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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
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Product card - 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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Strengths and weaknesses of Nd2Fe14B magnets.
Advantages
- They retain magnetic properties for almost 10 years – the loss is just ~1% (in theory),
- They maintain their magnetic properties even under strong external field,
- Thanks to the shiny finish, the plating of nickel, gold, or silver-plated gives an aesthetic appearance,
- Magnetic induction on the top side of the magnet is impressive,
- Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and can function (depending on the form) even at a temperature of 230°C or more...
- Possibility of accurate shaping and optimizing to individual conditions,
- Significant place in electronics industry – they are commonly used in data components, electric drive systems, diagnostic systems, and modern systems.
- Thanks to concentrated force, small magnets offer high operating force, occupying minimum space,
Disadvantages
- To avoid cracks under impact, we suggest using special steel housings. Such a solution secures the magnet and simultaneously increases its durability.
- NdFeB magnets lose power when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of strength (a factor is the shape as well as 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 suggest using waterproof magnets e.g. in rubber, plastic
- Due to limitations in creating nuts and complex shapes in magnets, we propose using casing - magnetic holder.
- Potential hazard to health – tiny shards of magnets can be dangerous, in case of ingestion, which becomes key in the aspect of protecting the youngest. Furthermore, small components of these devices can complicate diagnosis medical after entering the body.
- Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications
Pull force analysis
Breakaway strength of the magnet in ideal conditions – what it depends on?
- on a base made of mild steel, effectively closing the magnetic field
- possessing a massiveness of minimum 10 mm to ensure full flux closure
- characterized by even structure
- with direct contact (no coatings)
- under vertical force direction (90-degree angle)
- in temp. approx. 20°C
Impact of factors on magnetic holding capacity in practice
- Gap (betwixt the magnet and the plate), as even a microscopic distance (e.g. 0.5 mm) results in a drastic drop in lifting capacity by up to 50% (this also applies to varnish, rust or debris).
- Angle of force application – maximum parameter is reached only during pulling at a 90° angle. The shear force of the magnet along the plate is typically many times lower (approx. 1/5 of the lifting capacity).
- Base massiveness – insufficiently thick steel does not accept the full field, causing part of the power to be lost into the air.
- Material type – ideal substrate is pure iron steel. Hardened steels may have worse magnetic properties.
- Smoothness – ideal contact is obtained only on smooth steel. Rough texture create air cushions, reducing force.
- Temperature influence – hot environment weakens pulling force. Exceeding the limit temperature can permanently damage the magnet.
Lifting capacity testing was carried out on plates with a smooth surface of optimal thickness, under a perpendicular pulling force, whereas under attempts to slide the magnet the load capacity is reduced by as much as 5 times. Additionally, even a slight gap between the magnet’s surface and the plate lowers the lifting capacity.
H&S for magnets
Operating temperature
Standard neodymium magnets (grade N) lose magnetization when the temperature surpasses 80°C. The loss of strength is permanent.
Precision electronics
Note: neodymium magnets generate a field that disrupts precision electronics. Keep a safe distance from your phone, tablet, and navigation systems.
Magnetic media
Data protection: Neodymium magnets can ruin payment cards and sensitive devices (pacemakers, medical aids, timepieces).
Metal Allergy
It is widely known that the nickel plating (standard magnet coating) is a strong allergen. For allergy sufferers, prevent direct skin contact or opt for versions in plastic housing.
Combustion hazard
Powder generated during machining of magnets is self-igniting. Avoid drilling into magnets without proper cooling and knowledge.
Hand protection
Mind your fingers. Two powerful magnets will snap together instantly with a force of several hundred kilograms, crushing anything in their path. Exercise extreme caution!
No play value
Absolutely store magnets away from children. Risk of swallowing is significant, and the effects of magnets connecting inside the body are life-threatening.
Respect the power
Use magnets with awareness. Their powerful strength can shock even professionals. Stay alert and do not underestimate their force.
Health Danger
Life threat: Strong magnets can turn off pacemakers and defibrillators. Do not approach if you have electronic implants.
Shattering risk
NdFeB magnets are sintered ceramics, which means they are fragile like glass. Collision of two magnets will cause them breaking into shards.
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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