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UMS 25x10.5x5.5x8 / N38 - conical magnetic holder

conical magnetic holder

Catalog no 220328

GTIN/EAN: 5906301814184

5.00

Diameter Ø

25 mm [±1 mm]

cone dimension Ø

10.5x5.5 mm [±1 mm]

Height

8 mm [±1 mm]

Weight

21 g

Magnetization Direction

↑ axial

Load capacity

14.00 kg / 137.29 N

Coating

[NiCuNi] Nickel

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9.72 ZŁ with VAT / pcs + price for transport

7.90 ZŁ net + 23% VAT / pcs

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Technical of the product - UMS 25x10.5x5.5x8 / N38 - conical magnetic holder

Specification / characteristics - UMS 25x10.5x5.5x8 / N38 - conical magnetic holder

properties
properties values
Cat. no. 220328
GTIN/EAN 5906301814184
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 25 mm [±1 mm]
cone dimension Ø 10.5x5.5 mm [±1 mm]
Height 8 mm [±1 mm]
Weight 21 g
Magnetization Direction ↑ axial
Load capacity ~ ? 14.00 kg / 137.29 N
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±1 mm

Magnetic properties of material N38

Specification / characteristics UMS 25x10.5x5.5x8 / 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
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: 220328-2026
Measurement Calculator
Magnet pull force
Field Strength
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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. Model UMS 25x10.5x5.5x8 / 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. Avoid forceful tightening when you feel resistance. The screw head should not protrude above the magnet surface, but it cannot burst it either.
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. A set of magnet + plate is cheaper and holds just as strongly.
The declared capacity (e.g., 14.00 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.
The steel housing (cup/pot) acts as a magnetic shield, directing all power to the front of the holder. The housing absorbs impacts, preventing the magnet from crumbling and cracking. A bare ring has a dispersed field on both sides but is weaker in point holding.

Pros as well as cons of rare earth magnets.

Pros

Besides their stability, neodymium magnets are valued for these benefits:
  • They retain attractive force for around 10 years – the loss is just ~1% (in theory),
  • Neodymium magnets are distinguished by exceptionally resistant to loss of magnetic properties caused by external interference,
  • By using a lustrous layer of gold, the element has an modern look,
  • Neodymium magnets achieve maximum magnetic induction on a small area, which ensures high operational effectiveness,
  • Neodymium magnets are characterized by very high magnetic induction on the magnet surface and are able to act (depending on the shape) even at a temperature of 230°C or more...
  • Due to the option of accurate molding and customization to individualized requirements, NdFeB magnets can be created in a wide range of shapes and sizes, which makes them more universal,
  • Fundamental importance in modern industrial fields – they are used in computer drives, brushless drives, diagnostic systems, also multitasking production systems.
  • Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Weaknesses

Disadvantages of neodymium magnets:
  • To avoid cracks upon strong impacts, we recommend using special steel housings. Such a solution secures the magnet and simultaneously improves its durability.
  • Neodymium magnets lose power when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of strength (a factor is the shape and 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 corrode. Therefore while using outdoors, we suggest using waterproof magnets made of rubber, plastic or other material resistant to moisture
  • Limited possibility of producing nuts in the magnet and complex forms - preferred is cover - magnetic holder.
  • Possible danger related to microscopic parts of magnets can be dangerous, when accidentally swallowed, which becomes key in the context of child safety. It is also worth noting that tiny parts of these products are able to complicate diagnosis medical after entering the body.
  • With large orders the cost of neodymium magnets can be a barrier,

Holding force characteristics

Maximum magnetic pulling force – what it depends on?

Information about lifting capacity was defined for optimal configuration, taking into account:
  • with the application of a sheet made of low-carbon steel, ensuring full magnetic saturation
  • with a cross-section no less than 10 mm
  • with an ideally smooth contact surface
  • under conditions of no distance (surface-to-surface)
  • under vertical force direction (90-degree angle)
  • at room temperature

Magnet lifting force in use – key factors

It is worth knowing that the magnet holding may be lower subject to elements below, in order of importance:
  • Clearance – the presence of foreign body (rust, tape, air) interrupts the magnetic circuit, which lowers capacity steeply (even by 50% at 0.5 mm).
  • Loading method – declared lifting capacity refers to detachment vertically. When applying parallel force, the magnet exhibits much less (often approx. 20-30% of maximum force).
  • Base massiveness – too thin steel causes magnetic saturation, causing part of the power to be wasted into the air.
  • Plate material – mild steel attracts best. Alloy steels reduce magnetic properties and holding force.
  • Surface quality – the smoother and more polished the surface, the better the adhesion and higher the lifting capacity. Roughness creates an air distance.
  • Thermal conditions – NdFeB sinters have a negative temperature coefficient. When it is hot they lose power, and in frost they can be stronger (up to a certain limit).

Lifting capacity was assessed by applying a polished steel plate of optimal thickness (min. 20 mm), under perpendicular pulling force, in contrast under parallel forces the lifting capacity is smaller. Additionally, even a small distance between the magnet’s surface and the plate reduces the load capacity.

H&S for magnets
Danger to pacemakers

For implant holders: Strong magnetic fields affect electronics. Maintain minimum 30 cm distance or ask another person to work with the magnets.

Respect the power

Handle magnets with awareness. Their huge power can shock even professionals. Be vigilant and respect their force.

Thermal limits

Regular neodymium magnets (N-type) undergo demagnetization when the temperature surpasses 80°C. The loss of strength is permanent.

Finger safety

Risk of injury: The attraction force is so immense that it can result in hematomas, pinching, and broken bones. Use thick gloves.

This is not a toy

Neodymium magnets are not toys. Accidental ingestion of a few magnets may result in them attracting across intestines, which constitutes a direct threat to life and requires urgent medical intervention.

Magnets are brittle

Watch out for shards. Magnets can fracture upon violent connection, ejecting shards into the air. Wear goggles.

Phone sensors

A strong magnetic field negatively affects the operation of magnetometers in smartphones and GPS navigation. Keep magnets near a smartphone to prevent damaging the sensors.

Flammability

Drilling and cutting of NdFeB material carries a risk of fire risk. Magnetic powder reacts violently with oxygen and is difficult to extinguish.

Nickel coating and allergies

Some people have a sensitization to Ni, which is the common plating for NdFeB magnets. Frequent touching may cause dermatitis. We recommend wear protective gloves.

Cards and drives

Powerful magnetic fields can erase data on credit cards, HDDs, and storage devices. Stay away of at least 10 cm.

Caution! Want to know more? Read our article: Are neodymium magnets dangerous?