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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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Lifting power along with shape of a neodymium magnet can be tested with our
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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 | T |
| 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 106 | °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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Advantages as well as disadvantages of Nd2Fe14B magnets.
Benefits
- Their power remains stable, and after approximately 10 years it decreases only by ~1% (theoretically),
- Neodymium magnets remain highly resistant to demagnetization caused by magnetic disturbances,
- The use of an aesthetic finish of noble metals (nickel, gold, silver) causes the element to have aesthetics,
- They show high magnetic induction at the operating surface, which improves attraction properties,
- Due to their durability and thermal resistance, neodymium magnets can operate (depending on the form) even at high temperatures reaching 230°C or more...
- Due to the potential of precise forming and customization to custom requirements, NdFeB magnets can be created in a broad palette of shapes and sizes, which expands the range of possible applications,
- Versatile presence in future technologies – they find application in HDD drives, electromotive mechanisms, precision medical tools, as well as industrial machines.
- Thanks to efficiency per cm³, small magnets offer high operating force, with minimal size,
Cons
- At strong impacts they can crack, therefore we advise placing them in steel cases. A metal housing provides additional protection against damage and increases the magnet's durability.
- When exposed to high temperature, neodymium magnets experience a drop in power. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size and shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
- Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material immune to moisture, in case of application outdoors
- Due to limitations in realizing nuts and complicated shapes in magnets, we recommend using casing - magnetic mount.
- Potential hazard resulting from small fragments of magnets are risky, if swallowed, which gains importance in the aspect of protecting the youngest. It is also worth noting that small elements of these devices are able to disrupt the diagnostic process medical when they are in the body.
- High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which hinders application in large quantities
Holding force characteristics
Maximum magnetic pulling force – what affects it?
- with the application of a sheet made of low-carbon steel, ensuring full magnetic saturation
- possessing a thickness of at least 10 mm to ensure full flux closure
- characterized by smoothness
- without any clearance between the magnet and steel
- under perpendicular force direction (90-degree angle)
- at room temperature
Lifting capacity in real conditions – factors
- Gap between surfaces – every millimeter of distance (caused e.g. by veneer or unevenness) significantly weakens the pulling force, often by half at just 0.5 mm.
- Angle of force application – maximum parameter is available only during pulling at a 90° angle. The force required to slide of the magnet along the plate is standardly several times lower (approx. 1/5 of the lifting capacity).
- Element thickness – to utilize 100% power, the steel must be adequately massive. Thin sheet limits the attraction force (the magnet "punches through" it).
- Plate material – low-carbon steel gives the best results. Alloy admixtures lower magnetic permeability and lifting capacity.
- Surface condition – ground elements ensure maximum contact, which improves force. Rough surfaces weaken the grip.
- Thermal conditions – neodymium magnets have a sensitivity to temperature. When it is hot they lose power, and at low temperatures they can be stronger (up to a certain limit).
Lifting capacity was measured using a steel plate with a smooth surface of suitable thickness (min. 20 mm), under perpendicular pulling force, in contrast under attempts to slide the magnet the load capacity is reduced by as much as fivefold. Additionally, even a slight gap between the magnet and the plate decreases the holding force.
Do not give to children
NdFeB magnets are not suitable for play. Accidental ingestion of a few magnets may result in them attracting across intestines, which poses a severe health hazard and requires urgent medical intervention.
Phone sensors
GPS units and smartphones are extremely sensitive to magnetism. Direct contact with a strong magnet can permanently damage the sensors in your phone.
Handling guide
Handle magnets with awareness. Their immense force can shock even professionals. Be vigilant and do not underestimate their force.
Sensitization to coating
Studies show that nickel (the usual finish) is a common allergen. For allergy sufferers, avoid touching magnets with bare hands or choose versions in plastic housing.
Demagnetization risk
Keep cool. NdFeB magnets are sensitive to temperature. If you require resistance above 80°C, ask us about HT versions (H, SH, UH).
Combustion hazard
Dust generated during grinding of magnets is self-igniting. Do not drill into magnets without proper cooling and knowledge.
Eye protection
NdFeB magnets are ceramic materials, which means they are prone to chipping. Clashing of two magnets leads to them shattering into small pieces.
Magnetic media
Powerful magnetic fields can destroy records on payment cards, hard drives, and storage devices. Keep a distance of min. 10 cm.
Crushing risk
Danger of trauma: The pulling power is so immense that it can cause hematomas, crushing, and broken bones. Protective gloves are recommended.
Life threat
Life threat: Strong magnets can deactivate pacemakers and defibrillators. Do not approach if you have medical devices.
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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