UMH 20x7x35 [M4] / N38 - magnetic holder with hook

Product available Ships in 2 days

UMH 20x7x35 [M4] / 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 310425

GTIN/EAN: 5906301814542

5.00

Diameter Ø

20 mm [±1 mm]

Height

35 mm [±1 mm]

Height

7 mm [±1 mm]

Weight

21 g

Magnetization Direction

↑ axial

Load capacity

14.50 kg / 142.20 N

Coating

[NiCuNi] Nickel

technical specifications »

8.59 ZŁ with VAT / pcs + price for transport

6.98 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 alternatively let us know through contact form the contact section.
Strength along with form of neodymium magnets can be estimated on our power calculator.

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Physical properties - UMH 20x7x35 [M4] / N38 - magnetic holder with hook

Specification / characteristics - UMH 20x7x35 [M4] / N38 - magnetic holder with hook

properties

properties	values
Cat. no.	310425
GTIN/EAN	5906301814542
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	20 mm [±1 mm]
Height	35 mm [±1 mm]
Height	7 mm [±1 mm]
Weight	21 g
Magnetization Direction	↑ axial
Load capacity ~ ?	14.50 kg / 142.20 N
Coating	[NiCuNi] Nickel
Manufacturing Tolerance	±1 mm

Magnetic properties of material N38

Specification / characteristics UMH 20x7x35 [M4] / 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

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: 310425-2025

Measurement Calculator

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A hook magnet is an ideal solution for quick mounting of banners, signs, and markings on steel ceiling structures. It is a universal hanger that you can move to another place at any time without a trace.

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 given value defines the maximum load when suspended under a thick, horizontal ceiling beam. 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. Additionally, steel protects the brittle magnet from cracking upon hitting the ceiling or beam.

In the bathroom or kitchen, they will work perfectly, provided they are not directly splashed with water. In home and office conditions, they will serve for many years without signs of wear.

Strengths as well as weaknesses of Nd₂Fe₁₄B magnets.

Strengths

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

They retain magnetic properties for nearly 10 years – the drop is just ~1% (according to analyses),
They show high resistance to demagnetization induced by external field influence,
A magnet with a smooth nickel surface is more attractive,
The surface of neodymium magnets generates a unique magnetic field – this is a distinguishing feature,
Due to their durability and thermal resistance, neodymium magnets can operate (depending on the form) even at high temperatures reaching 230°C or more...
Considering the option of precise shaping and adaptation to specialized solutions, neodymium magnets can be manufactured in a broad palette of shapes and sizes, which expands the range of possible applications,
Huge importance in modern technologies – they are utilized in mass storage devices, motor assemblies, medical devices, and modern systems.
Thanks to efficiency per cm³, small magnets offer high operating force, in miniature format,

Limitations

Disadvantages of NdFeB magnets:

To avoid cracks under impact, we suggest using special steel housings. Such a solution protects the magnet and simultaneously improves its durability.
Neodymium magnets decrease their power 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
When exposed to humidity, magnets usually rust. For applications outside, it is recommended to use protective magnets, such as those in rubber or plastics, which prevent oxidation as well as corrosion.
Limited possibility of producing nuts in the magnet and complex forms - recommended is cover - mounting mechanism.
Potential hazard to health – tiny shards of magnets are risky, in case of ingestion, which is particularly important in the aspect of protecting the youngest. Furthermore, tiny parts of these magnets can disrupt the diagnostic process medical when they are in the body.
Due to expensive raw materials, their price exceeds standard values,

Holding force characteristics

Optimal lifting capacity of a neodymium magnet – what it depends on?

The lifting capacity listed is a result of laboratory testing executed under specific, ideal conditions:

using a sheet made of mild steel, serving as a ideal flux conductor
possessing a massiveness of at least 10 mm to avoid saturation
with a surface cleaned and smooth
with direct contact (without coatings)
for force applied at a right angle (pull-off, not shear)
at temperature room level

Determinants of lifting force in real conditions

In real-world applications, the actual lifting capacity results from a number of factors, presented from crucial:

Clearance – the presence of foreign body (paint, tape, air) acts as an insulator, which lowers capacity rapidly (even by 50% at 0.5 mm).
Force direction – remember that the magnet has greatest strength perpendicularly. Under shear forces, the capacity drops drastically, often to levels of 20-30% of the maximum value.
Element thickness – for full efficiency, the steel must be sufficiently thick. Thin sheet limits the lifting capacity (the magnet "punches through" it).
Chemical composition of the base – mild steel attracts best. Higher carbon content reduce magnetic permeability and holding force.
Plate texture – smooth surfaces ensure maximum contact, which improves force. Rough surfaces reduce efficiency.
Operating temperature – NdFeB sinters have a negative temperature coefficient. At higher temperatures they lose power, and at low temperatures they can be stronger (up to a certain limit).

Holding force was measured on the plate surface of 20 mm thickness, when a perpendicular force was applied, in contrast under parallel forces the lifting capacity is smaller. In addition, even a minimal clearance between the magnet’s surface and the plate lowers the holding force.

Safety rules for work with neodymium magnets

Handling rules

Before use, read the rules. Sudden snapping can destroy the magnet or injure your hand. Think ahead.

Choking Hazard

NdFeB magnets are not suitable for play. Eating several magnets can lead to them attracting across intestines, which poses a critical condition and requires immediate surgery.

Precision electronics

Remember: neodymium magnets produce a field that confuses sensitive sensors. Keep a safe distance from your phone, tablet, and navigation systems.

Crushing risk

Pinching hazard: The pulling power is so immense that it can cause hematomas, crushing, and broken bones. Protective gloves are recommended.

Mechanical processing

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

Electronic hazard

Do not bring magnets near a purse, computer, or screen. The magnetism can destroy these devices and erase data from cards.

Medical implants

Health Alert: Strong magnets can deactivate heart devices and defibrillators. Stay away if you have medical devices.

Power loss in heat

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

Warning for allergy sufferers

Warning for allergy sufferers: The Ni-Cu-Ni coating contains nickel. If redness happens, immediately stop working with magnets and wear gloves.

Protective goggles

Beware of splinters. Magnets can fracture upon violent connection, launching shards into the air. We recommend safety glasses.

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

UMH 20x7x35 [M4] / N38 - magnetic holder with hook

Physical properties - UMH 20x7x35 [M4] / N38 - magnetic holder with hook

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Chemical composition

Environmental data

Magnet pull force

Magnetic Field

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Strengths as well as weaknesses of Nd2Fe14B magnets.

Strengths

Limitations

Holding force characteristics

Optimal lifting capacity of a neodymium magnet – what it depends on?

Determinants of lifting force in real conditions

Safety rules for work with neodymium magnets

Handling rules

Choking Hazard

Precision electronics

Crushing risk

Mechanical processing

Electronic hazard

Medical implants

Power loss in heat

Warning for allergy sufferers

Protective goggles

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

Strengths as well as weaknesses of Nd₂Fe₁₄B magnets.