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 parameters »

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

Not sure which magnet to buy?

Call us now +48 888 99 98 98 otherwise let us know by means of contact form through our site.
Lifting power and shape of neodymium magnets can be verified on our online calculation tool.

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Technical of the product - 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%

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

Magnet Unit Converter

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This type of holder is perfect for mounting magnetic latches in cabinets, doors, and flaps. 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.

Neodymium magnets are sintered ceramics, which means they are very hard but also brittle. We recommend tightening manually with feeling (screwdriver), not an impact driver. Using too large a countersunk screw may cause the magnetic ring to crack.

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. 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). Paint or veneer on metal also reduces effective attraction force.

A magnet in a housing is stronger on one side (from the chamfer side) than a bare magnet of the same dimensions. It is a more durable and safer solution in everyday use than a bare ring. A bare ring has a dispersed field on both sides but is weaker in point holding.

Strengths and weaknesses of Nd₂Fe₁₄B magnets.

Strengths

Besides their high retention, neodymium magnets are valued for these benefits:

They have constant strength, and over more than ten years their attraction force decreases symbolically – ~1% (in testing),
They are noted for resistance to demagnetization induced by external magnetic fields,
Thanks to the reflective finish, the layer of Ni-Cu-Ni, gold-plated, or silver-plated gives an aesthetic appearance,
Neodymium magnets ensure maximum magnetic induction on a small surface, which ensures high operational effectiveness,
Through (appropriate) combination of ingredients, they can achieve high thermal strength, enabling functioning at temperatures approaching 230°C and above...
Thanks to freedom in designing and the ability to modify to specific needs,
Key role in modern technologies – they are commonly used in computer drives, electric drive systems, medical equipment, as well as industrial machines.
Relatively small size with high pulling force – neodymium magnets offer high power in compact dimensions, which enables their usage in miniature devices

Weaknesses

Disadvantages of neodymium magnets:

At strong impacts they can crack, therefore we advise placing them in steel cases. A metal housing provides additional protection against damage and increases the magnet's durability.
When exposed to high temperature, neodymium magnets suffer a drop in power. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size, as well as 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 during using outdoors, we advise using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
Due to limitations in producing threads and complex shapes in magnets, we recommend using casing - magnetic mount.
Health risk resulting from small fragments of magnets can be dangerous, if swallowed, which is particularly important in the context of child safety. Additionally, small components of these magnets are able to complicate diagnosis medical after entering the body.
Due to complex production process, their price is higher than average,

Lifting parameters

Maximum lifting force for a neodymium magnet – what affects it?

The lifting capacity listed is a result of laboratory testing executed under standard conditions:

with the application of a yoke made of low-carbon steel, guaranteeing maximum field concentration
possessing a thickness of minimum 10 mm to ensure full flux closure
with an ground touching surface
with direct contact (without impurities)
during pulling in a direction vertical to the mounting surface
in neutral thermal conditions

Determinants of lifting force in real conditions

Real force impacted by specific conditions, such as (from priority):

Gap between magnet and steel – every millimeter of separation (caused e.g. by varnish or unevenness) diminishes the magnet efficiency, often by half at just 0.5 mm.
Pull-off angle – note that the magnet has greatest strength perpendicularly. Under sliding down, the holding force drops significantly, often to levels of 20-30% of the maximum value.
Substrate thickness – for full efficiency, the steel must be sufficiently thick. Thin sheet restricts the attraction force (the magnet "punches through" it).
Chemical composition of the base – low-carbon steel gives the best results. Higher carbon content reduce magnetic permeability and lifting capacity.
Surface finish – full contact is obtained only on polished steel. Any scratches and bumps create air cushions, weakening the magnet.
Temperature – temperature increase causes a temporary drop of force. Check the maximum operating temperature for a given model.

Holding force was tested on the plate surface of 20 mm thickness, when the force acted perpendicularly, in contrast under shearing force the load capacity is reduced by as much as 5 times. In addition, even a slight gap between the magnet’s surface and the plate reduces the load capacity.

Precautions when working with neodymium magnets

Data carriers

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

Fire warning

Mechanical processing of neodymium magnets poses a fire risk. Neodymium dust oxidizes rapidly with oxygen and is difficult to extinguish.

Keep away from children

Strictly keep magnets away from children. Ingestion danger is high, and the effects of magnets clamping inside the body are tragic.

Medical implants

For implant holders: Strong magnetic fields disrupt electronics. Keep at least 30 cm distance or request help to work with the magnets.

Beware of splinters

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

Do not underestimate power

Be careful. Neodymium magnets attract from a distance and connect with massive power, often faster than you can move away.

Allergic reactions

It is widely known that nickel (the usual finish) is a potent allergen. If your skin reacts to metals, refrain from direct skin contact and choose versions in plastic housing.

Power loss in heat

Do not overheat. NdFeB magnets are susceptible to temperature. If you require operation above 80°C, look for HT versions (H, SH, UH).

Impact on smartphones

Remember: neodymium magnets generate a field that confuses sensitive sensors. Keep a separation from your mobile, device, and GPS.

Bodily injuries

Pinching hazard: The pulling power is so great that it can cause hematomas, pinching, and even bone fractures. Protective gloves are recommended.

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

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

Technical of the product - 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

Sustainability

Magnet pull force

Magnetic Induction

Other proposals

MPL 50x20x20 / N38 - lamellar magnet

MW 12x4 / N52 - cylindrical magnet

SM 25x375 [2xM8] / N52 - magnetic separator

MP 41x15x10 / N38 - ring magnet

Strengths and weaknesses of Nd2Fe14B magnets.

Strengths

Weaknesses

Lifting parameters

Maximum lifting force for a neodymium magnet – what affects it?

Determinants of lifting force in real conditions

Precautions when working with neodymium magnets

Data carriers

Fire warning

Keep away from children

Medical implants

Beware of splinters

Do not underestimate power

Allergic reactions

Power loss in heat

Impact on smartphones

Bodily injuries

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

Strengths and weaknesses of Nd₂Fe₁₄B magnets.