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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

technical details »

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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Call us +48 888 99 98 98 if you prefer let us know by means of inquiry form through our site.
Force and appearance of neodymium magnets can be tested using our online calculation tool.

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Technical 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
Engineering data and GPSR
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: 310426-2026
Quick Unit Converter
Force (pull)
Magnetic Induction
Type a value in any box, and all other values change in real-time.

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A hook magnet is an ideal solution for quick mounting of banners, signs, and markings on steel ceiling structures. You can use them to organize wires, hang tools, or clothes on metal racks.
Yes, the hook is an element screwed into a bushing with a metric thread (e.g., M4, M5, M6 - check description). 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. When mounting on a wall (vertically), the holding force is much lower due to shear force (the magnet may slide).
Thanks to the metal cover, attraction force is concentrated, which significantly increases capacity compared to a bare magnet. A bare magnet could crack upon sudden application to metal, and the holder is resistant to this.
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.

Strengths as well as weaknesses of Nd2Fe14B magnets.

Pros

Apart from their notable holding force, neodymium magnets have these key benefits:
  • They virtually do not lose strength, because even after ten years the decline in efficiency is only ~1% (based on calculations),
  • They are noted for resistance to demagnetization induced by presence of other magnetic fields,
  • By applying a smooth layer of silver, the element presents an nice look,
  • The surface of neodymium magnets generates a maximum magnetic field – this is a key feature,
  • Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the shape) even at high temperatures reaching 230°C or more...
  • Thanks to versatility in shaping and the ability to customize to unusual requirements,
  • Versatile presence in advanced technology sectors – they find application in hard drives, brushless drives, medical devices, also complex engineering applications.
  • Relatively small size with high pulling force – neodymium magnets offer high power in tiny dimensions, which enables their usage in small systems

Disadvantages

What to avoid - cons of neodymium magnets and ways of using them
  • They are prone to damage upon too strong impacts. To avoid cracks, it is worth protecting magnets using a steel holder. Such protection not only shields the magnet but also improves its resistance to damage
  • When exposed to high temperature, neodymium magnets suffer a drop in strength. Often, when the temperature exceeds 80°C, their power decreases (depending on the size, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
  • Due to the susceptibility of magnets to corrosion in a humid environment, we recommend using waterproof magnets made of rubber, plastic or other material immune to moisture, when using outdoors
  • We suggest cover - magnetic mechanism, due to difficulties in producing threads inside the magnet and complicated forms.
  • Health risk resulting from small fragments of magnets are risky, if swallowed, which becomes key in the context of child safety. Additionally, small components of these magnets can be problematic in diagnostics medical when they are in the body.
  • With budget limitations the cost of neodymium magnets is economically unviable,

Holding force characteristics

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

The force parameter is a measurement result executed under standard conditions:
  • using a base made of low-carbon steel, acting as a ideal flux conductor
  • whose thickness reaches at least 10 mm
  • with an polished touching surface
  • with zero gap (without coatings)
  • for force acting at a right angle (in the magnet axis)
  • at conditions approx. 20°C

Lifting capacity in practice – influencing factors

Effective lifting capacity is influenced by working environment parameters, such as (from most important):
  • Air gap (between the magnet and the plate), since even a microscopic distance (e.g. 0.5 mm) results in a decrease in lifting capacity by up to 50% (this also applies to paint, corrosion or debris).
  • Angle of force application – highest force is reached only during pulling at a 90° angle. The shear force of the magnet along the surface is typically several times lower (approx. 1/5 of the lifting capacity).
  • Element thickness – for full efficiency, the steel must be adequately massive. Paper-thin metal limits the attraction force (the magnet "punches through" it).
  • Metal type – not every steel reacts the same. High carbon content weaken the attraction effect.
  • Base smoothness – the smoother and more polished the surface, the better the adhesion and stronger the hold. Unevenness creates an air distance.
  • Thermal environment – heating the magnet results in weakening of induction. Check the maximum operating temperature for a given model.

Lifting capacity was determined using a smooth steel plate of optimal thickness (min. 20 mm), under perpendicular detachment force, in contrast under attempts to slide the magnet the holding force is lower. In addition, even a small distance between the magnet and the plate lowers the holding force.

Precautions when working with NdFeB magnets
Medical interference

Individuals with a ICD must keep an absolute distance from magnets. The magnetism can interfere with the operation of the life-saving device.

No play value

Neodymium magnets are not intended for children. Eating a few magnets can lead to them attracting across intestines, which poses a severe health hazard and necessitates urgent medical intervention.

Nickel allergy

A percentage of the population suffer from a sensitization to nickel, which is the typical protective layer for neodymium magnets. Prolonged contact can result in dermatitis. We recommend use safety gloves.

Do not drill into magnets

Combustion risk: Rare earth powder is highly flammable. Do not process magnets in home conditions as this risks ignition.

Risk of cracking

Despite the nickel coating, the material is brittle and cannot withstand shocks. Do not hit, as the magnet may crumble into hazardous fragments.

Safe operation

Handle with care. Rare earth magnets attract from a long distance and connect with massive power, often faster than you can move away.

Precision electronics

Navigation devices and smartphones are highly sensitive to magnetism. Close proximity with a strong magnet can decalibrate the sensors in your phone.

Magnetic media

Equipment safety: Strong magnets can ruin payment cards and sensitive devices (pacemakers, hearing aids, mechanical watches).

Hand protection

Danger of trauma: The attraction force is so immense that it can cause blood blisters, pinching, and even bone fractures. Protective gloves are recommended.

Heat warning

Keep cool. NdFeB magnets are sensitive to heat. If you need operation above 80°C, look for HT versions (H, SH, UH).

Warning! Learn more about hazards in the article: Safety of working with magnets.