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

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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: PLN 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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Technical specification - 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

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: 310425-2026

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Holders with a hook are indispensable in large-format stores and warehouses for suspending advertisements (POS systems). It is a universal hanger that you can move to another place at any time without a trace.

The tip is fully demountable - you can unscrew the hook and screw in a bolt, eyelet, or other element in its place. This gives huge application flexibility and allows adapting the holder to current needs.

The nominal capacity (e.g., 14.50 kg) refers to perpendicular (vertical) force when mounted on the ceiling. For heavy ceiling ads or tools, we recommend choosing a magnet with a considerable power reserve.

The cup acts as a magnetic armature, intensifying the neodymium action and increasing efficiency. The housing ensures mechanical durability, which is important in industrial and assembly conditions.

For outdoor use (in rain), metal hangers may eventually develop a rusty coating over time. In home and office conditions, they will serve for many years without signs of wear.

Strengths and weaknesses of Nd₂Fe₁₄B magnets.

Benefits

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

They have constant strength, and over more than 10 years their attraction force decreases symbolically – ~1% (according to theory),
They show high resistance to demagnetization induced by external disturbances,
Thanks to the metallic finish, the surface of Ni-Cu-Ni, gold, or silver gives an professional appearance,
They feature high magnetic induction at the operating surface, which increases their power,
Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
Thanks to versatility in forming and the capacity to modify to complex applications,
Wide application in modern industrial fields – they find application in data components, brushless drives, diagnostic systems, also multitasking production systems.
Relatively small size with high pulling force – neodymium magnets offer high power in tiny dimensions, which makes them useful in miniature devices

Weaknesses

Characteristics of disadvantages of neodymium magnets: weaknesses and usage proposals

At strong impacts they can crack, therefore we recommend placing them in special holders. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
We warn that neodymium magnets can lose their strength at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 230°C.
They oxidize in a humid environment - during use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
We recommend a housing - magnetic mount, due to difficulties in realizing nuts inside the magnet and complicated shapes.
Potential hazard related to microscopic parts of magnets are risky, if swallowed, which is particularly important in the aspect of protecting the youngest. Furthermore, tiny parts of these magnets are able to be problematic in diagnostics medical when they are in the body.
High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which increases costs of application in large quantities

Lifting parameters

Maximum holding power of the magnet – what contributes to it?

The specified lifting capacity refers to the limit force, recorded under optimal environment, specifically:

using a plate made of mild steel, serving as a ideal flux conductor
possessing a thickness of at least 10 mm to avoid saturation
with an polished touching surface
without any air gap between the magnet and steel
for force applied at a right angle (in the magnet axis)
in neutral thermal conditions

Practical lifting capacity: influencing factors

During everyday use, the actual lifting capacity is determined by a number of factors, listed from crucial:

Space between surfaces – even a fraction of a millimeter of distance (caused e.g. by veneer or dirt) significantly weakens the pulling force, often by half at just 0.5 mm.
Force direction – catalog parameter refers to detachment vertically. When attempting to slide, the magnet exhibits much less (typically approx. 20-30% of nominal force).
Base massiveness – insufficiently thick sheet does not accept the full field, causing part of the flux to be lost to the other side.
Material type – the best choice is high-permeability steel. Hardened steels may have worse magnetic properties.
Smoothness – full contact is obtained only on smooth steel. Any scratches and bumps reduce the real contact area, reducing force.
Temperature – temperature increase causes a temporary drop of force. It is worth remembering the maximum operating temperature for a given model.

Holding force was measured on the plate surface of 20 mm thickness, when a perpendicular force was applied, whereas under attempts to slide the magnet the lifting capacity is smaller. In addition, even a slight gap between the magnet and the plate decreases the load capacity.

Precautions when working with neodymium magnets

Power loss in heat

Monitor thermal conditions. Heating the magnet above 80 degrees Celsius will destroy its magnetic structure and strength.

Threat to electronics

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

Immense force

Before use, read the rules. Uncontrolled attraction can break the magnet or injure your hand. Think ahead.

Swallowing risk

Only for adults. Small elements can be swallowed, leading to severe trauma. Keep away from children and animals.

Combustion hazard

Combustion risk: Rare earth powder is explosive. Do not process magnets in home conditions as this may cause fire.

Material brittleness

NdFeB magnets are ceramic materials, which means they are very brittle. Collision of two magnets leads to them breaking into small pieces.

Pacemakers

Warning for patients: Strong magnetic fields affect medical devices. Keep at least 30 cm distance or ask another person to work with the magnets.

Avoid contact if allergic

It is widely known that nickel (the usual finish) is a potent allergen. If you have an allergy, prevent touching magnets with bare hands and select encased magnets.

Keep away from electronics

Be aware: rare earth magnets generate a field that disrupts precision electronics. Keep a separation from your phone, device, and navigation systems.

Serious injuries

Large magnets can smash fingers in a fraction of a second. Under no circumstances place your hand between two attracting surfaces.

Security! More info about risks in the article: Magnet Safety Guide.

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

Technical specification - 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

Pulling force

Field Strength

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Strengths and weaknesses of Nd2Fe14B magnets.

Benefits

Weaknesses

Lifting parameters

Maximum holding power of the magnet – what contributes to it?

Practical lifting capacity: influencing factors

Precautions when working with neodymium magnets

Power loss in heat

Threat to electronics

Immense force

Swallowing risk

Combustion hazard

Material brittleness

Pacemakers

Avoid contact if allergic

Keep away from electronics

Serious injuries

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

Strengths and weaknesses of Nd₂Fe₁₄B magnets.