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UMGZ 20x15x7 [M4] GZ / N38 - magnetic holder external thread
magnetic holder external thread
Catalog no 190322
GTIN/EAN: 5906301813811
Diameter Ø
20 mm [±1 mm]
Height
15 mm [±1 mm]
Height
7 mm [±1 mm]
Weight
14 g
Load capacity
9.00 kg / 88.26 N
7.22 ZŁ with VAT / pcs + price for transport
5.87 ZŁ net + 23% VAT / pcs
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Technical details - UMGZ 20x15x7 [M4] GZ / N38 - magnetic holder external thread
Specification / characteristics - UMGZ 20x15x7 [M4] GZ / N38 - magnetic holder external thread
| properties | values |
|---|---|
| Cat. no. | 190322 |
| GTIN/EAN | 5906301813811 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter Ø | 20 mm [±1 mm] |
| Height | 15 mm [±1 mm] |
| Height | 7 mm [±1 mm] |
| Weight | 14 g |
| Load capacity ~ ? | 9.00 kg / 88.26 N |
| 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 have unchanged lifting capacity, and over nearly 10 years their attraction force decreases symbolically – ~1% (according to theory),
- They do not lose their magnetic properties even under close interference source,
- The use of an shiny coating of noble metals (nickel, gold, silver) causes the element to be more visually attractive,
- The surface of neodymium magnets generates a unique magnetic field – this is one of their assets,
- Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
- Thanks to flexibility in constructing and the capacity to modify to unusual requirements,
- Significant place in future technologies – they serve a role in magnetic memories, electric motors, medical devices, also complex engineering applications.
- Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications
Weaknesses
- To avoid cracks under impact, we recommend using special steel holders. Such a solution protects the magnet and simultaneously improves its durability.
- NdFeB magnets lose strength when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop 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 extremely resistant to heat
- When exposed to humidity, magnets start to rust. For applications outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which secure oxidation and corrosion.
- Due to limitations in realizing nuts and complicated forms in magnets, we propose using casing - magnetic holder.
- Health risk related to microscopic parts of magnets pose a threat, when accidentally swallowed, which becomes key in the aspect of protecting the youngest. It is also worth noting that small elements of these products are able to be problematic in diagnostics medical in case of swallowing.
- Due to complex production process, their price is relatively high,
Pull force analysis
Detachment force of the magnet in optimal conditions – what contributes to it?
- with the application of a yoke made of special test steel, guaranteeing full magnetic saturation
- with a thickness of at least 10 mm
- with a plane cleaned and smooth
- without any air gap between the magnet and steel
- during pulling in a direction perpendicular to the mounting surface
- in stable room temperature
Determinants of lifting force in real conditions
- Space between surfaces – every millimeter of separation (caused e.g. by veneer or unevenness) significantly weakens the magnet efficiency, often by half at just 0.5 mm.
- Force direction – remember that the magnet has greatest strength perpendicularly. Under sliding down, the capacity drops drastically, often to levels of 20-30% of the maximum value.
- Steel thickness – too thin steel causes magnetic saturation, causing part of the flux to be wasted to the other side.
- Material composition – different alloys attracts identically. High carbon content weaken the interaction with the magnet.
- Surface quality – the more even the surface, the better the adhesion and stronger the hold. Unevenness creates an air distance.
- Operating temperature – neodymium magnets have a negative temperature coefficient. When it is hot they lose power, and at low temperatures gain strength (up to a certain limit).
Lifting capacity testing was performed on plates with a smooth surface of suitable thickness, under perpendicular forces, in contrast under shearing force 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.
Precautions when working with neodymium magnets
Magnetic media
Intense magnetic fields can corrupt files on payment cards, hard drives, and other magnetic media. Stay away of min. 10 cm.
Medical interference
Medical warning: Neodymium magnets can deactivate pacemakers and defibrillators. Stay away if you have medical devices.
Adults only
Adult use only. Tiny parts pose a choking risk, leading to serious injuries. Keep out of reach of kids and pets.
Physical harm
Big blocks can crush fingers in a fraction of a second. Under no circumstances place your hand between two attracting surfaces.
Shattering risk
Despite metallic appearance, neodymium is delicate and cannot withstand shocks. Avoid impacts, as the magnet may crumble into hazardous fragments.
Phone sensors
A powerful magnetic field disrupts the functioning of compasses in smartphones and GPS navigation. Maintain magnets near a device to avoid damaging the sensors.
Caution required
Before use, check safety instructions. Uncontrolled attraction can destroy the magnet or injure your hand. Think ahead.
Allergy Warning
A percentage of the population have a contact allergy to Ni, which is the standard coating for NdFeB magnets. Extended handling might lead to skin redness. We suggest use protective gloves.
Dust explosion hazard
Dust created during cutting of magnets is flammable. Avoid drilling into magnets unless you are an expert.
Heat sensitivity
Regular neodymium magnets (grade N) lose power when the temperature surpasses 80°C. Damage is permanent.
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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