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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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Parameters and shape of neodymium magnets can be calculated using our
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Technical data 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 |
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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Advantages as well as disadvantages of rare earth magnets.
Benefits
- They retain magnetic properties for nearly 10 years – the drop is just ~1% (based on simulations),
- Magnets effectively resist against demagnetization caused by ambient magnetic noise,
- The use of an elegant finish of noble metals (nickel, gold, silver) causes the element to be more visually attractive,
- Magnets exhibit maximum magnetic induction on the surface,
- Due to their durability and thermal resistance, neodymium magnets can operate (depending on the form) even at high temperatures reaching 230°C or more...
- Thanks to freedom in constructing and the capacity to customize to client solutions,
- Wide application in future technologies – they are utilized in hard drives, drive modules, advanced medical instruments, also multitasking production systems.
- Compactness – despite small sizes they generate large force, making them ideal for precision applications
Weaknesses
- At strong impacts they can crack, therefore we advise placing them in special holders. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
- Neodymium magnets decrease their strength 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
- 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 prevent oxidation and corrosion.
- We suggest a housing - magnetic holder, due to difficulties in creating threads inside the magnet and complicated shapes.
- Potential hazard resulting from small fragments of magnets are risky, when accidentally swallowed, which becomes key in the context of child safety. It is also worth noting that small components of these devices 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
Pull force analysis
Detachment force of the magnet in optimal conditions – what affects it?
- with the application of a yoke made of low-carbon steel, guaranteeing full magnetic saturation
- possessing a thickness of min. 10 mm to ensure full flux closure
- with a surface cleaned and smooth
- without any air gap between the magnet and steel
- for force applied at a right angle (pull-off, not shear)
- in neutral thermal conditions
What influences lifting capacity in practice
- Clearance – existence of foreign body (rust, dirt, air) acts as an insulator, which reduces capacity steeply (even by 50% at 0.5 mm).
- Force direction – catalog parameter refers to detachment vertically. When slipping, the magnet holds much less (typically approx. 20-30% of nominal force).
- Steel thickness – insufficiently thick sheet does not close the flux, causing part of the power to be escaped to the other side.
- Steel grade – the best choice is high-permeability steel. Stainless steels may attract less.
- Surface structure – the more even the plate, the larger the contact zone and stronger the hold. Unevenness acts like micro-gaps.
- Heat – neodymium magnets have a negative temperature coefficient. At higher temperatures they are weaker, and in frost they can be stronger (up to a certain limit).
Lifting capacity testing was performed on a smooth plate of optimal thickness, under a perpendicular pulling force, whereas under attempts to slide the magnet the lifting capacity is smaller. In addition, even a minimal clearance between the magnet’s surface and the plate decreases the lifting capacity.
Precautions when working with neodymium magnets
Heat warning
Watch the temperature. Heating the magnet to high heat will ruin its magnetic structure and strength.
Eye protection
Beware of splinters. Magnets can explode upon uncontrolled impact, launching shards into the air. Wear goggles.
Nickel coating and allergies
Some people suffer from a sensitization to Ni, which is the common plating for NdFeB magnets. Extended handling can result in dermatitis. We recommend wear safety gloves.
Do not drill into magnets
Powder generated during grinding of magnets is flammable. Avoid drilling into magnets unless you are an expert.
Magnetic interference
Navigation devices and mobile phones are extremely sensitive to magnetic fields. Close proximity with a powerful NdFeB magnet can decalibrate the internal compass in your phone.
Finger safety
Big blocks can crush fingers instantly. Do not put your hand between two attracting surfaces.
Swallowing risk
Strictly keep magnets away from children. Ingestion danger is significant, and the effects of magnets connecting inside the body are very dangerous.
Handling rules
Handle with care. Neodymium magnets attract from a long distance and connect with massive power, often quicker than you can move away.
Medical interference
Medical warning: Strong magnets can turn off heart devices and defibrillators. Stay away if you have medical devices.
Safe distance
Avoid bringing magnets near a purse, laptop, or screen. The magnetic field can irreversibly ruin these devices and wipe information from cards.
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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