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

conical magnetic holder

Catalog no 220405

GTIN/EAN: 5906301814245

5.00
Load capacity 162.00 kg / 1588.68 N
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
Coating
[NiCuNi] Nickel
product parameters »

125.56 zł with VAT / pcs + price for transport

102.08 zł net + 23% VAT / pcs

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Lifting power along with shape of neodymium magnets can be reviewed on our modular calculator.

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Technical - 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

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: 220405-2026
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It is the most popular solution for creating aesthetic, invisible door locks. The ability to flush the screw with the magnet surface allows for perfect closing without gaps. Model UMS 75x19x10.5x18 / 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. 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.
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. When selecting a magnet for a cabinet, remember that the air gap (e.g., bumpers, seals) weakens the grip.
The steel housing (cup/pot) acts as a magnetic shield, directing all power to the front of the holder. 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 rare earth magnets.

Benefits

Apart from their notable power, neodymium magnets have these key benefits:
  • They virtually do not lose power, because even after 10 years the decline in efficiency is only ~1% (in laboratory conditions),
  • Magnets very well defend themselves against loss of magnetization caused by external fields,
  • In other words, due to the shiny finish of gold, the element gains visual value,
  • Magnets have very high magnetic induction on the active area,
  • Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and can work (depending on the shape) even at a temperature of 230°C or more...
  • Considering the potential of flexible molding and customization to individualized needs, magnetic components can be created in a broad palette of geometric configurations, which increases their versatility,
  • Significant place in future technologies – they serve a role in HDD drives, motor assemblies, medical equipment, as well as other advanced devices.
  • Relatively small size with high pulling force – neodymium magnets offer high power in tiny dimensions, which allows their use in small systems

Weaknesses

Drawbacks and weaknesses of neodymium magnets and ways of using them
  • Brittleness is one of their disadvantages. Upon intense impact they can fracture. We advise keeping them in a special holder, which not only secures them against impacts but also increases their 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 resistant to moisture, in case of application outdoors
  • Limited ability of creating threads in the magnet and complicated shapes - recommended is casing - mounting mechanism.
  • Health risk resulting from small fragments of magnets are risky, in case of ingestion, which becomes key in the aspect of protecting the youngest. Furthermore, small components of these devices are able to be problematic in diagnostics medical in case of swallowing.
  • Due to complex production process, their price is higher than average,

Pull force analysis

Highest magnetic holding force – what it depends on?

Magnet power was determined for the most favorable conditions, assuming:
  • with the use of a yoke made of low-carbon steel, ensuring maximum field concentration
  • with a cross-section no less than 10 mm
  • with a surface perfectly flat
  • with total lack of distance (no impurities)
  • during pulling in a direction perpendicular to the mounting surface
  • at room temperature

Determinants of lifting force in real conditions

Real force is influenced by specific conditions, mainly (from most important):
  • Space between surfaces – even a fraction of a millimeter of distance (caused e.g. by varnish or dirt) diminishes the magnet efficiency, often by half at just 0.5 mm.
  • Direction of force – maximum parameter is reached only during perpendicular pulling. The shear force of the magnet along the plate is usually many times smaller (approx. 1/5 of the lifting capacity).
  • Substrate thickness – for full efficiency, the steel must be adequately massive. Paper-thin metal restricts the attraction force (the magnet "punches through" it).
  • Material type – ideal substrate is pure iron steel. Hardened steels may have worse magnetic properties.
  • Surface condition – smooth surfaces ensure maximum contact, which increases field saturation. Uneven metal reduce efficiency.
  • Temperature – temperature increase results in weakening of induction. Check the thermal limit for a given model.

Lifting capacity was assessed by applying a polished steel plate of suitable thickness (min. 20 mm), under perpendicular pulling force, in contrast under attempts to slide the magnet the holding force is lower. Additionally, even a minimal clearance between the magnet’s surface and the plate reduces the lifting capacity.

Safety rules for work with neodymium magnets
Handling rules

Handle magnets consciously. Their immense force can surprise even experienced users. Stay alert and do not underestimate their power.

Shattering risk

NdFeB magnets are sintered ceramics, which means they are very brittle. Collision of two magnets leads to them cracking into shards.

Medical interference

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

Do not give to children

Always store magnets out of reach of children. Ingestion danger is significant, and the consequences of magnets clamping inside the body are tragic.

Finger safety

Mind your fingers. Two large magnets will snap together immediately with a force of several hundred kilograms, crushing anything in their path. Exercise extreme caution!

GPS and phone interference

A strong magnetic field disrupts the operation of magnetometers in phones and GPS navigation. Maintain magnets near a smartphone to prevent damaging the sensors.

Allergy Warning

Studies show that the nickel plating (the usual finish) is a potent allergen. If your skin reacts to metals, avoid direct skin contact and choose coated magnets.

Data carriers

Equipment safety: Strong magnets can damage payment cards and sensitive devices (heart implants, medical aids, mechanical watches).

Do not overheat magnets

Monitor thermal conditions. Heating the magnet to high heat will ruin its magnetic structure and strength.

Combustion hazard

Combustion risk: Rare earth powder is highly flammable. Do not process magnets without safety gear as this may cause fire.

Security! Need more info? Read our article: Are neodymium magnets dangerous?