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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 parameters of the product - 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
Elemental analysis
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
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. Thanks to this, one magnet can perform many functions - sometimes be a hook, and sometimes a holder for a bolt.
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.
For outdoor use (in rain), metal hangers may eventually develop a rusty coating over time. Metal elements can rust with constant contact with atmospheric moisture.

Strengths and weaknesses of Nd2Fe14B magnets.

Pros

Apart from their notable magnetism, neodymium magnets have these key benefits:
  • They do not lose magnetism, even over around ten years – the reduction in strength is only ~1% (theoretically),
  • They retain their magnetic properties even under strong external field,
  • The use of an refined finish of noble metals (nickel, gold, silver) causes the element to present itself better,
  • The surface of neodymium magnets generates a powerful magnetic field – this is one of their assets,
  • Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and can work (depending on the shape) even at a temperature of 230°C or more...
  • Thanks to modularity in constructing and the capacity to modify to unusual requirements,
  • Key role in electronics industry – they are used in data components, motor assemblies, diagnostic systems, also modern systems.
  • Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Weaknesses

Problematic aspects of neodymium magnets: weaknesses and usage proposals
  • They are fragile upon too strong impacts. To avoid cracks, it is worth securing magnets in a protective case. Such protection not only protects the magnet but also improves its resistance to damage
  • We warn that neodymium magnets can reduce their power at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
  • They oxidize in a humid environment - during use outdoors we advise using waterproof magnets e.g. in rubber, plastic
  • We suggest casing - magnetic mount, due to difficulties in producing nuts inside the magnet and complicated forms.
  • Health risk related to microscopic parts of magnets can be dangerous, if swallowed, which gains importance in the context of child health protection. Additionally, small components of these devices are able to complicate diagnosis medical when they are in the body.
  • Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Holding force characteristics

Optimal lifting capacity of a neodymium magnet – what affects it?

The declared magnet strength concerns the maximum value, measured under laboratory conditions, meaning:
  • on a block made of structural steel, optimally conducting the magnetic flux
  • whose transverse dimension equals approx. 10 mm
  • characterized by lack of roughness
  • with direct contact (no paint)
  • during pulling in a direction perpendicular to the mounting surface
  • at ambient temperature approx. 20 degrees Celsius

What influences lifting capacity in practice

Real force is influenced by specific conditions, including (from most important):
  • Distance (betwixt the magnet and the metal), as even a tiny clearance (e.g. 0.5 mm) leads to a decrease in lifting capacity by up to 50% (this also applies to varnish, rust or dirt).
  • Load vector – maximum parameter is obtained only during perpendicular pulling. The shear force of the magnet along the plate is standardly many times lower (approx. 1/5 of the lifting capacity).
  • Metal thickness – thin material does not allow full use of the magnet. Part of the magnetic field passes through the material instead of generating force.
  • Steel type – low-carbon steel gives the best results. Alloy admixtures reduce magnetic permeability and holding force.
  • Base smoothness – the more even the plate, the better the adhesion and stronger the hold. Roughness creates an air distance.
  • Temperature – heating the magnet causes a temporary drop of force. Check the thermal limit for a given model.

Lifting capacity testing was conducted on a smooth plate of optimal thickness, under a perpendicular pulling force, whereas under parallel forces the load capacity is reduced by as much as 5 times. Moreover, even a slight gap between the magnet’s surface and the plate decreases the load capacity.

Safe handling of neodymium magnets
Demagnetization risk

Standard neodymium magnets (N-type) lose magnetization when the temperature surpasses 80°C. Damage is permanent.

Magnetic media

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

Keep away from electronics

A strong magnetic field negatively affects the functioning of compasses in phones and GPS navigation. Keep magnets close to a smartphone to avoid damaging the sensors.

Skin irritation risks

Warning for allergy sufferers: The Ni-Cu-Ni coating consists of nickel. If redness appears, cease handling magnets and use protective gear.

Magnets are brittle

NdFeB magnets are ceramic materials, meaning they are prone to chipping. Clashing of two magnets will cause them cracking into small pieces.

Caution required

Handle magnets with awareness. Their huge power can surprise even experienced users. Be vigilant and respect their power.

Pacemakers

Health Alert: Strong magnets can turn off pacemakers and defibrillators. Stay away if you have electronic implants.

Machining danger

Dust generated during machining of magnets is self-igniting. Do not drill into magnets without proper cooling and knowledge.

Adults only

Absolutely keep magnets out of reach of children. Ingestion danger is significant, and the consequences of magnets clamping inside the body are fatal.

Serious injuries

Protect your hands. Two powerful magnets will join instantly with a force of several hundred kilograms, destroying anything in their path. Exercise extreme caution!

Danger! Looking for details? Check our post: Are neodymium magnets dangerous?