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

conical magnetic holder

Catalog no 220328

GTIN/EAN: 5906301814184

5.00
Load capacity 14.00 kg / 137.29 N
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
Coating
[NiCuNi] Nickel
product specifications »

9.72 zł with VAT / pcs + price for transport

7.90 zł net + 23% VAT / pcs

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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

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

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: 220328-2026
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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 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. Avoid forceful tightening when you feel resistance. 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. In our offer, we try to mark or pair holders if explicitly stated in the description. 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. When selecting a magnet for a cabinet, remember that the air gap (e.g., bumpers, seals) weakens the grip.
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 as well as weaknesses of rare earth magnets.

Advantages

In addition to their magnetic efficiency, neodymium magnets provide the following advantages:
  • They have unchanged lifting capacity, and over nearly 10 years their performance decreases symbolically – ~1% (according to theory),
  • They retain their magnetic properties even under strong external field,
  • In other words, due to the metallic layer of gold, the element is aesthetically pleasing,
  • The surface of neodymium magnets generates a strong magnetic field – this is one of their assets,
  • Through (appropriate) combination of ingredients, they can achieve high thermal strength, allowing for action at temperatures approaching 230°C and above...
  • Considering the option of free molding and adaptation to individualized needs, neodymium magnets can be produced in a broad palette of geometric configurations, which makes them more universal,
  • Fundamental importance in modern technologies – they are utilized in hard drives, electromotive mechanisms, medical equipment, also other advanced devices.
  • Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Limitations

Drawbacks and weaknesses of neodymium magnets and ways of using them
  • They are fragile upon too strong impacts. To avoid cracks, it is worth securing 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
  • Magnets exposed to a humid environment can rust. Therefore when using outdoors, we recommend using waterproof magnets made of rubber, plastic or other material protecting against moisture
  • Limited possibility of making threads in the magnet and complex forms - recommended is cover - mounting mechanism.
  • Potential hazard related to microscopic parts of magnets are risky, in case of ingestion, which becomes key in the aspect of protecting the youngest. It is also worth noting that small components of these products are able to complicate diagnosis medical when they are in the body.
  • Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Holding force characteristics

Maximum holding power of the magnet – what contributes to it?

Holding force of 14.00 kg is a result of laboratory testing executed under specific, ideal conditions:
  • with the contact of a yoke made of special test steel, ensuring full magnetic saturation
  • with a cross-section no less than 10 mm
  • characterized by lack of roughness
  • with direct contact (no paint)
  • under axial force direction (90-degree angle)
  • at temperature approx. 20 degrees Celsius

What influences lifting capacity in practice

Please note that the application force will differ influenced by the following factors, in order of importance:
  • Distance – existence of foreign body (rust, tape, air) acts as an insulator, which lowers capacity rapidly (even by 50% at 0.5 mm).
  • Force direction – remember that the magnet has greatest strength perpendicularly. Under shear forces, the capacity drops significantly, often to levels of 20-30% of the nominal value.
  • Metal thickness – thin material does not allow full use of the magnet. Magnetic flux penetrates through instead of generating force.
  • Chemical composition of the base – mild steel gives the best results. Higher carbon content lower magnetic properties and lifting capacity.
  • Plate texture – smooth surfaces guarantee perfect abutment, which increases field saturation. Rough surfaces reduce efficiency.
  • Temperature influence – hot environment weakens pulling force. Too high temperature can permanently damage the magnet.

Lifting capacity testing was performed on a smooth plate of optimal thickness, under a perpendicular pulling force, however under parallel forces the holding force is lower. Moreover, even a small distance between the magnet and the plate lowers the lifting capacity.

Warnings
Warning for heart patients

For implant holders: Powerful magnets affect medical devices. Keep at least 30 cm distance or ask another person to work with the magnets.

Beware of splinters

Despite the nickel coating, neodymium is delicate and not impact-resistant. Avoid impacts, as the magnet may crumble into hazardous fragments.

This is not a toy

Always keep magnets out of reach of children. Risk of swallowing is significant, and the effects of magnets clamping inside the body are fatal.

Caution required

Before use, check safety instructions. Sudden snapping can destroy the magnet or injure your hand. Think ahead.

Electronic hazard

Very strong magnetic fields can corrupt files on credit cards, HDDs, and storage devices. Stay away of min. 10 cm.

Dust explosion hazard

Fire hazard: Neodymium dust is highly flammable. Avoid machining magnets in home conditions as this may cause fire.

Thermal limits

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

Bone fractures

Risk of injury: The pulling power is so great that it can result in blood blisters, crushing, and broken bones. Use thick gloves.

Compass and GPS

An intense magnetic field interferes with the functioning of magnetometers in smartphones and navigation systems. Keep magnets near a smartphone to avoid damaging the sensors.

Nickel allergy

A percentage of the population suffer from a contact allergy to Ni, which is the standard coating for NdFeB magnets. Prolonged contact can result in an allergic reaction. We strongly advise wear safety gloves.

Safety First! Need more info? Read our article: Why are neodymium magnets dangerous?