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: 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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Call us now +48 888 99 98 98 alternatively contact us using our online form through our site.
Weight as well as shape of neodymium magnets can be reviewed using our force calculator.

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Product card - 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 and environmental data

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

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A hook magnet is an ideal solution for quick mounting of banners, signs, and markings on steel ceiling structures. You can use them to organize wires, hang tools, or clothes on metal racks.

The magnet has a standard threaded socket, which allows replacing the hook with any other accessory with a thread. Check the thread size in the product specification to select matching replacements.

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

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 and weaknesses of rare earth magnets.

Strengths

Besides their high retention, neodymium magnets are valued for these benefits:

They retain magnetic properties for nearly 10 years – the drop is just ~1% (in theory),
They are resistant to demagnetization induced by external magnetic fields,
Thanks to the glossy finish, the plating of nickel, gold, or silver gives an professional appearance,
Magnetic induction on the top side of the magnet remains extremely intense,
Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and are able to act (depending on the form) even at a temperature of 230°C or more...
In view of the option of free shaping and adaptation to specialized requirements, neodymium magnets can be created in a wide range of geometric configurations, which makes them more universal,
Significant place in advanced technology sectors – they are commonly used in mass storage devices, motor assemblies, advanced medical instruments, as well as technologically advanced constructions.
Thanks to concentrated force, small magnets offer high operating force, occupying minimum space,

Cons

Disadvantages of NdFeB magnets:

They are fragile upon heavy impacts. To avoid cracks, it is worth protecting magnets in a protective case. Such protection not only shields the magnet but also increases its resistance to damage
When exposed to high temperature, neodymium magnets suffer a drop in force. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size and shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
Due to the susceptibility of magnets to corrosion in a humid environment, we suggest using waterproof magnets made of rubber, plastic or other material resistant to moisture, when using outdoors
We suggest a housing - magnetic mount, due to difficulties in realizing threads inside the magnet and complicated forms.
Possible danger to health – tiny shards of magnets pose a threat, in case of ingestion, which becomes key in the aspect of protecting the youngest. Furthermore, small elements of these devices are able to disrupt the diagnostic process medical when they are in the body.
With mass production the cost of neodymium magnets can be a barrier,

Holding force characteristics

Maximum lifting capacity of the magnet – what it depends on?

Magnet power was determined for the most favorable conditions, including:

on a base made of mild steel, effectively closing the magnetic field
possessing a thickness of min. 10 mm to avoid saturation
with an ideally smooth contact surface
with total lack of distance (no paint)
under perpendicular force vector (90-degree angle)
in neutral thermal conditions

Lifting capacity in practice – influencing factors

Please note that the working load may be lower depending on the following factors, starting with the most relevant:

Distance (between the magnet and the metal), as even a very small clearance (e.g. 0.5 mm) can cause a reduction in lifting capacity by up to 50% (this also applies to paint, corrosion or debris).
Angle of force application – maximum parameter is obtained only during pulling at a 90° angle. The shear force of the magnet along the surface is typically many times smaller (approx. 1/5 of the lifting capacity).
Steel thickness – too thin sheet does not close the flux, causing part of the flux to be wasted to the other side.
Material composition – different alloys attracts identically. High carbon content worsen the attraction effect.
Surface structure – the smoother and more polished the plate, the larger the contact zone and higher the lifting capacity. Roughness acts like micro-gaps.
Temperature influence – high temperature reduces pulling force. Exceeding the limit temperature can permanently damage the magnet.

Holding force was tested on the plate surface of 20 mm thickness, when the force acted perpendicularly, whereas under parallel forces the holding force is lower. Moreover, even a minimal clearance between the magnet’s surface and the plate reduces the holding force.

Safety rules for work with neodymium magnets

Keep away from electronics

Remember: rare earth magnets generate a field that confuses precision electronics. Keep a separation from your mobile, tablet, and navigation systems.

Shattering risk

Beware of splinters. Magnets can explode upon uncontrolled impact, ejecting sharp fragments into the air. Eye protection is mandatory.

Nickel coating and allergies

Nickel alert: The Ni-Cu-Ni coating consists of nickel. If an allergic reaction happens, immediately stop working with magnets and wear gloves.

Flammability

Mechanical processing of NdFeB material poses a fire hazard. Magnetic powder reacts violently with oxygen and is hard to extinguish.

Adults only

Always store magnets away from children. Choking hazard is high, and the consequences of magnets connecting inside the body are very dangerous.

Medical implants

Health Alert: Neodymium magnets can turn off pacemakers and defibrillators. Do not approach if you have medical devices.

Serious injuries

Protect your hands. Two large magnets will snap together instantly with a force of several hundred kilograms, crushing everything in their path. Exercise extreme caution!

Operating temperature

Do not overheat. NdFeB magnets are sensitive to heat. If you require resistance above 80°C, look for HT versions (H, SH, UH).

Do not underestimate power

Handle magnets with awareness. Their huge power can surprise even experienced users. Stay alert and respect their power.

Keep away from computers

Do not bring magnets near a wallet, laptop, or screen. The magnetic field can destroy these devices and erase data from cards.

Security! Need more info? Read our article: Are neodymium magnets dangerous?

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

Product card - 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

Magnetic Field

Other proposals

UMH 48x11x65 [M6] / N38 - magnetic holder with hook

MPL 15x3x6 / N38 - lamellar magnet

RM R7 SUPER - 13000 Gs / N52 - magnetic distributor

RM R8 ULTRA - 13000 Gs / N52 - magnetic distributor

Strengths and weaknesses of rare earth magnets.

Strengths

Cons

Holding force characteristics

Maximum lifting capacity of the magnet – what it depends on?

Lifting capacity in practice – influencing factors

Safety rules for work with neodymium magnets

Keep away from electronics

Shattering risk

Nickel coating and allergies

Flammability

Adults only

Medical implants

Serious injuries

Operating temperature

Do not underestimate power

Keep away from computers

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C