UMS 25x10.5x5.5x8 / N38 - conical magnetic holder

Product available Ships tomorrow

UMS 25x10.5x5.5x8 / 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 220328

GTIN/EAN: 5906301814184

5.00

Diameter Ø

25 mm [±1 mm]

cone dimension Ø

10.5x5.5 mm [±1 mm]

Height

8 mm [±1 mm]

Weight

21 g

Magnetization Direction

↑ axial

Load capacity

14.00 kg / 137.29 N

Coating

[NiCuNi] Nickel

product details »

9.72 ZŁ with VAT / pcs + price for transport

7.90 ZŁ net + 23% VAT / pcs

bulk discounts:

Need more?

price from 1 pcs

7.90 ZŁ

9.72 ZŁ

price from 50 pcs

6.72 ZŁ

8.26 ZŁ

price from 150 pcs

5.14 ZŁ

6.32 ZŁ

Carbon Footprint – environmental impact GPSR Regulation – product safety

Want to negotiate?

Call us +48 888 99 98 98 alternatively send us a note through form the contact page.
Weight as well as form of a magnet can be verified with our our magnetic calculator.

Same-day processing for orders placed before 14:00.

Physical properties - UMS 25x10.5x5.5x8 / N38 - conical magnetic holder

Specification / characteristics - UMS 25x10.5x5.5x8 / N38 - conical magnetic holder

properties

properties	values
Cat. no.	220328
GTIN/EAN	5906301814184
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	25 mm [±1 mm]
cone dimension Ø	10.5x5.5 mm [±1 mm]
Height	8 mm [±1 mm]
Weight	21 g
Magnetization Direction	↑ axial
Load capacity ~ ?	14.00 kg / 137.29 N
Coating	[NiCuNi] Nickel
Manufacturing Tolerance	±1 mm

Magnetic properties of material N38

Specification / characteristics UMS 25x10.5x5.5x8 / 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%

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: 220328-2026

Measurement Calculator

Pulling force

Force in kg

Force (N)

lbs

Magnetic Field

Induction (Gs)

Input your value in just one slot to see the conversion for all other units immediately.

Other proposals

Product available Ships tomorrow

MW 5x5 / N38 - cylindrical magnet

0.394 ZŁ brutto / pcs

Product available Ships tomorrow

SM 18x200 [2xM5] / N42 - magnetic separator

442.80 ZŁ brutto / pcs

Product available Ships tomorrow

XT-6 magnetyzery do silników - BENZYNA + POWIETRZE - XT-6 magnetizer

94.99 ZŁ brutto / pcs

Product available Ships tomorrow

SM 25x150 [2xM8] / N42 - magnetic separator

393.60 ZŁ brutto / pcs

Countersunk magnets are indispensable in carpentry, furniture making, and modeling as hidden closures. The ability to flush the screw with the magnet surface allows for perfect closing without gaps. Model UMS 25x10.5x5.5x8 / 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. We recommend tightening manually with feeling (screwdriver), not an impact driver. 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. Mounting a magnet to a plate eliminates the problem of matching poles and is easier.

This value is the maximum achievement a magnet can obtain on a thick sheet. 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. It is a more durable and safer solution in everyday use than a bare ring. The countersunk holder is a professional mounting solution with increased durability.

Pros and cons of Nd₂Fe₁₄B magnets.

Benefits

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

They retain full power for around ten years – the drop is just ~1% (based on simulations),
Magnets effectively defend themselves against loss of magnetization caused by foreign field sources,
By using a shiny layer of nickel, the element acquires an aesthetic look,
The surface of neodymium magnets generates a powerful magnetic field – this is a distinguishing feature,
Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their shape) at temperatures up to 230°C and above...
Thanks to versatility in designing and the ability to modify to unusual requirements,
Wide application in electronics industry – they are commonly used in computer drives, electric motors, diagnostic systems, as well as complex engineering applications.
Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Disadvantages

Disadvantages of NdFeB magnets:

