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UMP 135x40 [M10+M12] GW F600 Lina / N38 - search holder

search holder

Catalog no 210385

GTIN/EAN: 5906301814047

5.00

Diameter Ø

135 mm [±1 mm]

Height

40 mm [±1 mm]

Weight

4300 g

Load capacity

680.00 kg / 6668.52 N

Coating

[NiCuNi] Nickel

Magnetic Flux

~ 10 000 Gauss [±5%]

check properties »

649.99 ZŁ with VAT / pcs + price for transport

528.45 ZŁ net + 23% VAT / pcs

bulk discounts:

Need more?
price from 1 pcs
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649.99 ZŁ
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Carbon Footprint – environmental impact GPSR Regulation – product safety
Need advice?

Contact us by phone +48 22 499 98 98 otherwise contact us by means of contact form the contact page.
Lifting power along with appearance of a neodymium magnet can be checked with our force calculator.

Order by 14:00 and we’ll ship today!

💡 Guide: How to choose a decent magnet and not get ripped off?

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!

Technical parameters of the product - UMP 135x40 [M10+M12] GW F600 Lina / N38 - search holder

Specification / characteristics - UMP 135x40 [M10+M12] GW F600 Lina / N38 - search holder

properties
properties values
Cat. no. 210385
GTIN/EAN 5906301814047
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 135 mm [±1 mm]
Height 40 mm [±1 mm]
Weight 4300 g
Load capacity ~ ? 680.00 kg / 6668.52 N
Coating [NiCuNi] Nickel
Holder Type 2 sided
Material Type Structural steel S235 (ferrous)
Magnetic Flux ~ 10 000 Gauss [±5%]
Rope Length 25 m
Rope Capacity ~ 1595 kg
Rope Diameter Ø 8 mm
Gloves 1 pair
Size/Mount Quantity 3xM10
Manufacturing Tolerance ±1 mm

Magnetic properties of material N38

Specification / characteristics UMP 135x40 [M10+M12] GW F600 Lina / 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%
Environmental data
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: 210385-2026
Magnet Unit Converter
Magnet pull force
Magnetic Induction
Type your figure in any box, to see all other values change in real-time.

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For underwater searches, we recommend specialized holders from the GOLD series, designed for working in difficult conditions. Model UMP 135x40 [M10+M12] GW F600 Lina / 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.
Double-sided holders (Two-Side) have two active magnetic surfaces and two mounting holes. 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. 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.
The capacity given in the name (e.g., 680.00 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.
In contrast to many market offers, Dhit uses the highest quality components, which translates into a clear advantage during every trip to the water.
Most competitor mounts have weak shells that deform during the first hard impact against underwater obstacles.
Many distributors employ a tactic by promoting the power measured exclusively on the top hook. GOLD mounts focuses on honest data by stating the real parameters of the magnet, so you avoid disappointment during treasure hunting.
{By choosing Dhit, you support a local market leader that knows the specifics of our waters. Every mount is checked before shipping, which ensures that you the set will be of the defect-free.

Pros and cons of neodymium magnets.

Strengths

Besides their high retention, neodymium magnets are valued for these benefits:
  • They retain attractive force for almost ten years – the loss is just ~1% (according to analyses),
  • They have excellent resistance to weakening of magnetic properties when exposed to external magnetic sources,
  • The use of an metallic finish of noble metals (nickel, gold, silver) causes the element to be more visually attractive,
  • The surface of neodymium magnets generates a strong magnetic field – this is one of their assets,
  • Through (appropriate) combination of ingredients, they can achieve high thermal resistance, allowing for operation at temperatures approaching 230°C and above...
  • Possibility of custom shaping and adjusting to concrete requirements,
  • Key role in high-tech industry – they serve a role in hard drives, electromotive mechanisms, advanced medical instruments, as well as technologically advanced constructions.
  • Thanks to efficiency per cm³, small magnets offer high operating force, occupying minimum space,

Disadvantages

Problematic aspects of neodymium magnets: tips and applications.
  • At strong impacts they can break, therefore we recommend placing them in strong housings. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • We warn that neodymium magnets can lose their power at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
  • When exposed to humidity, magnets start to rust. To use them in conditions outside, it is recommended to use protective magnets, such as those in rubber or plastics, which prevent oxidation and corrosion.
  • We recommend a housing - magnetic mechanism, due to difficulties in realizing nuts inside the magnet and complex shapes.
  • Possible danger resulting from small fragments of magnets pose a threat, in case of ingestion, which becomes key in the context of child safety. Furthermore, small elements of these products can disrupt the diagnostic process 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

Lifting parameters

Maximum magnetic pulling force – what it depends on?

The force parameter is a measurement result executed under standard conditions:
  • with the application of a sheet made of special test steel, guaranteeing maximum field concentration
  • whose thickness reaches at least 10 mm
  • characterized by even structure
  • under conditions of gap-free contact (metal-to-metal)
  • during detachment in a direction perpendicular to the plane
  • at standard ambient temperature

Practical aspects of lifting capacity – factors

During everyday use, the actual holding force depends on several key aspects, presented from most significant:
  • Gap (between the magnet and the plate), since even a tiny clearance (e.g. 0.5 mm) can cause a reduction in force by up to 50% (this also applies to paint, corrosion or debris).
  • Force direction – note that the magnet has greatest strength perpendicularly. Under sliding down, the holding force drops drastically, often to levels of 20-30% of the maximum value.
  • Wall thickness – thin material does not allow full use of the magnet. Magnetic flux penetrates through instead of converting into lifting capacity.
  • Steel grade – ideal substrate is pure iron steel. Stainless steels may generate lower lifting capacity.
  • Surface condition – smooth surfaces guarantee perfect abutment, which increases force. Rough surfaces weaken the grip.
  • Thermal factor – high temperature weakens magnetic field. Too high temperature can permanently demagnetize the magnet.

Lifting capacity testing was conducted on plates with a smooth surface of optimal thickness, under a perpendicular pulling force, in contrast under attempts to slide the magnet the lifting capacity is smaller. Additionally, even a slight gap between the magnet’s surface and the plate lowers the holding force.

Safety rules for work with NdFeB magnets
Keep away from electronics

GPS units and mobile phones are highly sensitive to magnetic fields. Direct contact with a powerful NdFeB magnet can decalibrate the internal compass in your phone.

Power loss in heat

Standard neodymium magnets (N-type) lose magnetization when the temperature goes above 80°C. Damage is permanent.

Magnetic media

Data protection: Neodymium magnets can damage data carriers and delicate electronics (heart implants, hearing aids, timepieces).

Caution required

Be careful. Rare earth magnets act from a distance and connect with huge force, often faster than you can react.

Risk of cracking

Despite the nickel coating, neodymium is brittle and cannot withstand shocks. Avoid impacts, as the magnet may shatter into sharp, dangerous pieces.

Combustion hazard

Combustion risk: Neodymium dust is explosive. Avoid machining magnets without safety gear as this may cause fire.

Avoid contact if allergic

Studies show that the nickel plating (standard magnet coating) is a common allergen. If your skin reacts to metals, refrain from touching magnets with bare hands and select coated magnets.

Danger to pacemakers

Medical warning: Neodymium magnets can deactivate heart devices and defibrillators. Do not approach if you have medical devices.

Finger safety

Danger of trauma: The pulling power is so immense that it can cause hematomas, crushing, and broken bones. Protective gloves are recommended.

Swallowing risk

Strictly keep magnets out of reach of children. Risk of swallowing is significant, and the effects of magnets clamping inside the body are very dangerous.

Security! Need more info? Read our article: Are neodymium magnets dangerous?