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

Product available Ships today (order by 14:00)

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

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14.49 ZŁ with VAT / pcs + price for transport

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Call us now +48 22 499 98 98 alternatively send us a note through contact form through our site.
Strength and shape of neodymium magnets can be checked with our online calculation tool.

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Technical details - 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

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%

Sustainability

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

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A hook magnet is an ideal solution for quick mounting of banners, signs, and markings on steel ceiling structures. You can use them to organize wires, hang tools, or clothes on metal racks.

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.

The cup acts as a magnetic armature, intensifying the neodymium action and increasing efficiency. Additionally, steel protects the brittle magnet from cracking upon hitting the ceiling or beam.

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.

Pros as well as cons of neodymium magnets.

Pros

Besides their exceptional strength, neodymium magnets offer the following advantages:

They do not lose strength, even after nearly 10 years – the reduction in strength is only ~1% (according to tests),
They possess excellent resistance to weakening of magnetic properties as a result of external magnetic sources,
A magnet with a shiny nickel surface has better aesthetics,
Magnetic induction on the surface of the magnet is extremely intense,
Due to their durability and thermal resistance, neodymium magnets can operate (depending on the form) even at high temperatures reaching 230°C or more...
Thanks to freedom in shaping and the ability to customize to unusual requirements,
Universal use in electronics industry – they are utilized in HDD drives, electromotive mechanisms, advanced medical instruments, and industrial machines.
Compactness – despite small sizes they generate large force, making them ideal for precision applications

Limitations

What to avoid - cons of neodymium magnets: weaknesses and usage proposals

To avoid cracks under impact, we suggest using special steel holders. Such a solution secures the magnet and simultaneously improves its durability.
Neodymium magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of power (a factor is the shape and dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are extremely resistant to heat
They oxidize in a humid environment. For use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
We recommend casing - magnetic mount, due to difficulties in creating threads inside the magnet and complex shapes.
Potential hazard resulting from small fragments of magnets pose a threat, when accidentally swallowed, which becomes key in the context of child health protection. Furthermore, small components of these magnets can be problematic in diagnostics medical in case of swallowing.
Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Holding force characteristics

Best holding force of the magnet in ideal parameters – what contributes to it?

The declared magnet strength represents the maximum value, recorded under optimal environment, meaning:

on a block made of structural steel, perfectly concentrating the magnetic flux
possessing a massiveness of at least 10 mm to ensure full flux closure
characterized by lack of roughness
under conditions of no distance (metal-to-metal)
during detachment in a direction perpendicular to the plane
at temperature room level

What influences lifting capacity in practice

During everyday use, the real power results from several key aspects, listed from most significant:

Clearance – the presence of foreign body (paint, tape, air) acts as an insulator, which reduces power rapidly (even by 50% at 0.5 mm).
Force direction – note that the magnet has greatest strength perpendicularly. Under shear forces, the holding force drops significantly, often to levels of 20-30% of the nominal value.
Plate thickness – insufficiently thick plate does not accept the full field, causing part of the flux to be wasted into the air.
Material composition – not every steel reacts the same. Alloy additives weaken the interaction with the magnet.
Smoothness – full contact is obtained only on smooth steel. Rough texture create air cushions, reducing force.
Temperature influence – hot environment weakens magnetic field. Too high temperature can permanently damage the magnet.

Lifting capacity testing was performed on plates with a smooth surface of optimal thickness, under perpendicular forces, however under shearing force the holding force is lower. Moreover, even a small distance between the magnet’s surface and the plate decreases the load capacity.

H&S for magnets

Machining danger

Machining of NdFeB material poses a fire risk. Neodymium dust oxidizes rapidly with oxygen and is difficult to extinguish.

Fragile material

NdFeB magnets are sintered ceramics, which means they are very brittle. Collision of two magnets will cause them breaking into small pieces.

Do not overheat magnets

Do not overheat. Neodymium magnets are sensitive to heat. If you require operation above 80°C, look for HT versions (H, SH, UH).

Safe operation

Handle magnets with awareness. Their immense force can surprise even professionals. Be vigilant and respect their force.

Danger to pacemakers

For implant holders: Powerful magnets disrupt electronics. Keep minimum 30 cm distance or request help to work with the magnets.

Magnetic media

Data protection: Neodymium magnets can ruin data carriers and sensitive devices (pacemakers, medical aids, timepieces).

Nickel allergy

A percentage of the population suffer from a contact allergy to Ni, which is the typical protective layer for NdFeB magnets. Extended handling can result in a rash. We strongly advise wear protective gloves.

Finger safety

Risk of injury: The pulling power is so great that it can cause hematomas, crushing, and even bone fractures. Use thick gloves.

Phone sensors

A powerful magnetic field interferes with the operation of magnetometers in smartphones and navigation systems. Do not bring magnets near a smartphone to prevent damaging the sensors.

Choking Hazard

Adult use only. Small elements pose a choking risk, causing serious injuries. Store out of reach of kids and pets.

Important! More info about hazards in the article: Magnet Safety Guide.

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

Technical details - 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

Sustainability

Force (pull)

Magnetic Field

Other offers

SM 32x125 [2xM8] / N52 - magnetic separator

MPL 15x10x2 / N38 - lamellar magnet

MW 6x2 / N38 - cylindrical magnet

MW 20x18 / N38 - cylindrical magnet

Pros as well as cons of neodymium magnets.

Pros

Limitations

Holding force characteristics

Best holding force of the magnet in ideal parameters – what contributes to it?

What influences lifting capacity in practice

H&S for magnets

Machining danger

Fragile material

Do not overheat magnets

Safe operation

Danger to pacemakers

Magnetic media

Nickel allergy

Finger safety

Phone sensors

Choking Hazard

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C