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UMH 42x9x46 [M6] / N38 - magnetic holder with hook

magnetic holder with hook

Catalog no 310429

GTIN/EAN: 5906301814580

5.00

Diameter Ø

42 mm [±1 mm]

Height

46 mm [±1 mm]

Height

9 mm [±1 mm]

Weight

90 g

Magnetization Direction

↑ axial

Load capacity

66.00 kg / 647.24 N

Coating

[NiCuNi] Nickel

product specifications »

35.99 ZŁ with VAT / pcs + price for transport

29.26 ZŁ net + 23% VAT / pcs

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Technical - UMH 42x9x46 [M6] / N38 - magnetic holder with hook

Specification / characteristics - UMH 42x9x46 [M6] / N38 - magnetic holder with hook

properties
properties values
Cat. no. 310429
GTIN/EAN 5906301814580
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 42 mm [±1 mm]
Height 46 mm [±1 mm]
Height 9 mm [±1 mm]
Weight 90 g
Magnetization Direction ↑ axial
Load capacity ~ ? 66.00 kg / 647.24 N
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±1 mm

Magnetic properties of material N38

Specification / characteristics UMH 42x9x46 [M6] / 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 and environmental data
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%
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: 310429-2026
Magnet Unit Converter
Magnet pull force
Field Strength
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Holders with a hook are indispensable in large-format stores and warehouses for suspending advertisements (POS systems). You can use them to organize wires, hang tools, or clothes on metal racks.
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.
The given value defines the maximum load when suspended under a thick, horizontal ceiling beam. If you hang the magnet on a wall, the real capacity is approx. 20-30% of the nominal value.
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.

Strengths

In addition to their magnetic capacity, neodymium magnets provide the following advantages:
  • They have constant strength, and over around 10 years their performance decreases symbolically – ~1% (in testing),
  • They feature excellent resistance to magnetism drop due to external magnetic sources,
  • Thanks to the smooth finish, the plating of nickel, gold, or silver-plated gives an visually attractive appearance,
  • Neodymium magnets create maximum magnetic induction on a small area, which allows for strong attraction,
  • Through (appropriate) combination of ingredients, they can achieve high thermal strength, allowing for action at temperatures reaching 230°C and above...
  • Possibility of exact forming and optimizing to individual requirements,
  • Key role in future technologies – they are commonly used in HDD drives, brushless drives, advanced medical instruments, as well as complex engineering applications.
  • Thanks to concentrated force, small magnets offer high operating force, in miniature format,

Limitations

What to avoid - cons of neodymium magnets and ways of using them
  • At very strong impacts they can crack, therefore we advise placing them in strong housings. 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 recommend our specialized [AH] magnets, which work effectively even at 230°C.
  • When exposed to humidity, magnets usually rust. For applications outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which secure oxidation and corrosion.
  • Due to limitations in realizing threads and complex shapes in magnets, we propose using a housing - magnetic mount.
  • Health risk related to microscopic parts of magnets can be dangerous, if swallowed, which gains importance in the context of child safety. Furthermore, small elements of these devices can disrupt the diagnostic process medical after entering the body.
  • High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which increases costs of application in large quantities

Lifting parameters

Maximum lifting force for a neodymium magnet – what contributes to it?

The force parameter is a theoretical maximum value executed under the following configuration:
  • with the contact of a yoke made of low-carbon steel, ensuring maximum field concentration
  • possessing a thickness of min. 10 mm to avoid saturation
  • with an polished contact surface
  • under conditions of ideal adhesion (surface-to-surface)
  • under vertical force direction (90-degree angle)
  • at room temperature

Lifting capacity in practice – influencing factors

Real force is influenced by specific conditions, including (from most important):
  • Gap (between the magnet and the plate), as even a very small distance (e.g. 0.5 mm) leads to a reduction in force by up to 50% (this also applies to paint, rust or dirt).
  • Pull-off angle – note that the magnet has greatest strength perpendicularly. Under sliding down, the holding force drops significantly, often to levels of 20-30% of the maximum value.
  • Wall thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field penetrates through instead of converting into lifting capacity.
  • Chemical composition of the base – mild steel attracts best. Alloy admixtures lower magnetic properties and holding force.
  • Smoothness – ideal contact is obtained only on smooth steel. Any scratches and bumps create air cushions, reducing force.
  • Heat – NdFeB sinters have a negative temperature coefficient. At higher temperatures they lose power, and at low temperatures they can be stronger (up to a certain limit).

Lifting capacity was determined with the use of a smooth steel plate of suitable thickness (min. 20 mm), under vertically applied force, however under attempts to slide the magnet the lifting capacity is smaller. Moreover, even a small distance between the magnet and the plate reduces the load capacity.

Safety rules for work with neodymium magnets
Do not overheat magnets

Control the heat. Exposing the magnet above 80 degrees Celsius will ruin its properties and pulling force.

Electronic devices

Avoid bringing magnets close to a purse, computer, or TV. The magnetism can destroy these devices and erase data from cards.

Sensitization to coating

Medical facts indicate that the nickel plating (the usual finish) is a common allergen. If you have an allergy, prevent direct skin contact or opt for coated magnets.

Crushing force

Risk of injury: The pulling power is so great that it can cause blood blisters, crushing, and broken bones. Protective gloves are recommended.

Threat to navigation

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

Danger to pacemakers

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

Adults only

Adult use only. Tiny parts can be swallowed, causing severe trauma. Keep away from children and animals.

Safe operation

Be careful. Neodymium magnets attract from a long distance and connect with massive power, often quicker than you can move away.

Do not drill into magnets

Dust produced during machining of magnets is combustible. Do not drill into magnets without proper cooling and knowledge.

Magnets are brittle

Beware of splinters. Magnets can fracture upon uncontrolled impact, launching sharp fragments into the air. Wear goggles.

Attention! More info about hazards in the article: Safety of working with magnets.