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

view technical data »

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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Parameters and form of neodymium magnets can be tested using our magnetic 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

Engineering data and GPSR

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

Measurement Calculator

Magnet pull force

Force in lbs

Magnetic Field

Gauss (Gs)

Put your value in a single field to get results in the other units immediately.

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A hook magnet is an ideal solution for quick mounting of banners, signs, and markings on steel ceiling structures. 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). This gives huge application flexibility and allows adapting the holder to current needs.

You will get the greatest force by mounting the magnet on a thick, smooth steel surface vertically. If you hang the magnet on a wall, the real capacity is approx. 20-30% of the nominal value.

The steel housing (cup) shields the magnetic field, directing all its power downwards, onto the contact surface. The housing ensures mechanical durability, which is important in industrial and assembly conditions.

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.

Pros and cons of Nd₂Fe₁₄B magnets.

Benefits

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

They virtually do not lose strength, because even after 10 years the decline in efficiency is only ~1% (in laboratory conditions),
They are noted for resistance to demagnetization induced by presence of other magnetic fields,
Thanks to the reflective finish, the coating of Ni-Cu-Ni, gold, or silver-plated gives an clean appearance,
Magnets possess extremely high magnetic induction on the active area,
Through (adequate) combination of ingredients, they can achieve high thermal strength, allowing for functioning at temperatures reaching 230°C and above...
Considering the possibility of accurate molding and customization to specialized solutions, NdFeB magnets can be created in a wide range of geometric configurations, which increases their versatility,
Significant place in advanced technology sectors – they are used in data components, motor assemblies, precision medical tools, also industrial machines.
Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Weaknesses

Problematic aspects of neodymium magnets and ways of using them

Brittleness is one of their disadvantages. Upon strong impact they can fracture. We advise keeping them in a special holder, which not only protects them against impacts but also increases their durability
We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
They rust in a humid environment. For use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
We recommend casing - magnetic mount, due to difficulties in realizing nuts inside the magnet and complicated forms.
Possible danger resulting from small fragments of magnets pose a threat, in case of ingestion, which is particularly important in the aspect of protecting the youngest. It is also worth noting that small components of these products can be problematic in diagnostics medical in case of swallowing.
With budget limitations the cost of neodymium magnets can be a barrier,

Holding force characteristics

Maximum lifting force for a neodymium magnet – what it depends on?

The force parameter is a result of laboratory testing performed under the following configuration:

using a plate made of high-permeability steel, acting as a magnetic yoke
whose transverse dimension equals approx. 10 mm
with an ground contact surface
without any air gap between the magnet and steel
under perpendicular application of breakaway force (90-degree angle)
in stable room temperature

Practical aspects of lifting capacity – factors

Real force impacted by specific conditions, such as (from most important):

Gap between magnet and steel – every millimeter of separation (caused e.g. by veneer or dirt) significantly weakens the pulling force, often by half at just 0.5 mm.
Loading method – declared lifting capacity refers to detachment vertically. When attempting to slide, the magnet exhibits much less (typically approx. 20-30% of nominal force).
Wall thickness – the thinner the sheet, the weaker the hold. Magnetic flux penetrates through instead of converting into lifting capacity.
Metal type – not every steel reacts the same. High carbon content weaken the interaction with the magnet.
Surface condition – smooth surfaces ensure maximum contact, which improves force. Rough surfaces weaken the grip.
Thermal environment – temperature increase causes a temporary drop of force. Check the thermal limit for a given model.

Lifting capacity testing was conducted on plates with a smooth surface of suitable thickness, under perpendicular forces, however under attempts to slide the magnet the holding force is lower. Additionally, even a slight gap between the magnet and the plate reduces the holding force.

Safety rules for work with NdFeB magnets

Precision electronics

A powerful magnetic field negatively affects the functioning of magnetometers in smartphones and navigation systems. Maintain magnets close to a smartphone to prevent damaging the sensors.

Sensitization to coating

It is widely known that nickel (standard magnet coating) is a common allergen. If your skin reacts to metals, avoid direct skin contact or opt for coated magnets.

Physical harm

Danger of trauma: The pulling power is so great that it can result in blood blisters, pinching, and even bone fractures. Protective gloves are recommended.

Medical implants

Patients with a pacemaker should keep an absolute distance from magnets. The magnetic field can disrupt the operation of the implant.

Dust explosion hazard

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

No play value

Strictly keep magnets away from children. Ingestion danger is significant, and the effects of magnets clamping inside the body are very dangerous.

Maximum temperature

Standard neodymium magnets (grade N) lose power when the temperature goes above 80°C. This process is irreversible.

Data carriers

Very strong magnetic fields can destroy records on credit cards, HDDs, and storage devices. Stay away of at least 10 cm.

Caution required

Handle with care. Rare earth magnets attract from a distance and connect with massive power, often quicker than you can move away.

Magnet fragility

Beware of splinters. Magnets can fracture upon violent connection, ejecting sharp fragments into the air. We recommend safety glasses.

Attention! 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

Material specification

Environmental data

Magnet pull force

Magnetic Field

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UMC 16x5/2x5 / N38 - cylindrical magnetic holder

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MW 10x30 / N38 - cylindrical magnet

Pros and cons of Nd2Fe14B magnets.

Benefits

Weaknesses

Holding force characteristics

Maximum lifting force for a neodymium magnet – what it depends on?

Practical aspects of lifting capacity – factors

Safety rules for work with NdFeB magnets

Precision electronics

Sensitization to coating

Physical harm

Medical implants

Dust explosion hazard

No play value

Maximum temperature

Data carriers

Caution required

Magnet fragility

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

Pros and cons of Nd₂Fe₁₄B magnets.