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UMC 25x6/4x8 / N38 - cylindrical magnetic holder

cylindrical magnetic holder

Catalog no 320408

GTIN/EAN: 5906301814641

Diameter

25 mm [±1 mm]

internal diameter Ø

6/4 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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11.70 ZŁ with VAT / pcs + price for transport

9.51 ZŁ net + 23% VAT / pcs

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Carbon Footprint – environmental impact GPSR Regulation – product safety
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Give us a call +48 22 499 98 98 alternatively let us know using request form the contact form page.
Weight along with structure of a neodymium magnet can be calculated on our magnetic mass calculator.

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Physical properties - UMC 25x6/4x8 / N38 - cylindrical magnetic holder

Specification / characteristics - UMC 25x6/4x8 / N38 - cylindrical magnetic holder

properties
properties values
Cat. no. 320408
GTIN/EAN 5906301814641
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 25 mm [±1 mm]
internal diameter Ø 6/4 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 UMC 25x6/4x8 / N38 - cylindrical 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: 320408-2026
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Pulling force
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Cylindrical holders (Type B) distinguish themselves with a large body height, which allows for deep mounting. Thanks to side shielding, they do not "catch" the walls of the mounting hole, which facilitates installation.
Mounting is done by screwing with a bolt from the back of the device or machine. It is a precise, durable solution enabling depth adjustment.
The thick, steel or brass housing (sleeve) effectively screens the magnetic field on the sides of the holder. It enables precise point action without side interference.
The steel housing provides excellent mechanical protection for the brittle magnet against impacts. Thanks to the solid build, the holder withstands repeated impacts and shocks during work cycles.
Dimensions may vary slightly, so they are not always H7 fitted elements without machining. It is an industrial product, not a precise machine element, although the execution is careful.

Pros and cons of neodymium magnets.

Benefits

Besides their stability, neodymium magnets are valued for these benefits:
  • They do not lose power, even after around 10 years – the drop in lifting capacity is only ~1% (according to tests),
  • They do not lose their magnetic properties even under external field action,
  • By covering with a decorative layer of gold, the element acquires an professional look,
  • The surface of neodymium magnets generates a maximum magnetic field – this is a key feature,
  • Due to their durability and thermal resistance, neodymium magnets can operate (depending on the shape) even at high temperatures reaching 230°C or more...
  • Thanks to modularity in forming and the ability to customize to unusual requirements,
  • Fundamental importance in high-tech industry – they are used in magnetic memories, electromotive mechanisms, advanced medical instruments, also modern systems.
  • Relatively small size with high pulling force – neodymium magnets offer high power in tiny dimensions, which enables their usage in small systems

Disadvantages

Problematic aspects of neodymium magnets and ways of using them
  • Susceptibility to cracking is one of their disadvantages. Upon strong impact they can break. We recommend keeping them in a steel housing, which not only secures them against impacts but also increases their durability
  • When exposed to high temperature, neodymium magnets experience a drop in strength. Often, when the temperature exceeds 80°C, their strength 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
  • Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material resistant to moisture, in case of application outdoors
  • We recommend cover - magnetic mount, due to difficulties in realizing nuts inside the magnet and complicated shapes.
  • Possible danger resulting from small fragments of magnets pose a threat, if swallowed, which gains importance in the context of child health protection. Additionally, tiny parts of these devices can complicate diagnosis medical when they are in the body.
  • With budget limitations the cost of neodymium magnets is a challenge,

Holding force characteristics

Highest magnetic holding force – what contributes to it?

Magnet power is the result of a measurement for the most favorable conditions, assuming:
  • using a sheet made of low-carbon steel, acting as a circuit closing element
  • possessing a massiveness of min. 10 mm to avoid saturation
  • with a plane perfectly flat
  • without the slightest clearance between the magnet and steel
  • during pulling in a direction perpendicular to the plane
  • at ambient temperature approx. 20 degrees Celsius

Magnet lifting force in use – key factors

Bear in mind that the application force may be lower subject to elements below, in order of importance:
  • Gap (between the magnet and the metal), as even a tiny distance (e.g. 0.5 mm) can cause a reduction in force by up to 50% (this also applies to varnish, corrosion or debris).
  • Force direction – declared lifting capacity refers to pulling vertically. When attempting to slide, the magnet holds significantly lower power (often approx. 20-30% of nominal force).
  • Base massiveness – too thin sheet causes magnetic saturation, causing part of the power to be escaped to the other side.
  • Steel grade – the best choice is pure iron steel. Cast iron may attract less.
  • Smoothness – ideal contact is obtained only on smooth steel. Any scratches and bumps reduce the real contact area, reducing force.
  • Temperature influence – high temperature weakens magnetic field. Too high temperature can permanently damage the magnet.

Lifting capacity was measured using a polished steel plate of suitable thickness (min. 20 mm), under perpendicular detachment force, however under parallel forces the holding force is lower. Moreover, even a slight gap between the magnet and the plate lowers the load capacity.

Warnings
Electronic devices

Very strong magnetic fields can erase data on payment cards, HDDs, and other magnetic media. Keep a distance of at least 10 cm.

Risk of cracking

NdFeB magnets are ceramic materials, meaning they are prone to chipping. Collision of two magnets leads to them breaking into shards.

Crushing risk

Big blocks can break fingers instantly. Do not put your hand between two strong magnets.

Maximum temperature

Monitor thermal conditions. Exposing the magnet above 80 degrees Celsius will permanently weaken its properties and strength.

No play value

Always keep magnets out of reach of children. Choking hazard is significant, and the effects of magnets clamping inside the body are fatal.

Nickel allergy

Studies show that the nickel plating (the usual finish) is a common allergen. If your skin reacts to metals, prevent touching magnets with bare hands and choose encased magnets.

Danger to pacemakers

For implant holders: Strong magnetic fields affect medical devices. Maintain minimum 30 cm distance or ask another person to handle the magnets.

Precision electronics

GPS units and mobile phones are highly sensitive to magnetic fields. Direct contact with a powerful NdFeB magnet can permanently damage the sensors in your phone.

Mechanical processing

Combustion risk: Rare earth powder is highly flammable. Do not process magnets without safety gear as this risks ignition.

Respect the power

Before starting, read the rules. Sudden snapping can destroy the magnet or hurt your hand. Be predictive.

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