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![HH 25x7.7 [M5] / N38 - through hole magnetic holder](https://cdn3.dhit.pl/graphics/products/hh-25x7.7-m5-pov.jpg)
HH 25x7.7 [M5] / N38 - through hole magnetic holder
through hole magnetic holder
Catalog no 370482
GTIN/EAN: 5906301814924
Diameter Ø
25 mm [±1 mm]
Height
7.7 mm [±1 mm]
Weight
23.8 g
Magnetization Direction
↑ axial
Load capacity
17.00 kg / 166.71 N
Coating
[NiCuNi] Nickel
11.44 ZŁ with VAT / pcs + price for transport
9.30 ZŁ net + 23% VAT / pcs
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Technical data - HH 25x7.7 [M5] / N38 - through hole magnetic holder
Specification / characteristics - HH 25x7.7 [M5] / N38 - through hole magnetic holder
| properties | values |
|---|---|
| Cat. no. | 370482 |
| GTIN/EAN | 5906301814924 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter Ø | 25 mm [±1 mm] |
| Height | 7.7 mm [±1 mm] |
| Weight | 23.8 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 17.00 kg / 166.71 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 |
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% |
Sustainability
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
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Pros as well as cons of rare earth magnets.
Pros
- They virtually do not lose strength, because even after ten years the performance loss is only ~1% (based on calculations),
- They have excellent resistance to magnetic field loss due to external magnetic sources,
- By applying a shiny coating of silver, the element acquires an elegant look,
- They show high magnetic induction at the operating surface, which increases their power,
- 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...
- Thanks to modularity in designing and the capacity to adapt to unusual requirements,
- Key role in modern industrial fields – they serve a role in computer drives, drive modules, medical equipment, as well as multitasking production systems.
- Compactness – despite small sizes they generate large force, making them ideal for precision applications
Cons
- They are prone to damage upon too strong impacts. To avoid cracks, it is worth securing magnets using a steel holder. Such protection not only protects the magnet but also improves its resistance to damage
- NdFeB magnets lose strength when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of strength (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
- They oxidize in a humid environment. For use outdoors we advise using waterproof magnets e.g. in rubber, plastic
- Limited ability of producing threads in the magnet and complicated forms - recommended is casing - magnetic holder.
- Health risk to health – tiny shards of magnets pose a threat, if swallowed, which gains importance in the aspect of protecting the youngest. Furthermore, small elements of these devices are able to disrupt the diagnostic process medical after entering the body.
- Due to expensive raw materials, their price is relatively high,
Lifting parameters
Detachment force of the magnet in optimal conditions – what it depends on?
- on a block made of structural steel, optimally conducting the magnetic field
- whose transverse dimension is min. 10 mm
- with an ideally smooth touching surface
- with total lack of distance (no coatings)
- during detachment in a direction perpendicular to the mounting surface
- at conditions approx. 20°C
Practical lifting capacity: influencing factors
- Distance (between the magnet and the plate), since even a tiny distance (e.g. 0.5 mm) leads to a reduction in force by up to 50% (this also applies to varnish, corrosion or dirt).
- Loading method – catalog parameter refers to detachment vertically. When applying parallel force, the magnet holds much less (often approx. 20-30% of maximum force).
- Metal thickness – thin material does not allow full use of the magnet. Magnetic flux penetrates through instead of generating force.
- Chemical composition of the base – mild steel gives the best results. Higher carbon content lower magnetic permeability and lifting capacity.
- Smoothness – ideal contact is obtained only on polished steel. Rough texture reduce the real contact area, reducing force.
- Temperature – temperature increase results in weakening of induction. It is worth remembering the thermal limit for a given model.
Lifting capacity was measured using a steel plate with a smooth surface of suitable thickness (min. 20 mm), under perpendicular pulling force, whereas under parallel forces the load capacity is reduced by as much as 75%. Moreover, even a small distance between the magnet and the plate decreases the lifting capacity.
Precautions when working with NdFeB magnets
Keep away from computers
Intense magnetic fields can destroy records on credit cards, HDDs, and storage devices. Maintain a gap of min. 10 cm.
Sensitization to coating
Studies show that the nickel plating (the usual finish) is a common allergen. If you have an allergy, avoid touching magnets with bare hands or select encased magnets.
Hand protection
Watch your fingers. Two large magnets will snap together immediately with a force of several hundred kilograms, destroying everything in their path. Be careful!
Conscious usage
Before starting, check safety instructions. Uncontrolled attraction can destroy the magnet or injure your hand. Be predictive.
Health Danger
Patients with a pacemaker should keep an large gap from magnets. The magnetic field can stop the functioning of the implant.
Power loss in heat
Keep cool. NdFeB magnets are sensitive to heat. If you need operation above 80°C, look for special high-temperature series (H, SH, UH).
Combustion hazard
Powder created during machining of magnets is self-igniting. Do not drill into magnets without proper cooling and knowledge.
Threat to navigation
A powerful magnetic field disrupts the functioning of compasses in smartphones and navigation systems. Keep magnets close to a smartphone to prevent damaging the sensors.
Protective goggles
Neodymium magnets are sintered ceramics, which means they are prone to chipping. Impact of two magnets leads to them breaking into shards.
Adults only
NdFeB magnets are not suitable for play. Swallowing multiple magnets may result in them attracting across intestines, which constitutes a direct threat to life and requires immediate surgery.
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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