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

conical magnetic holder

Catalog no 220327

GTIN/EAN: 5906301814177

5.00
Load capacity 6.00 kg / 58.84 N
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
Coating
[NiCuNi] Nickel
see properties »

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
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Contact us by phone +48 22 499 98 98 alternatively let us know through request form the contact page.
Force along with shape of magnetic components can be estimated with our power calculator.

Orders placed before 14:00 will be shipped the same business day.

Product card - 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

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 specification and ecology

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%

Environmental data

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

Pulling force

Magnetic Induction

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Countersunk magnets are indispensable in carpentry, furniture making, and modeling as hidden closures. The holder can be screwed directly to wood, wall, metal, or plastic. The steel cup strengthens the magnet force and protects it from cracking upon impact.
Despite the steel housing, the magnet itself is prone to cracking under strong point pressure. 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. If you need a pair, ask about availability of complementary sets or check 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. 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.
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. A bare ring has a dispersed field on both sides but is weaker in point holding.

Pros and cons of neodymium magnets.

Pros

Besides their tremendous strength, neodymium magnets offer the following advantages:
  • Their power remains stable, and after around ten years it drops only by ~1% (theoretically),
  • Magnets perfectly resist against loss of magnetization caused by external fields,
  • By covering with a lustrous layer of silver, the element presents an proper look,
  • They feature high magnetic induction at the operating surface, which increases their power,
  • Thanks to resistance to high temperature, they can operate (depending on the shape) even at temperatures up to 230°C and higher...
  • Thanks to flexibility in forming and the ability to modify to client solutions,
  • Wide application in high-tech industry – they serve a role in magnetic memories, electric motors, diagnostic systems, and modern systems.
  • Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in small dimensions, which makes them useful in miniature devices

Weaknesses

Disadvantages of NdFeB magnets:
  • At very strong impacts they can break, therefore we advise placing them in special holders. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • Neodymium magnets lose strength when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of power (a factor is the shape as well as dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are very resistant to heat
  • Magnets exposed to a humid environment can rust. Therefore while using outdoors, we suggest using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
  • We recommend cover - magnetic mount, due to difficulties in producing nuts inside the magnet and complicated shapes.
  • Health risk to health – tiny shards of magnets pose a threat, in case of ingestion, which is particularly important in the aspect of protecting the youngest. Additionally, small components of these products can be problematic in diagnostics medical in case of swallowing.
  • Due to expensive raw materials, their price is higher than average,

Lifting parameters

Maximum lifting force for a neodymium magnet – what contributes to it?

The declared magnet strength represents the limit force, measured under optimal environment, meaning:
  • using a plate made of mild steel, acting as a ideal flux conductor
  • possessing a massiveness of at least 10 mm to avoid saturation
  • characterized by smoothness
  • without any clearance between the magnet and steel
  • during detachment in a direction vertical to the mounting surface
  • at conditions approx. 20°C

What influences lifting capacity in practice

During everyday use, the actual holding force is determined by several key aspects, listed from the most important:
  • Space between surfaces – even a fraction of a millimeter of separation (caused e.g. by varnish or unevenness) diminishes the pulling force, often by half at just 0.5 mm.
  • Force direction – remember that the magnet holds strongest perpendicularly. Under shear forces, the holding force drops drastically, often to levels of 20-30% of the nominal value.
  • Substrate thickness – for full efficiency, the steel must be sufficiently thick. Thin sheet limits the attraction force (the magnet "punches through" it).
  • Material composition – not every steel reacts the same. Alloy additives weaken the attraction effect.
  • Surface finish – full contact is possible only on polished steel. Rough texture reduce the real contact area, weakening the magnet.
  • Temperature – heating the magnet causes a temporary drop of force. Check the maximum operating temperature for a given model.

Holding force was checked on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, however under attempts to slide the magnet the lifting capacity is smaller. In addition, even a slight gap between the magnet and the plate lowers the load capacity.

Precautions when working with neodymium magnets
Data carriers

Data protection: Strong magnets can ruin payment cards and sensitive devices (pacemakers, hearing aids, timepieces).

Dust is flammable

Powder produced during machining of magnets is combustible. Do not drill into magnets unless you are an expert.

Skin irritation risks

Warning for allergy sufferers: The Ni-Cu-Ni coating consists of nickel. If an allergic reaction appears, cease working with magnets and use protective gear.

Magnets are brittle

Despite metallic appearance, neodymium is delicate and cannot withstand shocks. Avoid impacts, as the magnet may shatter into sharp, dangerous pieces.

This is not a toy

Absolutely store magnets away from children. Choking hazard is significant, and the effects of magnets clamping inside the body are life-threatening.

Life threat

Patients with a pacemaker should maintain an large gap from magnets. The magnetic field can stop the operation of the life-saving device.

Do not overheat magnets

Watch the temperature. Heating the magnet to high heat will permanently weaken its magnetic structure and strength.

Threat to navigation

GPS units and mobile phones are highly susceptible to magnetic fields. Direct contact with a powerful NdFeB magnet can decalibrate the internal compass in your phone.

Pinching danger

Risk of injury: The pulling power is so immense that it can result in hematomas, pinching, and broken bones. Protective gloves are recommended.

Handling rules

Before use, read the rules. Sudden snapping can destroy the magnet or injure your hand. Be predictive.

Safety First! Looking for details? Check our post: Are neodymium magnets dangerous?