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UMS 16x6.5x3.5x5 / N38 - conical magnetic holder

conical magnetic holder

Catalog no 220326

GTIN/EAN: 5906301814160

5.00

Diameter Ø

16 mm [±1 mm]

cone dimension Ø

6.5x3.5 mm [±1 mm]

Height

5 mm [±1 mm]

Weight

5.5 g

Magnetization Direction

↑ axial

Load capacity

5.00 kg / 49.03 N

Coating

[NiCuNi] Nickel

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4.48 ZŁ with VAT / pcs + price for transport

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Technical - UMS 16x6.5x3.5x5 / N38 - conical magnetic holder

Specification / characteristics - UMS 16x6.5x3.5x5 / N38 - conical magnetic holder

properties
properties values
Cat. no. 220326
GTIN/EAN 5906301814160
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 16 mm [±1 mm]
cone dimension Ø 6.5x3.5 mm [±1 mm]
Height 5 mm [±1 mm]
Weight 5.5 g
Magnetization Direction ↑ axial
Load capacity ~ ? 5.00 kg / 49.03 N
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±1 mm

Magnetic properties of material N38

Specification / characteristics UMS 16x6.5x3.5x5 / 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 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%
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: 220326-2026
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Force (pull)
Magnetic Field
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This type of holder is perfect for mounting magnetic latches in cabinets, doors, and flaps. The holder can be screwed directly to wood, wall, metal, or plastic. Model UMS 16x6.5x3.5x5 / N38 will successfully hold inspection doors, tools in the workshop, or shop display elements.
Despite the steel housing, the magnet itself is prone to cracking under strong point pressure. It is best to use a screw with a countersunk head perfectly matched to the hole. 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. 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., 5.00 kg) refers to the perpendicular force needed to detach the magnet from thick steel. If the magnet hangs vertically, gravity causes it to slide with much less load. When selecting a magnet for a cabinet, remember that the air gap (e.g., bumpers, seals) weakens the grip.
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. The countersunk holder is a professional mounting solution with increased durability.

Advantages and disadvantages of Nd2Fe14B magnets.

Advantages

Besides their tremendous pulling force, neodymium magnets offer the following advantages:
  • They retain magnetic properties for around ten years – the drop is just ~1% (according to analyses),
  • They are resistant to demagnetization induced by presence of other magnetic fields,
  • By using a shiny layer of nickel, the element gains an proper look,
  • Magnetic induction on the surface of the magnet turns out to be very high,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
  • Considering the possibility of flexible molding and customization to custom projects, neodymium magnets can be created in a wide range of forms and dimensions, which amplifies use scope,
  • Significant place in innovative solutions – they are utilized in mass storage devices, electric drive systems, medical devices, as well as complex engineering applications.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in tiny dimensions, which enables their usage in small systems

Weaknesses

Disadvantages of neodymium magnets:
  • At very strong impacts they can crack, therefore we advise placing them in steel cases. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • We warn that neodymium magnets can lose their power at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
  • Due to the susceptibility of magnets to corrosion in a humid environment, we suggest using waterproof magnets made of rubber, plastic or other material stable to moisture, in case of application outdoors
  • Limited possibility of producing nuts in the magnet and complex shapes - preferred is casing - mounting mechanism.
  • Potential hazard related to microscopic parts of magnets are risky, if swallowed, which gains importance in the aspect of protecting the youngest. It is also worth noting that small elements of these magnets can disrupt the diagnostic process medical after entering the body.
  • Due to neodymium price, their price exceeds standard values,

Lifting parameters

Breakaway strength of the magnet in ideal conditions – what it depends on?

The lifting capacity listed is a result of laboratory testing conducted under standard conditions:
  • on a block made of structural steel, effectively closing the magnetic field
  • whose thickness equals approx. 10 mm
  • with a plane perfectly flat
  • without any air gap between the magnet and steel
  • for force applied at a right angle (in the magnet axis)
  • in neutral thermal conditions

Key elements affecting lifting force

Effective lifting capacity is affected by working environment parameters, mainly (from most important):
  • Gap (between the magnet and the plate), because even a tiny clearance (e.g. 0.5 mm) leads to a drastic drop in force by up to 50% (this also applies to varnish, rust or debris).
  • Loading method – catalog parameter refers to detachment vertically. When applying parallel force, the magnet holds significantly lower power (typically approx. 20-30% of maximum force).
  • Base massiveness – too thin steel does not accept the full field, causing part of the flux to be lost to the other side.
  • Steel grade – the best choice is pure iron steel. Stainless steels may have worse magnetic properties.
  • Surface structure – the smoother and more polished the plate, the better the adhesion and higher the lifting capacity. Roughness acts like micro-gaps.
  • Operating temperature – NdFeB sinters have a negative temperature coefficient. At higher temperatures they are weaker, and in frost they can be stronger (up to a certain limit).

Lifting capacity was measured using a steel plate with a smooth surface of suitable thickness (min. 20 mm), under perpendicular detachment force, whereas under attempts to slide the magnet the load capacity is reduced by as much as 75%. In addition, even a small distance between the magnet’s surface and the plate reduces the load capacity.

Precautions when working with neodymium magnets
Medical implants

Life threat: Strong magnets can turn off heart devices and defibrillators. Do not approach if you have electronic implants.

Immense force

Use magnets consciously. Their powerful strength can shock even professionals. Stay alert and respect their force.

Hand protection

Watch your fingers. Two powerful magnets will snap together immediately with a force of massive weight, crushing everything in their path. Be careful!

Nickel coating and allergies

Some people experience a hypersensitivity to Ni, which is the standard coating for neodymium magnets. Extended handling may cause an allergic reaction. We recommend use safety gloves.

Adults only

Neodymium magnets are not intended for children. Accidental ingestion of several magnets can lead to them connecting inside the digestive tract, which constitutes a severe health hazard and requires urgent medical intervention.

Dust explosion hazard

Mechanical processing of NdFeB material carries a risk of fire hazard. Neodymium dust reacts violently with oxygen and is hard to extinguish.

Impact on smartphones

An intense magnetic field negatively affects the functioning of compasses in smartphones and navigation systems. Keep magnets near a device to prevent breaking the sensors.

Eye protection

Watch out for shards. Magnets can explode upon uncontrolled impact, ejecting sharp fragments into the air. We recommend safety glasses.

Power loss in heat

Control the heat. Exposing the magnet to high heat will ruin its properties and strength.

Cards and drives

Equipment safety: Strong magnets can ruin payment cards and sensitive devices (heart implants, medical aids, timepieces).

Caution! Want to know more? Check our post: Are neodymium magnets dangerous?