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

Product available Ships tomorrow

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

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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

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Parameters and shape of a magnet can be verified with our modular 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

Technical specification and ecology

Elemental analysis

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%

Ecology and recycling (GPSR)

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

Measurement Calculator

Pulling force

Force in kg

Force (N)

Force in lbs

Field Strength

Induction (Gs)

Induction (T)

Simply populate a single box, to let the converter calculate the rest instantly.

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Holders with a hook are indispensable in large-format stores and warehouses for suspending advertisements (POS systems). In workshops and garages, they work perfectly for guiding cables or hanging work lighting.

The tip is fully demountable - you can unscrew the hook and screw in a bolt, eyelet, or other element in its place. Check the thread size in the product specification to select matching replacements.

The nominal capacity (e.g., 14.50 kg) refers to perpendicular (vertical) force when mounted on the ceiling. If you hang the magnet on a wall, the real capacity is approx. 20-30% of the nominal value.

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.

Standard holders are coated with a layer of nickel or zinc, which protects them from corrosion indoors. Metal elements can rust with constant contact with atmospheric moisture.

Strengths as well as weaknesses of Nd₂Fe₁₄B magnets.

Pros

Besides their tremendous magnetic power, neodymium magnets offer the following advantages:

They have constant strength, and over around 10 years their performance decreases symbolically – ~1% (in testing),
Neodymium magnets remain exceptionally resistant to demagnetization caused by external interference,
The use of an elegant finish of noble metals (nickel, gold, silver) causes the element to have aesthetics,
The surface of neodymium magnets generates a concentrated magnetic field – this is a key feature,
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...
In view of the option of precise molding and customization to specialized requirements, NdFeB magnets can be produced in a broad palette of forms and dimensions, which amplifies use scope,
Key role in modern technologies – they find application in computer drives, motor assemblies, diagnostic systems, also complex engineering applications.
Relatively small size with high pulling force – neodymium magnets offer high power in compact dimensions, which allows their use in small systems

Limitations

Disadvantages of NdFeB magnets:

They are prone to damage upon heavy impacts. To avoid cracks, it is worth securing magnets in special housings. Such protection not only protects the magnet but also improves its resistance to damage
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
When exposed to humidity, magnets start to rust. For applications outside, it is recommended to use protective magnets, such as those in rubber or plastics, which secure oxidation as well as corrosion.
Limited ability of making threads in the magnet and complicated shapes - recommended is cover - mounting mechanism.
Health risk related to microscopic parts of magnets pose a threat, if swallowed, which is particularly important in the context of child health protection. Additionally, small components of these products can disrupt the diagnostic process medical after entering the body.
Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Lifting parameters

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

The specified lifting capacity concerns the maximum value, measured under laboratory conditions, meaning:

with the use of a yoke made of low-carbon steel, guaranteeing full magnetic saturation
whose thickness is min. 10 mm
with a plane free of scratches
under conditions of ideal adhesion (surface-to-surface)
for force applied at a right angle (pull-off, not shear)
at room temperature

Practical lifting capacity: influencing factors

In real-world applications, the real power results from a number of factors, ranked from the most important:

Gap between magnet and steel – every millimeter of separation (caused e.g. by veneer or unevenness) drastically reduces the magnet efficiency, often by half at just 0.5 mm.
Force direction – catalog parameter refers to pulling vertically. When applying parallel force, the magnet exhibits significantly lower power (often approx. 20-30% of nominal force).
Wall thickness – thin material does not allow full use of the magnet. Part of the magnetic field penetrates through instead of converting into lifting capacity.
Material type – ideal substrate is pure iron steel. Hardened steels may generate lower lifting capacity.
Plate texture – smooth surfaces guarantee perfect abutment, which increases field saturation. Uneven metal reduce efficiency.
Thermal conditions – neodymium magnets have a sensitivity to temperature. When it is hot they are weaker, and in frost gain strength (up to a certain limit).

Holding force was checked on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, however under parallel forces the load capacity is reduced by as much as 75%. Additionally, even a slight gap between the magnet’s surface and the plate decreases the load capacity.

Warnings

Crushing force

Big blocks can break fingers in a fraction of a second. Never put your hand betwixt two strong magnets.

Dust explosion hazard

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

Phone sensors

Navigation devices and mobile phones are extremely susceptible to magnetism. Direct contact with a powerful NdFeB magnet can decalibrate the sensors in your phone.

Avoid contact if allergic

Medical facts indicate that the nickel plating (standard magnet coating) is a common allergen. For allergy sufferers, avoid direct skin contact or choose coated magnets.

Medical implants

Health Alert: Strong magnets can deactivate heart devices and defibrillators. Do not approach if you have electronic implants.

Choking Hazard

Product intended for adults. Tiny parts can be swallowed, leading to serious injuries. Keep out of reach of kids and pets.

Electronic hazard

Avoid bringing magnets near a wallet, computer, or TV. The magnetism can irreversibly ruin these devices and wipe information from cards.

Thermal limits

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

Fragile material

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

Handling rules

Before starting, check safety instructions. Uncontrolled attraction can break the magnet or injure your hand. Think ahead.

Danger! Want to know more? 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

Elemental analysis

Ecology and recycling (GPSR)

Pulling force

Field Strength

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Strengths as well as weaknesses of Nd2Fe14B magnets.

Pros

Limitations

Lifting parameters

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

Practical lifting capacity: influencing factors

Warnings

Crushing force

Dust explosion hazard

Phone sensors

Avoid contact if allergic

Medical implants

Choking Hazard

Electronic hazard

Thermal limits

Fragile material

Handling rules

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

Strengths as well as weaknesses of Nd₂Fe₁₄B magnets.