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: 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

view 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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Lifting power as well as appearance of a neodymium magnet can be analyzed with our force 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%

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: 220327-2025

Measurement Calculator

Force (pull)

Force (N)

lbs

Magnetic Induction

Gauss (Gs)

Tesla (T)

Enter a value into any field, to see the rest will update automatically.

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Countersunk magnets are indispensable in carpentry, furniture making, and modeling as hidden closures. Thanks to the hole with a chamfer (conical), the screw head hides in the magnet, ensuring a flat contact surface. Model UMS 20x8.6x4.5x7 / N38 will successfully hold inspection doors, tools in the workshop, or shop display elements.

Remember that neodymium breaks easily if the screw is tightened too hard. It is best to use a screw with a countersunk head perfectly matched to the hole. Using too large a countersunk screw may cause the magnetic ring to crack.

For two magnets screwed with cones facing each other (faces) to attract, they must have different polarity. If you need a pair, ask about availability of complementary sets or check the description. Mounting a magnet to a plate eliminates the problem of matching poles and is easier.

This force is measured in ideal laboratory conditions when pulling at a 90-degree angle. If the magnet hangs vertically, gravity causes it to slide with much less load. Paint or veneer on metal also reduces effective attraction force.

The steel housing (cup/pot) acts as a magnetic shield, directing all power to the front of the holder. The housing absorbs impacts, preventing the magnet from crumbling and cracking. The countersunk holder is a professional mounting solution with increased durability.

Pros as well as cons of rare earth magnets.

Benefits

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

They do not lose magnetism, even over around 10 years – the reduction in lifting capacity is only ~1% (based on measurements),
They do not lose their magnetic properties even under strong external field,
By applying a reflective layer of nickel, the element gains an professional look,
Magnetic induction on the working part of the magnet remains strong,
Due to their durability and thermal resistance, neodymium magnets can operate (depending on the form) even at high temperatures reaching 230°C or more...
Due to the option of accurate molding and customization to specialized solutions, neodymium magnets can be created in a wide range of geometric configurations, which increases their versatility,
Fundamental importance in innovative solutions – they serve a role in hard drives, electric drive systems, diagnostic systems, and multitasking production systems.
Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Limitations

Cons of neodymium magnets: application proposals

They are fragile upon too strong impacts. To avoid cracks, it is worth securing magnets using a steel holder. Such protection not only protects the magnet but also improves its resistance to damage
When exposed to high temperature, neodymium magnets suffer a drop in strength. Often, when the temperature exceeds 80°C, their power 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
Magnets exposed to a humid environment can corrode. Therefore when using outdoors, we suggest using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
Due to limitations in producing nuts and complex forms in magnets, we recommend using cover - magnetic mechanism.
Potential hazard to health – tiny shards of magnets pose a threat, if swallowed, which is particularly important in the aspect of protecting the youngest. Additionally, small components of these products are able to be problematic in diagnostics medical in case of swallowing.
Due to neodymium price, their price is relatively high,

Lifting parameters

Maximum magnetic pulling force – what it depends on?

The force parameter is a theoretical maximum value performed under standard conditions:

with the contact of a yoke made of special test steel, guaranteeing maximum field concentration
with a cross-section minimum 10 mm
with a plane cleaned and smooth
with total lack of distance (no coatings)
under perpendicular force vector (90-degree angle)
at temperature room level

Practical lifting capacity: influencing factors

It is worth knowing that the application force may be lower depending on elements below, starting with the most relevant:

Distance (betwixt the magnet and the metal), as even a microscopic clearance (e.g. 0.5 mm) leads to a reduction in lifting capacity by up to 50% (this also applies to paint, corrosion or debris).
Load vector – maximum parameter is reached only during pulling at a 90° angle. The resistance to sliding of the magnet along the surface is typically several times smaller (approx. 1/5 of the lifting capacity).
Plate thickness – too thin plate does not accept the full field, causing part of the flux to be wasted to the other side.
Metal type – not every steel reacts the same. High carbon content weaken the interaction with the magnet.
Surface finish – ideal contact is obtained only on smooth steel. Any scratches and bumps reduce the real contact area, reducing force.
Temperature influence – high temperature reduces pulling force. Exceeding the limit temperature can permanently demagnetize the magnet.

Holding force was checked on the plate surface of 20 mm thickness, when the force acted perpendicularly, whereas under attempts to slide the magnet the load capacity is reduced by as much as fivefold. In addition, even a slight gap between the magnet and the plate reduces the lifting capacity.

Safety rules for work with NdFeB magnets

Protect data

Equipment safety: Strong magnets can ruin data carriers and sensitive devices (heart implants, medical aids, mechanical watches).

GPS and phone interference

A strong magnetic field interferes with the functioning of compasses in smartphones and GPS navigation. Keep magnets close to a smartphone to avoid damaging the sensors.

Protective goggles

NdFeB magnets are sintered ceramics, which means they are very brittle. Collision of two magnets leads to them cracking into small pieces.

Do not give to children

Product intended for adults. Small elements can be swallowed, causing serious injuries. Keep out of reach of kids and pets.

Implant safety

Patients with a ICD must maintain an safe separation from magnets. The magnetic field can interfere with the operation of the life-saving device.

Maximum temperature

Standard neodymium magnets (N-type) undergo demagnetization when the temperature surpasses 80°C. Damage is permanent.

Dust is flammable

Fire warning: Neodymium dust is highly flammable. Do not process magnets without safety gear as this risks ignition.

Bone fractures

Large magnets can break fingers in a fraction of a second. Under no circumstances place your hand betwixt two strong magnets.

Powerful field

Use magnets consciously. Their immense force can surprise even experienced users. Stay alert and do not underestimate their force.

Sensitization to coating

Allergy Notice: The nickel-copper-nickel coating contains nickel. If an allergic reaction occurs, immediately stop handling magnets and wear gloves.

Attention! Need more info? Check our post: 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

Sustainability

Force (pull)

Magnetic Induction

Check out more offers

MP 5x2.7/1.2x5 Z / N38 - ring magnet

SM 25x225 [2xM8] / N42 - magnetic separator

SM 25x375 [2xM8] / N42 - magnetic separator

MW 8x20 / N38 - cylindrical magnet

Pros as well as cons of rare earth magnets.

Benefits

Limitations

Lifting parameters

Maximum magnetic pulling force – what it depends on?

Practical lifting capacity: influencing factors

Safety rules for work with NdFeB magnets

Protect data

GPS and phone interference

Protective goggles

Do not give to children

Implant safety

Maximum temperature

Dust is flammable

Bone fractures

Powerful field

Sensitization to coating

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C