Product available Ships today (order by 14:00)

UMP 107x40 [M8+M10] GW F 400 kg / 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 210338

GTIN/EAN: 5906301813972

5.00

Diameter Ø

107 mm [±1 mm]

Height

40 mm [±1 mm]

Weight

2350 g

Load capacity

480.00 kg / 4707.19 N

Coating

[NiCuNi] Nickel

Magnetic Flux

~ 10 000 Gauss [±5%]

check specifications »

400.00 ZŁ with VAT / pcs + price for transport

325.20 ZŁ net + 23% VAT / pcs

bulk discounts:

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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 otherwise drop us a message via our online form the contact page.
Weight and form of magnetic components can be estimated on our magnetic mass 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!

Physical properties - UMP 107x40 [M8+M10] GW F 400 kg / N38 - search holder

Specification / characteristics - UMP 107x40 [M8+M10] GW F 400 kg / N38 - search holder

properties

properties	values
Cat. no.	210338
GTIN/EAN	5906301813972
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	107 mm [±1 mm]
Height	40 mm [±1 mm]
Weight	2350 g
Load capacity ~ ?	480.00 kg / 4707.19 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 107x40 [M8+M10] GW F 400 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

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

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%

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: 210338-2026

Measurement Calculator

Force (pull)

Force in kg

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Pounds (lbs)

Magnetic Induction

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The best choice are magnets in thick, chrome-plated housings dedicated to water applications. This specific magnet ensures a laboratory lifting capacity of up to 480.00 kg, which translates into high effectiveness in water. For beginners, we recommend lighter single-sided models (F80-F200), for advanced users - heavier double-sided (Two-Side) ones.

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

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.

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. 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.

It is the smartest investment because for the same money, you obtain a premium mount that will last for much longer than generic imports.

The GOLD series utilize a robust construction that provides a true shield for the brittle neodymium.

Many sellers use a trick by promoting the power tested exclusively on the vertical mount. GOLD mounts focuses on full transparency by providing the real parameters of the gear, so you can be sure during treasure hunting.

{Unlike competitors importing from China, Dhit provides expert advice and real warranty help, which gives peace of mind after the purchase. Every mount is individually inspected before delivery, which ensures that you receive equipment of the defect-free.

Strengths as well as weaknesses of neodymium magnets.

Pros

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

They have constant strength, and over nearly 10 years their attraction force decreases symbolically – ~1% (in testing),
They retain their magnetic properties even under close interference source,
Thanks to the glossy finish, the surface of nickel, gold-plated, or silver gives an aesthetic appearance,
They feature high magnetic induction at the operating surface, making them more effective,
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...
Possibility of precise machining as well as optimizing to specific conditions,
Versatile presence in electronics industry – they find application in HDD drives, motor assemblies, advanced medical instruments, as well as other advanced devices.
Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Weaknesses

Cons of neodymium magnets and ways of using them

Susceptibility to cracking is one of their disadvantages. Upon strong impact they can fracture. We recommend keeping them in a special holder, which not only secures them against impacts but also raises their durability
When exposed to high temperature, neodymium magnets suffer a drop in strength. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
Magnets exposed to a humid environment can rust. Therefore when using outdoors, we recommend using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
Due to limitations in producing nuts and complicated shapes in magnets, we recommend using casing - magnetic mount.
Possible danger related to microscopic parts of magnets pose a threat, when accidentally swallowed, which is particularly important in the context of child safety. Furthermore, small elements of these magnets can be problematic in diagnostics medical when they are in the body.
High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which can limit application in large quantities

Pull force analysis

Maximum magnetic pulling force – what contributes to it?

The specified lifting capacity represents the peak performance, obtained under optimal environment, meaning:

using a sheet made of high-permeability steel, functioning as a magnetic yoke
with a thickness minimum 10 mm
with an ideally smooth touching surface
under conditions of no distance (metal-to-metal)
during pulling in a direction vertical to the plane
in neutral thermal conditions

Practical lifting capacity: influencing factors

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 plate), because even a tiny clearance (e.g. 0.5 mm) results in a reduction in lifting capacity by up to 50% (this also applies to varnish, corrosion or dirt).
Loading method – catalog parameter refers to pulling vertically. When applying parallel force, the magnet exhibits much less (often approx. 20-30% of maximum force).
Base massiveness – insufficiently thick sheet does not accept the full field, causing part of the flux to be escaped into the air.
Steel grade – ideal substrate is pure iron steel. Stainless steels may attract less.
Surface condition – smooth surfaces ensure maximum contact, which increases field saturation. Uneven metal weaken the grip.
Temperature – temperature increase causes a temporary drop of force. It is worth remembering the maximum operating temperature for a given model.

Holding force was tested on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, in contrast under shearing force the holding force is lower. Moreover, even a minimal clearance between the magnet’s surface and the plate reduces the holding force.

Safety rules for work with NdFeB magnets

Nickel allergy

Warning for allergy sufferers: The Ni-Cu-Ni coating contains nickel. If redness occurs, immediately stop working with magnets and use protective gear.

Thermal limits

Monitor thermal conditions. Heating the magnet above 80 degrees Celsius will permanently weaken its properties and strength.

Keep away from computers

Equipment safety: Neodymium magnets can ruin payment cards and sensitive devices (pacemakers, hearing aids, timepieces).

Shattering risk

Watch out for shards. Magnets can explode upon uncontrolled impact, launching sharp fragments into the air. Wear goggles.

Pinching danger

Large magnets can smash fingers in a fraction of a second. Under no circumstances place your hand between two strong magnets.

Adults only

Only for adults. Small elements can be swallowed, leading to severe trauma. Keep away from kids and pets.

Compass and GPS

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

Immense force

Exercise caution. Neodymium magnets act from a distance and snap with huge force, often faster than you can move away.

Warning for heart patients

Individuals with a heart stimulator must maintain an safe separation from magnets. The magnetism can disrupt the functioning of the implant.

Mechanical processing

Powder created during cutting of magnets is flammable. Do not drill into magnets without proper cooling and knowledge.

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

UMP 107x40 [M8+M10] GW F 400 kg / N38 - search holder

Physical properties - UMP 107x40 [M8+M10] GW F 400 kg / N38 - search holder

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Elemental analysis

Sustainability

Force (pull)

Magnetic Induction

Other proposals

MW 38x3.5 / N38 - cylindrical magnet

UMT 12x20 blue / N38 - board holder

SM 32x350 [2xM8] / N52 - magnetic separator

LM TLN - 15 SQ / N38 - magnetic leviton

Strengths as well as weaknesses of neodymium magnets.

Pros

Weaknesses

Pull force analysis

Maximum magnetic pulling force – what contributes to it?

Practical lifting capacity: influencing factors

Safety rules for work with NdFeB magnets

Nickel allergy

Thermal limits

Keep away from computers

Shattering risk

Pinching danger

Adults only

Compass and GPS

Immense force

Warning for heart patients

Mechanical processing

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C