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UMGGW 66x8.5 [M8] GW / N38 - magnetic holder rubber internal thread
magnetic holder rubber internal thread
Catalog no 160308
GTIN/EAN: 5906301813668
Diameter Ø
66 mm [±1 mm]
Height
8.5 mm [±1 mm]
Weight
100 g
Load capacity
18.40 kg / 180.44 N
23.37 ZŁ with VAT / pcs + price for transport
19.00 ZŁ net + 23% VAT / pcs
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Physical properties - UMGGW 66x8.5 [M8] GW / N38 - magnetic holder rubber internal thread
Specification / characteristics - UMGGW 66x8.5 [M8] GW / N38 - magnetic holder rubber internal thread
| properties | values |
|---|---|
| Cat. no. | 160308 |
| GTIN/EAN | 5906301813668 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter Ø | 66 mm [±1 mm] |
| Height | 8.5 mm [±1 mm] |
| Weight | 100 g |
| Load capacity ~ ? | 18.40 kg / 180.44 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% |
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.
Strengths
- They retain attractive force for almost 10 years – the drop is just ~1% (based on simulations),
- Neodymium magnets prove to be exceptionally resistant to demagnetization caused by external interference,
- The use of an aesthetic layer of noble metals (nickel, gold, silver) causes the element to be more visually attractive,
- Neodymium magnets achieve maximum magnetic induction on a small surface, which allows for strong attraction,
- Through (adequate) combination of ingredients, they can achieve high thermal strength, enabling functioning at temperatures reaching 230°C and above...
- Thanks to freedom in designing and the ability to modify to specific needs,
- Key role in modern industrial fields – they find application in magnetic memories, motor assemblies, medical devices, also technologically advanced constructions.
- Relatively small size with high pulling force – neodymium magnets offer high power in small dimensions, which makes them useful in small systems
Limitations
- At very strong impacts they can crack, therefore we advise placing them in steel cases. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
- Neodymium magnets decrease their force 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
- Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material stable to moisture, when using outdoors
- We recommend casing - magnetic mount, due to difficulties in creating nuts inside the magnet and complicated shapes.
- Possible danger to health – tiny shards of magnets are risky, if swallowed, which becomes key in the context of child health protection. It is also worth noting that small elements of these devices can complicate diagnosis medical after entering the body.
- High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which increases costs of application in large quantities
Pull force analysis
Maximum lifting capacity of the magnet – what contributes to it?
- with the use of a sheet made of low-carbon steel, guaranteeing maximum field concentration
- with a cross-section minimum 10 mm
- with an polished touching surface
- without any clearance between the magnet and steel
- for force acting at a right angle (in the magnet axis)
- at ambient temperature room level
Lifting capacity in real conditions – factors
- Gap between magnet and steel – even a fraction of a millimeter of separation (caused e.g. by varnish or dirt) diminishes the magnet efficiency, often by half at just 0.5 mm.
- Pull-off angle – note that the magnet holds strongest perpendicularly. Under shear forces, the holding force drops drastically, often to levels of 20-30% of the maximum value.
- Wall thickness – the thinner the sheet, the weaker the hold. Magnetic flux penetrates through instead of converting into lifting capacity.
- Metal type – different alloys attracts identically. High carbon content worsen the interaction with the magnet.
- Plate texture – ground elements ensure maximum contact, which improves force. Rough surfaces weaken the grip.
- Thermal environment – heating the magnet results in weakening of induction. It is worth remembering the maximum operating temperature for a given model.
Holding force was tested on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, however under parallel forces the load capacity is reduced by as much as 75%. Moreover, even a minimal clearance between the magnet’s surface and the plate lowers the holding force.
Warnings
Bodily injuries
Large magnets can smash fingers instantly. Do not place your hand between two attracting surfaces.
Product not for children
Absolutely store magnets away from children. Risk of swallowing is significant, and the effects of magnets connecting inside the body are tragic.
Metal Allergy
It is widely known that the nickel plating (standard magnet coating) is a potent allergen. For allergy sufferers, refrain from touching magnets with bare hands or opt for encased magnets.
Handling rules
Be careful. Rare earth magnets act from a distance and connect with huge force, often faster than you can react.
Combustion hazard
Combustion risk: Rare earth powder is explosive. Do not process magnets without safety gear as this may cause fire.
Medical implants
People with a ICD have to maintain an large gap from magnets. The magnetic field can interfere with the functioning of the implant.
Impact on smartphones
Navigation devices and mobile phones are extremely susceptible to magnetic fields. Close proximity with a powerful NdFeB magnet can permanently damage the internal compass in your phone.
Threat to electronics
Data protection: Neodymium magnets can damage payment cards and sensitive devices (pacemakers, medical aids, timepieces).
Risk of cracking
Despite metallic appearance, the material is brittle and not impact-resistant. Avoid impacts, as the magnet may shatter into sharp, dangerous pieces.
Demagnetization risk
Monitor thermal conditions. Heating the magnet above 80 degrees Celsius will destroy its magnetic structure and strength.
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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