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

Product available Ships today (order by 14:00)

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

view parameters »

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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Contact us by phone +48 22 499 98 98 or contact us through contact form the contact form page.
Lifting power as well as structure of a neodymium magnet can be verified using our modular calculator.

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Detailed 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

Engineering data and GPSR

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%

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

Pulling force

Force in lbs

Magnetic Induction

Tesla (T)

Input a number into any field, to see the remaining units convert on the fly.

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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.

The tip is fully demountable - you can unscrew the hook and screw in a bolt, eyelet, or other element in its place. 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., 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.

Thanks to the metal cover, attraction force is concentrated, which significantly increases capacity compared to a bare magnet. 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. In home and office conditions, they will serve for many years without signs of wear.

Pros and cons of Nd₂Fe₁₄B magnets.

Strengths

Apart from their strong power, neodymium magnets have these key benefits:

They have constant strength, and over nearly ten years their performance decreases symbolically – ~1% (in testing),
Neodymium magnets are distinguished by highly resistant to magnetic field loss caused by external interference,
A magnet with a smooth gold surface looks better,
The surface of neodymium magnets generates a maximum magnetic field – this is one of their assets,
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 modularity in shaping and the ability to modify to complex applications,
Wide application in high-tech industry – they find application in mass storage devices, drive modules, medical equipment, and multitasking production systems.
Compactness – despite small sizes they generate large force, making them ideal for precision applications

Disadvantages

Disadvantages of NdFeB magnets:

At very strong impacts they can break, therefore we recommend placing them in special holders. A metal housing provides additional protection against damage and increases the magnet's durability.
Neodymium magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of strength (a factor is the shape and dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are extremely resistant to heat
They oxidize in a humid environment. For use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
Limited possibility of producing nuts in the magnet and complex forms - recommended is a housing - magnetic holder.
Potential hazard related to microscopic parts of magnets pose a threat, if swallowed, which gains importance in the context of child safety. Furthermore, small components of these products can disrupt the diagnostic process medical after entering the body.
Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Lifting parameters

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

The specified lifting capacity represents the maximum value, obtained under optimal environment, namely:

with the contact of a sheet made of low-carbon steel, ensuring full magnetic saturation
whose thickness equals approx. 10 mm
with an polished touching surface
with zero gap (without paint)
during detachment in a direction perpendicular to the mounting surface
in stable room temperature

Key elements affecting lifting force

Holding efficiency is affected by specific conditions, including (from priority):

Distance – existence of any layer (rust, tape, gap) acts as an insulator, which reduces power rapidly (even by 50% at 0.5 mm).
Angle of force application – maximum parameter is reached only during perpendicular pulling. The force required to slide of the magnet along the surface is typically many times lower (approx. 1/5 of the lifting capacity).
Steel thickness – too thin plate does not accept the full field, causing part of the power to be lost into the air.
Chemical composition of the base – mild steel attracts best. Higher carbon content decrease magnetic properties and holding force.
Surface quality – the more even the plate, the larger the contact zone and higher the lifting capacity. Unevenness creates an air distance.
Temperature – heating the magnet causes a temporary drop of force. It is worth remembering the thermal limit for a given model.

Lifting capacity testing was conducted on plates with a smooth surface of suitable thickness, under a perpendicular pulling force, however under shearing force the lifting capacity is smaller. Moreover, even a small distance between the magnet’s surface and the plate lowers the holding force.

H&S for magnets

Powerful field

Be careful. Rare earth magnets act from a distance and snap with huge force, often quicker than you can move away.

Phone sensors

Be aware: rare earth magnets produce a field that interferes with sensitive sensors. Keep a separation from your mobile, device, and GPS.

Operating temperature

Standard neodymium magnets (grade N) lose magnetization when the temperature exceeds 80°C. This process is irreversible.

Implant safety

Patients with a pacemaker should maintain an safe separation from magnets. The magnetic field can disrupt the functioning of the implant.

Combustion hazard

Powder produced during machining of magnets is combustible. Avoid drilling into magnets without proper cooling and knowledge.

Material brittleness

NdFeB magnets are ceramic materials, which means they are fragile like glass. Collision of two magnets will cause them shattering into shards.

Keep away from children

Absolutely store magnets away from children. Ingestion danger is high, and the consequences of magnets connecting inside the body are life-threatening.

Crushing risk

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

Keep away from computers

Intense magnetic fields can destroy records on credit cards, HDDs, and storage devices. Keep a distance of at least 10 cm.

Nickel allergy

Studies show that the nickel plating (standard magnet coating) is a potent allergen. If your skin reacts to metals, refrain from direct skin contact or select coated magnets.

Important! Want to know more? Check our post: Why are neodymium magnets dangerous?

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

Detailed specification - 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

Environmental data

Pulling force

Magnetic Induction

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MPL 25x15x2 / N38 - lamellar magnet

MW 5x25 / N38 - cylindrical magnet

SM 25x350 [2xM8] / N42 - magnetic separator

Pros and cons of Nd2Fe14B magnets.

Strengths

Disadvantages

Lifting parameters

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

Key elements affecting lifting force

H&S for magnets

Powerful field

Phone sensors

Operating temperature

Implant safety

Combustion hazard

Material brittleness

Keep away from children

Crushing risk

Keep away from computers

Nickel allergy

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

Pros and cons of Nd₂Fe₁₄B magnets.