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HH 20x7.2 [M4] / N38 - through hole magnetic holder
through hole magnetic holder
Catalog no 370481
GTIN/EAN: 5906301814917
Diameter Ø
20 mm [±1 mm]
Height
7.2 mm [±1 mm]
Weight
13.2 g
Magnetization Direction
↑ axial
Load capacity
8.00 kg / 78.45 N
Coating
[NiCuNi] Nickel
6.40 ZŁ with VAT / pcs + price for transport
5.20 ZŁ net + 23% VAT / pcs
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Technical details - HH 20x7.2 [M4] / N38 - through hole magnetic holder
Specification / characteristics - HH 20x7.2 [M4] / N38 - through hole magnetic holder
| properties | values |
|---|---|
| Cat. no. | 370481 |
| GTIN/EAN | 5906301814917 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter Ø | 20 mm [±1 mm] |
| Height | 7.2 mm [±1 mm] |
| Weight | 13.2 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 8.00 kg / 78.45 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% |
Environmental data
| 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 Nd2Fe14B magnets.
Strengths
- Their magnetic field is maintained, and after approximately ten years it drops only by ~1% (according to research),
- They are noted for resistance to demagnetization induced by presence of other magnetic fields,
- In other words, due to the metallic finish of silver, the element becomes visually attractive,
- They feature high magnetic induction at the operating surface, making them more effective,
- Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
- Possibility of precise machining and adjusting to individual requirements,
- Fundamental importance in innovative solutions – they are utilized in data components, motor assemblies, advanced medical instruments, and other advanced devices.
- Compactness – despite small sizes they generate large force, making them ideal for precision applications
Disadvantages
- To avoid cracks under impact, we recommend using special steel housings. Such a solution secures the magnet and simultaneously increases its durability.
- Neodymium magnets lose power when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of power (a factor is the shape as well as 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
- Due to the susceptibility of magnets to corrosion in a humid environment, we recommend using waterproof magnets made of rubber, plastic or other material immune to moisture, when using outdoors
- We recommend a housing - magnetic holder, due to difficulties in creating threads inside the magnet and complicated forms.
- Health risk resulting from small fragments of magnets pose a threat, in case of ingestion, which is particularly important in the context of child safety. Additionally, tiny parts of these devices are able to be problematic in diagnostics medical when they are in the body.
- Due to expensive raw materials, their price is higher than average,
Holding force characteristics
Maximum lifting capacity of the magnet – what contributes to it?
- using a plate made of high-permeability steel, functioning as a ideal flux conductor
- with a thickness minimum 10 mm
- characterized by lack of roughness
- without any air gap between the magnet and steel
- under vertical force direction (90-degree angle)
- in neutral thermal conditions
Practical lifting capacity: influencing factors
- Space between magnet and steel – every millimeter of separation (caused e.g. by varnish or dirt) drastically reduces the pulling force, often by half at just 0.5 mm.
- Loading method – catalog parameter refers to pulling vertically. When slipping, the magnet holds significantly lower power (often approx. 20-30% of nominal force).
- Substrate thickness – for full efficiency, the steel must be sufficiently thick. Paper-thin metal restricts the attraction force (the magnet "punches through" it).
- Chemical composition of the base – low-carbon steel attracts best. Higher carbon content lower magnetic permeability and lifting capacity.
- Smoothness – full contact is possible only on smooth steel. Rough texture create air cushions, reducing force.
- Heat – NdFeB sinters have a sensitivity to temperature. When it is hot they are weaker, and at low temperatures they can be stronger (up to a certain limit).
Holding force was measured on the plate surface of 20 mm thickness, when a perpendicular force was applied, in contrast under shearing force the holding force is lower. Additionally, even a minimal clearance between the magnet’s surface and the plate decreases the lifting capacity.
Warnings
Fire risk
Machining of NdFeB material poses a fire risk. Magnetic powder oxidizes rapidly with oxygen and is hard to extinguish.
Data carriers
Avoid bringing magnets near a purse, laptop, or screen. The magnetic field can irreversibly ruin these devices and erase data from cards.
Handling guide
Before use, check safety instructions. Uncontrolled attraction can break the magnet or hurt your hand. Be predictive.
Shattering risk
Neodymium magnets are sintered ceramics, which means they are very brittle. Collision of two magnets will cause them cracking into small pieces.
Nickel coating and allergies
Studies show that nickel (standard magnet coating) is a potent allergen. If you have an allergy, refrain from direct skin contact and choose encased magnets.
Medical implants
For implant holders: Strong magnetic fields affect medical devices. Keep minimum 30 cm distance or ask another person to work with the magnets.
Phone sensors
Be aware: rare earth magnets produce a field that confuses precision electronics. Keep a separation from your phone, device, and GPS.
Heat warning
Standard neodymium magnets (N-type) undergo demagnetization when the temperature goes above 80°C. This process is irreversible.
Bodily injuries
Mind your fingers. Two large magnets will snap together immediately with a force of massive weight, destroying everything in their path. Exercise extreme caution!
No play value
Strictly keep magnets away from children. Ingestion danger is high, and the consequences of magnets clamping inside the body are fatal.
Tabela kosztu i czasu dostawy
Płatność przed wysyłką:
GLS kurier
Przesyłka będzie u Ciebie za 2-3 dni
14.99 ZŁ
InPost Paczkomaty 24/7
Przesyłka będzie u Ciebie za 1-2 dni
12.30 ZŁ
Płatność przy odbiorze (pobranie):
GLS kurier
Przesyłka będzie u Ciebie za 1-2 dni
23.00 ZŁ
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