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

product 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

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Contact us by phone +48 888 99 98 98 otherwise contact us through our online form the contact section.
Force and shape of magnets can be checked using our force calculator.

Orders placed before 14:00 will be shipped the same business day.

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 specification and ecology

Material specification

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

Measurement Calculator

Force (pull)

Force in lbs

Magnetic Field

Gauss (Gs)

Tesla (T)

Put a figure in a single field to see the conversion in the other units right away.

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35.01 ZŁ brutto / pcs

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. This gives huge application flexibility and allows adapting the holder to current needs.

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. 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 as well as cons of Nd₂Fe₁₄B magnets.

Strengths

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

They retain magnetic properties for almost ten years – the drop is just ~1% (according to analyses),
Neodymium magnets prove to be exceptionally resistant to demagnetization caused by external field sources,
The use of an refined coating of noble metals (nickel, gold, silver) causes the element to look better,
Magnets exhibit impressive magnetic induction on the working surface,
Through (adequate) combination of ingredients, they can achieve high thermal strength, allowing for action at temperatures approaching 230°C and above...
Thanks to modularity in designing and the ability to modify to client solutions,
Versatile presence in future technologies – they are used in magnetic memories, electric motors, medical equipment, and industrial machines.
Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in compact dimensions, which enables their usage in miniature devices

Disadvantages

Disadvantages of neodymium magnets:

At strong impacts they can crack, therefore we recommend placing them in strong housings. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
NdFeB magnets lose power when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of power (a factor is the shape as well as 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 - during use outdoors we advise using waterproof magnets e.g. in rubber, plastic
Limited ability of making threads in the magnet and complicated forms - preferred is a housing - magnetic holder.
Potential hazard to health – tiny shards of magnets are risky, when accidentally swallowed, which becomes key in the context of child safety. Additionally, tiny parts of these devices are able to be problematic in diagnostics medical after entering the body.
High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which can limit application in large quantities

Lifting parameters

Highest magnetic holding force – what it depends on?

Information about lifting capacity is the result of a measurement for ideal contact conditions, including:

with the contact of a sheet made of low-carbon steel, ensuring full magnetic saturation
with a cross-section of at least 10 mm
with a plane cleaned and smooth
with total lack of distance (no paint)
under perpendicular force direction (90-degree angle)
in stable room temperature

What influences lifting capacity in practice

Real force is affected by working environment parameters, such as (from priority):

Gap (between the magnet and the plate), as even a very small clearance (e.g. 0.5 mm) results in a drastic drop in force by up to 50% (this also applies to paint, corrosion or debris).
Loading method – declared lifting capacity refers to detachment vertically. When slipping, the magnet exhibits much less (typically approx. 20-30% of nominal force).
Substrate thickness – for full efficiency, the steel must be adequately massive. Paper-thin metal restricts the lifting capacity (the magnet "punches through" it).
Steel type – mild steel gives the best results. Alloy admixtures lower magnetic permeability and holding force.
Plate texture – smooth surfaces ensure maximum contact, which increases force. Uneven metal reduce efficiency.
Thermal environment – temperature increase results in weakening of force. It is worth remembering the maximum operating temperature for a given model.

Lifting capacity testing was carried out on plates with a smooth surface of optimal thickness, under perpendicular forces, in contrast under shearing force the holding force is lower. Moreover, even a slight gap between the magnet and the plate reduces the load capacity.

Safe handling of NdFeB magnets

Cards and drives

Avoid bringing magnets close to a purse, computer, or screen. The magnetism can permanently damage these devices and erase data from cards.

Implant safety

Warning for patients: Strong magnetic fields disrupt electronics. Maintain minimum 30 cm distance or request help to work with the magnets.

Power loss in heat

Watch the temperature. Heating the magnet above 80 degrees Celsius will ruin its properties and strength.

Do not underestimate power

Use magnets consciously. Their immense force can surprise even experienced users. Stay alert and respect their force.

Choking Hazard

NdFeB magnets are not suitable for play. Eating several magnets can lead to them attracting across intestines, which constitutes a critical condition and requires urgent medical intervention.

Shattering risk

Despite metallic appearance, the material is brittle and cannot withstand shocks. Do not hit, as the magnet may shatter into hazardous fragments.

Warning for allergy sufferers

Some people have a hypersensitivity to Ni, which is the common plating for NdFeB magnets. Prolonged contact might lead to a rash. It is best to use safety gloves.

Mechanical processing

Powder generated during cutting of magnets is flammable. Do not drill into magnets unless you are an expert.

Crushing force

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

Magnetic interference

GPS units and smartphones are extremely susceptible to magnetic fields. Direct contact with a powerful NdFeB magnet can decalibrate the sensors in your phone.

Safety First! Looking for details? Read our article: Why 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

Material specification

Environmental data

Force (pull)

Magnetic Field

View more products

MPL 50x50x10 / N38 - lamellar magnet

MW 70x60 / N38 - cylindrical magnet

MPL 40x15x5 / N38 - lamellar magnet

MPL 45x25x10 / N38 - lamellar magnet

Pros as well as cons of Nd2Fe14B magnets.

Strengths

Disadvantages

Lifting parameters

Highest magnetic holding force – what it depends on?

What influences lifting capacity in practice

Safe handling of NdFeB magnets

Cards and drives

Implant safety

Power loss in heat

Do not underestimate power

Choking Hazard

Shattering risk

Warning for allergy sufferers

Mechanical processing

Crushing force

Magnetic interference

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

Pros as well as cons of Nd₂Fe₁₄B magnets.