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UMH 25x8x45 [M5] / N38 - magnetic holder with hook

magnetic holder with hook

Catalog no 310426

GTIN/EAN: 5906301814559

5.00
Load capacity 25.00 kg / 245.17 N
Diameter Ø
25 mm [±1 mm]
Height
45 mm [±1 mm]
Height
8 mm [±1 mm]
Weight
33 g
Magnetization Direction
↑ axial
Coating
[NiCuNi] Nickel

How we measure these parameters — certificates and measurements

view properties »

11.78 zł net / pcs

14.49 zł with VAT (23% VAT) / pcs

price for transport

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14.49 zł
price from 30 pcs
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price from 70 pcs
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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.

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Technical details - UMH 25x8x45 [M5] / N38 - magnetic holder with hook

Specification / characteristics - UMH 25x8x45 [M5] / N38 - magnetic holder with hook

properties
properties values
Cat. no. 310426
GTIN/EAN 5906301814559
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 25 mm [±1 mm]
Height 45 mm [±1 mm]
Height 8 mm [±1 mm]
Weight 33 g
Magnetization Direction ↑ axial
Load capacity ~ ? 25.00 kg / 245.17 N
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±1 mm

Magnetic properties of material N38

Specification / characteristics UMH 25x8x45 [M5] / N38 - magnetic holder with hook
properties values units
Remanence Br ? 12.2-12.6 kGs
Remanence Br ? 1220-1260 mT
Coercivity bHc ? 10.8-11.5 kOe
Coercivity bHc ? 860-915 kA/m
Intrinsic coercivity iHc ≥ 12 kOe
Intrinsic coercivity iHc ≥ 955 kA/m
Energy product BHmax ? 36-38 BH max MGOe
Energy product BHmax ? 287-303 BH max KJ/m
Maximum working 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

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%

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: 310426-2026
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They serve to create mobile suspension points without the need to drill holes in beams. You can use them to organize wires, hang tools, or clothes on metal racks.
The magnet has a standard threaded socket, which allows replacing the hook with any other accessory with a thread. Thanks to this, one magnet can perform many functions - sometimes be a hook, and sometimes a holder for a bolt.
You will get the greatest force by mounting the magnet on a thick, smooth steel surface vertically. If you hang the magnet on a wall, the real capacity is approx. 20-30% of the nominal value.
The steel housing (cup) shields the magnetic field, directing all its power downwards, onto the contact surface. The housing ensures mechanical durability, which is important in industrial and assembly conditions.
In the bathroom or kitchen, they will work perfectly, provided they are not directly splashed with water. If you are looking for an outdoor hanger, choose a model in rubberized or plastic housing, which is tight.

Pros and cons of rare earth magnets.

Benefits

Besides their high retention, neodymium magnets are valued for these benefits:
  • They do not lose power, even after approximately ten years – the drop in lifting capacity is only ~1% (theoretically),
  • Magnets effectively protect themselves against demagnetization caused by ambient magnetic noise,
  • Thanks to the shimmering finish, the layer of nickel, gold-plated, or silver gives an modern appearance,
  • Magnetic induction on the working part of the magnet is maximum,
  • Thanks to resistance to high temperature, they are able to function (depending on the shape) even at temperatures up to 230°C and higher...
  • Considering the potential of precise forming and adaptation to unique needs, magnetic components can be manufactured in a variety of geometric configurations, which increases their versatility,
  • Key role in modern technologies – they are utilized in magnetic memories, electric motors, medical devices, and modern systems.
  • Thanks to concentrated force, small magnets offer high operating force, occupying minimum space,

Limitations

What to avoid - cons of neodymium magnets and proposals for their use:
  • At very strong impacts they can break, therefore we recommend placing them in strong housings. A metal housing provides additional protection against damage and increases the magnet's durability.
  • We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 230°C.
  • When exposed to humidity, magnets usually 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.
  • Limited possibility of producing threads in the magnet and complex shapes - recommended is casing - magnetic holder.
  • Health risk related to microscopic parts of magnets can be dangerous, when accidentally swallowed, which becomes key in the context of child health protection. Furthermore, small elements of these devices can be problematic in diagnostics medical in case of swallowing.
  • With mass production the cost of neodymium magnets is a challenge,

Lifting parameters

Maximum lifting force for a neodymium magnet – what affects it?

Information about lifting capacity was determined for the most favorable conditions, assuming:
  • using a base made of high-permeability steel, serving as a ideal flux conductor
  • possessing a thickness of minimum 10 mm to avoid saturation
  • with a plane free of scratches
  • with zero gap (without paint)
  • under vertical force vector (90-degree angle)
  • at standard ambient temperature

Practical lifting capacity: influencing factors

Please note that the working load may be lower subject to the following factors, in order of importance:
  • Clearance – the presence of foreign body (paint, tape, air) interrupts the magnetic circuit, which lowers power steeply (even by 50% at 0.5 mm).
  • Force direction – catalog parameter refers to pulling vertically. When attempting to slide, the magnet exhibits much less (often approx. 20-30% of maximum force).
  • Wall thickness – thin material does not allow full use of the magnet. Magnetic flux passes through the material instead of converting into lifting capacity.
  • Metal type – not every steel reacts the same. Alloy additives worsen the interaction with the magnet.
  • Surface condition – ground elements guarantee perfect abutment, which improves field saturation. Uneven metal reduce efficiency.
  • Temperature – heating the magnet causes a temporary drop of induction. It is worth remembering the thermal limit for a given model.

Lifting capacity was determined with the use of a polished steel plate of optimal thickness (min. 20 mm), under vertically applied force, in contrast under shearing force the lifting capacity is smaller. In addition, even a slight gap between the magnet’s surface and the plate reduces the lifting capacity.

Warnings
Safe operation

Use magnets consciously. Their powerful strength can shock even professionals. Stay alert and respect their power.

Keep away from computers

Powerful magnetic fields can destroy records on payment cards, HDDs, and other magnetic media. Stay away of at least 10 cm.

Demagnetization risk

Avoid heat. Neodymium magnets are susceptible to heat. If you need operation above 80°C, look for special high-temperature series (H, SH, UH).

Eye protection

NdFeB magnets are ceramic materials, which means they are very brittle. Collision of two magnets will cause them cracking into shards.

GPS Danger

A strong magnetic field disrupts the functioning of magnetometers in smartphones and GPS navigation. Do not bring magnets close to a device to avoid breaking the sensors.

Bodily injuries

Pinching hazard: The attraction force is so immense that it can result in blood blisters, crushing, and even bone fractures. Protective gloves are recommended.

Medical implants

For implant holders: Powerful magnets affect medical devices. Maintain at least 30 cm distance or request help to work with the magnets.

Dust is flammable

Machining of neodymium magnets carries a risk of fire risk. Magnetic powder oxidizes rapidly with oxygen and is difficult to extinguish.

Warning for allergy sufferers

Studies show that the nickel plating (standard magnet coating) is a potent allergen. For allergy sufferers, avoid direct skin contact or choose encased magnets.

Adults only

Product intended for adults. Small elements pose a choking risk, causing intestinal necrosis. Store out of reach of kids and pets.

Attention! More info about risks in the article: Safety of working with magnets.