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

magnetic holder with hook

Catalog no 310425

GTIN/EAN: 5906301814542

5.00
Load capacity 14.50 kg / 142.20 N
Diameter Ø
20 mm [±1 mm]
Height
35 mm [±1 mm]
Height
7 mm [±1 mm]
Weight
21 g
Magnetization Direction
↑ axial
Coating
[NiCuNi] Nickel
see specifications »

8.59 zł with VAT / pcs + price for transport

6.98 zł net + 23% VAT / pcs

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Technical data - 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
Measurement Calculator

Force (pull)

Magnetic Induction

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They serve to create mobile suspension points without the need to drill holes in beams. In workshops and garages, they work perfectly for guiding cables or hanging work lighting.
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.
You will get the greatest force by mounting the magnet on a thick, smooth steel surface vertically. 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. Additionally, steel protects the brittle magnet from cracking upon hitting the ceiling or beam.
In the bathroom or kitchen, they will work perfectly, provided they are not directly splashed with water. If you are looking for an outdoor hanger, choose a model in rubberized or plastic housing, which is tight.

Advantages and disadvantages of rare earth magnets.

Pros

Besides their magnetic performance, neodymium magnets are valued for these benefits:
  • They retain magnetic properties for almost 10 years – the loss is just ~1% (based on simulations),
  • They show high resistance to demagnetization induced by external field influence,
  • Thanks to the smooth finish, the layer of Ni-Cu-Ni, gold-plated, or silver gives an aesthetic appearance,
  • They show high magnetic induction at the operating surface, making them more effective,
  • Through (appropriate) combination of ingredients, they can achieve high thermal resistance, enabling action at temperatures approaching 230°C and above...
  • Possibility of individual forming and adjusting to individual needs,
  • Key role in high-tech industry – they are commonly used in computer drives, electric motors, precision medical tools, as well as industrial machines.
  • Thanks to efficiency per cm³, small magnets offer high operating force, occupying minimum space,

Cons

What to avoid - cons of neodymium magnets and proposals for their use:
  • Susceptibility to cracking is one of their disadvantages. Upon strong impact they can break. We advise keeping them in a steel housing, which not only protects them against impacts but also raises their durability
  • When exposed to high temperature, neodymium magnets experience a drop in strength. Often, when the temperature exceeds 80°C, their power decreases (depending on the size and 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. To use them in conditions outside, it is recommended to use protective magnets, such as those in rubber or plastics, which secure oxidation as well as corrosion.
  • We suggest casing - magnetic mechanism, due to difficulties in creating threads inside the magnet and complicated shapes.
  • Possible danger related to microscopic parts of magnets can be dangerous, when accidentally swallowed, which gains importance in the aspect of protecting the youngest. Furthermore, tiny parts of these magnets can disrupt the diagnostic process medical when they are in the body.
  • With budget limitations the cost of neodymium magnets can be a barrier,

Holding force characteristics

Highest magnetic holding force – what affects it?

The force parameter is a measurement result executed under specific, ideal conditions:
  • with the contact of a yoke made of special test steel, guaranteeing full magnetic saturation
  • whose transverse dimension reaches at least 10 mm
  • with a surface perfectly flat
  • with direct contact (without coatings)
  • under perpendicular force direction (90-degree angle)
  • at ambient temperature room level

Determinants of lifting force in real conditions

It is worth knowing that the application force may be lower influenced by elements below, starting with the most relevant:
  • Clearance – existence of any layer (rust, dirt, air) acts as an insulator, which lowers capacity rapidly (even by 50% at 0.5 mm).
  • Force direction – catalog parameter refers to pulling vertically. When applying parallel force, the magnet exhibits significantly lower power (typically approx. 20-30% of maximum force).
  • Base massiveness – insufficiently thick steel does not close the flux, causing part of the flux to be escaped to the other side.
  • Material type – the best choice is pure iron steel. Stainless steels may attract less.
  • Surface finish – ideal contact is possible only on smooth steel. Any scratches and bumps create air cushions, reducing force.
  • Thermal environment – temperature increase causes a temporary drop of induction. Check the thermal limit for a given model.

Holding force was measured on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, whereas under attempts to slide the magnet the holding force is lower. Moreover, even a slight gap between the magnet and the plate lowers the load capacity.

Safe handling of NdFeB magnets
Respect the power

Be careful. Rare earth magnets act from a long distance and snap with massive power, often faster than you can move away.

Thermal limits

Standard neodymium magnets (grade N) undergo demagnetization when the temperature exceeds 80°C. The loss of strength is permanent.

Medical interference

Health Alert: Neodymium magnets can deactivate pacemakers and defibrillators. Do not approach if you have electronic implants.

Machining danger

Powder generated during cutting of magnets is combustible. Do not drill into magnets without proper cooling and knowledge.

Fragile material

Despite metallic appearance, the material is brittle and not impact-resistant. Avoid impacts, as the magnet may crumble into hazardous fragments.

Swallowing risk

Always store magnets away from children. Risk of swallowing is high, and the consequences of magnets clamping inside the body are tragic.

Metal Allergy

Medical facts indicate that the nickel plating (the usual finish) is a strong allergen. For allergy sufferers, refrain from direct skin contact and select coated magnets.

Crushing force

Big blocks can crush fingers in a fraction of a second. Under no circumstances put your hand between two strong magnets.

GPS Danger

GPS units and mobile phones are highly sensitive to magnetism. Close proximity with a strong magnet can permanently damage the internal compass in your phone.

Electronic devices

Very strong magnetic fields can erase data on payment cards, hard drives, and storage devices. Keep a distance of at least 10 cm.

Security! Need more info? Check our post: Are neodymium magnets dangerous?