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
11.70 ZŁ with VAT / pcs + price for transport
9.51 ZŁ net + 23% VAT / pcs
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Technical - UMC 25x6/4x8 / N38 - cylindrical magnetic holder
Specification / characteristics - UMC 25x6/4x8 / N38 - cylindrical magnetic holder
| properties | values |
|---|---|
| Cat. no. | 320408 |
| GTIN/EAN | 5906301814641 |
| Production/Distribution | Dhit sp. z o.o. |
| 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
| 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
| 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 |
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 |
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Strengths as well as weaknesses of rare earth magnets.
Benefits
- They do not lose strength, even over nearly 10 years – the decrease in strength is only ~1% (based on measurements),
- Magnets effectively defend themselves against demagnetization caused by ambient magnetic noise,
- The use of an aesthetic coating of noble metals (nickel, gold, silver) causes the element to present itself better,
- Magnetic induction on the top side of the magnet turns out to be very high,
- Through (adequate) combination of ingredients, they can achieve high thermal resistance, allowing for action at temperatures approaching 230°C and above...
- Thanks to flexibility in constructing and the capacity to modify to unusual requirements,
- Universal use in advanced technology sectors – they serve a role in computer drives, motor assemblies, medical devices, also technologically advanced constructions.
- Thanks to their power density, small magnets offer high operating force, in miniature format,
Weaknesses
- To avoid cracks under impact, we recommend using special steel housings. Such a solution protects the magnet and simultaneously improves its durability.
- NdFeB magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of power (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 advise using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
- Limited possibility of producing nuts in the magnet and complex shapes - preferred is cover - mounting mechanism.
- Possible danger to health – tiny shards of magnets are risky, in case of ingestion, which becomes key in the context of child health protection. Additionally, small components of these magnets are able to disrupt the diagnostic process medical in case of swallowing.
- Due to expensive raw materials, their price is relatively high,
Lifting parameters
Maximum holding power of the magnet – what contributes to it?
- on a block made of mild steel, effectively closing the magnetic field
- with a thickness of at least 10 mm
- characterized by even structure
- with direct contact (no coatings)
- for force applied at a right angle (pull-off, not shear)
- at ambient temperature approx. 20 degrees Celsius
Impact of factors on magnetic holding capacity in practice
- Clearance – the presence of foreign body (rust, tape, gap) interrupts the magnetic circuit, which reduces capacity rapidly (even by 50% at 0.5 mm).
- Loading method – declared lifting capacity refers to detachment vertically. When slipping, the magnet exhibits significantly lower power (typically approx. 20-30% of nominal force).
- Metal thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field penetrates through instead of converting into lifting capacity.
- Metal type – not every steel attracts identically. Alloy additives worsen the interaction with the magnet.
- Base smoothness – the smoother and more polished the plate, the larger the contact zone and stronger the hold. Roughness creates an air distance.
- Temperature influence – high temperature reduces magnetic field. Exceeding the limit temperature can permanently demagnetize the magnet.
Lifting capacity testing was conducted on a smooth plate of optimal thickness, under a perpendicular pulling force, however under shearing force the lifting capacity is smaller. In addition, even a minimal clearance between the magnet’s surface and the plate decreases the lifting capacity.
H&S for magnets
Pacemakers
Health Alert: Neodymium magnets can deactivate heart devices and defibrillators. Do not approach if you have medical devices.
Permanent damage
Regular neodymium magnets (grade N) undergo demagnetization when the temperature goes above 80°C. This process is irreversible.
Data carriers
Intense magnetic fields can destroy records on payment cards, hard drives, and storage devices. Maintain a gap of at least 10 cm.
Danger to the youngest
Only for adults. Small elements can be swallowed, leading to intestinal necrosis. Store away from children and animals.
Threat to navigation
Be aware: neodymium magnets generate a field that disrupts precision electronics. Keep a safe distance from your mobile, tablet, and GPS.
Magnet fragility
Despite metallic appearance, neodymium is brittle and not impact-resistant. Avoid impacts, as the magnet may shatter into sharp, dangerous pieces.
Crushing force
Big blocks can break fingers instantly. Never place your hand betwixt two strong magnets.
Immense force
Use magnets with awareness. Their powerful strength can shock even experienced users. Plan your moves and do not underestimate their force.
Flammability
Combustion risk: Rare earth powder is explosive. Avoid machining magnets without safety gear as this may cause fire.
Allergy Warning
Nickel alert: The nickel-copper-nickel coating consists of nickel. If an allergic reaction occurs, immediately stop working with magnets and wear gloves.
Tabela kosztu i czasu dostawy
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Płatność przy odbiorze (pobranie):
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