UMS 20x8.6x4.5x7 / N38 - conical magnetic holder

Product available Ships today (order by 14:00)

UMS 20x8.6x4.5x7 / N38 - conical magnetic holder

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

conical magnetic holder

Catalog no 220327

GTIN/EAN: 5906301814177

5.00

Diameter Ø

20 mm [±1 mm]

cone dimension Ø

8.6x4.5 mm [±1 mm]

Height

7 mm [±1 mm]

Weight

12 g

Magnetization Direction

↑ axial

Load capacity

6.00 kg / 58.84 N

Coating

[NiCuNi] Nickel

see properties »

6.46 ZŁ with VAT / pcs + price for transport

5.25 ZŁ net + 23% VAT / pcs

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Carbon Footprint – environmental impact GPSR Regulation – product safety

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Parameters and structure of neodymium magnets can be estimated with our modular calculator.

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Physical properties - UMS 20x8.6x4.5x7 / N38 - conical magnetic holder

Specification / characteristics - UMS 20x8.6x4.5x7 / N38 - conical magnetic holder

properties

properties	values
Cat. no.	220327
GTIN/EAN	5906301814177
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]
cone dimension Ø	8.6x4.5 mm [±1 mm]
Height	7 mm [±1 mm]
Weight	12 g
Magnetization Direction	↑ axial
Load capacity ~ ?	6.00 kg / 58.84 N
Coating	[NiCuNi] Nickel
Manufacturing Tolerance	±1 mm

Magnetic properties of material N38

Specification / characteristics UMS 20x8.6x4.5x7 / N38 - conical magnetic holder

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%

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: 220327-2025

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It is the most popular solution for creating aesthetic, invisible door locks. The ability to flush the screw with the magnet surface allows for perfect closing without gaps. Model UMS 20x8.6x4.5x7 / N38 will successfully hold inspection doors, tools in the workshop, or shop display elements.

Despite the steel housing, the magnet itself is prone to cracking under strong point pressure. It is best to use a screw with a countersunk head perfectly matched to the hole. The screw head should not protrude above the magnet surface, but it cannot burst it either.

Two identical magnets (e.g., both N) bought randomly will repel each other with mounting sides. In our offer, we try to mark or pair holders if explicitly stated in the description. Mounting a magnet to a plate eliminates the problem of matching poles and is easier.

The declared capacity (e.g., 6.00 kg) refers to the perpendicular force needed to detach the magnet from thick steel. In practice, when mounted on a wall (shear force), the magnet will hold significantly less (approx. 20-30% of nominal). When selecting a magnet for a cabinet, remember that the air gap (e.g., bumpers, seals) weakens the grip.

Thanks to the metal cup, the magnetic field is concentrated on the active side, which significantly increases force. Furthermore, steel protects the brittle neodymium from mechanical damage when closing cabinets (impacts). A bare ring has a dispersed field on both sides but is weaker in point holding.

Pros as well as cons of rare earth magnets.

Pros

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

They retain attractive force for nearly 10 years – the loss is just ~1% (based on simulations),
They possess excellent resistance to magnetic field loss as a result of opposing magnetic fields,
In other words, due to the aesthetic surface of gold, the element looks attractive,
The surface of neodymium magnets generates a concentrated magnetic field – this is a distinguishing feature,
Thanks to resistance to high temperature, they are capable of working (depending on the form) even at temperatures up to 230°C and higher...
Possibility of individual shaping as well as modifying to specific needs,
Key role in high-tech industry – they find application in data components, electric drive systems, precision medical tools, and industrial machines.
Thanks to efficiency per cm³, small magnets offer high operating force, with minimal size,

Weaknesses

Characteristics of disadvantages of neodymium magnets and proposals for their use:

