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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
check parameters »

14.49 zł with VAT / pcs + price for transport

11.78 zł net + 23% VAT / pcs

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Carbon Footprint – environmental impact GPSR Regulation – product safety
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Strength and shape of a neodymium magnet can be calculated on our online calculation tool.

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Technical data of the product - 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
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

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%

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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Holders with a hook are indispensable in large-format stores and warehouses for suspending advertisements (POS systems). In workshops and garages, they work perfectly for guiding cables or hanging work lighting.
The magnet has a standard threaded socket, which allows replacing the hook with any other accessory with a thread. This gives huge application flexibility and allows adapting the holder to current needs.
The nominal capacity (e.g., 25.00 kg) refers to perpendicular (vertical) force when mounted on the ceiling. If you hang the magnet on a wall, the real capacity is approx. 20-30% of the nominal value.
The cup acts as a magnetic armature, intensifying the neodymium action and increasing efficiency. The housing ensures mechanical durability, which is important in industrial and assembly conditions.
For outdoor use (in rain), metal hangers may eventually develop a rusty coating over time. Metal elements can rust with constant contact with atmospheric moisture.

Pros and cons of rare earth magnets.

Strengths

Apart from their consistent magnetic energy, neodymium magnets have these key benefits:
  • They do not lose magnetism, even after nearly 10 years – the decrease in power is only ~1% (theoretically),
  • They retain their magnetic properties even under strong external field,
  • A magnet with a smooth nickel surface looks better,
  • They show high magnetic induction at the operating surface, which increases their power,
  • Thanks to resistance to high temperature, they are able to function (depending on the form) even at temperatures up to 230°C and higher...
  • Possibility of individual creating as well as modifying to concrete needs,
  • Key role in future technologies – they serve a role in hard drives, electromotive mechanisms, precision medical tools, and other advanced devices.
  • Thanks to efficiency per cm³, small magnets offer high operating force, occupying minimum space,

Limitations

Drawbacks and weaknesses of neodymium magnets and ways of using them
  • They are fragile upon too strong impacts. To avoid cracks, it is worth securing magnets in a protective case. Such protection not only shields the magnet but also improves its resistance to damage
  • Neodymium magnets decrease their force under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures up to 230°C
  • When exposed to humidity, magnets usually rust. To use them in conditions outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which secure oxidation and corrosion.
  • Due to limitations in creating threads and complicated forms in magnets, we recommend using casing - magnetic holder.
  • Possible danger resulting from small fragments of magnets pose a threat, in case of ingestion, which gains importance in the aspect of protecting the youngest. Additionally, small components of these magnets are able to disrupt the diagnostic process medical in case of swallowing.
  • With budget limitations the cost of neodymium magnets is economically unviable,

Holding force characteristics

Magnetic strength at its maximum – what contributes to it?

The declared magnet strength concerns the limit force, recorded under ideal test conditions, meaning:
  • using a sheet made of high-permeability steel, serving as a ideal flux conductor
  • whose thickness equals approx. 10 mm
  • with a plane cleaned and smooth
  • under conditions of ideal adhesion (surface-to-surface)
  • for force applied at a right angle (pull-off, not shear)
  • in neutral thermal conditions

Practical lifting capacity: influencing factors

It is worth knowing that the magnet holding will differ influenced by the following factors, in order of importance:
  • Air gap (betwixt the magnet and the metal), since even a tiny distance (e.g. 0.5 mm) leads to a reduction in lifting capacity by up to 50% (this also applies to paint, corrosion or dirt).
  • Loading method – catalog parameter refers to pulling vertically. When applying parallel force, the magnet exhibits significantly lower power (typically approx. 20-30% of maximum force).
  • Wall thickness – the thinner the sheet, the weaker the hold. Magnetic flux penetrates through instead of generating force.
  • Material composition – not every steel attracts identically. Alloy additives worsen the attraction effect.
  • Plate texture – smooth surfaces ensure maximum contact, which improves field saturation. Rough surfaces weaken the grip.
  • Temperature influence – hot environment reduces magnetic field. Exceeding the limit temperature can permanently damage the magnet.

Lifting capacity was measured by applying a steel plate with a smooth surface of suitable thickness (min. 20 mm), under perpendicular detachment force, however under shearing force the holding force is lower. Additionally, even a small distance between the magnet and the plate decreases the lifting capacity.

H&S for magnets
Precision electronics

A powerful magnetic field interferes with the operation of magnetometers in phones and navigation systems. Maintain magnets near a smartphone to avoid damaging the sensors.

Conscious usage

Handle magnets with awareness. Their huge power can surprise even experienced users. Plan your moves and do not underestimate their force.

Beware of splinters

Watch out for shards. Magnets can fracture upon uncontrolled impact, launching sharp fragments into the air. We recommend safety glasses.

Thermal limits

Watch the temperature. Heating the magnet above 80 degrees Celsius will ruin its magnetic structure and strength.

Bodily injuries

Mind your fingers. Two large magnets will join immediately with a force of massive weight, crushing everything in their path. Be careful!

Avoid contact if allergic

Medical facts indicate that nickel (the usual finish) is a strong allergen. If your skin reacts to metals, prevent direct skin contact and choose encased magnets.

Dust explosion hazard

Powder produced during cutting of magnets is flammable. Do not drill into magnets unless you are an expert.

This is not a toy

Absolutely keep magnets away from children. Choking hazard is significant, and the consequences of magnets clamping inside the body are fatal.

Cards and drives

Data protection: Strong magnets can damage payment cards and delicate electronics (pacemakers, medical aids, mechanical watches).

Implant safety

Warning for patients: Strong magnetic fields affect medical devices. Maintain minimum 30 cm distance or ask another person to work with the magnets.

Caution! More info about risks in the article: Magnet Safety Guide.