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

check parameters »

6.46 ZŁ with VAT / pcs + price for transport

5.25 ZŁ net + 23% VAT / pcs

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Technical details - 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

Technical and environmental data

Elemental analysis

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: 220327-2026

Measurement Calculator

Force (pull)

Force in lbs

Field Strength

Gauss (Gs)

Tesla (T)

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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.

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.

For two magnets screwed with cones facing each other (faces) to attract, they must have different polarity. Often a more convenient and cheaper solution is using one magnet and a steel washer (plate) as an armature. A set of magnet + plate is cheaper and holds just as strongly.

This force is measured in ideal laboratory conditions when pulling at a 90-degree angle. To increase friction and prevent sliding, it is worth sticking a piece of rubber or anti-slip tape on the magnet. Paint or veneer on metal also reduces effective attraction force.

Thanks to the metal cup, the magnetic field is concentrated on the active side, which significantly increases force. The housing absorbs impacts, preventing the magnet from crumbling and cracking. The countersunk holder is a professional mounting solution with increased durability.

Strengths and weaknesses of neodymium magnets.

Pros

Besides their exceptional strength, neodymium magnets offer the following advantages:

They have unchanged lifting capacity, and over more than ten years their attraction force decreases symbolically – ~1% (according to theory),
They have excellent resistance to magnetic field loss when exposed to external fields,
By using a lustrous layer of gold, the element presents an nice look,
They feature high magnetic induction at the operating surface, which affects their effectiveness,
Due to their durability and thermal resistance, neodymium magnets can operate (depending on the shape) even at high temperatures reaching 230°C or more...
Possibility of precise modeling and optimizing to precise applications,
Versatile presence in modern technologies – they find application in mass storage devices, electromotive mechanisms, medical equipment, as well as technologically advanced constructions.
Thanks to efficiency per cm³, small magnets offer high operating force, in miniature format,

Cons

What to avoid - cons of neodymium magnets and ways of using them

At very 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.
We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
Magnets exposed to a humid environment can rust. Therefore during using outdoors, we recommend using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
We suggest casing - magnetic mount, due to difficulties in producing nuts inside the magnet and complex shapes.
Possible danger related to microscopic parts of magnets can be dangerous, if swallowed, which gains importance in the context of child safety. Additionally, small components of these magnets can disrupt the diagnostic process medical when they are in the body.
High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which can limit application in large quantities

Pull force analysis

Best holding force of the magnet in ideal parameters – what it depends on?

The lifting capacity listed is a result of laboratory testing executed under the following configuration:

on a plate made of mild steel, effectively closing the magnetic field
possessing a massiveness of at least 10 mm to ensure full flux closure
characterized by smoothness
with direct contact (without coatings)
during detachment in a direction vertical to the plane
at ambient temperature approx. 20 degrees Celsius

Key elements affecting lifting force

In practice, the real power is determined by a number of factors, listed from crucial:

Space between surfaces – even a fraction of a millimeter of distance (caused e.g. by veneer or dirt) significantly weakens the pulling force, often by half at just 0.5 mm.
Pull-off angle – note that the magnet holds strongest perpendicularly. Under sliding down, the holding force drops drastically, often to levels of 20-30% of the maximum value.
Plate thickness – insufficiently thick steel does not accept the full field, causing part of the flux to be escaped to the other side.
Material type – ideal substrate is high-permeability steel. Stainless steels may have worse magnetic properties.
Surface finish – full contact is obtained only on smooth steel. Any scratches and bumps create air cushions, weakening the magnet.
Thermal conditions – NdFeB sinters have a negative temperature coefficient. At higher temperatures they lose power, and in frost gain strength (up to a certain limit).

Lifting capacity testing was performed on plates with a smooth surface of optimal thickness, under a perpendicular pulling force, whereas under shearing force the load capacity is reduced by as much as fivefold. Moreover, even a slight gap between the magnet’s surface and the plate decreases the load capacity.

Warnings

Immense force

Handle with care. Rare earth magnets attract from a long distance and connect with huge force, often quicker than you can move away.

Dust explosion hazard

Powder produced during grinding of magnets is flammable. Avoid drilling into magnets without proper cooling and knowledge.

Medical implants

Warning for patients: Powerful magnets affect electronics. Maintain at least 30 cm distance or ask another person to handle the magnets.

Magnet fragility

Despite the nickel coating, the material is delicate and not impact-resistant. Do not hit, as the magnet may shatter into hazardous fragments.

Heat sensitivity

Standard neodymium magnets (N-type) lose magnetization when the temperature goes above 80°C. Damage is permanent.

Swallowing risk

NdFeB magnets are not toys. Swallowing several magnets can lead to them connecting inside the digestive tract, which constitutes a direct threat to life and necessitates urgent medical intervention.

Phone sensors

Note: neodymium magnets produce a field that interferes with precision electronics. Maintain a safe distance from your mobile, device, and GPS.

Threat to electronics

Data protection: Strong magnets can damage data carriers and sensitive devices (pacemakers, medical aids, mechanical watches).

Serious injuries

Risk of injury: The pulling power is so great that it can cause blood blisters, pinching, and even bone fractures. Use thick gloves.

Allergy Warning

Studies show that nickel (the usual finish) is a common allergen. If your skin reacts to metals, avoid touching magnets with bare hands or choose versions in plastic housing.

Important! Details about risks in the article: Safety of working with magnets.

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

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

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Elemental analysis

Ecology and recycling (GPSR)

Force (pull)

Field Strength

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MPL 20x5x3 / N38 - lamellar magnet

MP 25x5x5 / N38 - ring magnet

UMC 32x11/3x8 / N38 - cylindrical magnetic holder

UMGGW 66x8.5 [M8] GW / N38 - magnetic holder rubber internal thread

Strengths and weaknesses of neodymium magnets.

Pros

Cons

Pull force analysis

Best holding force of the magnet in ideal parameters – what it depends on?

Key elements affecting lifting force

Warnings

Immense force

Dust explosion hazard

Medical implants

Magnet fragility

Heat sensitivity

Swallowing risk

Phone sensors

Threat to electronics

Serious injuries

Allergy Warning

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C