UMT 12x20 green / N38 - board holder
board holder
Catalog no 230281
GTIN/EAN: 5906301814337
Diameter Ø
12 mm [±1 mm]
Height
20 mm [±1 mm]
Weight
3.5 g
Coating
[NiCuNi] Nickel
1.894 ZŁ with VAT / pcs + price for transport
1.540 ZŁ net + 23% VAT / pcs
bulk discounts:
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Lifting power along with appearance of neodymium magnets can be analyzed on our
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Technical parameters - UMT 12x20 green / N38 - board holder
Specification / characteristics - UMT 12x20 green / N38 - board holder
| properties | values |
|---|---|
| Cat. no. | 230281 |
| GTIN/EAN | 5906301814337 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter Ø | 12 mm [±1 mm] |
| Height | 20 mm [±1 mm] |
| Weight | 3.5 g |
| 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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Pros as well as cons of rare earth magnets.
Advantages
- They virtually do not lose power, because even after ten years the decline in efficiency is only ~1% (based on calculations),
- They have excellent resistance to weakening of magnetic properties due to opposing magnetic fields,
- Thanks to the elegant finish, the surface of nickel, gold, or silver-plated gives an aesthetic appearance,
- The surface of neodymium magnets generates a powerful magnetic field – this is one of their assets,
- Through (adequate) combination of ingredients, they can achieve high thermal resistance, enabling action at temperatures approaching 230°C and above...
- Possibility of precise shaping as well as modifying to precise requirements,
- Significant place in modern technologies – they are utilized in computer drives, drive modules, diagnostic systems, and complex engineering applications.
- Compactness – despite small sizes they provide effective action, making them ideal for precision applications
Cons
- To avoid cracks upon strong impacts, we recommend using special steel housings. Such a solution protects the magnet and simultaneously increases its durability.
- Neodymium magnets lose their force 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 durability even at temperatures up to 230°C
- Due to the susceptibility of magnets to corrosion in a humid environment, we suggest using waterproof magnets made of rubber, plastic or other material resistant to moisture, in case of application outdoors
- We recommend a housing - magnetic mount, due to difficulties in producing threads inside the magnet and complicated shapes.
- Possible danger resulting from small fragments of magnets are risky, when accidentally swallowed, which is particularly important in the context of child health protection. Additionally, tiny parts of these products are able to complicate diagnosis medical after entering the body.
- With budget limitations the cost of neodymium magnets can be a barrier,
Pull force analysis
Highest magnetic holding force – what it depends on?
- on a plate made of mild steel, perfectly concentrating the magnetic field
- whose transverse dimension is min. 10 mm
- with an ground touching surface
- with zero gap (no coatings)
- for force acting at a right angle (pull-off, not shear)
- in temp. approx. 20°C
Lifting capacity in real conditions – factors
- Gap between surfaces – even a fraction of a millimeter of separation (caused e.g. by veneer or dirt) significantly weakens the pulling force, often by half at just 0.5 mm.
- Force direction – note that the magnet has greatest strength perpendicularly. Under sliding down, the holding force drops drastically, often to levels of 20-30% of the nominal value.
- Plate thickness – insufficiently thick plate does not close the flux, causing part of the flux to be wasted into the air.
- Metal type – different alloys reacts the same. Alloy additives weaken the interaction with the magnet.
- Surface condition – smooth surfaces ensure maximum contact, which increases field saturation. Uneven metal reduce efficiency.
- Temperature influence – high temperature weakens pulling force. Too high temperature can permanently damage the magnet.
Lifting capacity testing was conducted on a smooth plate of optimal thickness, under perpendicular forces, whereas under parallel forces the holding force is lower. Moreover, even a minimal clearance between the magnet and the plate reduces the holding force.
Safety rules for work with neodymium magnets
Combustion hazard
Powder produced during grinding of magnets is self-igniting. Avoid drilling into magnets without proper cooling and knowledge.
Electronic hazard
Avoid bringing magnets close to a wallet, computer, or screen. The magnetism can irreversibly ruin these devices and erase data from cards.
Maximum temperature
Regular neodymium magnets (grade N) lose magnetization when the temperature exceeds 80°C. This process is irreversible.
Implant safety
Individuals with a heart stimulator have to keep an large gap from magnets. The magnetism can interfere with the functioning of the life-saving device.
Fragile material
Despite metallic appearance, the material is delicate and cannot withstand shocks. Do not hit, as the magnet may shatter into sharp, dangerous pieces.
Avoid contact if allergic
It is widely known that the nickel plating (the usual finish) is a potent allergen. If you have an allergy, prevent direct skin contact or select coated magnets.
Handling guide
Before starting, read the rules. Uncontrolled attraction can destroy the magnet or hurt your hand. Be predictive.
Product not for children
Absolutely store magnets out of reach of children. Choking hazard is significant, and the consequences of magnets connecting inside the body are tragic.
Phone sensors
Note: rare earth magnets generate a field that interferes with sensitive sensors. Keep a separation from your phone, device, and GPS.
Hand protection
Risk of injury: The pulling power is so great that it can result in blood blisters, crushing, and even bone fractures. Protective gloves are recommended.
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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