To avoid cracks under impact, we recommend using special steel housings. Such a solution secures the magnet and simultaneously improves its durability.
Neodymium magnets lose their strength under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures up to 230°C
Magnets exposed to a humid environment can corrode. Therefore while using outdoors, we recommend using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
Due to limitations in creating nuts and complex shapes in magnets, we recommend using casing - magnetic mechanism.
Health risk to health – tiny shards of magnets pose a threat, in case of ingestion, which is particularly important in the context of child safety. It is also worth noting that tiny parts of these magnets can be problematic in diagnostics medical after entering the body.
Due to neodymium price, their price exceeds standard values,

Pull force analysis

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

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

on a block made of structural steel, effectively closing the magnetic field
whose thickness reaches at least 10 mm
characterized by smoothness
under conditions of no distance (metal-to-metal)
under vertical force direction (90-degree angle)
at room temperature

Impact of factors on magnetic holding capacity in practice

In practice, the actual lifting capacity is determined by a number of factors, presented from crucial:

Space between magnet and steel – even a fraction of a millimeter of separation (caused e.g. by veneer or dirt) drastically reduces the magnet efficiency, often by half at just 0.5 mm.
Direction of force – maximum parameter is reached only during perpendicular pulling. The resistance to sliding of the magnet along the plate is standardly many times smaller (approx. 1/5 of the lifting capacity).
Wall thickness – the thinner the sheet, the weaker the hold. Magnetic flux penetrates through instead of generating force.
Metal type – different alloys attracts identically. High carbon content worsen the interaction with the magnet.
Surface condition – smooth surfaces ensure maximum contact, which improves force. Uneven metal reduce efficiency.
Thermal environment – heating the magnet results in weakening of force. Check the thermal limit for a given model.

Lifting capacity testing was performed on a smooth plate of suitable thickness, under a perpendicular pulling force, in contrast under shearing force the holding force is lower. Moreover, even a minimal clearance between the magnet and the plate lowers the lifting capacity.

Safety rules for work with neodymium magnets

Product not for children

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

Finger safety

Large magnets can smash fingers instantly. Under no circumstances place your hand betwixt two strong magnets.

Warning for allergy sufferers

Some people have a contact allergy to nickel, which is the standard coating for NdFeB magnets. Frequent touching can result in a rash. We suggest wear safety gloves.

Thermal limits

Do not overheat. NdFeB magnets are sensitive to temperature. If you need operation above 80°C, ask us about special high-temperature series (H, SH, UH).

Machining danger

Dust produced during cutting of magnets is flammable. Avoid drilling into magnets without proper cooling and knowledge.

Material brittleness

Neodymium magnets are sintered ceramics, meaning they are very brittle. Collision of two magnets leads to them shattering into small pieces.

Safe distance

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

Impact on smartphones

GPS units and smartphones are extremely sensitive to magnetic fields. Direct contact with a strong magnet can decalibrate the internal compass in your phone.

Warning for heart patients

Life threat: Strong magnets can turn off heart devices and defibrillators. Do not approach if you have medical devices.

Powerful field

Handle with care. Rare earth magnets act from a long distance and connect with massive power, often faster than you can move away.

Security! Looking for details? Read our article: Why are neodymium magnets dangerous?

UMS 20x8.6x4.5x7 / N38 - conical magnetic holder

Physical properties - UMS 20x8.6x4.5x7 / N38 - conical magnetic holder

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Material specification

Ecology and recycling (GPSR)

Force (pull)

Field Strength

Other offers

SM 25x175 [2xM8] / N52 - magnetic separator

UMC 48x11/7x11.5 / N38 - cylindrical magnetic holder

UMH 16x5x32 [M4] / N38 - magnetic holder with hook

MW 15x4 / N38 - cylindrical magnet

Pros as well as cons of rare earth magnets.

Pros

Weaknesses

Pull force analysis

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

Impact of factors on magnetic holding capacity in practice

Safety rules for work with neodymium magnets

Product not for children

Finger safety

Warning for allergy sufferers

Thermal limits

Machining danger

Material brittleness

Safe distance

Impact on smartphones

Warning for heart patients

Powerful field

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C