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

technical details »

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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Lifting power along with shape of magnets can be checked on our magnetic mass calculator.

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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

Technical and environmental data

Material specification

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: 310426-2026

Magnet Unit Converter

Magnet pull force

Pounds (lbs)

Field Strength

Gauss (Gs)

Induction (T)

Type data in one of the inputs, to see the rest convert on the fly.

MW 2x4 / N38 - cylindrical magnet

0.209 ZŁ brutto / pcs

Product available Ships today (order by 14:00)

MW 3x2 / N38 - cylindrical magnet

0.1476 ZŁ brutto / pcs

Product available Ships today (order by 14:00)

MPL 7x7x3 / N38 - lamellar magnet

0.541 ZŁ brutto / pcs

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SMZR 25x250 / N52 - magnetic separator with handle

676.50 ZŁ brutto / pcs

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.

The tip is fully demountable - you can unscrew the hook and screw in a bolt, eyelet, or other element in its place. This gives huge application flexibility and allows adapting the holder to current needs.

The given value defines the maximum load when suspended under a thick, horizontal ceiling beam. When mounting on a wall (vertically), the holding force is much lower due to shear force (the magnet may slide).

The cup acts as a magnetic armature, intensifying the neodymium action and increasing efficiency. 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.

Strengths and weaknesses of neodymium magnets.

Advantages

In addition to their magnetic efficiency, neodymium magnets provide the following advantages:

They do not lose magnetism, even during around 10 years – the drop in power is only ~1% (theoretically),
They maintain their magnetic properties even under close interference source,
A magnet with a metallic silver surface looks better,
Neodymium magnets generate maximum magnetic induction on a contact point, which allows for strong attraction,
Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their shape) at temperatures up to 230°C and above...
Due to the ability of free molding and adaptation to individualized projects, magnetic components can be modeled in a broad palette of forms and dimensions, which increases their versatility,
Wide application in advanced technology sectors – they are commonly used in magnetic memories, drive modules, diagnostic systems, and multitasking production systems.
Thanks to efficiency per cm³, small magnets offer high operating force, with minimal size,

Cons

Disadvantages of neodymium magnets:

At strong impacts they can break, therefore we advise placing them in special holders. A metal housing provides additional protection against damage and increases the magnet's durability.
NdFeB magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of strength (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 very resistant to heat
When exposed to humidity, magnets start to rust. For applications outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which secure oxidation and corrosion.
Limited possibility of making threads in the magnet and complicated shapes - preferred is a housing - mounting mechanism.
Health risk resulting from small fragments of magnets can be dangerous, when accidentally swallowed, which gains importance in the context of child safety. Additionally, small elements of these magnets can be problematic in diagnostics medical when they are in the body.
High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which hinders application in large quantities

Holding force characteristics

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

Magnet power is the result of a measurement for ideal contact conditions, taking into account:

using a sheet made of low-carbon steel, acting as a circuit closing element
with a thickness of at least 10 mm
with a surface perfectly flat
under conditions of no distance (metal-to-metal)
during detachment in a direction perpendicular to the mounting surface
at ambient temperature room level

Determinants of practical lifting force of a magnet

In real-world applications, the actual lifting capacity depends on a number of factors, presented from most significant:

Distance (betwixt the magnet and the plate), because even a microscopic distance (e.g. 0.5 mm) results in a reduction in lifting capacity by up to 50% (this also applies to paint, rust or dirt).
Loading method – catalog parameter refers to detachment vertically. When applying parallel force, the magnet exhibits significantly lower power (typically approx. 20-30% of maximum force).
Metal thickness – thin material does not allow full use of the magnet. Magnetic flux passes through the material instead of converting into lifting capacity.
Chemical composition of the base – mild steel attracts best. Alloy steels lower magnetic properties and holding force.
Base smoothness – the more even the surface, the larger the contact zone and higher the lifting capacity. Roughness creates an air distance.
Temperature – heating the magnet causes a temporary drop of force. Check the maximum operating temperature for a given model.

Holding force was tested on the plate surface of 20 mm thickness, when the force acted perpendicularly, whereas under attempts to slide the magnet the load capacity is reduced by as much as 75%. In addition, even a minimal clearance between the magnet and the plate lowers the load capacity.

Warnings

Metal Allergy

Certain individuals have a contact allergy to Ni, which is the standard coating for NdFeB magnets. Extended handling may cause dermatitis. It is best to wear protective gloves.

Impact on smartphones

Note: rare earth magnets generate a field that disrupts sensitive sensors. Maintain a separation from your mobile, device, and GPS.

Respect the power

Be careful. Rare earth magnets act from a distance and connect with huge force, often faster than you can react.

Keep away from children

These products are not suitable for play. Accidental ingestion of multiple magnets can lead to them attracting across intestines, which constitutes a severe health hazard and necessitates immediate surgery.

Danger to pacemakers

Patients with a pacemaker should maintain an safe separation from magnets. The magnetic field can stop the functioning of the life-saving device.

Shattering risk

Watch out for shards. Magnets can fracture upon violent connection, launching sharp fragments into the air. Eye protection is mandatory.

Keep away from computers

Equipment safety: Strong magnets can damage payment cards and delicate electronics (pacemakers, medical aids, timepieces).

Dust explosion hazard

Dust produced during cutting of magnets is combustible. Do not drill into magnets unless you are an expert.

Bone fractures

Watch your fingers. Two large magnets will snap together instantly with a force of several hundred kilograms, destroying anything in their path. Be careful!

Demagnetization risk

Control the heat. Exposing the magnet to high heat will destroy its magnetic structure and pulling force.

Security! Learn more about hazards in the article: Safety of working with magnets.

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

Material specification

Environmental data

Magnet pull force

Field Strength

See also offers

MW 2x4 / N38 - cylindrical magnet

MW 3x2 / N38 - cylindrical magnet

MPL 7x7x3 / N38 - lamellar magnet

SMZR 25x250 / N52 - magnetic separator with handle

Strengths and weaknesses of neodymium magnets.

Advantages

Cons

Holding force characteristics

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

Determinants of practical lifting force of a magnet

Warnings

Metal Allergy

Impact on smartphones

Respect the power

Keep away from children

Danger to pacemakers

Shattering risk

Keep away from computers

Dust explosion hazard

Bone fractures

Demagnetization risk

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C