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UMH 16x5x32 [M4] / N38 - magnetic holder with hook

magnetic holder with hook

Catalog no 310424

GTIN/EAN: 5906301814535

5.00

Diameter Ø

16 mm [±1 mm]

Height

32 mm [±1 mm]

Height

5 mm [±1 mm]

Weight

12 g

Magnetization Direction

↑ axial

Load capacity

7.50 kg / 73.55 N

Coating

[NiCuNi] Nickel

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4.88 ZŁ with VAT / pcs + price for transport

3.97 ZŁ net + 23% VAT / pcs

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Technical data - UMH 16x5x32 [M4] / N38 - magnetic holder with hook

Specification / characteristics - UMH 16x5x32 [M4] / N38 - magnetic holder with hook

properties
properties values
Cat. no. 310424
GTIN/EAN 5906301814535
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 16 mm [±1 mm]
Height 32 mm [±1 mm]
Height 5 mm [±1 mm]
Weight 12 g
Magnetization Direction ↑ axial
Load capacity ~ ? 7.50 kg / 73.55 N
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±1 mm

Magnetic properties of material N38

Specification / characteristics UMH 16x5x32 [M4] / 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%
Sustainability
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: 310424-2026
Measurement Calculator
Magnet pull force
Magnetic Induction
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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 tip is fully demountable - you can unscrew the hook and screw in a bolt, eyelet, or other element in its place. This gives huge application flexibility and allows adapting the holder to current needs.
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. 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. Metal elements can rust with constant contact with atmospheric moisture.

Pros and cons of neodymium magnets.

Benefits

Besides their tremendous pulling force, neodymium magnets offer the following advantages:
  • They virtually do not lose strength, because even after ten years the performance loss is only ~1% (in laboratory conditions),
  • They have excellent resistance to weakening of magnetic properties due to external fields,
  • Thanks to the shimmering finish, the coating of nickel, gold-plated, or silver-plated gives an clean appearance,
  • The surface of neodymium magnets generates a strong magnetic field – this is one of their assets,
  • 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...
  • In view of the potential of free forming and adaptation to individualized needs, NdFeB magnets can be produced in a variety of shapes and sizes, which makes them more universal,
  • Universal use in high-tech industry – they serve a role in hard drives, electric motors, precision medical tools, also complex engineering applications.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in small dimensions, which makes them useful in miniature devices

Cons

Disadvantages of NdFeB magnets:
  • Susceptibility to cracking is one of their disadvantages. Upon strong impact they can break. We recommend keeping them in a special holder, which not only protects them against impacts but also increases their durability
  • When exposed to high temperature, neodymium magnets suffer a drop in force. Often, when the temperature exceeds 80°C, their strength 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 suggest using waterproof magnets made of rubber, plastic or other material immune to moisture, in case of application outdoors
  • We recommend casing - magnetic holder, due to difficulties in producing threads inside the magnet and complex shapes.
  • Health risk to health – tiny shards of magnets can be dangerous, when accidentally swallowed, which gains importance in the context of child safety. Additionally, small elements of these devices are able to be problematic in diagnostics medical after entering the body.
  • High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which hinders application in large quantities

Holding force characteristics

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

The load parameter shown concerns the limit force, measured under optimal environment, specifically:
  • on a base made of structural steel, effectively closing the magnetic flux
  • with a thickness minimum 10 mm
  • with an polished contact surface
  • under conditions of no distance (metal-to-metal)
  • during detachment in a direction perpendicular to the plane
  • at ambient temperature room level

Determinants of lifting force in real conditions

Please note that the working load will differ subject to elements below, in order of importance:
  • Gap between magnet and steel – every millimeter of distance (caused e.g. by varnish or unevenness) significantly weakens the pulling force, often by half at just 0.5 mm.
  • Direction of force – highest force is reached only during perpendicular pulling. The resistance to sliding of the magnet along the plate is usually several times lower (approx. 1/5 of the lifting capacity).
  • Steel thickness – too thin plate does not close the flux, causing part of the power to be escaped into the air.
  • Material composition – not every steel attracts identically. Alloy additives worsen the interaction with the magnet.
  • Base smoothness – the more even the surface, the better the adhesion and higher the lifting capacity. Roughness creates an air distance.
  • Thermal conditions – neodymium magnets have a negative temperature coefficient. At higher temperatures they lose power, and at low temperatures 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 holding force is lower. In addition, even a minimal clearance between the magnet and the plate lowers the lifting capacity.

Precautions when working with neodymium magnets
Health Danger

Life threat: Strong magnets can deactivate heart devices and defibrillators. Stay away if you have medical devices.

Fragile material

Neodymium magnets are sintered ceramics, meaning they are very brittle. Collision of two magnets will cause them cracking into shards.

Allergy Warning

Medical facts indicate that the nickel plating (standard magnet coating) is a potent allergen. If you have an allergy, prevent direct skin contact and choose versions in plastic housing.

No play value

These products are not intended for children. Accidental ingestion of a few magnets may result in them pinching intestinal walls, which poses a direct threat to life and necessitates urgent medical intervention.

Maximum temperature

Standard neodymium magnets (grade N) lose magnetization when the temperature goes above 80°C. Damage is permanent.

Impact on smartphones

A powerful magnetic field interferes with the operation of compasses in smartphones and navigation systems. Maintain magnets close to a device to avoid damaging the sensors.

Dust explosion hazard

Drilling and cutting of NdFeB material poses a fire risk. Neodymium dust reacts violently with oxygen and is difficult to extinguish.

Crushing force

Pinching hazard: The pulling power is so immense that it can result in blood blisters, pinching, and even bone fractures. Use thick gloves.

Immense force

Use magnets consciously. Their immense force can shock even experienced users. Stay alert and do not underestimate their power.

Safe distance

Avoid bringing magnets close to a wallet, laptop, or TV. The magnetic field can destroy these devices and wipe information from cards.

Caution! Looking for details? Read our article: Are neodymium magnets dangerous?