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UMS 48x18x8.5x11.5 / N38 - conical magnetic holder

conical magnetic holder

Catalog no 220403

GTIN/EAN: 5906301814221

5.00

Diameter Ø

48 mm [±1 mm]

cone dimension Ø

18x8.5 mm [±1 mm]

Height

11.5 mm [±1 mm]

Weight

125 g

Magnetization Direction

↑ axial

Load capacity

68.00 kg / 666.85 N

Coating

[NiCuNi] Nickel

technical parameters »

44.92 ZŁ with VAT / pcs + price for transport

36.52 ZŁ net + 23% VAT / pcs

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Product card - UMS 48x18x8.5x11.5 / N38 - conical magnetic holder

Specification / characteristics - UMS 48x18x8.5x11.5 / N38 - conical magnetic holder

properties
properties values
Cat. no. 220403
GTIN/EAN 5906301814221
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 48 mm [±1 mm]
cone dimension Ø 18x8.5 mm [±1 mm]
Height 11.5 mm [±1 mm]
Weight 125 g
Magnetization Direction ↑ axial
Load capacity ~ ? 68.00 kg / 666.85 N
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±1 mm

Magnetic properties of material N38

Specification / characteristics UMS 48x18x8.5x11.5 / 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
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: 220403-2026
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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.
Neodymium magnets are sintered ceramics, which means they are very hard but also brittle. Avoid forceful tightening when you feel resistance. The screw head should not protrude above the magnet surface, but it cannot burst it either.
Two identical magnets (e.g., both N) bought randomly will repel each other with mounting sides. 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.
This force is measured in ideal laboratory conditions when pulling at a 90-degree angle. If the magnet hangs vertically, gravity causes it to slide with much less load. Paint or veneer on metal also reduces effective attraction force.
The steel housing (cup/pot) acts as a magnetic shield, directing all power to the front of the holder. Furthermore, steel protects the brittle neodymium from mechanical damage when closing cabinets (impacts). The countersunk holder is a professional mounting solution with increased durability.

Pros as well as cons of neodymium magnets.

Pros

Apart from their superior holding force, neodymium magnets have these key benefits:
  • They retain full power for around ten years – the drop is just ~1% (according to analyses),
  • Magnets perfectly protect themselves against demagnetization caused by ambient magnetic noise,
  • The use of an shiny layer of noble metals (nickel, gold, silver) causes the element to be more visually attractive,
  • Magnets exhibit extremely high magnetic induction on the outer layer,
  • Thanks to resistance to high temperature, they are able to function (depending on the shape) even at temperatures up to 230°C and higher...
  • Considering the potential of free molding and customization to unique needs, magnetic components can be manufactured in a wide range of geometric configurations, which increases their versatility,
  • Universal use in high-tech industry – they are commonly used in data components, drive modules, medical devices, also modern systems.
  • Thanks to efficiency per cm³, small magnets offer high operating force, in miniature format,

Disadvantages

Problematic aspects of neodymium magnets: weaknesses and usage proposals
  • They are prone to damage upon too strong impacts. To avoid cracks, it is worth protecting magnets using a steel holder. Such protection not only protects the magnet but also improves its resistance to damage
  • When exposed to high temperature, neodymium magnets experience a drop in strength. 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 corrode. Therefore when using outdoors, we recommend using waterproof magnets made of rubber, plastic or other material protecting against moisture
  • We recommend casing - magnetic holder, due to difficulties in realizing threads inside the magnet and complex shapes.
  • Health risk resulting from small fragments of magnets can be dangerous, in case of ingestion, which is particularly important in the context of child health protection. It is also worth noting that small elements of these devices can complicate diagnosis medical when they are in the body.
  • With large orders the cost of neodymium magnets is a challenge,

Lifting parameters

Detachment force of the magnet in optimal conditions – what it depends on?

Breakaway force is the result of a measurement for the most favorable conditions, taking into account:
  • on a plate made of mild steel, effectively closing the magnetic flux
  • whose transverse dimension is min. 10 mm
  • characterized by lack of roughness
  • without the slightest insulating layer between the magnet and steel
  • under perpendicular force direction (90-degree angle)
  • at temperature room level

Lifting capacity in real conditions – factors

During everyday use, the real power depends on many variables, ranked from the most important:
  • Distance (betwixt the magnet and the metal), as even a tiny distance (e.g. 0.5 mm) leads to a drastic drop in force by up to 50% (this also applies to paint, rust or dirt).
  • Force direction – catalog parameter refers to pulling vertically. When applying parallel force, the magnet exhibits much less (often approx. 20-30% of nominal force).
  • Metal thickness – the thinner the sheet, the weaker the hold. Magnetic flux passes through the material instead of converting into lifting capacity.
  • Steel type – mild steel gives the best results. Alloy admixtures lower magnetic permeability and lifting capacity.
  • Surface quality – the more even the surface, the better the adhesion and stronger the hold. Roughness creates an air distance.
  • Thermal environment – temperature increase causes a temporary drop of induction. It is worth remembering the maximum operating temperature for a given model.

Lifting capacity was determined using a polished steel plate of optimal thickness (min. 20 mm), under perpendicular detachment force, in contrast under shearing force the lifting capacity is smaller. Additionally, even a small distance between the magnet’s surface and the plate reduces the lifting capacity.

Safety rules for work with NdFeB magnets
Finger safety

Mind your fingers. Two large magnets will join immediately with a force of several hundred kilograms, destroying everything in their path. Exercise extreme caution!

Beware of splinters

Despite metallic appearance, neodymium is brittle and cannot withstand shocks. Do not hit, as the magnet may shatter into sharp, dangerous pieces.

Magnetic interference

Navigation devices and mobile phones are highly sensitive to magnetic fields. Close proximity with a strong magnet can permanently damage the internal compass in your phone.

Thermal limits

Control the heat. Heating the magnet to high heat will permanently weaken its magnetic structure and pulling force.

Threat to electronics

Avoid bringing magnets close to a purse, laptop, or screen. The magnetism can destroy these devices and wipe information from cards.

Immense force

Handle magnets consciously. Their immense force can shock even professionals. Be vigilant and do not underestimate their power.

Implant safety

Health Alert: Strong magnets can turn off heart devices and defibrillators. Do not approach if you have medical devices.

Allergic reactions

Allergy Notice: The Ni-Cu-Ni coating consists of nickel. If an allergic reaction occurs, cease working with magnets and use protective gear.

Dust explosion hazard

Dust generated during machining of magnets is self-igniting. Avoid drilling into magnets without proper cooling and knowledge.

Danger to the youngest

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

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