UMH 25x8x45 [M5] / N38 - magnetic holder with hook

Product available Ships tomorrow

UMH 25x8x45 [M5] / N38 - magnetic holder with hook

Name: Dhit sp. z o.o.
Address: Kościuszki 6A, Ożarów Mazowiecki, Poland, 05-850, PL
Telephone: +48 22 499 98 98
Price range: PLN 1-6500
Rating: 5

magnetic holder with hook

Catalog no 310426

GTIN/EAN: 5906301814559

5.00

Diameter Ø

25 mm [±1 mm]

Height

45 mm [±1 mm]

Height

8 mm [±1 mm]

Weight

33 g

Magnetization Direction

↑ axial

Load capacity

25.00 kg / 245.17 N

Coating

[NiCuNi] Nickel

technical specifications »

14.49 ZŁ with VAT / pcs + price for transport

11.78 ZŁ net + 23% VAT / pcs

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Carbon Footprint – environmental impact GPSR Regulation – product safety

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Product card - UMH 25x8x45 [M5] / N38 - magnetic holder with hook

Specification / characteristics - UMH 25x8x45 [M5] / N38 - magnetic holder with hook

properties

properties	values
Cat. no.	310426
GTIN/EAN	5906301814559
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	25 mm [±1 mm]
Height	45 mm [±1 mm]
Height	8 mm [±1 mm]
Weight	33 g
Magnetization Direction	↑ axial
Load capacity ~ ?	25.00 kg / 245.17 N
Coating	[NiCuNi] Nickel
Manufacturing Tolerance	±1 mm

Magnetic properties of material N38

Specification / characteristics UMH 25x8x45 [M5] / 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

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%

Ecology and recycling (GPSR)

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: 310426-2026

Quick Unit Converter

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Force (N)

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MPL 35x35x10 / N38 - lamellar magnet

35.10 ZŁ brutto / pcs

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34.44 ZŁ brutto / pcs

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MPL 20x10x5 / N38 - lamellar magnet

4.54 ZŁ brutto / pcs

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MP 5x2.7/1.2x5 Z / N38 - ring magnet

0.836 ZŁ brutto / pcs

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). This gives huge application flexibility and allows adapting the holder to current needs.

The nominal capacity (e.g., 25.00 kg) refers to perpendicular (vertical) force when mounted on the ceiling. 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. 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. In home and office conditions, they will serve for many years without signs of wear.

Advantages and disadvantages of neodymium magnets.

Advantages

Besides their durability, neodymium magnets are valued for these benefits:

They retain full power for almost 10 years – the drop is just ~1% (according to analyses),
They possess excellent resistance to magnetism drop as a result of external magnetic sources,
In other words, due to the reflective layer of nickel, the element gains visual value,
The surface of neodymium magnets generates a powerful magnetic field – this is a key feature,
Through (adequate) combination of ingredients, they can achieve high thermal strength, allowing for operation at temperatures reaching 230°C and above...
In view of the ability of free forming and customization to unique needs, magnetic components can be modeled in a variety of geometric configurations, which increases their versatility,
Huge importance in future technologies – they find application in data components, electric motors, medical devices, also technologically advanced constructions.
Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Disadvantages

What to avoid - cons of neodymium magnets: application proposals

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 increases their durability
Neodymium magnets lose their force under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. 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 advise using waterproof magnets made of rubber, plastic or other material immune to moisture, when using outdoors
Limited possibility of making nuts in the magnet and complicated forms - recommended is casing - mounting mechanism.
Health risk to health – tiny shards of magnets pose a threat, if swallowed, which becomes key in the aspect of protecting the youngest. Additionally, tiny parts of these magnets can complicate diagnosis medical in case of swallowing.
High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which can limit application in large quantities

Holding force characteristics

Maximum lifting capacity of the magnet – what it depends on?

Breakaway force was determined for ideal contact conditions, including:

with the application of a sheet made of special test steel, ensuring maximum field concentration
whose transverse dimension is min. 10 mm
with a plane free of scratches
under conditions of ideal adhesion (metal-to-metal)
for force acting at a right angle (in the magnet axis)
in neutral thermal conditions

Determinants of lifting force in real conditions

Please note that the application force will differ subject to the following factors, in order of importance:

Distance – the presence of any layer (paint, dirt, air) interrupts the magnetic circuit, which lowers capacity steeply (even by 50% at 0.5 mm).
Loading method – catalog parameter refers to pulling vertically. When attempting to slide, the magnet holds significantly lower power (typically approx. 20-30% of maximum force).
Element thickness – to utilize 100% power, the steel must be adequately massive. Thin sheet limits the lifting capacity (the magnet "punches through" it).
Material composition – different alloys reacts the same. Alloy additives weaken the attraction effect.
Plate texture – ground elements ensure maximum contact, which improves force. Uneven metal weaken the grip.
Temperature influence – high temperature weakens pulling force. Too high temperature can permanently demagnetize the magnet.

Holding force was tested on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, however under shearing force the load capacity is reduced by as much as fivefold. Additionally, even a slight gap between the magnet and the plate decreases the lifting capacity.

Safety rules for work with neodymium magnets

Adults only

Strictly keep magnets out of reach of children. Risk of swallowing is high, and the effects of magnets clamping inside the body are very dangerous.

Risk of cracking

Despite the nickel coating, neodymium is delicate and cannot withstand shocks. Do not hit, as the magnet may shatter into sharp, dangerous pieces.

Warning for heart patients

People with a pacemaker should keep an large gap from magnets. The magnetic field can stop the operation of the implant.

Safe distance

Powerful magnetic fields can erase data on credit cards, HDDs, and other magnetic media. Stay away of at least 10 cm.

Respect the power

Handle magnets consciously. Their powerful strength can shock even experienced users. Plan your moves and respect their force.

GPS and phone interference

GPS units and mobile phones are extremely susceptible to magnetic fields. Direct contact with a strong magnet can decalibrate the sensors in your phone.

Fire warning

Combustion risk: Rare earth powder is explosive. Avoid machining magnets without safety gear as this risks ignition.

Sensitization to coating

Studies show that nickel (standard magnet coating) is a potent allergen. For allergy sufferers, prevent touching magnets with bare hands and select coated magnets.

Bone fractures

Risk of injury: The pulling power is so immense that it can result in hematomas, crushing, and broken bones. Protective gloves are recommended.

Heat warning

Do not overheat. Neodymium magnets are sensitive to temperature. If you need operation above 80°C, inquire about HT versions (H, SH, UH).

Security! Details about risks in the article: Magnet Safety Guide.

UMH 25x8x45 [M5] / N38 - magnetic holder with hook

Product card - UMH 25x8x45 [M5] / N38 - magnetic holder with hook

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Chemical composition

Ecology and recycling (GPSR)

Force (pull)

Field Strength

See also deals

MPL 35x35x10 / N38 - lamellar magnet

KM HF - 34,5 kg - magnetic bracket

MPL 20x10x5 / N38 - lamellar magnet

MP 5x2.7/1.2x5 Z / N38 - ring magnet

Advantages and disadvantages of neodymium magnets.

Advantages

Disadvantages

Holding force characteristics

Maximum lifting capacity of the magnet – what it depends on?

Determinants of lifting force in real conditions

Safety rules for work with neodymium magnets

Adults only

Risk of cracking

Warning for heart patients

Safe distance

Respect the power

GPS and phone interference

Fire warning

Sensitization to coating

Bone fractures

Heat warning

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C