← previous
next →
Product available Ships today (order by 14:00) CO2 GPSR PPWR REACH

UMP 135x40 [M10+M12] GW F 600 kg / N38 - search holder

search holder

Catalog no 210339

GTIN/EAN: 5906301813989

5.00
Load capacity 680.00 kg / 6668.52 N
Diameter Ø
135 mm [±1 mm]
Height
40 mm [±1 mm]
Weight
4300 g
Coating
[NiCuNi] Nickel
Magnetic Flux
~ 10 000 Gauss [±5%]
product specifications »

487.80 zł net / pcs

599.99 zł with VAT (23% VAT) / pcs

price for transport

bulk discounts:

Need more?
Quantity
Net
Gross
price from 1 pcs
487.80 zł
599.99 zł
price from 5 pcs
458.53 zł
563.99 zł
price from 10 pcs
429.26 zł
527.99 zł

Frequently asked questions

How much will a magnetic holder hold in practice?
The catalogue value assumes full contact with smooth steel at least 10 mm thick and a perpendicular pull. Thinner sheet, paint, rust and surface irregularities reduce it considerably: on 1 mm sheet about half remains. Lifting and vertical mounting call for an additional safety margin.
Will a holder work on stainless steel?
Not on austenitic grades 304 and 316 — they are effectively non-magnetic. It will not work on aluminium, copper or brass either. Those materials need a mechanical gripper.
Which coating for which conditions?
Nickel-copper-nickel (NiCuNi) is the standard and covers most applications. Epoxy is used for damp environments and outdoor work, zinc is sufficient for dry interiors. Holders in a steel housing or in rubber also protect the magnet against impact.

Guides from the knowledge base

Want to talk magnets?

Call us now +48 888 99 98 98 alternatively let us know using contact form the contact section.
Specifications and structure of a neodymium magnet can be estimated using our power calculator.

Order by 14:00 and we’ll ship 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 details - UMP 135x40 [M10+M12] GW F 600 kg / N38 - search holder

Specification / characteristics - UMP 135x40 [M10+M12] GW F 600 kg / N38 - search holder

properties
properties values
Cat. no. 210339
GTIN/EAN 5906301813989
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%]
Size/Mount Quantity 2xM10/1xM12
Manufacturing Tolerance ±1 mm

Magnetic properties of material N38

Specification / characteristics UMP 135x40 [M10+M12] GW F 600 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

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 310 °C
Curie Temperature TF 590 °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 and environmental data

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%

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: 210339-2026
Quick Unit Converter

Force (pull)

Magnetic Induction

Type data in a box, and all other values change automatically.

Other products

SMZR 25x125 / N52 - magnetic separator with handle
Product available Ships today (order by 14:00)

SMZR 25x125 / N52 - magnetic separator with handle

424.35 zł brutto / pcs
MW 12x4 / N52 - cylindrical magnet
Product available Ships today (order by 14:00)

MW 12x4 / N52 - cylindrical magnet

2.18 zł brutto / pcs
SM 25x100 [2xM8] / N52 - magnetic separator
Product available Ships today (order by 14:00)

SM 25x100 [2xM8] / N52 - magnetic separator

369.00 zł brutto / pcs
MP 12x8/4x3 / N38 - ring magnet
Product available Ships today (order by 14:00)

MP 12x8/4x3 / N38 - ring magnet

1.427 zł brutto / pcs
It is worth betting on proven F200, F300, or F550 models from our offer, which guarantee real power. Model UMP 135x40 [M10+M12] GW F 600 kg / 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 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. Despite solid construction, neodymium is a brittle material and can chip upon very strong impact (e.g., against concrete). Maintenance (e.g., WD-40) prevents surface corrosion of the steel housing.
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. 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.
If you find a dangerous object (unexploded ordnance) or an antique, you have a legal obligation to report it to appropriate services (Police, conservator). Magnet fishing is an eco-friendly hobby if you clean the river from trash and scrap.
In contrast to many market offers, Dhit uses the highest quality materials, which translates into a clear advantage during treasure hunting.
The GOLD series feature a robust construction that provides a true shield for the magnetic core.
Many sellers use a trick by promoting the power tested only on the top hook. GOLD mounts guarantees honest data by providing the actual capabilities of the magnet, so you avoid disappointment during treasure hunting.
{By choosing Dhit, you support Polish engineering that knows the specifics of our waters. Every mount is checked before delivery, which ensures that you receive equipment of the defect-free.

