnets

Adults only

Thermal limits

Handling rules

Threat to electronics

Pacemakers

Crushing risk

Do not drill into magnets

Magnet fragility

Keep away from electronics

Allergy Warning

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C