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

Not sure which magnet to buy?

Contact us by phone +48 888 99 98 98 if you prefer get in touch through request form the contact page.
Specifications and form of a neodymium magnet can be checked using our magnetic mass calculator.

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Technical - 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

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%

Sustainability

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

Pounds (lbs)

Magnetic Induction

Induction (Gs)

Tesla (T)

Just fill in one field, and the converter calculate the rest automatically.

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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. Thanks to this, one magnet can perform many functions - sometimes be a hook, and sometimes a holder for a bolt.

The given value defines the maximum load when suspended under a thick, horizontal ceiling beam. When mounting on a wall (vertically), the holding force is much lower due to shear force (the magnet may slide).

The steel housing (cup) shields the magnetic field, directing all its power downwards, onto the contact surface. Additionally, steel protects the brittle magnet from cracking upon hitting the ceiling or beam.

For outdoor use (in rain), metal hangers may eventually develop a rusty coating over time. Metal elements can rust with constant contact with atmospheric moisture.

Strengths as well as weaknesses of rare earth magnets.

Advantages

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

They have unchanged lifting capacity, and over more than ten years their performance decreases symbolically – ~1% (according to theory),
Magnets effectively protect themselves against loss of magnetization caused by external fields,
By covering with a lustrous coating of nickel, the element acquires an professional look,
They are known for high magnetic induction at the operating surface, which affects their effectiveness,
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...
Due to the ability of free forming and customization to individualized requirements, NdFeB magnets can be modeled in a broad palette of shapes and sizes, which expands the range of possible applications,
Wide application in advanced technology sectors – they are commonly used in HDD drives, electric drive systems, diagnostic systems, and other advanced devices.
Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Cons

Disadvantages of NdFeB magnets:

At strong impacts they can crack, therefore we advise placing them in strong housings. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
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, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
They rust in a humid environment - during use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
We suggest cover - magnetic mount, due to difficulties in producing threads inside the magnet and complex forms.
Health risk related to microscopic parts of magnets are risky, when accidentally swallowed, which is particularly important in the context of child health protection. It is also worth noting that small elements of these products are able to disrupt the diagnostic process medical when they are in the body.
High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which increases costs of application in large quantities

Lifting parameters

Detachment force of the magnet in optimal conditions – what it depends on?

Breakaway force is the result of a measurement for the most favorable conditions, taking into account:

with the use of a sheet made of special test steel, ensuring maximum field concentration
possessing a massiveness of minimum 10 mm to avoid saturation
with a surface perfectly flat
with direct contact (no paint)
during detachment in a direction perpendicular to the plane
at ambient temperature room level

Determinants of lifting force in real conditions

Effective lifting capacity is influenced by specific conditions, including (from most important):

Distance – the presence of foreign body (paint, tape, gap) interrupts the magnetic circuit, which lowers power steeply (even by 50% at 0.5 mm).
Force direction – declared lifting capacity refers to pulling vertically. When slipping, the magnet holds much less (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 generating force.
Material composition – different alloys reacts the same. High carbon content weaken the attraction effect.
Surface structure – the smoother and more polished the surface, the better the adhesion and stronger the hold. Unevenness acts like micro-gaps.
Thermal factor – high temperature weakens pulling force. Exceeding the limit temperature can permanently demagnetize the magnet.

Lifting capacity was determined by applying a steel plate with a smooth surface of optimal thickness (min. 20 mm), under perpendicular detachment force, however under parallel forces the holding force is lower. Moreover, even a slight gap between the magnet and the plate lowers the holding force.

H&S for magnets

Medical implants

Patients with a pacemaker have to maintain an absolute distance from magnets. The magnetism can stop the operation of the life-saving device.

Maximum temperature

Control the heat. Exposing the magnet above 80 degrees Celsius will destroy its magnetic structure and pulling force.

Keep away from computers

Intense magnetic fields can erase data on payment cards, hard drives, and other magnetic media. Stay away of at least 10 cm.

Precision electronics

Navigation devices and mobile phones are highly susceptible to magnetism. Close proximity with a strong magnet can ruin the sensors in your phone.

Flammability

Machining of NdFeB material poses a fire risk. Magnetic powder oxidizes rapidly with oxygen and is hard to extinguish.

Fragile material

Despite the nickel coating, the material is brittle and not impact-resistant. Do not hit, as the magnet may crumble into sharp, dangerous pieces.

Adults only

NdFeB magnets are not suitable for play. Accidental ingestion of several magnets can lead to them connecting inside the digestive tract, which poses a direct threat to life and requires urgent medical intervention.

Crushing risk

Risk of injury: The attraction force is so immense that it can cause hematomas, pinching, and broken bones. Use thick gloves.

Caution required

Exercise caution. Neodymium magnets act from a distance and snap with huge force, often quicker than you can react.

Avoid contact if allergic

It is widely known that the nickel plating (the usual finish) is a common allergen. For allergy sufferers, refrain from direct skin contact and opt for versions in plastic housing.

Attention! Details about risks in the article: Magnet Safety Guide.

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

Technical - 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

Sustainability

Pulling force

Magnetic Induction

Check out more products

MPL 3x3x2 / N38 - lamellar magnet

MT 50x1.5x30000 - magnetic tape

MW 10x8 / N38 - cylindrical magnet

HH 32x7.8 [M5] / N38 - through hole magnetic holder

Strengths as well as weaknesses of rare earth magnets.

Advantages

Cons

Lifting parameters

Detachment force of the magnet in optimal conditions – what it depends on?

Determinants of lifting force in real conditions

H&S for magnets

Medical implants

Maximum temperature

Keep away from computers

Precision electronics

Flammability

Fragile material

Adults only

Crushing risk

Caution required

Avoid contact if allergic

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C