UMT 12x20 purple / N38 - board holder
board holder
Catalog no 230280
GTIN/EAN: 5906301814320
Diameter Ø
12 mm [±1 mm]
Height
20 mm [±1 mm]
Weight
3.5 g
Coating
[NiCuNi] Nickel
1.894 ZŁ with VAT / pcs + price for transport
1.540 ZŁ net + 23% VAT / pcs
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Product card - UMT 12x20 purple / N38 - board holder
Specification / characteristics - UMT 12x20 purple / N38 - board holder
| properties | values |
|---|---|
| Cat. no. | 230280 |
| GTIN/EAN | 5906301814320 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter Ø | 12 mm [±1 mm] |
| Height | 20 mm [±1 mm] |
| Weight | 3.5 g |
| 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 |
Elemental analysis
| 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 neodymium magnets.
Strengths
- They virtually do not lose strength, because even after 10 years the decline in efficiency is only ~1% (based on calculations),
- They feature excellent resistance to magnetic field loss as a result of opposing magnetic fields,
- Thanks to the glossy finish, the coating of nickel, gold-plated, or silver-plated gives an professional appearance,
- They are known for high magnetic induction at the operating surface, which improves attraction properties,
- Through (adequate) combination of ingredients, they can achieve high thermal resistance, allowing for operation at temperatures approaching 230°C and above...
- Possibility of precise shaping and adapting to complex conditions,
- Key role in advanced technology sectors – they are utilized in magnetic memories, brushless drives, medical equipment, as well as other advanced devices.
- Thanks to efficiency per cm³, small magnets offer high operating force, in miniature format,
Limitations
- Brittleness is one of their disadvantages. Upon strong impact they can fracture. We advise keeping them in a special holder, which not only secures them against impacts but also increases their durability
- Neodymium magnets lose force when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop 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 extremely resistant to heat
- They oxidize in a humid environment - during use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
- We recommend cover - magnetic mechanism, due to difficulties in creating threads inside the magnet and complicated forms.
- Health risk to health – tiny shards of magnets are risky, in case of ingestion, which gains importance in the aspect of protecting the youngest. It is also worth noting that small components of these magnets can disrupt the diagnostic process medical after entering the body.
- Due to expensive raw materials, their price is relatively high,
Holding force characteristics
Detachment force of the magnet in optimal conditions – what it depends on?
- on a plate made of structural steel, effectively closing the magnetic field
- with a thickness no less than 10 mm
- with an ground contact surface
- under conditions of no distance (metal-to-metal)
- under perpendicular force direction (90-degree angle)
- in temp. approx. 20°C
Key elements affecting lifting force
- Gap (betwixt the magnet and the metal), because even a tiny clearance (e.g. 0.5 mm) results in a drastic drop in force by up to 50% (this also applies to varnish, rust or debris).
- Direction of force – maximum parameter is obtained only during perpendicular pulling. The shear force of the magnet along the plate is typically many times lower (approx. 1/5 of the lifting capacity).
- Metal thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field penetrates through instead of converting into lifting capacity.
- Steel grade – ideal substrate is high-permeability steel. Hardened steels may generate lower lifting capacity.
- Base smoothness – the more even the plate, the better the adhesion and stronger the hold. Roughness creates an air distance.
- Operating temperature – NdFeB sinters have a negative temperature coefficient. When it is hot they lose power, and at low temperatures gain strength (up to a certain limit).
Lifting capacity was determined with the use of a steel plate with a smooth surface of suitable thickness (min. 20 mm), under perpendicular detachment force, in contrast under shearing force the load capacity is reduced by as much as 5 times. Moreover, even a small distance between the magnet’s surface and the plate reduces the load capacity.
Warnings
Crushing risk
Risk of injury: The attraction force is so immense that it can result in hematomas, crushing, and broken bones. Protective gloves are recommended.
Power loss in heat
Control the heat. Heating the magnet above 80 degrees Celsius will permanently weaken its magnetic structure and strength.
Eye protection
NdFeB magnets are ceramic materials, meaning they are prone to chipping. Collision of two magnets leads to them cracking into shards.
Magnetic media
Equipment safety: Neodymium magnets can ruin payment cards and sensitive devices (heart implants, hearing aids, timepieces).
Implant safety
Medical warning: Neodymium magnets can deactivate pacemakers and defibrillators. Do not approach if you have electronic implants.
Conscious usage
Use magnets consciously. Their huge power can surprise even professionals. Stay alert and respect their power.
Compass and GPS
Navigation devices and smartphones are extremely sensitive to magnetic fields. Close proximity with a strong magnet can ruin the internal compass in your phone.
Do not give to children
Adult use only. Small elements pose a choking risk, causing severe trauma. Store away from kids and pets.
Combustion hazard
Powder generated during grinding of magnets is flammable. Do not drill into magnets unless you are an expert.
Allergy Warning
Some people suffer from a hypersensitivity to nickel, which is the typical protective layer for NdFeB magnets. Extended handling can result in an allergic reaction. We recommend wear safety gloves.
Tabela kosztu i czasu dostawy
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