Pros and cons of Nd2Fe14B magnets.

Strengths

In addition to their magnetic efficiency, neodymium magnets provide the following advantages:
  • They virtually do not lose strength, because even after 10 years the decline in efficiency is only ~1% (according to literature),
  • Magnets very well defend themselves against demagnetization caused by external fields,
  • The use of an shiny finish of noble metals (nickel, gold, silver) causes the element to look better,
  • Neodymium magnets achieve maximum magnetic induction on a small area, 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...
  • In view of the possibility of accurate shaping and customization to unique needs, NdFeB magnets can be manufactured in a wide range of forms and dimensions, which increases their versatility,
  • Huge importance in electronics industry – they find application in computer drives, drive modules, diagnostic systems, also other advanced devices.
  • Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Limitations

Disadvantages of neodymium magnets:
  • To avoid cracks upon strong impacts, we suggest using special steel housings. Such a solution secures 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 strength (a factor is the shape and 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 while using outdoors, we suggest using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
  • Due to limitations in realizing threads and complex shapes in magnets, we recommend using casing - magnetic holder.
  • Possible danger to health – tiny shards of magnets pose a threat, if swallowed, which becomes key in the context of child safety. Furthermore, small components of these devices are able to disrupt the diagnostic process medical after entering the body.
  • With mass production the cost of neodymium magnets is a challenge,

Pull force analysis

Best holding force of the magnet in ideal parameters – what affects it?

Information about lifting capacity was determined for optimal configuration, assuming:
  • on a base made of mild steel, perfectly concentrating the magnetic field
  • whose transverse dimension equals approx. 10 mm
  • with an polished touching surface
  • under conditions of gap-free contact (surface-to-surface)
  • for force acting at a right angle (pull-off, not shear)
  • at conditions approx. 20°C

Lifting capacity in real conditions – factors

It is worth knowing that the working load may be lower influenced by the following factors, in order of importance:
  • Air gap (between the magnet and the plate), because even a microscopic clearance (e.g. 0.5 mm) results in a drastic drop in lifting capacity by up to 50% (this also applies to varnish, rust or dirt).
  • Force direction – declared lifting capacity refers to detachment vertically. When attempting to slide, the magnet holds much less (often approx. 20-30% of maximum force).
  • Substrate thickness – for full efficiency, the steel must be sufficiently thick. Paper-thin metal limits the attraction force (the magnet "punches through" it).
  • Metal type – different alloys reacts the same. Alloy additives weaken the interaction with the magnet.
  • Surface condition – ground elements ensure maximum contact, which increases field saturation. Uneven metal reduce efficiency.
  • Temperature – temperature increase results in weakening of induction. It is worth remembering the maximum operating temperature for a given model.

Lifting capacity testing was performed on plates with a smooth surface of optimal thickness, under perpendicular forces, in contrast under attempts to slide the magnet the holding force is lower. In addition, even a small distance between the magnet’s surface and the plate lowers the load capacity.

Warnings
Combustion hazard

Fire warning: Neodymium dust is highly flammable. Avoid machining magnets without safety gear as this may cause fire.

Medical interference

For implant holders: Powerful magnets affect medical devices. Keep at least 30 cm distance or ask another person to work with the magnets.

Hand protection

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

Beware of splinters

Despite the nickel coating, neodymium is brittle and not impact-resistant. Avoid impacts, as the magnet may crumble into sharp, dangerous pieces.

Metal Allergy

Nickel alert: The nickel-copper-nickel coating consists of nickel. If skin irritation occurs, cease handling magnets and wear gloves.

Handling rules

Before use, read the rules. Uncontrolled attraction can destroy the magnet or injure your hand. Be predictive.

GPS Danger

An intense magnetic field interferes with the functioning of compasses in phones and GPS navigation. Keep magnets close to a smartphone to avoid damaging the sensors.

Adults only

NdFeB magnets are not suitable for play. Eating a few magnets may result in them connecting inside the digestive tract, which poses a severe health hazard and requires urgent medical intervention.

Demagnetization risk

Avoid heat. Neodymium magnets are susceptible to heat. If you require resistance above 80°C, ask us about HT versions (H, SH, UH).

Electronic devices

Very strong magnetic fields can corrupt files on payment cards, hard drives, and other magnetic media. Maintain a gap of at least 10 cm.

Security! Learn more about hazards in the article: Magnet Safety Guide.