UMC 20x6/3x7 / N38 - cylindrical magnetic holder
cylindrical magnetic holder
Catalog no 320407
GTIN/EAN: 5906301814634
Diameter
20 mm [±1 mm]
internal diameter Ø
6/3 mm [±1 mm]
Height
7 mm [±1 mm]
Weight
12 g
Magnetization Direction
↑ axial
Load capacity
6.00 kg / 58.84 N
Coating
[NiCuNi] Nickel
6.99 ZŁ with VAT / pcs + price for transport
5.68 ZŁ net + 23% VAT / pcs
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Detailed specification - UMC 20x6/3x7 / N38 - cylindrical magnetic holder
Specification / characteristics - UMC 20x6/3x7 / N38 - cylindrical magnetic holder
| properties | values |
|---|---|
| Cat. no. | 320407 |
| GTIN/EAN | 5906301814634 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter | 20 mm [±1 mm] |
| internal diameter Ø | 6/3 mm [±1 mm] |
| Height | 7 mm [±1 mm] |
| Weight | 12 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 6.00 kg / 58.84 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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Advantages as well as disadvantages of rare earth magnets.
Advantages
- They virtually do not lose strength, because even after ten years the performance loss is only ~1% (in laboratory conditions),
- They possess excellent resistance to magnetism drop due to opposing magnetic fields,
- A magnet with a smooth gold surface is more attractive,
- Magnets exhibit maximum magnetic induction on the outer layer,
- Due to their durability and thermal resistance, neodymium magnets can operate (depending on the form) even at high temperatures reaching 230°C or more...
- Thanks to the potential of accurate molding and customization to unique solutions, magnetic components can be created in a wide range of forms and dimensions, which increases their versatility,
- Universal use in advanced technology sectors – they are commonly used in data components, motor assemblies, diagnostic systems, as well as industrial machines.
- Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications
Cons
- They are prone to damage upon heavy impacts. To avoid cracks, it is worth protecting magnets using a steel holder. Such protection not only shields the magnet but also improves its resistance to damage
- 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
- They rust in a humid environment. For use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
- Due to limitations in realizing nuts and complicated forms in magnets, we recommend using cover - magnetic mechanism.
- Possible danger related to microscopic parts of magnets are risky, when accidentally swallowed, which is particularly important in the context of child health protection. Furthermore, tiny parts of these devices are able to disrupt the diagnostic process medical in case of swallowing.
- Due to neodymium price, their price is relatively high,
Holding force characteristics
Maximum lifting capacity of the magnet – what affects it?
- with the contact of a yoke made of low-carbon steel, guaranteeing full magnetic saturation
- with a cross-section no less than 10 mm
- with a surface cleaned and smooth
- under conditions of no distance (surface-to-surface)
- during pulling in a direction vertical to the plane
- at standard ambient temperature
Practical lifting capacity: influencing factors
- Space between surfaces – every millimeter of separation (caused e.g. by veneer or unevenness) diminishes the magnet efficiency, often by half at just 0.5 mm.
- Load vector – highest force is available only during pulling at a 90° angle. The resistance to sliding of the magnet along the plate is usually many times smaller (approx. 1/5 of the lifting capacity).
- Wall thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field passes through the material instead of converting into lifting capacity.
- Steel type – mild steel gives the best results. Alloy admixtures decrease magnetic permeability and holding force.
- Plate texture – smooth surfaces ensure maximum contact, which improves field saturation. Uneven metal reduce efficiency.
- Thermal conditions – NdFeB sinters have a sensitivity to temperature. At higher temperatures they lose power, and at low temperatures gain strength (up to a certain limit).
Lifting capacity testing was carried out on plates with a smooth surface of suitable thickness, under perpendicular forces, in contrast under shearing force the load capacity is reduced by as much as 75%. In addition, even a minimal clearance between the magnet’s surface and the plate decreases the lifting capacity.
Safe handling of NdFeB magnets
Fragile material
Despite metallic appearance, the material is delicate and not impact-resistant. Do not hit, as the magnet may crumble into sharp, dangerous pieces.
Implant safety
For implant holders: Strong magnetic fields disrupt medical devices. Maintain at least 30 cm distance or ask another person to work with the magnets.
Cards and drives
Data protection: Neodymium magnets can ruin payment cards and sensitive devices (heart implants, hearing aids, mechanical watches).
Keep away from electronics
Navigation devices and mobile phones are highly susceptible to magnetic fields. Close proximity with a strong magnet can decalibrate the sensors in your phone.
Heat warning
Keep cool. Neodymium magnets are susceptible to temperature. If you require resistance above 80°C, look for HT versions (H, SH, UH).
Allergic reactions
Studies show that the nickel plating (standard magnet coating) is a strong allergen. If you have an allergy, avoid touching magnets with bare hands and select encased magnets.
Dust explosion hazard
Powder generated during machining of magnets is self-igniting. Avoid drilling into magnets without proper cooling and knowledge.
Respect the power
Use magnets with awareness. Their immense force can shock even professionals. Plan your moves and respect their power.
Adults only
NdFeB magnets are not suitable for play. Eating several magnets can lead to them pinching intestinal walls, which constitutes a severe health hazard and necessitates immediate surgery.
Finger safety
Pinching hazard: The attraction force is so great that it can cause hematomas, pinching, and broken bones. Protective gloves are recommended.
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23.00 ZŁ
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