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 details »

14.49 ZŁ with VAT / pcs + price for transport

11.78 ZŁ net + 23% VAT / pcs

bulk discounts:

Need more?

price from 1 pcs

11.78 ZŁ

14.49 ZŁ

price from 30 pcs

11.07 ZŁ

13.62 ZŁ

price from 70 pcs

10.37 ZŁ

12.75 ZŁ

Carbon Footprint – environmental impact GPSR Regulation – product safety

Want to negotiate?

Call us now +48 888 99 98 98 if you prefer contact us via our online form our website.
Parameters along with form of neodymium magnets can be reviewed with our power calculator.

Same-day processing for orders placed before 14:00.

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%

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

Measurement Calculator

Pulling force

Force in kg

Force (N)

Force in lbs

Magnetic Field

Induction (Gs)

Induction (T)

Put your value in a single slot to get results for the other fields at once.

Other deals

Product available Ships tomorrow

UMH 36x8x46 [M6] / N38 - magnetic holder with hook

26.64 ZŁ brutto / pcs

Product available Ships tomorrow

FM Ruszt magnetyczny do leja fi 200 dwupoziomowy / N52 - magnetic filter

4458.75 ZŁ brutto / pcs

Product available Ships tomorrow

SMZR 25x225 / N52 - magnetic separator with handle

615.00 ZŁ brutto / pcs

Product available Ships tomorrow

MPL 30x20x4 / N38 - lamellar magnet

10.23 ZŁ brutto / pcs

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). Thanks to this, one magnet can perform many functions - sometimes be a hook, and sometimes a holder for a bolt.

The nominal capacity (e.g., 25.00 kg) refers to perpendicular (vertical) force when mounted on the ceiling. When mounting on a wall (vertically), the holding force is much lower due to shear force (the magnet may slide).

The steel housing (cup) shields the magnetic field, directing all its power downwards, onto the contact surface. 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 rare earth magnets.

Pros

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

Their magnetic field is durable, and after approximately 10 years it drops only by ~1% (according to research),
They do not lose their magnetic properties even under strong external field,
Thanks to the reflective finish, the plating of nickel, gold, or silver gives an clean appearance,
Magnets possess maximum magnetic induction on the outer side,
Through (appropriate) combination of ingredients, they can achieve high thermal resistance, allowing for action at temperatures reaching 230°C and above...
Considering the possibility of accurate molding and adaptation to individualized needs, neodymium magnets can be created in a wide range of geometric configurations, which expands the range of possible applications,
Wide application in innovative solutions – they are utilized in magnetic memories, electric motors, advanced medical instruments, and complex engineering applications.
Compactness – despite small sizes they generate large force, making them ideal for precision applications

Limitations

Disadvantages of NdFeB magnets:

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 secures them against impacts but also raises 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 force. Therefore, we recommend our special magnets marked [AH], which maintain stability 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 stable to moisture, in case of application outdoors
Due to limitations in creating threads and complex shapes in magnets, we propose using a housing - magnetic mount.
Health risk resulting from small fragments of magnets are risky, if swallowed, which gains importance in the context of child safety. Additionally, tiny parts of these devices are able to be problematic in diagnostics medical after entering the body.
Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Pull force analysis

Maximum magnetic pulling force – what it depends on?

Breakaway force was defined for the most favorable conditions, taking into account:

using a base made of high-permeability steel, functioning as a circuit closing element
with a cross-section minimum 10 mm
characterized by lack of roughness
with zero gap (no paint)
during detachment in a direction perpendicular to the plane
at conditions approx. 20°C

Lifting capacity in practice – influencing factors

Please note that the magnet holding may be lower depending on the following factors, starting with the most relevant:

Space between surfaces – even a fraction of a millimeter of separation (caused e.g. by veneer or dirt) drastically reduces the pulling force, often by half at just 0.5 mm.
Loading method – declared lifting capacity refers to detachment vertically. When applying parallel force, the magnet holds significantly lower power (typically approx. 20-30% of nominal force).
Wall thickness – thin material does not allow full use of the magnet. Magnetic flux passes through the material instead of generating force.
Steel grade – ideal substrate is high-permeability steel. Stainless steels may generate lower lifting capacity.
Plate texture – ground elements guarantee perfect abutment, which improves field saturation. Uneven metal reduce efficiency.
Temperature – temperature increase results in weakening of induction. Check the thermal limit for a given model.

Lifting capacity was assessed with the use of a polished steel plate of suitable thickness (min. 20 mm), under perpendicular detachment force, whereas under shearing force the load capacity is reduced by as much as 75%. Additionally, even a minimal clearance between the magnet and the plate decreases the lifting capacity.

Precautions when working with NdFeB magnets

Threat to electronics

Do not bring magnets near a wallet, computer, or screen. The magnetic field can destroy these devices and wipe information from cards.

Heat warning

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

Do not give to children

Only for adults. Tiny parts pose a choking risk, leading to intestinal necrosis. Keep away from kids and pets.

Sensitization to coating

Warning for allergy sufferers: The nickel-copper-nickel coating consists of nickel. If redness happens, immediately stop handling magnets and use protective gear.

Keep away from electronics

An intense magnetic field negatively affects the functioning of magnetometers in phones and navigation systems. Keep magnets close to a device to avoid damaging the sensors.

Life threat

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

Dust explosion hazard

Fire warning: Neodymium dust is highly flammable. Avoid machining magnets without safety gear as this risks ignition.

Magnet fragility

Beware of splinters. Magnets can explode upon uncontrolled impact, ejecting shards into the air. Wear goggles.

Caution required

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

Crushing risk

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

Important! Details about hazards 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

Sustainability

Pulling force

Magnetic Field

Other deals

UMH 36x8x46 [M6] / N38 - magnetic holder with hook

FM Ruszt magnetyczny do leja fi 200 dwupoziomowy / N52 - magnetic filter

SMZR 25x225 / N52 - magnetic separator with handle

MPL 30x20x4 / N38 - lamellar magnet

Advantages and disadvantages of rare earth magnets.

Pros

Limitations

Pull force analysis

Maximum magnetic pulling force – what it depends on?

Lifting capacity in practice – influencing factors

Precautions when working with NdFeB magnets

Threat to electronics

Heat warning

Do not give to children

Sensitization to coating

Keep away from electronics

Life threat

Dust explosion hazard

Magnet fragility

Caution required

Crushing risk

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C