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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
bulk discounts:
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Weight and structure of a neodymium magnet can be tested using our
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Technical - 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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Pros and cons of neodymium magnets.
Strengths
- They retain full power for around 10 years – the drop is just ~1% (based on simulations),
- They are noted for resistance to demagnetization induced by external field influence,
- In other words, due to the metallic layer of gold, the element becomes visually attractive,
- Magnets possess maximum magnetic induction on the working surface,
- Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their shape) at temperatures up to 230°C and above...
- Thanks to versatility in shaping and the capacity to adapt to individual projects,
- Key role in high-tech industry – they are utilized in computer drives, electric motors, medical devices, also industrial machines.
- Thanks to efficiency per cm³, small magnets offer high operating force, occupying minimum space,
Weaknesses
- To avoid cracks upon strong impacts, we recommend using special steel holders. Such a solution protects the magnet and simultaneously improves its durability.
- Neodymium magnets decrease 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
- They oxidize in a humid environment - during use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
- Due to limitations in creating nuts and complex forms in magnets, we recommend using casing - magnetic mechanism.
- Possible danger resulting from small fragments of magnets can be dangerous, if swallowed, which becomes key in the aspect of protecting the youngest. Furthermore, small elements of these magnets are able to complicate diagnosis medical when they are in the body.
- With large orders the cost of neodymium magnets is a challenge,
Holding force characteristics
Breakaway strength of the magnet in ideal conditions – what it depends on?
- using a base made of low-carbon steel, functioning as a magnetic yoke
- possessing a massiveness of minimum 10 mm to ensure full flux closure
- with a surface perfectly flat
- under conditions of ideal adhesion (surface-to-surface)
- for force applied at a right angle (in the magnet axis)
- in neutral thermal conditions
Determinants of practical lifting force of a magnet
- Distance (betwixt the magnet and the plate), since even a tiny clearance (e.g. 0.5 mm) results in a decrease in lifting capacity by up to 50% (this also applies to varnish, rust or debris).
- Direction of force – highest force is obtained only during perpendicular pulling. The shear force of the magnet along the plate is usually many times lower (approx. 1/5 of the lifting capacity).
- Plate thickness – insufficiently thick plate does not accept the full field, causing part of the power to be escaped to the other side.
- Material composition – not every steel attracts identically. Alloy additives weaken the attraction effect.
- Surface quality – the more even the surface, the better the adhesion and higher the lifting capacity. Unevenness acts like micro-gaps.
- Operating temperature – NdFeB sinters have a sensitivity to temperature. At higher temperatures they lose power, and at low temperatures they can be stronger (up to a certain limit).
Lifting capacity was assessed using a smooth steel plate of optimal thickness (min. 20 mm), under perpendicular detachment force, however under attempts to slide the magnet the holding force is lower. Moreover, even a small distance between the magnet’s surface and the plate reduces the lifting capacity.
Safety rules for work with NdFeB magnets
Caution required
Handle magnets with awareness. Their powerful strength can shock even experienced users. Stay alert and respect their force.
Nickel coating and allergies
Warning for allergy sufferers: The nickel-copper-nickel coating consists of nickel. If an allergic reaction occurs, cease working with magnets and use protective gear.
Eye protection
Beware of splinters. Magnets can explode upon uncontrolled impact, ejecting shards into the air. We recommend safety glasses.
Cards and drives
Do not bring magnets close to a wallet, computer, or TV. The magnetic field can destroy these devices and erase data from cards.
Machining danger
Powder created during cutting of magnets is combustible. Do not drill into magnets without proper cooling and knowledge.
GPS Danger
Remember: rare earth magnets generate a field that interferes with sensitive sensors. Keep a separation from your mobile, tablet, and navigation systems.
Serious injuries
Watch your fingers. Two large magnets will join instantly with a force of several hundred kilograms, destroying everything in their path. Be careful!
Permanent damage
Regular neodymium magnets (N-type) lose power when the temperature exceeds 80°C. Damage is permanent.
Swallowing risk
Always keep magnets out of reach of children. Choking hazard is high, and the consequences of magnets clamping inside the body are tragic.
Medical interference
Warning for patients: Powerful magnets disrupt electronics. Keep minimum 30 cm distance or request help to work with the magnets.
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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