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

Product available Ships tomorrow

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

technical specifications »

6.46 ZŁ with VAT / pcs + price for transport

5.25 ZŁ net + 23% VAT / pcs

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Lifting power as well as shape of a magnet can be estimated using our magnetic mass calculator.

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Technical - 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

Chemical composition

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: 220327-2026

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It is the most popular solution for creating aesthetic, invisible door locks. 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.

Neodymium magnets are sintered ceramics, which means they are very hard but also brittle. 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.

To create a pair (magnet-magnet), you need one holder with an N pole on the chamfer and another with an S pole. 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.

The declared capacity (e.g., 6.00 kg) refers to the perpendicular force needed to detach the magnet from thick steel. If the magnet hangs vertically, gravity causes it to slide with much less load. When selecting a magnet for a cabinet, remember that the air gap (e.g., bumpers, seals) weakens the grip.

A magnet in a housing is stronger on one side (from the chamfer side) than a bare magnet of the same dimensions. The housing absorbs impacts, preventing the magnet from crumbling and cracking. A bare ring has a dispersed field on both sides but is weaker in point holding.

Strengths and weaknesses of neodymium magnets.

Benefits

Apart from their notable power, neodymium magnets have these key benefits:

They virtually do not lose power, because even after ten years the decline in efficiency is only ~1% (based on calculations),
Neodymium magnets are distinguished by exceptionally resistant to magnetic field loss caused by magnetic disturbances,
By applying a reflective layer of silver, the element has an elegant look,
Magnets are characterized by maximum magnetic induction on the outer layer,
Neodymium magnets are characterized by very high magnetic induction on the magnet surface and can function (depending on the form) even at a temperature of 230°C or more...
Thanks to the potential of precise molding and customization to specialized needs, NdFeB magnets can be created in a broad palette of forms and dimensions, which increases their versatility,
Key role in advanced technology sectors – they are utilized in computer drives, brushless drives, precision medical tools, as well as industrial machines.
Thanks to efficiency per cm³, small magnets offer high operating force, in miniature format,

Disadvantages

Characteristics of disadvantages of neodymium magnets: application proposals

They are fragile upon heavy impacts. To avoid cracks, it is worth protecting magnets using a steel holder. Such protection not only shields the magnet but also improves its resistance to damage
When exposed to high temperature, neodymium magnets suffer a drop in power. 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
They oxidize in a humid environment - during use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
Due to limitations in realizing nuts and complex shapes in magnets, we recommend using casing - magnetic holder.
Health risk to health – tiny shards of magnets are risky, in case of ingestion, which becomes key in the aspect of protecting the youngest. Furthermore, tiny parts of these products can be problematic in diagnostics medical when they are in the body.
With budget limitations the cost of neodymium magnets is a challenge,

Lifting parameters

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 specific, ideal conditions:

with the application of a sheet made of special test steel, ensuring full magnetic saturation
whose thickness equals approx. 10 mm
with a surface cleaned and smooth
without any air gap between the magnet and steel
for force applied at a right angle (pull-off, not shear)
in stable room temperature

Determinants of practical lifting force of a magnet

In real-world applications, the real power results from several key aspects, listed from crucial:

Distance (between the magnet and the metal), because even a very small clearance (e.g. 0.5 mm) results in a reduction in lifting capacity by up to 50% (this also applies to varnish, rust or debris).
Loading method – catalog parameter refers to detachment vertically. When slipping, the magnet exhibits much less (typically approx. 20-30% of nominal force).
Plate thickness – too thin steel does not close the flux, causing part of the flux to be escaped to the other side.
Material type – the best choice is pure iron steel. Cast iron may have worse magnetic properties.
Surface condition – smooth surfaces guarantee perfect abutment, which increases field saturation. Uneven metal weaken the grip.
Thermal factor – high temperature reduces pulling force. Too high temperature can permanently demagnetize the magnet.

Lifting capacity was assessed using a steel plate with a smooth surface of suitable thickness (min. 20 mm), under perpendicular detachment force, whereas under attempts to slide the magnet the load capacity is reduced by as much as 75%. Additionally, even a slight gap between the magnet’s surface and the plate decreases the lifting capacity.

Warnings

Permanent damage

Do not overheat. Neodymium magnets are sensitive to heat. If you need operation above 80°C, inquire about HT versions (H, SH, UH).

Sensitization to coating

A percentage of the population experience a sensitization to nickel, which is the common plating for neodymium magnets. Frequent touching can result in skin redness. We suggest wear protective gloves.

Fragile material

Despite the nickel coating, the material is delicate and cannot withstand shocks. Do not hit, as the magnet may shatter into sharp, dangerous pieces.

Medical implants

People with a ICD should maintain an safe separation from magnets. The magnetic field can disrupt the operation of the life-saving device.

Fire risk

Drilling and cutting of neodymium magnets carries a risk of fire hazard. Neodymium dust reacts violently with oxygen and is hard to extinguish.

Protect data

Very strong magnetic fields can destroy records on credit cards, HDDs, and other magnetic media. Maintain a gap of at least 10 cm.

Threat to navigation

Note: rare earth magnets produce a field that confuses precision electronics. Maintain a safe distance from your phone, tablet, and GPS.

Choking Hazard

Only for adults. Small elements can be swallowed, causing severe trauma. Keep out of reach of kids and pets.

Crushing force

Large magnets can crush fingers instantly. Under no circumstances put your hand betwixt two strong magnets.

Safe operation

Be careful. Neodymium magnets act from a distance and connect with huge force, often faster than you can react.

Attention! Looking for details? Check our post: Why are neodymium magnets dangerous?

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

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

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Chemical composition

Sustainability

Force (pull)

Magnetic Field

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Strengths and weaknesses of neodymium magnets.

Benefits

Disadvantages

Lifting parameters

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

Determinants of practical lifting force of a magnet

Warnings

Permanent damage

Sensitization to coating

Fragile material

Medical implants

Fire risk

Protect data

Threat to navigation

Choking Hazard

Crushing force

Safe operation

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C