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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
bulk discounts:
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Physical properties - 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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Strengths and weaknesses of Nd2Fe14B magnets.
Benefits
- They do not lose power, even after nearly 10 years – the reduction in power is only ~1% (based on measurements),
- Neodymium magnets are extremely resistant to demagnetization caused by external magnetic fields,
- A magnet with a shiny nickel surface has an effective appearance,
- Magnets exhibit huge magnetic induction on the working surface,
- Neodymium magnets are characterized by very high magnetic induction on the magnet surface and are able to act (depending on the shape) even at a temperature of 230°C or more...
- Thanks to the option of precise molding and adaptation to specialized projects, NdFeB magnets can be manufactured in a broad palette of geometric configurations, which expands the range of possible applications,
- Versatile presence in modern industrial fields – they are commonly used in HDD drives, motor assemblies, medical devices, and multitasking production systems.
- Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in small dimensions, which makes them useful in miniature devices
Limitations
- Brittleness is one of their disadvantages. Upon intense impact they can break. We advise keeping them in a special holder, which not only secures them against impacts but also raises their durability
- We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 230°C.
- Magnets exposed to a humid environment can rust. Therefore when using outdoors, we suggest using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
- Due to limitations in creating threads and complicated shapes in magnets, we recommend using a housing - magnetic holder.
- Possible danger related to microscopic parts of magnets pose a threat, in case of ingestion, which is particularly important in the aspect of protecting the youngest. It is also worth noting that small components of these products can be problematic in diagnostics medical after entering the body.
- Due to expensive raw materials, their price is relatively high,
Holding force characteristics
Optimal lifting capacity of a neodymium magnet – what affects it?
- using a plate made of mild steel, serving as a circuit closing element
- possessing a massiveness of minimum 10 mm to ensure full flux closure
- characterized by even structure
- under conditions of no distance (metal-to-metal)
- for force acting at a right angle (in the magnet axis)
- in neutral thermal conditions
Determinants of practical lifting force of a magnet
- Distance – existence of any layer (rust, tape, gap) acts as an insulator, which reduces capacity rapidly (even by 50% at 0.5 mm).
- Loading method – catalog parameter refers to detachment vertically. When attempting to slide, the magnet exhibits significantly lower power (typically approx. 20-30% of maximum force).
- Wall thickness – the thinner the sheet, the weaker the hold. Magnetic flux passes through the material instead of converting into lifting capacity.
- Steel type – mild steel attracts best. Alloy steels lower magnetic properties and lifting capacity.
- Plate texture – smooth surfaces ensure maximum contact, which improves force. Uneven metal weaken the grip.
- Operating temperature – neodymium magnets have a negative temperature coefficient. At higher temperatures they lose power, and at low temperatures gain strength (up to a certain limit).
Lifting capacity was assessed using a smooth steel plate of suitable thickness (min. 20 mm), under vertically applied force, however under attempts to slide the magnet the holding force is lower. In addition, even a slight gap between the magnet and the plate reduces the holding force.
Precautions when working with neodymium magnets
Machining danger
Fire warning: Rare earth powder is explosive. Do not process magnets without safety gear as this risks ignition.
Product not for children
Adult use only. Small elements can be swallowed, leading to severe trauma. Store out of reach of kids and pets.
Warning for allergy sufferers
Certain individuals experience a contact allergy to Ni, which is the common plating for neodymium magnets. Frequent touching can result in skin redness. We recommend wear safety gloves.
Handling rules
Before starting, read the rules. Uncontrolled attraction can destroy the magnet or hurt your hand. Think ahead.
Bodily injuries
Risk of injury: The pulling power is so great that it can result in hematomas, crushing, and even bone fractures. Protective gloves are recommended.
Do not overheat magnets
Watch the temperature. Exposing the magnet above 80 degrees Celsius will ruin its magnetic structure and pulling force.
ICD Warning
Medical warning: Neodymium magnets can turn off pacemakers and defibrillators. Stay away if you have medical devices.
Fragile material
Despite metallic appearance, the material is brittle and not impact-resistant. Do not hit, as the magnet may crumble into hazardous fragments.
Threat to electronics
Powerful magnetic fields can corrupt files on payment cards, hard drives, and storage devices. Keep a distance of at least 10 cm.
Magnetic interference
An intense magnetic field disrupts the functioning of compasses in phones and GPS navigation. Maintain magnets near a device to prevent breaking the sensors.
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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