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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
bulk discounts:
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Technical parameters - 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 rare earth magnets.
Pros
- They do not lose magnetism, even over nearly 10 years – the drop in power is only ~1% (based on measurements),
- They feature excellent resistance to weakening of magnetic properties when exposed to opposing magnetic fields,
- A magnet with a smooth silver surface is more attractive,
- Magnets are distinguished by excellent magnetic induction on the outer layer,
- Thanks to resistance to high temperature, they can operate (depending on the shape) even at temperatures up to 230°C and higher...
- Thanks to the possibility of precise shaping and adaptation to unique projects, neodymium magnets can be modeled in a broad palette of geometric configurations, which expands the range of possible applications,
- Wide application in advanced technology sectors – they are used in hard drives, drive modules, precision medical tools, also technologically advanced constructions.
- Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in compact dimensions, which makes them useful in small systems
Disadvantages
- 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 stability even at temperatures up to 230°C
- When exposed to humidity, magnets start to 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 casing - magnetic holder, due to difficulties in creating nuts inside the magnet and complicated shapes.
- Health risk to health – tiny shards of magnets can be dangerous, when accidentally swallowed, which gains importance in the context of child health protection. Furthermore, tiny parts of these magnets can disrupt the diagnostic process medical when they are in the body.
- Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications
Holding force characteristics
Best holding force of the magnet in ideal parameters – what contributes to it?
- on a base made of structural steel, perfectly concentrating the magnetic flux
- with a cross-section of at least 10 mm
- with an ideally smooth contact surface
- with direct contact (without paint)
- during pulling in a direction perpendicular to the plane
- at conditions approx. 20°C
Determinants of practical lifting force of a magnet
- Gap (betwixt the magnet and the metal), as even a very small clearance (e.g. 0.5 mm) leads to a reduction in force by up to 50% (this also applies to paint, rust or debris).
- Loading method – catalog parameter refers to pulling vertically. When applying parallel force, the magnet holds significantly lower power (often approx. 20-30% of nominal force).
- Steel thickness – insufficiently thick plate does not close the flux, causing part of the flux to be wasted to the other side.
- Chemical composition of the base – low-carbon steel gives the best results. Alloy steels lower magnetic properties and lifting capacity.
- Surface finish – ideal contact is possible only on polished steel. Any scratches and bumps create air cushions, weakening the magnet.
- Thermal environment – temperature increase results in weakening of induction. It is worth remembering the maximum operating temperature for a given model.
Holding force was measured on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, whereas under parallel forces the lifting capacity is smaller. Moreover, even a small distance between the magnet and the plate decreases the load capacity.
Warnings
Keep away from children
Neodymium magnets are not suitable for play. Accidental ingestion of multiple magnets may result in them pinching intestinal walls, which constitutes a direct threat to life and necessitates immediate surgery.
Compass and GPS
Be aware: rare earth magnets produce a field that confuses sensitive sensors. Maintain a separation from your mobile, tablet, and navigation systems.
Data carriers
Data protection: Strong magnets can ruin payment cards and sensitive devices (pacemakers, hearing aids, mechanical watches).
Warning for heart patients
Health Alert: Strong magnets can turn off heart devices and defibrillators. Stay away if you have medical devices.
Fragile material
NdFeB magnets are ceramic materials, meaning they are prone to chipping. Clashing of two magnets leads to them breaking into small pieces.
Heat warning
Regular neodymium magnets (grade N) lose power when the temperature surpasses 80°C. This process is irreversible.
Avoid contact if allergic
Warning for allergy sufferers: The nickel-copper-nickel coating contains nickel. If an allergic reaction happens, cease handling magnets and use protective gear.
Crushing force
Protect your hands. Two large magnets will snap together immediately with a force of several hundred kilograms, crushing anything in their path. Exercise extreme caution!
Fire warning
Fire hazard: Neodymium dust is explosive. Do not process magnets without safety gear as this risks ignition.
Handling guide
Before use, read the rules. Sudden snapping can break the magnet or hurt your hand. Think ahead.
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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