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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

technical details »

4.88 ZŁ with VAT / pcs + price for transport

3.97 ZŁ net + 23% VAT / pcs

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Technical - 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
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A hook magnet is an ideal solution for quick mounting of banners, signs, and markings on steel ceiling structures. It is a universal hanger that you can move to another place at any time without a trace.
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., 7.50 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.

Advantages as well as disadvantages of Nd2Fe14B magnets.

Benefits

Besides their immense magnetic power, neodymium magnets offer the following advantages:
  • Their power remains stable, and after around 10 years it decreases only by ~1% (theoretically),
  • They maintain their magnetic properties even under strong external field,
  • By covering with a shiny layer of nickel, the element has an professional look,
  • Magnetic induction on the working part of the magnet turns out to be strong,
  • Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and can work (depending on the form) even at a temperature of 230°C or more...
  • Possibility of precise creating and modifying to defined conditions,
  • Huge importance in advanced technology sectors – they are used in computer drives, brushless drives, medical equipment, also modern systems.
  • Thanks to efficiency per cm³, small magnets offer high operating force, in miniature format,

Cons

Disadvantages of NdFeB magnets:
  • At very strong impacts they can break, therefore we recommend placing them in steel cases. A metal housing provides additional protection against damage and increases the magnet's durability.
  • When exposed to high temperature, neodymium magnets experience a drop in power. 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
  • When exposed to humidity, magnets start to rust. For applications outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which secure oxidation as well as corrosion.
  • Limited ability of making threads in the magnet and complicated shapes - recommended is a housing - magnet mounting.
  • Potential hazard resulting from small fragments of magnets pose a threat, if swallowed, which gains importance in the context of child health protection. Additionally, small elements of these products can complicate diagnosis medical when they are in the body.
  • Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Holding force characteristics

Maximum holding power of the magnet – what affects it?

The specified lifting capacity refers to the limit force, recorded under ideal test conditions, specifically:
  • on a base made of mild steel, perfectly concentrating the magnetic field
  • with a thickness of at least 10 mm
  • with a surface perfectly flat
  • with direct contact (without coatings)
  • for force acting at a right angle (pull-off, not shear)
  • at temperature room level

Lifting capacity in practice – influencing factors

During everyday use, the actual holding force depends on a number of factors, presented from crucial:
  • Distance (betwixt the magnet and the plate), because even a very small clearance (e.g. 0.5 mm) results in a decrease in force by up to 50% (this also applies to varnish, rust or dirt).
  • Loading method – declared lifting capacity refers to pulling vertically. When attempting to slide, the magnet holds much less (typically 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 generating force.
  • Material composition – different alloys reacts the same. Alloy additives weaken the attraction effect.
  • Surface finish – ideal contact is obtained only on smooth steel. Rough texture reduce the real contact area, reducing force.
  • Operating temperature – NdFeB sinters have a negative temperature coefficient. When it is hot they lose power, and in frost they can be stronger (up to a certain limit).

Lifting capacity testing was performed on a smooth plate of suitable thickness, under a perpendicular pulling force, however under parallel forces 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
This is not a toy

Only for adults. Small elements pose a choking risk, leading to severe trauma. Keep out of reach of children and animals.

Finger safety

Pinching hazard: The attraction force is so great that it can cause blood blisters, pinching, and even bone fractures. Use thick gloves.

Thermal limits

Keep cool. Neodymium magnets are susceptible to temperature. If you require operation above 80°C, inquire about special high-temperature series (H, SH, UH).

Respect the power

Before starting, read the rules. Sudden snapping can break the magnet or hurt your hand. Be predictive.

Metal Allergy

Studies show that the nickel plating (the usual finish) is a strong allergen. For allergy sufferers, prevent direct skin contact and select encased magnets.

Phone sensors

Navigation devices and mobile phones are extremely sensitive to magnetism. Close proximity with a powerful NdFeB magnet can permanently damage the internal compass in your phone.

Electronic hazard

Intense magnetic fields can destroy records on payment cards, hard drives, and storage devices. Stay away of at least 10 cm.

Flammability

Drilling and cutting of NdFeB material poses a fire hazard. Magnetic powder oxidizes rapidly with oxygen and is difficult to extinguish.

Pacemakers

For implant holders: Strong magnetic fields affect medical devices. Maintain at least 30 cm distance or ask another person to work with the magnets.

Protective goggles

Despite the nickel coating, neodymium is brittle and cannot withstand shocks. Avoid impacts, as the magnet may shatter into hazardous fragments.

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