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: 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

see specifications »

14.49 ZŁ with VAT / pcs + price for transport

11.78 ZŁ net + 23% VAT / pcs

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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%

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: 310426-2025

Measurement Calculator

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They serve to create mobile suspension points without the need to drill holes in beams. It is a universal hanger that you can move to another place at any time without a trace.

The magnet has a standard threaded socket, which allows replacing the hook with any other accessory with a thread. Check the thread size in the product specification to select matching replacements.

You will get the greatest force by mounting the magnet on a thick, smooth steel surface vertically. For heavy ceiling ads or tools, we recommend choosing a magnet with a considerable power reserve.

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.

Standard holders are coated with a layer of nickel or zinc, which protects them from corrosion indoors. In home and office conditions, they will serve for many years without signs of wear.

Advantages and disadvantages of Nd₂Fe₁₄B magnets.

Advantages

Besides their magnetic performance, neodymium magnets are valued for these benefits:

They do not lose power, even after approximately 10 years – the decrease in lifting capacity is only ~1% (theoretically),
They are noted for resistance to demagnetization induced by external magnetic fields,
The use of an aesthetic coating of noble metals (nickel, gold, silver) causes the element to be more visually attractive,
Magnets exhibit very high magnetic induction on the outer side,
Due to their durability and thermal resistance, neodymium magnets can operate (depending on the form) even at high temperatures reaching 230°C or more...
Possibility of detailed modeling as well as modifying to complex applications,
Wide application in high-tech industry – they are commonly used in HDD drives, drive modules, medical equipment, also multitasking production systems.
Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Limitations

Disadvantages of NdFeB magnets:

To avoid cracks under impact, we suggest using special steel housings. Such a solution protects the magnet and simultaneously increases its durability.
Neodymium magnets decrease 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 recommend using waterproof magnets made of rubber, plastic or other material stable to moisture, in case of application outdoors
Limited ability of creating nuts in the magnet and complex shapes - recommended is cover - mounting mechanism.
Health risk to health – tiny shards of magnets are risky, if swallowed, which becomes key in the context of child health protection. Furthermore, tiny parts of these devices are able to disrupt the diagnostic process medical when they are in the body.
Due to expensive raw materials, their price exceeds standard values,

Lifting parameters

Maximum lifting capacity of the magnet – what contributes to it?

The load parameter shown concerns the peak performance, recorded under optimal environment, meaning:

with the use of a sheet made of special test steel, guaranteeing maximum field concentration
whose thickness equals approx. 10 mm
characterized by smoothness
without the slightest clearance between the magnet and steel
for force applied at a right angle (in the magnet axis)
at ambient temperature approx. 20 degrees Celsius

Lifting capacity in real conditions – factors

Holding efficiency is affected by specific conditions, such as (from most important):

Clearance – the presence of foreign body (rust, tape, gap) acts as an insulator, which reduces capacity steeply (even by 50% at 0.5 mm).
Loading method – catalog parameter refers to detachment vertically. When slipping, the magnet exhibits much less (typically approx. 20-30% of nominal force).
Element thickness – for full efficiency, the steel must be sufficiently thick. Paper-thin metal limits the attraction force (the magnet "punches through" it).
Steel grade – ideal substrate is high-permeability steel. Hardened steels may have worse magnetic properties.
Plate texture – smooth surfaces guarantee perfect abutment, which improves field saturation. Rough surfaces weaken the grip.
Temperature – temperature increase results in weakening of force. It is worth remembering the thermal limit for a given model.

Lifting capacity testing was conducted on plates with a smooth surface of optimal thickness, under perpendicular forces, whereas under parallel forces the holding force is lower. In addition, even a minimal clearance between the magnet’s surface and the plate decreases the holding force.

Warnings

This is not a toy

Strictly store magnets out of reach of children. Risk of swallowing is significant, and the effects of magnets clamping inside the body are tragic.

Demagnetization risk

Avoid heat. NdFeB magnets are susceptible to heat. If you require resistance above 80°C, look for HT versions (H, SH, UH).

Powerful field

Be careful. Neodymium magnets act from a distance and snap with massive power, often quicker than you can react.

Nickel allergy

Medical facts indicate that the nickel plating (the usual finish) is a common allergen. For allergy sufferers, prevent direct skin contact and opt for encased magnets.

Shattering risk

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

Pacemakers

Health Alert: Strong magnets can turn off pacemakers and defibrillators. Do not approach if you have electronic implants.

Crushing risk

Risk of injury: The pulling power is so immense that it can cause blood blisters, crushing, and broken bones. Use thick gloves.

Combustion hazard

Powder generated during machining of magnets is combustible. Do not drill into magnets unless you are an expert.

GPS and phone interference

An intense magnetic field negatively affects the functioning of compasses in phones and GPS navigation. Keep magnets close to a device to prevent breaking the sensors.

Safe distance

Very strong magnetic fields can destroy records on credit cards, hard drives, and other magnetic media. Stay away of min. 10 cm.

Security! Looking for details? Read our article: Are neodymium magnets dangerous?

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

Environmental data

Pulling force

Magnetic Induction

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UMGGZ 88x8.5 [M8] GZ / N38 - rubber magnetic holder external thread

MPL 20x5x5 / N38 - lamellar magnet

BM 380x180x70 [4x M8] - magnetic beam

MPL 40x7x3 / N38 - lamellar magnet

Advantages and disadvantages of Nd2Fe14B magnets.

Advantages

Limitations

Lifting parameters

Maximum lifting capacity of the magnet – what contributes to it?

Lifting capacity in real conditions – factors

Warnings

This is not a toy

Demagnetization risk

Powerful field

Nickel allergy

Shattering risk

Pacemakers

Crushing risk

Combustion hazard

GPS and phone interference

Safe distance

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

Advantages and disadvantages of Nd₂Fe₁₄B magnets.