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UMH 20x7x35 [M4] / N38 - magnetic holder with hook

magnetic holder with hook

Catalog no 310425

GTIN/EAN: 5906301814542

5.00

Diameter Ø

20 mm [±1 mm]

Height

35 mm [±1 mm]

Height

7 mm [±1 mm]

Weight

21 g

Magnetization Direction

↑ axial

Load capacity

14.50 kg / 142.20 N

Coating

[NiCuNi] Nickel

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8.59 ZŁ with VAT / pcs + price for transport

6.98 ZŁ net + 23% VAT / pcs

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Technical details - UMH 20x7x35 [M4] / N38 - magnetic holder with hook

Specification / characteristics - UMH 20x7x35 [M4] / N38 - magnetic holder with hook

properties
properties values
Cat. no. 310425
GTIN/EAN 5906301814542
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 20 mm [±1 mm]
Height 35 mm [±1 mm]
Height 7 mm [±1 mm]
Weight 21 g
Magnetization Direction ↑ axial
Load capacity ~ ? 14.50 kg / 142.20 N
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±1 mm

Magnetic properties of material N38

Specification / characteristics UMH 20x7x35 [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
Technical specification and ecology
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: 310425-2026
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They serve to create mobile suspension points without the need to drill holes in beams. It is a universal hanger that you can move to another place at any time without a trace.
The magnet has a standard threaded socket, which allows replacing the hook with any other accessory with a thread. This gives huge application flexibility and allows adapting the holder to current needs.
The nominal capacity (e.g., 14.50 kg) refers to perpendicular (vertical) force when mounted on the ceiling. For heavy ceiling ads or tools, we recommend choosing a magnet with a considerable power reserve.
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.
Standard holders are coated with a layer of nickel or zinc, which protects them from corrosion indoors. Metal elements can rust with constant contact with atmospheric moisture.

Pros as well as cons of Nd2Fe14B magnets.

Strengths

Besides their tremendous field intensity, neodymium magnets offer the following advantages:
  • They retain attractive force for almost 10 years – the drop is just ~1% (in theory),
  • Neodymium magnets are characterized by remarkably resistant to demagnetization caused by external magnetic fields,
  • Thanks to the reflective finish, the surface of nickel, gold, or silver-plated gives an aesthetic appearance,
  • Magnets exhibit exceptionally strong magnetic induction on the active area,
  • Thanks to resistance to high temperature, they are capable of working (depending on the form) even at temperatures up to 230°C and higher...
  • Possibility of accurate machining as well as modifying to defined applications,
  • Universal use in modern technologies – they are utilized in HDD drives, motor assemblies, precision medical tools, as well as complex engineering applications.
  • Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Cons

Drawbacks and weaknesses of neodymium magnets: weaknesses and usage proposals
  • To avoid cracks upon strong impacts, we suggest using special steel holders. Such a solution protects the magnet and simultaneously increases its durability.
  • Neodymium magnets decrease their power under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures 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 mechanism, due to difficulties in producing nuts inside the magnet and complicated shapes.
  • Potential hazard related to microscopic parts of magnets pose a threat, when accidentally swallowed, which is particularly important in the context of child safety. Furthermore, tiny parts of these devices can disrupt the diagnostic process medical in case of swallowing.
  • High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which can limit application in large quantities

Lifting parameters

Breakaway strength of the magnet in ideal conditions – what it depends on?

Information about lifting capacity was defined for the most favorable conditions, assuming:
  • with the contact of a yoke made of low-carbon steel, guaranteeing maximum field concentration
  • possessing a massiveness of minimum 10 mm to ensure full flux closure
  • with a surface perfectly flat
  • with zero gap (without impurities)
  • for force applied at a right angle (pull-off, not shear)
  • at standard ambient temperature

Lifting capacity in real conditions – factors

Real force impacted by working environment parameters, including (from priority):
  • Gap (betwixt the magnet and the plate), since even a very small clearance (e.g. 0.5 mm) can cause a decrease in force by up to 50% (this also applies to paint, corrosion or debris).
  • Load vector – maximum parameter is reached only during pulling at a 90° angle. The resistance to sliding of the magnet along the plate is typically several times lower (approx. 1/5 of the lifting capacity).
  • Steel thickness – too thin sheet causes magnetic saturation, causing part of the power to be wasted into the air.
  • Steel grade – the best choice is pure iron steel. Stainless steels may have worse magnetic properties.
  • Surface quality – the more even the plate, the better the adhesion and stronger the hold. Roughness acts like micro-gaps.
  • Temperature influence – hot environment reduces pulling force. Too high temperature can permanently damage the magnet.

Holding force was measured on the plate surface of 20 mm thickness, when a perpendicular force was applied, whereas under attempts to slide the magnet the holding force is lower. Additionally, even a minimal clearance between the magnet and the plate reduces the load capacity.

Safety rules for work with neodymium magnets
Risk of cracking

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

Dust is flammable

Powder generated during machining of magnets is combustible. Do not drill into magnets unless you are an expert.

Caution required

Before use, read the rules. Sudden snapping can destroy the magnet or injure your hand. Be predictive.

Bodily injuries

Large magnets can crush fingers instantly. Never put your hand between two attracting surfaces.

Safe distance

Data protection: Strong magnets can ruin payment cards and sensitive devices (heart implants, hearing aids, mechanical watches).

Metal Allergy

Allergy Notice: The nickel-copper-nickel coating consists of nickel. If an allergic reaction appears, cease handling magnets and wear gloves.

Choking Hazard

Neodymium magnets are not toys. Swallowing several magnets can lead to them connecting inside the digestive tract, which poses a severe health hazard and requires urgent medical intervention.

Warning for heart patients

Warning for patients: Powerful magnets disrupt electronics. Maintain at least 30 cm distance or request help to work with the magnets.

Thermal limits

Regular neodymium magnets (grade N) lose magnetization when the temperature surpasses 80°C. This process is irreversible.

GPS Danger

Remember: neodymium magnets produce a field that confuses precision electronics. Keep a separation from your phone, device, and GPS.

Attention! Need more info? Read our article: Are neodymium magnets dangerous?
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98