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

check technical 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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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

Technical and environmental data

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

Magnet pull force

Kilograms (kg)

Force (N)

Pounds (lbs)

Magnetic Field

Induction (Gs)

Tesla (T)

Type data in one of the inputs, to see the rest will recalculate in real-time.

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They serve to create mobile suspension points without the need to drill holes in beams. It is a universal hanger that you can move to another place at any time without a trace.

The magnet has a standard threaded socket, which allows replacing the hook with any other accessory with a thread. This gives huge application flexibility and allows adapting the holder to current needs.

You will get the greatest force by mounting the magnet on a thick, smooth steel surface vertically. If you hang the magnet on a wall, the real capacity is approx. 20-30% of the nominal value.

The steel housing (cup) shields the magnetic field, directing all its power downwards, onto the contact surface. The housing ensures mechanical durability, which is important in industrial and assembly conditions.

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.

Advantages as well as disadvantages of rare earth magnets.

Strengths

Besides their magnetic performance, neodymium magnets are valued for these benefits:

They have stable power, and over more than ten years their performance decreases symbolically – ~1% (according to theory),
Magnets effectively resist against demagnetization caused by external fields,
In other words, due to the aesthetic surface of gold, the element gains a professional look,
They feature high magnetic induction at the operating surface, which increases their power,
Neodymium magnets are characterized by very high magnetic induction on the magnet surface and can work (depending on the form) even at a temperature of 230°C or more...
Thanks to flexibility in forming and the ability to adapt to client solutions,
Significant place in innovative solutions – they serve a role in HDD drives, drive modules, medical equipment, and industrial machines.
Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in small dimensions, which allows their use in compact constructions

Cons

Cons of neodymium magnets: application proposals

To avoid cracks under impact, we suggest using special steel housings. Such a solution secures the magnet and simultaneously increases its durability.
We warn that neodymium magnets can lose their strength at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
Due to the susceptibility of magnets to corrosion in a humid environment, we recommend using waterproof magnets made of rubber, plastic or other material immune to moisture, when using outdoors
Due to limitations in producing nuts and complex shapes in magnets, we recommend using a housing - magnetic holder.
Potential hazard to health – tiny shards of magnets are risky, if swallowed, which becomes key in the aspect of protecting the youngest. Additionally, small elements of these devices can disrupt the diagnostic process medical when they are in the body.
Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Pull force analysis

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

The load parameter shown represents the limit force, recorded under optimal environment, specifically:

with the contact of a yoke made of special test steel, guaranteeing full magnetic saturation
possessing a thickness of min. 10 mm to avoid saturation
with an polished contact surface
with direct contact (no impurities)
during pulling in a direction vertical to the mounting surface
at standard ambient temperature

Practical lifting capacity: influencing factors

In real-world applications, the actual holding force is determined by many variables, ranked from the most important:

Gap (betwixt the magnet and the plate), since even a tiny distance (e.g. 0.5 mm) leads to a decrease in force by up to 50% (this also applies to paint, corrosion or debris).
Load vector – maximum parameter is obtained only during pulling at a 90° angle. The shear force of the magnet along the surface is standardly many times lower (approx. 1/5 of the lifting capacity).
Element thickness – to utilize 100% power, the steel must be sufficiently thick. Paper-thin metal limits the attraction force (the magnet "punches through" it).
Material type – ideal substrate is pure iron steel. Hardened steels may generate lower lifting capacity.
Surface structure – the smoother and more polished the surface, the better the adhesion and stronger the hold. Roughness acts like micro-gaps.
Thermal conditions – neodymium magnets have a negative temperature coefficient. At higher temperatures they lose power, and in frost they can be stronger (up to a certain limit).

Holding force was checked on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, in contrast under parallel forces the load capacity is reduced by as much as fivefold. Additionally, even a small distance between the magnet and the plate reduces the load capacity.

Warnings

Adults only

Only for adults. Small elements can be swallowed, leading to serious injuries. Store out of reach of children and animals.

Respect the power

Before starting, read the rules. Uncontrolled attraction can destroy the magnet or hurt your hand. Think ahead.

Medical implants

For implant holders: Strong magnetic fields disrupt medical devices. Maintain minimum 30 cm distance or ask another person to work with the magnets.

Threat to electronics

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

GPS Danger

GPS units and smartphones are highly susceptible to magnetism. Close proximity with a strong magnet can ruin the sensors in your phone.

Nickel coating and allergies

Studies show that the nickel plating (the usual finish) is a common allergen. For allergy sufferers, avoid direct skin contact and choose coated magnets.

Protective goggles

Despite the nickel coating, neodymium is delicate and not impact-resistant. Avoid impacts, as the magnet may crumble into sharp, dangerous pieces.

Dust is flammable

Drilling and cutting of neodymium magnets poses a fire risk. Magnetic powder reacts violently with oxygen and is difficult to extinguish.

Thermal limits

Avoid heat. Neodymium magnets are sensitive to heat. If you need operation above 80°C, inquire about special high-temperature series (H, SH, UH).

Crushing risk

Risk of injury: The pulling power is so immense that it can result in hematomas, pinching, and even bone fractures. Use thick gloves.

Danger! Details about hazards in the article: Safety of working with magnets.

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

Material specification

Sustainability

Magnet pull force

Magnetic Field

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Advantages as well as disadvantages of rare earth magnets.

Strengths

Cons

Pull force analysis

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

Practical lifting capacity: influencing factors

Warnings

Adults only

Respect the power

Medical implants

Threat to electronics

GPS Danger

Nickel coating and allergies

Protective goggles

Dust is flammable

Thermal limits

Crushing risk

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C