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UMP 65x45 [M8]x2 GW F230+ Lina / N38 - search holder

search holder

Catalog no 210386

GTIN: 5906301814054

5.00

Diameter Ø

65 mm [±1 mm]

Height

45 mm [±1 mm]

Weight

1170 g

Load capacity

230.00 kg / 2255.53 N

Coating

[NiCuNi] Nickel

Magnetic Flux

~ 6 000 Gauss [±5%]

180.00 ZŁ with VAT / pcs + price for transport

146.34 ZŁ net + 23% VAT / pcs

bulk discounts:

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Carbon Footprint – environmental impact GPSR Regulation – product safety

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Call us +48 888 99 98 98 if you prefer let us know through contact form through our site.
Weight along with appearance of a neodymium magnet can be checked with our force calculator.

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💡 Check why professionals choose Dhit over cheap substitutes

Instead of believing fairy tales on YouTube with tests on uncertified equipment, see what really determines your magnet's power:

📏 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!

UMP 65x45 [M8]x2 GW F230+ Lina / N38 - search holder

Specification / characteristics UMP 65x45 [M8]x2 GW F230+ Lina / N38 - search holder

properties

properties	values
Cat. no.	210386
GTIN	5906301814054
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	65 mm [±1 mm]
Height	45 mm [±1 mm]
Weight	1170 g
Load capacity ~ ?	230.00 kg / 2255.53 N
Coating	[NiCuNi] Nickel
Holder Type	2 sided
Material Type	Structural steel S235 (ferrous)
Magnetic Flux	~ 6 000 Gauss [±5%]
Rope Length	25 m
Rope Capacity	~ 1595 kg
Rope Diameter	Ø 8 mm
Gloves	1 pair
Size/Mount Quantity	1xM8/2xM10
Manufacturing Tolerance	±1 mm

Magnetic properties of material N38

Specification / characteristics UMP 65x45 [M8]x2 GW F230+ Lina / N38 - search holder

properties	values	units
remenance Br [Min. - Max.] ?	12.2-12.6	kGs
remenance Br [Min. - Max.] ?	1220-1260	T
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 106	°C^-1
Thermal expansion perpendicular (⊥) to orientation (M)	-(1-3) x 10-6	°C^-1
Young's modulus	1.7 x 104	kg/mm²

Quick Unit Converter

Magnet Pull Force

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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 230.00 kg, which translates into high effectiveness in water. 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. 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.

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.

We offer both standalone holders and ready-made gift sets (depending on the selected option in the store). 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.

The capacity given in the name (e.g., 230.00 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). It is worth acting responsibly, cleaning up after yourself, and caring for the environment by removing fished-out scrap.

By choosing the Dhit brand, you get a product of a significantly higher standard and real N52 grade for the average cost.

The unique way of gluing and seating the magnet in the protective cup creates a solid structure that dampens shocks while working on difficult, rocky bottoms.

Many sellers use a trick by promoting the pull force tested exclusively on the vertical mount. Interestingly, in the web, it is hard to find recordings testing the real side-pull force of other brands on the side hook.

{Unlike anonymous sellers, Dhit provides full support and instant service assistance, which is crucial after the purchase. Instead of risking with unknown goods, it is better to choose proven gear that cares about the satisfaction of searcher.

Advantages and disadvantages of neodymium magnets.

Advantages

Besides their remarkable pulling force, neodymium magnets offer the following advantages:

They retain full power for almost ten years – the drop is just ~1% (according to analyses),
They are resistant to demagnetization induced by external field influence,
A magnet with a smooth nickel surface has an effective appearance,
Magnets have impressive magnetic induction on the active area,
Due to their durability and thermal resistance, neodymium magnets can operate (depending on the form) even at high temperatures reaching 230°C or more...
Possibility of exact creating as well as adjusting to atypical needs,
Fundamental importance in high-tech industry – they serve a role in hard drives, electric drive systems, medical equipment, also modern systems.
Compactness – despite small sizes they generate large force, making them ideal for precision applications

Weaknesses

What to avoid - cons of neodymium magnets: tips and applications.