To avoid cracks upon strong impacts, we recommend using special steel holders. Such a solution secures the magnet and simultaneously increases its durability.
When exposed to high temperature, neodymium magnets experience a drop in force. Often, when the temperature exceeds 80°C, their power 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
When exposed to humidity, magnets usually rust. For applications outside, it is recommended to use protective magnets, such as those in rubber or plastics, which prevent oxidation as well as corrosion.
Due to limitations in producing nuts and complex forms in magnets, we recommend using cover - magnetic mount.
Health risk resulting from small fragments of magnets can be dangerous, if swallowed, which is particularly important in the aspect of protecting the youngest. Additionally, tiny parts of these products are able to be problematic in diagnostics medical after entering the body.
High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which increases costs of application in large quantities

Pull force analysis

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

The force parameter is a measurement result conducted under the following configuration:

with the application of a yoke made of low-carbon steel, ensuring full magnetic saturation
whose transverse dimension is min. 10 mm
characterized by lack of roughness
without the slightest clearance between the magnet and steel
for force applied at a right angle (pull-off, not shear)
at ambient temperature room level

Magnet lifting force in use – key factors

Holding efficiency impacted by working environment parameters, mainly (from most important):

Gap between magnet and steel – even a fraction of a millimeter of distance (caused e.g. by veneer or dirt) diminishes the magnet efficiency, often by half at just 0.5 mm.
Loading method – catalog parameter refers to detachment vertically. When slipping, the magnet holds much less (typically approx. 20-30% of nominal force).
Steel thickness – too thin sheet does not accept the full field, causing part of the power to be lost to the other side.
Material type – the best choice is pure iron steel. Stainless steels may generate lower lifting capacity.
Surface finish – full contact is possible only on polished steel. Any scratches and bumps reduce the real contact area, weakening the magnet.
Thermal conditions – NdFeB sinters have a sensitivity to temperature. At higher temperatures they lose power, and at low temperatures they can be stronger (up to a certain limit).

Holding force was tested on the plate surface of 20 mm thickness, when a perpendicular force was applied, in contrast under attempts to slide the magnet the holding force is lower. Additionally, even a small distance between the magnet’s surface and the plate decreases the load capacity.

Safe handling of NdFeB magnets

Life threat

Medical warning: Strong magnets can deactivate heart devices and defibrillators. Stay away if you have electronic implants.

Crushing risk

Mind your fingers. Two powerful magnets will snap together immediately with a force of several hundred kilograms, crushing anything in their path. Be careful!

No play value

NdFeB magnets are not intended for children. Eating several magnets may result in them connecting inside the digestive tract, which poses a critical condition and necessitates urgent medical intervention.

Mechanical processing

Machining of NdFeB material carries a risk of fire risk. Neodymium dust oxidizes rapidly with oxygen and is hard to extinguish.

Handling guide

Exercise caution. Neodymium magnets attract from a distance and snap with massive power, often faster than you can move away.

GPS Danger

GPS units and smartphones are highly sensitive to magnetism. Close proximity with a powerful NdFeB magnet can permanently damage the internal compass in your phone.

Thermal limits

Standard neodymium magnets (grade N) lose power when the temperature surpasses 80°C. This process is irreversible.

Keep away from computers

Do not bring magnets near a purse, computer, or TV. The magnetic field can permanently damage these devices and erase data from cards.

Skin irritation risks

Warning for allergy sufferers: The nickel-copper-nickel coating contains nickel. If an allergic reaction occurs, cease handling magnets and use protective gear.

Shattering risk

Beware of splinters. Magnets can explode upon violent connection, launching shards into the air. We recommend safety glasses.

Security! Need more info? Check our post: Why are neodymium magnets dangerous?

UMS 25x10.5x5.5x8 / N38 - conical magnetic holder

Physical properties - UMS 25x10.5x5.5x8 / N38 - conical magnetic holder

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Chemical composition

Ecology and recycling (GPSR)

Pulling force

Magnetic Field

Other proposals

MW 5x5 / N38 - cylindrical magnet

SM 18x200 [2xM5] / N42 - magnetic separator

XT-6 magnetyzery do silników - BENZYNA + POWIETRZE - XT-6 magnetizer

SM 25x150 [2xM8] / N42 - magnetic separator

Pros and cons of Nd2Fe14B magnets.

Benefits

Disadvantages

Pull force analysis

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

Magnet lifting force in use – key factors

Safe handling of NdFeB magnets

Life threat

Crushing risk

No play value

Mechanical processing

Handling guide

GPS Danger

Thermal limits

Keep away from computers

Skin irritation risks

Shattering risk

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

Pros and cons of Nd₂Fe₁₄B magnets.