UMT 20x25 black / N38 - board holder
board holder
Catalog no 230263
GTIN/EAN: 5906301814269
Diameter Ø
20 mm [±1 mm]
Height
25 mm [±1 mm]
Weight
7 g
Coating
[NiCuNi] Nickel
3.49 ZŁ with VAT / pcs + price for transport
2.84 ZŁ net + 23% VAT / pcs
bulk discounts:
Need more?
Call us now
+48 22 499 98 98
alternatively contact us by means of
inquiry form
the contact page.
Specifications and structure of magnets can be analyzed with our
force calculator.
Order by 14:00 and we’ll ship today!
Detailed specification - UMT 20x25 black / N38 - board holder
Specification / characteristics - UMT 20x25 black / N38 - board holder
| properties | values |
|---|---|
| Cat. no. | 230263 |
| GTIN/EAN | 5906301814269 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter Ø | 20 mm [±1 mm] |
| Height | 25 mm [±1 mm] |
| Weight | 7 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 |
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% |
Sustainability
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
Other proposals
![UMH 42x9x46 [M6] / N38 - magnetic holder with hook](https://cdn3.dhit.pl/graphics/products/umh-42x9x46-m6-vat.jpg "UMH 42x9x46 [M6] / N38 - magnetic holder with hook")
![AM ucho [M12] - magnetic accessories](https://cdn3.dhit.pl/graphics/products/am-ucho-m12-maz.jpg "AM ucho [M12] - magnetic accessories")
Pros and cons of neodymium magnets.
Advantages
- They do not lose strength, even over approximately 10 years – the decrease in strength is only ~1% (theoretically),
- They have excellent resistance to magnetism drop when exposed to external magnetic sources,
- In other words, due to the smooth layer of silver, the element becomes visually attractive,
- Magnetic induction on the top side of the magnet turns out to be impressive,
- Neodymium magnets are characterized by very high magnetic induction on the magnet surface and are able to act (depending on the form) even at a temperature of 230°C or more...
- Thanks to the ability of accurate molding and adaptation to custom requirements, magnetic components can be created in a variety of geometric configurations, which amplifies use scope,
- Fundamental importance in high-tech industry – they find application in hard drives, electric drive systems, medical equipment, also multitasking production systems.
- Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in compact dimensions, which allows their use in compact constructions
Disadvantages
- They are fragile upon too strong impacts. To avoid cracks, it is worth protecting magnets using a steel holder. Such protection not only shields the magnet but also increases its resistance to damage
- We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
- When exposed to humidity, magnets usually rust. To use them in conditions outside, it is recommended to use protective magnets, such as those in rubber or plastics, which secure oxidation as well as corrosion.
- We recommend a housing - magnetic mechanism, due to difficulties in producing threads inside the magnet and complicated shapes.
- Potential hazard resulting from small fragments of magnets are risky, if swallowed, which is particularly important in the context of child safety. Furthermore, 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 increases costs of application in large quantities
Holding force characteristics
Maximum lifting force for a neodymium magnet – what affects it?
- with the contact of a yoke made of low-carbon steel, ensuring full magnetic saturation
- possessing a thickness of min. 10 mm to avoid saturation
- with an polished contact surface
- without the slightest insulating layer between the magnet and steel
- for force acting at a right angle (pull-off, not shear)
- at conditions approx. 20°C
Lifting capacity in real conditions – factors
- Distance (betwixt the magnet and the plate), as even a microscopic clearance (e.g. 0.5 mm) can cause a reduction in force by up to 50% (this also applies to paint, corrosion or debris).
- Force direction – catalog parameter refers to pulling vertically. When slipping, the magnet exhibits much less (typically approx. 20-30% of nominal force).
- Wall thickness – thin material does not allow full use of the magnet. Magnetic flux passes through the material instead of generating force.
- Material composition – different alloys reacts the same. Alloy additives weaken the interaction with the magnet.
- Surface quality – the more even the surface, the better the adhesion and higher the lifting capacity. Unevenness creates an air distance.
- Thermal factor – high temperature reduces pulling force. Exceeding the limit temperature can permanently demagnetize the magnet.
Lifting capacity testing was conducted on plates with a smooth surface of suitable thickness, under perpendicular forces, whereas under parallel forces the holding force is lower. Additionally, even a slight gap between the magnet and the plate reduces the lifting capacity.
Precautions when working with neodymium magnets
Machining danger
Powder created during machining of magnets is self-igniting. Avoid drilling into magnets unless you are an expert.
Compass and GPS
A strong magnetic field negatively affects the functioning of magnetometers in smartphones and navigation systems. Keep magnets near a device to avoid breaking the sensors.
Handling guide
Handle with care. Neodymium magnets act from a long distance and connect with huge force, often quicker than you can react.
Nickel coating and allergies
Studies show that nickel (standard magnet coating) is a strong allergen. If you have an allergy, refrain from touching magnets with bare hands or choose encased magnets.
Bodily injuries
Big blocks can break fingers in a fraction of a second. Do not put your hand betwixt two strong magnets.
Life threat
Patients with a pacemaker should keep an absolute distance from magnets. The magnetic field can disrupt the functioning of the life-saving device.
Shattering risk
Beware of splinters. Magnets can fracture upon violent connection, ejecting sharp fragments into the air. Wear goggles.
Operating temperature
Standard neodymium magnets (grade N) lose power when the temperature surpasses 80°C. The loss of strength is permanent.
Safe distance
Avoid bringing magnets close to a wallet, laptop, or screen. The magnetic field can irreversibly ruin these devices and erase data from cards.
Product not for children
Adult use only. Small elements can be swallowed, leading to severe trauma. Keep away from kids and pets.
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
Rate the product
Your rating