To avoid cracks upon strong impacts, we recommend using special steel housings. Such a solution protects the magnet and simultaneously increases its durability.
When exposed to high temperature, neodymium magnets experience a drop in power. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size and shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
They oxidize in a humid environment - during use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
We suggest a housing - magnetic holder, due to difficulties in creating threads inside the magnet and complex forms.
Health risk resulting from small fragments of magnets pose a threat, when accidentally swallowed, which becomes key in the aspect of protecting the youngest. Additionally, small elements of these devices can disrupt the diagnostic process medical when they are in the body.
High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which increases costs of application in large quantities

Lifting parameters

Maximum holding power of the magnet – what affects it?

The specified lifting capacity refers to the limit force, recorded under optimal environment, specifically:

with the use of a yoke made of special test steel, ensuring full magnetic saturation
with a thickness of at least 10 mm
characterized by even structure
under conditions of gap-free contact (metal-to-metal)
under axial force vector (90-degree angle)
in stable room temperature

Impact of factors on magnetic holding capacity in practice

Holding efficiency is influenced by specific conditions, such as (from priority):

Gap between surfaces – even a fraction of a millimeter of separation (caused e.g. by varnish or unevenness) drastically reduces the pulling force, often by half at just 0.5 mm.
Pull-off angle – remember that the magnet holds strongest perpendicularly. Under sliding down, the holding force drops drastically, often to levels of 20-30% of the nominal value.
Metal thickness – thin material does not allow full use of the magnet. Part of the magnetic field passes through the material instead of converting into lifting capacity.
Material composition – not every steel attracts identically. Alloy additives worsen the interaction with the magnet.
Surface finish – full contact is obtained only on smooth steel. Rough texture create air cushions, weakening the magnet.
Thermal factor – high temperature reduces pulling force. Exceeding the limit temperature can permanently damage the magnet.

Holding force was measured on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, however under shearing force the lifting capacity is smaller. In addition, even a small distance between the magnet’s surface and the plate decreases the lifting capacity.

Warnings

Dust is flammable

Powder generated during grinding of magnets is flammable. Avoid drilling into magnets unless you are an expert.

Product not for children

Strictly store magnets out of reach of children. Risk of swallowing is high, and the effects of magnets connecting inside the body are fatal.

Magnetic media

Device Safety: Neodymium magnets can damage data carriers and sensitive devices (pacemakers, hearing aids, mechanical watches).

Safe operation

Before starting, check safety instructions. Sudden snapping can break the magnet or hurt your hand. Be predictive.

Warning for heart patients

Health Alert: Strong magnets can turn off heart devices and defibrillators. Do not approach if you have electronic implants.

Heat sensitivity

Watch the temperature. Heating the magnet to high heat will ruin its properties and pulling force.

Sensitization to coating

Some people have a contact allergy to Ni, which is the typical protective layer for NdFeB magnets. Prolonged contact may cause a rash. It is best to wear protective gloves.

Fragile material

Watch out for shards. Magnets can explode upon violent connection, ejecting shards into the air. Eye protection is mandatory.

GPS Danger

A powerful magnetic field disrupts the functioning of magnetometers in phones and navigation systems. Maintain magnets close to a smartphone to prevent damaging the sensors.

Pinching danger

Watch your fingers. Two large magnets will snap together instantly with a force of massive weight, crushing everything in their path. Be careful!

Danger! Details about hazards in the article: Safety of working with magnets.

UMP 65x45 [M8]x2 GW F230+ Lina / N38 - search holder

Need help making a decision?

UMP 65x45 [M8]x2 GW F230+ Lina / N38 - search holder

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Magnet Pull Force

Magnetic Induction

Other products

MPL 20x10x1 / N38 - lamellar magnet

MP 8x6/3.5x3 / N38 - ring magnet

UI 45x13x6 [Z323] / N38 - badge holder

MW 10x5 / N38 - cylindrical magnet

Advantages and disadvantages of neodymium magnets.

Advantages

Weaknesses

Lifting parameters

Maximum holding power of the magnet – what affects it?

Impact of factors on magnetic holding capacity in practice

Dust is flammable

Product not for children

Magnetic media

Safe operation

Warning for heart patients

Heat sensitivity

Sensitization to coating

Fragile material

GPS Danger

Pinching danger

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C