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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 details - 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% |
Environmental data
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
Check out also proposals
Pros and cons of rare earth magnets.
Benefits
- They do not lose power, even during around 10 years – the drop in strength is only ~1% (according to tests),
- They are resistant to demagnetization induced by presence of other magnetic fields,
- A magnet with a metallic silver surface looks better,
- Neodymium magnets generate maximum magnetic induction on a their surface, which ensures high operational effectiveness,
- Due to their durability and thermal resistance, neodymium magnets can operate (depending on the shape) even at high temperatures reaching 230°C or more...
- Considering the possibility of precise forming and customization to specialized solutions, neodymium magnets can be created in a wide range of forms and dimensions, which expands the range of possible applications,
- Fundamental importance in future technologies – they find application in HDD drives, electric drive systems, medical equipment, also modern systems.
- Compactness – despite small sizes they provide effective action, making them ideal for precision applications
Limitations
- Susceptibility to cracking is one of their disadvantages. Upon intense impact they can fracture. We recommend keeping them in a strong case, which not only secures them against impacts but also increases their durability
- Neodymium magnets lose their power under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 230°C
- Magnets exposed to a humid environment can rust. Therefore when using outdoors, we advise using waterproof magnets made of rubber, plastic or other material resistant to moisture
- We recommend a housing - magnetic holder, due to difficulties in creating threads inside the magnet and complicated shapes.
- Potential hazard resulting from small fragments of magnets can be dangerous, if swallowed, which is particularly important in the context of child safety. It is also worth noting that small components of these devices can complicate diagnosis medical in case of swallowing.
- High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which can limit application in large quantities
Lifting parameters
Detachment force of the magnet in optimal conditions – what affects it?
- using a sheet made of mild steel, serving as a ideal flux conductor
- possessing a massiveness of minimum 10 mm to avoid saturation
- with an ideally smooth contact surface
- with total lack of distance (without coatings)
- during pulling in a direction vertical to the plane
- at ambient temperature room level
Practical lifting capacity: influencing factors
- Gap between magnet and steel – every millimeter of distance (caused e.g. by veneer or unevenness) drastically reduces the magnet efficiency, often by half at just 0.5 mm.
- Force direction – catalog parameter refers to detachment vertically. When slipping, the magnet holds much less (typically approx. 20-30% of nominal force).
- Element thickness – to utilize 100% power, the steel must be sufficiently thick. Paper-thin metal restricts the attraction force (the magnet "punches through" it).
- Metal type – different alloys reacts the same. Alloy additives worsen the attraction effect.
- Surface finish – full contact is possible only on polished steel. Rough texture create air cushions, reducing force.
- Thermal factor – high temperature weakens magnetic field. Exceeding the limit temperature can permanently damage the magnet.
Lifting capacity was assessed by applying a smooth steel plate of optimal thickness (min. 20 mm), under perpendicular pulling force, however under parallel forces the lifting capacity is smaller. Moreover, even a minimal clearance between the magnet and the plate decreases the lifting capacity.
Safety rules for work with NdFeB magnets
Do not overheat magnets
Monitor thermal conditions. Exposing the magnet above 80 degrees Celsius will ruin its properties and pulling force.
Adults only
Adult use only. Small elements pose a choking risk, causing intestinal necrosis. Store out of reach of kids and pets.
Magnetic interference
A strong magnetic field disrupts the operation of magnetometers in phones and navigation systems. Do not bring magnets near a device to prevent breaking the sensors.
Skin irritation risks
Medical facts indicate that the nickel plating (the usual finish) is a strong allergen. If you have an allergy, prevent direct skin contact and opt for encased magnets.
Combustion hazard
Powder produced during machining of magnets is flammable. Do not drill into magnets unless you are an expert.
Pinching danger
Big blocks can crush fingers in a fraction of a second. Under no circumstances place your hand betwixt two attracting surfaces.
Health Danger
Life threat: Strong magnets can deactivate pacemakers and defibrillators. Stay away if you have medical devices.
Immense force
Before use, check safety instructions. Uncontrolled attraction can destroy the magnet or injure your hand. Be predictive.
Electronic devices
Very strong magnetic fields can destroy records on payment cards, hard drives, and other magnetic media. Keep a distance of min. 10 cm.
Shattering risk
Despite metallic appearance, neodymium is brittle and cannot withstand shocks. Do not hit, as the magnet may shatter into sharp, dangerous pieces.
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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