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UMS 75x19x10.5x18 / N38 - conical magnetic holder

conical magnetic holder

Catalog no 220405

GTIN/EAN: 5906301814245

5.00

Diameter Ø

75 mm [±1 mm]

cone dimension Ø

19x10.5 mm [±1 mm]

Height

18 mm [±1 mm]

Weight

465 g

Magnetization Direction

↑ axial

Load capacity

162.00 kg / 1588.68 N

Coating

[NiCuNi] Nickel

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125.56 ZŁ with VAT / pcs + price for transport

102.08 ZŁ net + 23% VAT / pcs

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Product card - UMS 75x19x10.5x18 / N38 - conical magnetic holder

Specification / characteristics - UMS 75x19x10.5x18 / N38 - conical magnetic holder

properties
properties values
Cat. no. 220405
GTIN/EAN 5906301814245
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 75 mm [±1 mm]
cone dimension Ø 19x10.5 mm [±1 mm]
Height 18 mm [±1 mm]
Weight 465 g
Magnetization Direction ↑ axial
Load capacity ~ ? 162.00 kg / 1588.68 N
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±1 mm

Magnetic properties of material N38

Specification / characteristics UMS 75x19x10.5x18 / 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
Material specification
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: 220405-2026
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Pulling force
Magnetic Induction
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This type of holder is perfect for mounting magnetic latches in cabinets, doors, and flaps. Thanks to the hole with a chamfer (conical), the screw head hides in the magnet, ensuring a flat contact surface. The steel cup strengthens the magnet force and protects it from cracking upon impact.
Remember that neodymium breaks easily if the screw is tightened too hard. 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. 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 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. 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. 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 neodymium magnets.

Advantages

Besides their remarkable field intensity, neodymium magnets offer the following advantages:
  • They retain full power for around 10 years – the drop is just ~1% (based on simulations),
  • Magnets effectively protect themselves against loss of magnetization caused by foreign field sources,
  • By using a shiny coating of nickel, the element gains an elegant look,
  • The surface of neodymium magnets generates a unique magnetic field – this is a distinguishing feature,
  • Thanks to resistance to high temperature, they can operate (depending on the shape) even at temperatures up to 230°C and higher...
  • Possibility of detailed shaping as well as modifying to specific requirements,
  • Key role in high-tech industry – they are used in computer drives, electric motors, medical devices, also modern systems.
  • Compactness – despite small sizes they generate large force, making them ideal for precision applications

Cons

Cons of neodymium magnets and ways of using them
  • Brittleness is one of their disadvantages. Upon strong impact they can fracture. We advise keeping them in a strong case, which not only protects them against impacts but also raises their durability
  • Neodymium magnets decrease their power under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures up to 230°C
  • They rust in a humid environment. For use outdoors we advise using waterproof magnets e.g. in rubber, plastic
  • We suggest a housing - magnetic mechanism, due to difficulties in producing nuts inside the magnet and complex shapes.
  • Health risk to health – tiny shards of magnets pose a threat, if swallowed, which is particularly important in the context of child safety. Furthermore, small elements of these devices can disrupt the diagnostic process medical after entering the body.
  • Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Holding force characteristics

Maximum lifting force for a neodymium magnet – what affects it?

Information about lifting capacity is the result of a measurement for ideal contact conditions, including:
  • with the use of a sheet made of special test steel, guaranteeing maximum field concentration
  • possessing a thickness of at least 10 mm to ensure full flux closure
  • characterized by lack of roughness
  • with direct contact (without impurities)
  • under axial force vector (90-degree angle)
  • in temp. approx. 20°C

Lifting capacity in real conditions – factors

It is worth knowing that the working load may be lower depending on elements below, in order of importance:
  • Gap between surfaces – even a fraction of a millimeter of distance (caused e.g. by veneer or dirt) diminishes the pulling force, often by half at just 0.5 mm.
  • Load vector – maximum parameter is available only during perpendicular pulling. The shear force of the magnet along the plate is standardly several times smaller (approx. 1/5 of the lifting capacity).
  • Steel thickness – too thin plate does not accept the full field, causing part of the flux to be wasted to the other side.
  • Steel type – mild steel attracts best. Alloy admixtures reduce magnetic properties and lifting capacity.
  • Surface finish – full contact is possible only on smooth steel. Rough texture create air cushions, reducing force.
  • Temperature – temperature increase results in weakening of induction. Check the thermal limit for a given model.

Lifting capacity testing was carried out on plates with a smooth surface of suitable thickness, under a perpendicular pulling force, however under parallel forces the load capacity is reduced by as much as fivefold. Moreover, even a small distance between the magnet and the plate reduces the load capacity.

Safe handling of NdFeB magnets
Power loss in heat

Regular neodymium magnets (grade N) lose magnetization when the temperature goes above 80°C. This process is irreversible.

No play value

Only for adults. Tiny parts can be swallowed, leading to serious injuries. Store away from children and animals.

Mechanical processing

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

Threat to navigation

Note: rare earth magnets generate a field that disrupts sensitive sensors. Keep a safe distance from your phone, tablet, and navigation systems.

Crushing force

Pinching hazard: The pulling power is so great that it can cause hematomas, crushing, and broken bones. Use thick gloves.

Avoid contact if allergic

Some people experience a hypersensitivity to nickel, which is the common plating for NdFeB magnets. Frequent touching may cause dermatitis. We suggest wear safety gloves.

Electronic hazard

Powerful magnetic fields can destroy records on payment cards, hard drives, and storage devices. Maintain a gap of min. 10 cm.

Health Danger

People with a heart stimulator must maintain an safe separation from magnets. The magnetic field can stop the functioning of the life-saving device.

Beware of splinters

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

Respect the power

Use magnets with awareness. Their huge power can surprise even professionals. Be vigilant and respect their power.

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