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

magnetic holder with hook

Catalog no 310426

GTIN/EAN: 5906301814559

5.00

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

check properties »

14.49 ZŁ with VAT / pcs + price for transport

11.78 ZŁ net + 23% VAT / pcs

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Detailed specification - 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
Engineering data and GPSR
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%
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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Pulling force
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They serve to create mobile suspension points without the need to drill holes in beams. In workshops and garages, they work perfectly for guiding cables or hanging work lighting.
Yes, the hook is an element screwed into a bushing with a metric thread (e.g., M4, M5, M6 - check description). Check the thread size in the product specification to select matching replacements.
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 steel housing (cup) shields the magnetic field, directing all its power downwards, onto the contact surface. Additionally, steel protects the brittle magnet from cracking upon hitting the ceiling or beam.
In the bathroom or kitchen, they will work perfectly, provided they are not directly splashed with water. In home and office conditions, they will serve for many years without signs of wear.

Advantages as well as disadvantages of Nd2Fe14B magnets.

Pros

Apart from their strong holding force, neodymium magnets have these key benefits:
  • They virtually do not lose strength, because even after ten years the performance loss is only ~1% (according to literature),
  • They have excellent resistance to magnetic field loss as a result of external magnetic sources,
  • A magnet with a shiny nickel surface has an effective appearance,
  • They show high magnetic induction at the operating surface, which affects their effectiveness,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
  • Considering the option of free molding and adaptation to individualized requirements, neodymium magnets can be manufactured in a wide range of forms and dimensions, which makes them more universal,
  • Significant place in advanced technology sectors – they serve a role in mass storage devices, electric motors, precision medical tools, and modern systems.
  • Thanks to concentrated force, small magnets offer high operating force, occupying minimum space,

Cons

Disadvantages of neodymium magnets:
  • At strong impacts they can break, therefore we advise placing them in special holders. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
  • They oxidize in a humid environment - during use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
  • We recommend cover - magnetic mechanism, due to difficulties in realizing nuts inside the magnet and complex shapes.
  • Potential hazard resulting from small fragments of magnets are risky, when accidentally swallowed, which is particularly important in the context of child safety. It is also worth noting that small components of these magnets are able to be problematic in diagnostics medical after entering the body.
  • Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Pull force analysis

Maximum holding power of the magnet – what it depends on?

Magnet power was defined for ideal contact conditions, taking into account:
  • using a base made of low-carbon steel, acting as a circuit closing element
  • possessing a massiveness of minimum 10 mm to ensure full flux closure
  • with a plane perfectly flat
  • under conditions of gap-free contact (metal-to-metal)
  • under perpendicular application of breakaway force (90-degree angle)
  • in temp. approx. 20°C

Magnet lifting force in use – key factors

Effective lifting capacity is influenced by specific conditions, including (from most important):
  • Clearance – the presence of any layer (paint, tape, air) acts as an insulator, which reduces capacity rapidly (even by 50% at 0.5 mm).
  • Force direction – note that the magnet has greatest strength perpendicularly. Under sliding down, the capacity drops significantly, often to levels of 20-30% of the maximum value.
  • Substrate thickness – for full efficiency, the steel must be adequately massive. Thin sheet limits the lifting capacity (the magnet "punches through" it).
  • Material type – ideal substrate is high-permeability steel. Cast iron may attract less.
  • Surface finish – full contact is obtained only on polished steel. Any scratches and bumps reduce the real contact area, reducing force.
  • Heat – neodymium magnets have a sensitivity to temperature. When it is hot they are weaker, and in frost gain strength (up to a certain limit).

Lifting capacity testing was performed on plates with a smooth surface of optimal thickness, under perpendicular forces, whereas under parallel forces the load capacity is reduced by as much as 75%. Additionally, even a minimal clearance between the magnet and the plate decreases the load capacity.

Safety rules for work with NdFeB magnets
This is not a toy

Neodymium magnets are not suitable for play. Accidental ingestion of multiple magnets may result in them attracting across intestines, which constitutes a severe health hazard and necessitates immediate surgery.

Power loss in heat

Monitor thermal conditions. Heating the magnet above 80 degrees Celsius will destroy its properties and pulling force.

Pacemakers

Health Alert: Strong magnets can deactivate heart devices and defibrillators. Do not approach if you have medical devices.

Phone sensors

Navigation devices and smartphones are extremely sensitive to magnetic fields. Direct contact with a strong magnet can ruin the sensors in your phone.

Fire warning

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

Data carriers

Device Safety: Neodymium magnets can ruin data carriers and delicate electronics (pacemakers, medical aids, mechanical watches).

Magnets are brittle

Watch out for shards. Magnets can fracture upon uncontrolled impact, launching shards into the air. Eye protection is mandatory.

Bone fractures

Large magnets can crush fingers instantly. Under no circumstances place your hand betwixt two strong magnets.

Immense force

Handle magnets with awareness. Their immense force can surprise even professionals. Plan your moves and do not underestimate their power.

Sensitization to coating

Studies show that the nickel plating (the usual finish) is a potent allergen. For allergy sufferers, avoid touching magnets with bare hands or opt for versions in plastic housing.

Important! Details about risks in the article: Magnet Safety Guide.