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

see technical specifications »

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

Not sure about your choice?

Pick up the phone and ask +48 888 99 98 98 or let us know by means of our online form through our site.
Parameters along with shape of a magnet can be reviewed with our power calculator.

Orders placed before 14:00 will be shipped the same business day.

Technical of the product - 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

Measurement Calculator

Pulling force

Force (N)

lbs

Field Strength

Type a value into a field, to see all other values change in real-time.

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They serve to create mobile suspension points without the need to drill holes in beams. 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. 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.

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.

Strengths and weaknesses of neodymium magnets.

Pros

Besides their stability, neodymium magnets are valued for these benefits:

Their strength is maintained, and after around 10 years it drops only by ~1% (theoretically),
They show high resistance to demagnetization induced by external disturbances,
Thanks to the shiny finish, the surface of Ni-Cu-Ni, gold, or silver-plated gives an visually attractive appearance,
Neodymium magnets generate maximum magnetic induction on a their surface, which allows for strong attraction,
Due to their durability and thermal resistance, neodymium magnets can operate (depending on the shape) even at high temperatures reaching 230°C or more...
In view of the potential of precise shaping and adaptation to unique requirements, magnetic components can be created in a variety of shapes and sizes, which makes them more universal,
Wide application in innovative solutions – they are used in hard drives, electric drive systems, medical devices, and other advanced devices.
Relatively small size with high pulling force – neodymium magnets offer high power in small dimensions, which allows their use in compact constructions

Disadvantages

Disadvantages of NdFeB magnets:

To avoid cracks upon strong impacts, we recommend using special steel holders. Such a solution secures the magnet and simultaneously improves its durability.
When exposed to high temperature, neodymium magnets suffer a drop in force. Often, when the temperature exceeds 80°C, their power decreases (depending on the size, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
They oxidize in a humid environment - during use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
We suggest a housing - magnetic holder, due to difficulties in creating nuts inside the magnet and complex shapes.
Potential hazard related to microscopic parts of magnets pose a threat, when accidentally swallowed, which becomes key in the context of child health protection. It is also worth noting that small elements of these products are able to complicate diagnosis medical in case of swallowing.
With large orders the cost of neodymium magnets can be a barrier,

Lifting parameters

Detachment force of the magnet in optimal conditions – what contributes to it?

Holding force of 25.00 kg is a measurement result conducted under the following configuration:

using a plate made of high-permeability steel, functioning as a ideal flux conductor
whose thickness is min. 10 mm
with an ground contact surface
without the slightest insulating layer between the magnet and steel
for force acting at a right angle (pull-off, not shear)
at temperature room level

Practical aspects of lifting capacity – factors

It is worth knowing that the application force may be lower subject to the following factors, in order of importance:

Gap between magnet and steel – every millimeter of separation (caused e.g. by varnish or unevenness) significantly weakens the magnet efficiency, often by half at just 0.5 mm.
Pull-off angle – remember that the magnet holds strongest perpendicularly. Under sliding down, the capacity drops significantly, often to levels of 20-30% of the nominal value.
Element thickness – for full efficiency, the steel must be sufficiently thick. Thin sheet restricts the lifting capacity (the magnet "punches through" it).
Steel grade – the best choice is pure iron steel. Hardened steels may have worse magnetic properties.
Base smoothness – the more even the plate, the better the adhesion and higher the lifting capacity. Unevenness creates an air distance.
Temperature influence – hot environment reduces magnetic field. Too high temperature can permanently demagnetize the magnet.

Lifting capacity was determined by applying a steel plate with a smooth surface of optimal thickness (min. 20 mm), under perpendicular detachment force, however under attempts to slide the magnet the lifting capacity is smaller. Additionally, even a slight gap between the magnet and the plate decreases the lifting capacity.

H&S for magnets

Risk of cracking

Watch out for shards. Magnets can fracture upon uncontrolled impact, launching sharp fragments into the air. We recommend safety glasses.

Metal Allergy

Certain individuals suffer from a hypersensitivity to nickel, which is the standard coating for NdFeB magnets. Frequent touching may cause an allergic reaction. We suggest use safety gloves.

Handling guide

Before starting, read the rules. Sudden snapping can break the magnet or hurt your hand. Think ahead.

Crushing force

Watch your fingers. Two powerful magnets will snap together immediately with a force of massive weight, crushing everything in their path. Be careful!

Do not drill into magnets

Dust generated during grinding of magnets is combustible. Avoid drilling into magnets without proper cooling and knowledge.

Warning for heart patients

For implant holders: Powerful magnets affect electronics. Keep minimum 30 cm distance or request help to handle the magnets.

Heat sensitivity

Monitor thermal conditions. Heating the magnet to high heat will ruin its magnetic structure and pulling force.

Safe distance

Data protection: Strong magnets can damage data carriers and sensitive devices (heart implants, medical aids, timepieces).

Magnetic interference

An intense magnetic field negatively affects the functioning of compasses in smartphones and navigation systems. Maintain magnets close to a device to avoid breaking the sensors.

Keep away from children

These products are not toys. Swallowing a few magnets can lead to them pinching intestinal walls, which constitutes a critical condition and necessitates urgent medical intervention.

Important! Want to know more? Read our article: Why are neodymium magnets dangerous?

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

Technical of the product - 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

Pulling force

Field Strength

Other proposals

MPL 40x5x3 / N38 - lamellar magnet

MPL 20x20x20 / N38 - lamellar magnet

MW 10x3 / N38 - cylindrical magnet

SMZR 25x200 / N52 - magnetic separator with handle

Strengths and weaknesses of neodymium magnets.

Pros

Disadvantages

Lifting parameters

Detachment force of the magnet in optimal conditions – what contributes to it?

Practical aspects of lifting capacity – factors

H&S for magnets

Risk of cracking

Metal Allergy

Handling guide

Crushing force

Do not drill into magnets

Warning for heart patients

Heat sensitivity

Safe distance

Magnetic interference

Keep away from children

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C