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UMGW 20x15x7 [M4] GW / N38 - magnetic holder internal thread
magnetic holder internal thread
Catalog no 180316
GTIN/EAN: 5906301813729
Diameter Ø
20 mm [±1 mm]
Height
15 mm [±1 mm]
Height
7 mm [±1 mm]
Weight
15.5 g
Load capacity
9.00 kg / 88.26 N
6.49 ZŁ with VAT / pcs + price for transport
5.28 ZŁ net + 23% VAT / pcs
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Technical of the product - UMGW 20x15x7 [M4] GW / N38 - magnetic holder internal thread
Specification / characteristics - UMGW 20x15x7 [M4] GW / N38 - magnetic holder internal thread
| properties | values |
|---|---|
| Cat. no. | 180316 |
| GTIN/EAN | 5906301813729 |
| 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 | 15.5 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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Advantages as well as disadvantages of neodymium magnets.
Pros
- They do not lose power, even after around ten years – the reduction in lifting capacity is only ~1% (according to tests),
- Neodymium magnets prove to be remarkably resistant to loss of magnetic properties caused by external field sources,
- The use of an shiny coating of noble metals (nickel, gold, silver) causes the element to have aesthetics,
- They are known for high magnetic induction at the operating surface, making them more effective,
- Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and can function (depending on the shape) even at a temperature of 230°C or more...
- Thanks to the ability of precise shaping and adaptation to unique requirements, magnetic components can be manufactured in a broad palette of shapes and sizes, which amplifies use scope,
- Versatile presence in future technologies – they are used in computer drives, electric drive systems, diagnostic systems, and industrial machines.
- Thanks to their power density, small magnets offer high operating force, in miniature format,
Limitations
- To avoid cracks under impact, we recommend using special steel housings. Such a solution secures the magnet and simultaneously improves 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 power. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures up to 230°C
- They rust in a humid environment. For use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
- Due to limitations in creating threads and complicated shapes in magnets, we recommend using a housing - magnetic mechanism.
- Potential hazard related to microscopic parts of magnets pose a threat, in case of ingestion, which is particularly important 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 when they are in the body.
- High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which hinders application in large quantities
Pull force analysis
Optimal lifting capacity of a neodymium magnet – what it depends on?
- with the use of a sheet made of low-carbon steel, guaranteeing full magnetic saturation
- possessing a massiveness of at least 10 mm to ensure full flux closure
- with a surface cleaned and smooth
- without the slightest insulating layer between the magnet and steel
- under vertical force vector (90-degree angle)
- at standard ambient temperature
Lifting capacity in real conditions – factors
- Space between magnet and steel – every millimeter of separation (caused e.g. by veneer or unevenness) drastically reduces the magnet efficiency, often by half at just 0.5 mm.
- Pull-off angle – remember that the magnet has greatest strength perpendicularly. Under shear forces, the holding force drops drastically, often to levels of 20-30% of the nominal value.
- Metal thickness – the thinner the sheet, the weaker the hold. Magnetic flux passes through the material instead of converting into lifting capacity.
- Steel grade – the best choice is pure iron steel. Stainless steels may have worse magnetic properties.
- Surface finish – full contact is possible only on polished steel. Any scratches and bumps reduce the real contact area, reducing force.
- Thermal factor – hot environment weakens pulling force. Exceeding the limit temperature can permanently damage the magnet.
Lifting capacity testing was performed on a smooth plate of optimal thickness, under a perpendicular pulling force, in contrast under shearing force the load capacity is reduced by as much as fivefold. In addition, even a slight gap between the magnet’s surface and the plate decreases the load capacity.
Safety rules for work with neodymium magnets
Precision electronics
A powerful magnetic field negatively affects the operation of magnetometers in smartphones and navigation systems. Do not bring magnets close to a device to prevent damaging the sensors.
Do not underestimate power
Before use, check safety instructions. Sudden snapping can destroy the magnet or hurt your hand. Think ahead.
Beware of splinters
Despite the nickel coating, the material is brittle and not impact-resistant. Avoid impacts, as the magnet may shatter into sharp, dangerous pieces.
Bodily injuries
Large magnets can smash fingers in a fraction of a second. Under no circumstances place your hand between two strong magnets.
Threat to electronics
Powerful magnetic fields can destroy records on payment cards, hard drives, and storage devices. Stay away of at least 10 cm.
Machining danger
Machining of neodymium magnets poses a fire hazard. Neodymium dust reacts violently with oxygen and is difficult to extinguish.
Product not for children
Only for adults. Tiny parts pose a choking risk, leading to severe trauma. Keep out of reach of children and animals.
Metal Allergy
Warning for allergy sufferers: The nickel-copper-nickel coating contains nickel. If skin irritation happens, immediately stop working with magnets and use protective gear.
Thermal limits
Standard neodymium magnets (N-type) lose magnetization when the temperature exceeds 80°C. This process is irreversible.
Medical implants
Patients with a heart stimulator have to maintain an large gap from magnets. The magnetic field can stop the operation of the implant.
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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